Null


454 breaking pistons

  • 51 Replies
  • 9284 Views

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« on: June 13, 2015, 07:13:30 PM »
Need some help. 3rd engine same consequences. Gen v blocks (different blocks and stock bottom ends) same heads 049's. Had the heads checked and they were good. My problem is that the pistons skirts keep getting ripped out. I wasted my last block. Rebuilt this one last year but didn't get a chance to get it out. I did break it in for over an hour on the trailer, fluctuating rpm ' s and temp was at around 180-200. Reused cam as it checked out. Got the boat out today and ran fine for the first 30 min. We floated and went to get some more run time but it started knocking. Engine oil pressure always starts at around 45-50 psi but drops to 10 at idle when hot. My theory is that the cylinder walls are staying cold and the pistons expands thus the cylinder grabbing the piston. Third motor, last two did the same thing, broke piston skirts and left the head of the piston at the top. Always just honed out the cylinder and re-ringed stock pistons. It only knocks when in the water around 3500, never went above 4g's. Idled immediately to the trailer. Out of the water sounds fine. I don't get it. Oil has some metal in it but it is still clean and seems like a normal amount of break in debris. Installed a water pressure guage since the last one and it never made it past 10 psi. So are my cylinder walls staying too cold? Not running a thermostat, tee'd to motor then I have the normal header check valve at one output and the other goes straight out the he transom. Header mist comes on at 1850 rpm. No water in oil. Also, should I tear this engine apart now since it knocks under load? Timing is set at 10 degrees idle, running a Mallory unite setup and running 87 octane with a demon 850. Plugs look exactly as they should. Useless info, berk c bowl, stock in a challenger hull.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."


1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #1 on: June 13, 2015, 07:22:51 PM »
Also, I ran the first 454 with a vacuum secondary 750 for two years. Switched to demon and shit went down hill. I don't understand how the carb swap would cause this though.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

86caribbean

  • Join Date: Oct 2013
  • Location: Ontario Ca.
  • *
  • Sr. Member
  • ****
  • Posts: 258
  • Karma: +11/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 15
« Reply #2 on: June 13, 2015, 07:44:53 PM »
What are the piston to wall and rod and main oil clearances?...With a boat engine you definitely have to loosen things up a bit. Sounds like you have some sort of mechanical problem downstairs. I run piston to wall .006-.0065 and rods .003-.0032 and mains .003-.0035. Make sure the oil pump pick up isnít too close or too far away from the bottom of the pan. You say this is the third engine with these issues; you are missing something very important in the short block assembly. Sorry to hear of these problems, but unfortunately yes you have to tear down this engine and inspect everything and find the route cause of this problem. Iím thinking since this has happened before, it may have something to do with a part or a combo that just keeps getting transferred to the new engine, find out what. As for switching from a Holley to the demon, that is a separate issue, Iím my opinion, Iíd ditch the Demon and stick with just a Holley, I have seen Holleyís always make more power on the dynoís. Iíll speak to a good friend of mine that is another high performance engine builder and a boat fan about your problem; Iíll post something if he opens up any other possibilities. 
  • Boat #1: 1986 18' Caribbean

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #3 on: June 13, 2015, 08:21:10 PM »
Need some help. 3rd engine same consequences. Gen v blocks (different blocks and stock bottom ends) same heads 049's. Had the heads checked and they were good. My problem is that the pistons skirts keep getting ripped out.

Are you using the correct head gasket? The 049 is not a bolt and go on the gen V block.


I wasted my last block. Rebuilt this one last year but didn't get a chance to get it out. I did break it in for over an hour on the trailer, fluctuating rpm ' s and temp was at around 180-200. Reused cam as it checked out.

Why so damn hot?


Got the boat out today and ran fine for the first 30 min. We floated and went to get some more run time but it started knocking. Engine oil pressure always starts at around 45-50 psi but drops to 10 at idle when hot. My theory is that the cylinder walls are staying cold and the pistons expands thus the cylinder grabbing the piston.

What pistons? How was the block machined?


Third motor, last two did the same thing, broke piston skirts and left the head of the piston at the top. Always just honed out the cylinder and re-ringed stock pistons. It only knocks when in the water around 3500, never went above 4g's. Idled immediately to the trailer.

I think I'm missing a piece of something or other...

Out of the water sounds fine. I don't get it. Oil has some metal in it but it is still clean and seems like a normal amount of break in debris. Installed a water pressure guage since the last one and it never made it past 10 psi.


Too low IMHO

So are my cylinder walls staying too cold? Not running a thermostat, tee'd to motor then I have the normal header check valve at one output and the other goes straight out the he transom.

What is the inside diameter of the dump fitting?
Do you have a valve of some sort off the ump?

