Blew the head gasket today Need Help!!

« **on:** May 17, 2009, 05:15:49 PM »

Do i need a marine application water pump? Or can i just pick up a new water pump from pep boys/napa? Also do you guys know the bolting sequence for the headers? I could really use some help on this one fellas...thank you.

« **Reply #1 on:** May 17, 2009, 05:27:18 PM »

You have a water pump on your jetboat? Not just a waterpump block off plate?

« **Reply #2 on:** May 17, 2009, 05:54:53 PM »

Quote from: bertus on May 17, 2009, 05:15:49 PM

Do i need a marine application water pump? Or can i just pick up a new water pump from pep boys/napa? Also do you guys know the bolting sequence for the headers? I could really use some help on this one fellas...thank you.

Umm what Tony said...water pump?

A pic or 2 might be in order. On the header deal...when in doubt start in the center and move out.

« **Reply #3 on:** May 17, 2009, 05:57:38 PM »

Done all of the time, I would recomend eliminating the pump, but....the only difference between a marine and an automotive is the rear plate is made of 316 stainless steel on a Chevy, a Ford there is no difference.

FWIW if you decide to rid of the pump, the temps will not be as constant.........

We use them a lot on closed cooling setups, just so ya know.

GT

« **Reply #4 on:** May 17, 2009, 06:48:01 PM »

Okay so im a dumbass...

no water pump. but i do have a blown head gasket. there was a octagon shaped piece of metal underneath the intake manifold that was about a 1 1/2 long. the pistons dont look bad and neither do the heads. I pulled the gaskets and they look perfect. im really confused here as to what exactly is going on. there is no cracks or hot spots in the gasket where it may have give way. here are a few pics so far. going to get a new gasket set and headbolts. judging by the pics do you guys think i should send the heads in and have a valve job done on them?? or should i replace the gaskets and go from there. I am going to pull the motor drop the oil pan and drain out all of the water/oil/chocolate milk. What type of oil should i refill the motor with??

« **Reply #5 on:** May 17, 2009, 06:51:38 PM »

Thats a hexagon shaped piece of metal AKA an oil pump driveshaft (broken)..

GT

« **Reply #6 on:** May 17, 2009, 06:53:16 PM »

heres a couple pics of the head gasket. I am still going to replace them but its just kinda wierd that there is nothing wrong with them. also the last pic ( i think is the timing chain cover). if that gasket went would it allow water into the oil? is it possible that thats why the head gaskets are still perfect and the heads arent warped? there are no ridges or scoring on the piston walls on the block. all the rings seem to be in great shape. The guy i bought this from told me that it was off a fresh rebuild (and it shows cause all the gaskets look brand new)

« **Reply #7 on:** May 17, 2009, 06:54:11 PM »

so the oil pump is toasted then? which would explain why the oil pressure gauge read 0. so the motor got hot and blew the gasket then?

« **Reply #8 on:** May 17, 2009, 06:55:12 PM »

heres the pics

« **Reply #9 on:** May 17, 2009, 06:55:15 PM »

Where you pushing to much water into the block?

« **Reply #10 on:** May 17, 2009, 06:57:46 PM »

I dont think so. I have ran the boat 5 times before this with the water valve in the same position and no problems. I honestly dont know chit about the way the jet pumps the water into the motor.

« **Reply #11 on:** May 17, 2009, 06:59:49 PM »

Quote from: bertus on May 17, 2009, 06:54:11 PM

so the oil pump is toasted then? which would explain why the oil pressure gauge read 0. so the motor got hot and blew the gasket then?

Dunno, but that is definately an oil pump DS. How it got up there is beyond me.

As far as water intrusion, Fords have a lot of ways to get water in them, (more so than Chevies). , timing cover, intake manifold gaskets, exhaust system, and more I'm sure...

GT

« **Reply #12 on:** May 17, 2009, 07:00:09 PM »

Quote from: bertus on May 17, 2009, 06:57:46 PM

I dont think so. I have ran the boat 5 times before this with the water valve in the same position and no problems. I honestly dont know chit about the way the jet pumps the water into the motor.

I think that may be why you blew out your head gasket. To much water in and not enough out.

But what the hell do I know!

« **Reply #13 on:** May 17, 2009, 07:02:40 PM »

IMHO-you have a big issue with the broken oil pump shaft. You should pull the engine, pull the pan and see what is going on with the lower end. Somethng is very wrong there.
T.J.

« **Reply #14 on:** May 17, 2009, 07:05:23 PM »

Quote from: TJS Nordic on May 17, 2009, 07:02:40 PM

IMHO-you have a big issue with the broken oil pump shaft. You should pull the engine, pull the pan and see when is going on with the lower end. Somethng is very wrong there.
T.J.

That's what I'm talking about

How the hell did that shaft chunk get all the way up there?

GT

« **Reply #15 on:** May 17, 2009, 07:06:55 PM »

so when i get everything fixed i should try taking it out and scaling back the valve a little bit. the temp ran at about 150-160. should i just get a factory replacement oil pump for that motor? so if the motor wasnt getting any oil and it blew the head gasket what is the probability of my piston rings being shot and the heads warped? visually they look good. they look straight as can be from the side.

« **Reply #16 on:** May 17, 2009, 07:08:45 PM »

do the valves look shot on the heads? i thought that the cabon deposits on the valves were normal. I dont want to replace the oil pump and gaskets and then take it out and have the same problem happen. Or still have an issue with the heads.

« **Reply #17 on:** May 17, 2009, 07:09:12 PM »

Quote from: bertus on May 17, 2009, 07:06:55 PM

so when i get everything fixed i should try taking it out and scaling back the valve a little bit. the temp ran at about 150-160. should i just get a factory replacement oil pump for that motor? so if the motor wasnt getting any oil and it blew the head gasket what is the probability of my piston rings being shot and the heads warped? visually they look good. they look straight as can be from the side.

My fear is for the rotating assembly; crank, rods, cam, yada yada. Heads probably not so much, the combustion side of things may be OK.

GT

« **Reply #18 on:** May 17, 2009, 07:28:52 PM »

Quote from: TJS Nordic on May 17, 2009, 07:02:40 PM

IMHO-you have a big issue with the broken oil pump shaft. You should pull the engine, pull the pan and see what is going on with the lower end. Somethng is very wrong there.
T.J.

do this before any thing else

« **Reply #19 on:** May 17, 2009, 08:11:01 PM »

I am going to get a cherry picker within the next few days and ill pull her out and take a look. i will post pics of my findings. Also the dizzy is stuck and will not come out. Is the oil pump driveshaft