Header mist comes on at 1850 rpm. No water in oil. Also, should I tear this engine apart now since it knocks under load? Timing is set at 10 degrees idle, running a Mallory unite setup and running 87 octane with a demon 850. Plugs look exactly as they should. Useless info, berk c bowl, stock in a challenger hull.

Timing at idle is as irrelevant as the penis size of a tranny... What is it at 2,500? What do you have for a distributor?

Something is fundamentally wrong. Is 87 AKI the highest octane you can get in your area? Should be running 91 if available.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #4 on: June 13, 2015, 08:22:38 PM »
Also, I ran the first 454 with a vacuum secondary 750 for two years. Switched to demon and shit went down hill. I don't understand how the carb swap would cause this though.

Sent from my SM-G900T using SoCal Jet Boats mobile app

If its running lean it can heat things up to the point where they expand too much causing a hot seize. Do you have pictures of any old parts?

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #5 on: June 13, 2015, 08:40:06 PM »
@ 86 Caribbean rod and main clearances were all around 3 thousandths. Never measured pistons as I put em in the same holes they came out but the cylinders measure 1 thousandth or less than stock after hone. I want to get rid of the demon. I may have it checked out to see wth is going on.

@gt, yes I know the heads don't just bolt on since the gen v cooling holes were enlarged. Felpro made a gasket (can't remember number off the top of my head) that is supposed to help this issue.

200 is not that hot but I tried to keep it around 180 on the trailer.

Stock pistons and no the block was not machined. Re-ringed and new bearings.

Agree that the oil pressure is too low. However, not low enough to cause damage. I work on diesels that have a by the book min of 5 psi. Not what I want though.

I do have a valve off the dump but it's wide open.  I didn't want to build pressure in the block especially with the 049/gen 5 combo. I know about the timing but I didn't get a chance to do it under load.

I don't want to run 91 basically for the $$$. Plus stock bottom ended 454 should have zero issues with this. Plus 3 points in the octane rating on a 9:1 engine is minimal at best.

I'll try to get pics of the old parts.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #6 on: June 13, 2015, 08:42:42 PM »
1

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #7 on: June 13, 2015, 08:46:17 PM »
2

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #8 on: June 13, 2015, 08:53:04 PM »
I apologize in advance, but putting on the dick hat....  :sly:


@ 86 Caribbean rod and main clearances were all around 3 thousandths. Never measured pistons as I put em in the same holes they came out but the cylinders measure 1 thousandth or less than stock after hone. I want to get rid of the demon. I may have it checked out to see wth is going on.

Should have been bigger than stock, but hey...

@gt, yes I know the heads don't just bolt on since the gen v cooling holes were enlarged. Felpro made a gasket (can't remember number off the top of my head) that is supposed to help this issue.

Yes, it is a gasket change, cool...

200 is not that hot but I tried to keep it around 180 on the trailer.

200įF might as well be a thousand on a jet boat... JMHO

Stock pistons and no the block was not machined. Re-ringed and new bearings.

I see no issues here. But the measurements are critical.

Agree that the oil pressure is too low. However, not low enough to cause damage. I work on diesels that have a by the book min of 5 psi. Not what I want though.

Low because of the clearance is one thing, what about the temp?

I do have a valve off the dump but it's wide open.  I didn't want to build pressure in the block especially with the 049/gen 5 combo. I know about the timing but I didn't get a chance to do it under load.

This is so fundamentally wrong I don't even know where to begin. NEVER install a valve on the dump...No reason to.

You should have a valve on the pump, this reduces the flow and the pressure, like magic.

You don't need a load on the engine to test the higher rpm timing.

I don't want to run 91 basically for the $$$. Plus stock bottom ended 454 should have zero issues with this. Plus 3 points in the octane rating on a 9:1 engine is minimal at best.

Unless your shit keeps blowing up. There are helpful additives in the higher octane fuel and the cost is minimal. I wouldn't run 87 in my lawnmower. I only buy 89 or 91.

Are you sure you don't have a piston slap your hearing?

Dick hat back on the shelf for now...  ;)


GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #9 on: June 13, 2015, 08:56:26 PM »
What is the deck height on this deal?

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #10 on: June 13, 2015, 08:58:37 PM »
You're good gt. Lol. You aren't being a dick bro. I appreciate the give it to me straight attitude. Plus I'm a marine, I can take verbal abuse and I know I don't know evetything. I'm an open book willing to learn.

I do have a gate valve on the intake as well. And you are right about the dump.

I guess I could have broken a skirt now. I have to pull it apart anyways so I'll find out tomorrow. If it was piston slap wouldn't it have been doing it from the beginning? Why did it start after 30 min of run time today, if that?

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #11 on: June 13, 2015, 09:03:47 PM »
You're good gt. Lol. You aren't being a dick bro. I appreciate the give it to me straight attitude. Plus I'm a marine, I can take verbal abuse and I know I don't know evetything. I'm an open book willing to learn.

I do have a gate valve on the intake as well. And you are right about the dump.

I guess I could have broken a skirt now. I have to pull it apart anyways so I'll find out tomorrow. If it was piston slap wouldn't it have been doing it from the beginning? Why did it start after 30 min of run time today, if that?

Sent from my SM-G900T using SoCal Jet Boats mobile app

I'm thinking you are having cooling issues.  When the pistons get hot, they change shape, it may be this change of shape that is causing the issue, if the clearances are too large, it will shatter a piston. I assume cast pistons? You should really only go to a higher clearance on forged slugs. (but you never heard it form me LOL).

The question I want to know, why is the water temp 200įF? do you have the water valve on the pump throttled down? If you don't and it still ran that hot, something is off, big time.

Thank you for your service.....  :thumbup:

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #12 on: June 13, 2015, 09:08:48 PM »
That degree was on trailer via trying to adjust for hose pressure. At the lake, at idle, it's about 140. If I use any sort of throttle it drops to unreadably low on the gauge.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #13 on: June 13, 2015, 09:08:55 PM »
You're welcome bro

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #14 on: June 13, 2015, 09:12:43 PM »
That degree was on trailer via trying to adjust for hose pressure. At the lake, at idle, it's about 140. If I use any sort of throttle it drops to unreadably low on the gauge.

Sent from my SM-G900T using SoCal Jet Boats mobile app

OK, now were getting somewhere...

The water system needs to be reviewed. I feel that the dump fitting is a bit too large, by dropping it down a little (like 3/8" inside diameter) it should raise the WOT running temp and bring the water pressure up to about 20 PSI (still fine).. It will change the cut in point of the header water, but I don't think it will hurt anything.

When I have some time later I will put my thinking hat on and come up with a possible remedy.

GT

  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #15 on: June 13, 2015, 09:12:51 PM »
Oh and the deck height is stock. The piston looks like it's out because the rod is no longer attached lmao

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #16 on: June 13, 2015, 09:15:51 PM »
I really appreciate your time and help. I was thinking that the expansion of the piston due to combustion heat vs the cylinder staying cool and contracted that it was closing the clearance thus grabbing the piston and either ripping out the bottom of the piston and or stretching the rod/cap.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

86caribbean

  • Join Date: Oct 2013
  • Location: Ontario Ca.
  • *
  • Sr. Member
  • ****
  • Posts: 258
  • Karma: +11/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 15
« Reply #17 on: June 14, 2015, 09:24:11 AM »
I read through the responses, at this time Iím leaning towards you just donít have enough piston to wall clearance. I worked for GM for many years as a heavy line technician and with them using hypereutectic pistons allowed them to run very close clearances. With you just using a stock short block and honing the cylinders to put a pattern on them and some fresh bearings just isnít enough in my opinion. Sounds like your rod and main clearances were fine but as your pistons want to expand from heat and not the cylinders from how cool a boat engine runs is your problem. Do you see a lot of vertical abrasions on the cyl. walls? In my opinion a block that has factory dimensions has to be properly machined and have the clearances for a marine purpose.
  • Boat #1: 1986 18' Caribbean

TIMINATOR

  • Join Date: Mar 2007
  • Location: Avondale,AZ. 85392 (West Phoenix)
  • *
  • Full Member
  • ***
  • Posts: 230
  • Karma: +5/-0
    • View Profile
  • Liked:
  • Likes Given: 0
« Reply #18 on: June 14, 2015, 03:28:23 PM »
GEN V and VI come with "Over-hyped-you-f***ed-me" Hypereuctetic) pistons. They are fine with a stock or low performance engine only, you can get away with them at a slightly elevated HP level if the cooling, clearances, timing and jetting are near perfect. More power, or any one or several of the issues mentioned and you break skirts first, then above that, the piston is gravel in the pan, and the pin and top of the rod make a big hole in the cylinder wall. Go forged if you want to make power, and find a machine shop that KNOWS BOAT MOTORS!!!(OK, this time I'm yelling). The number one problem we see at our shop is freshly built jet boat engines with cracked or shattered pistons, and usually after only a few outings, if cammed, manifolded and big headed. We have two in here now... 
Lets do a comparison of cast, hypers, and forged pistons on a scale of one to ten:
                     COST     and       STRENGTH

CAST                1                            1

Hypereuctetic    7                            2 or 3

FORGED           10                           10

Why pay the big bucks for something (hypers) that is only marginally stronger than cast? For a stock or near stock engine use cast, anything else, use forged. There was a very good HOTBOAT article about this subject, find it, read it, and post it. I can't, (legalities, I wrote it).
 
Hypers came out when the Federales mandated 50,000 mile mandantory smog compliance to the vehicles original owner. The factories needed a harder piston that wouldn't wear as much in the ring grooves or skirts, and could run at less clearance, all to help the smog deal. A large cast piston company knew that adding more Silica (sand) to the aluminum piston would make it harder, and they spent big bucks to conceive a way to take a normal cast (Hypo-euctetic) piston and add more sand than would normally stay in solution when cast. That's considered a Hyper-euctetic solution.
 Take a glass of iced tea (no sugar) and stir in sugar slowly until no more will dissolve into the tea, that's a Hypo-euctetic solution. If you add more sugar than it can hold at that temperature, the rest just goes to the bottom, and its still a Hypo-euctetic solution. If the temperature is raised in a very controlled manner and put in a preheated mold, JUST RIGHT, then the extra sand will stay in suspension and cast well. The extra sand makes the aluminum harder, that's what was wanted, but it also makes it more brittle, NOT what we want in a performance piston.
When GM first started putting the Hypers in all of their engines around the late 1990s (my brain is foggy about the date , not the facts) we R&R'ed at least 4 or 5 sets of them a WEEK for a local dealer, some with only "Black Death" (localized overheating and micro welding) on the skirts to siezed or exploded pistons and blocks that needed honing or replacing. We did those for about 2-4 years before they were all fixed or blocks replaced and honed as required. The rest of them were sold to old folks and peeps that babied their stuff until the wall clearances opened up. Many second owners got those babied cars/trucks and killed the pistons in the first weeks of ownership, and we did a lot of stockish motors. We always add at least .001 piston/ wall clearance minimum, and to this day do not install hypers unless its a stock or mild deal and we still add .001-.002 extra clearance depending upon the circumstances. We WILL NOT build a jet boat motor with Hypers at all for any reason. We are in Phoenix,AZ. and it gets to 110-115 here in the summer, we also do lots of motors for the Colorado River folks from Yuma to Laughlin where Summer temps will go to 120+.
Back to that harder piston deal, glass is made from Silica sand and is harder than a piston, but you wouldn't make a piston from it!  TIMINATOR
TUFENUF MARINE PERFORMANCE  623-877-8553
COMPLETE ENGINE MACHINESHOP & PERFORMANCE
JET PUMPS!!!
PM or call me with JETTECH questions for HOTBOAT MAGAZINE!!  see them in the magazine!! OOPS! not anymore! HOTBOAT is boobs up! MODESTY IS A CRUTCH FOR THE INCOMPETENT!

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #19 on: June 14, 2015, 06:09:27 PM »
Engine is apart. Seems to be an oiling issue. No damage to the top or skirt of the pistons. Also seeing excessive wear between skirt and cylinder wall. This engine maybe has an hour and a half on it. With most of that from idling on the trailer.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

mobboss

  • Join Date: Jun 2011
  • Location: elkins AR
  • *
  • Hero Member
  • *****
  • Posts: 1,323
  • Karma: +15/-0
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #20 on: June 14, 2015, 06:33:23 PM »
Ok you showed the cylinder walls should have showed the piston skirts as well. It does look like galling tho!!


Sent from my iPhone using SoCalJetBoats
  • Boat #1: boat less

1975_Challenger_461

  • Join Date: Jan 2011
  • Location: Oceanside, CA
  • *
  • Full Member
  • ***
  • Posts: 229
  • Karma: +1/-0
  • Registered User
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #21 on: June 14, 2015, 07:19:53 PM »
Boom skirts.

Sent from my SM-G900T using SoCal Jet Boats mobile app

"I'm a simple man....
I like lolie pops in my mouth and butter in my ass."

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #22 on: June 14, 2015, 07:23:05 PM »
If those cylinders were honed, something is way the heck off. What rings are you using? Have you checked the end gaps?

Those bearings look like they were peeling.  Can you get a close picture of the worst one?
« Last Edit: June 14, 2015, 07:54:01 PM by GT Jets »
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Join Date: Jan 2007
  • Location: Morgan Hill CA
  • *
  • Informative Member
  • *******
  • Posts: 11,752
  • Karma: +192/-0
  • Team Evil Weiner
    • View Profile
  • Liked:
  • Likes Given: 138
« Reply #23 on: June 14, 2015, 07:24:26 PM »
Your not getting any oil to the front of the motor bro.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

mobboss

  • Join Date: Jun 2011
  • Location: elkins AR
  • *
  • Hero Member
  • *****
  • Posts: 1,323
  • Karma: +15/-0
    • View Profile
  • Liked:
  • Likes Given: 2
« Reply #24 on: June 14, 2015, 07:28:31 PM »
Did you use a new oil pump??? How was oil pressure???


Sent from my iPhone using SoCalJetBoats
  • Boat #1: boat less

 


Website Security Test
Powered by EzPortal

anything
Website Security Test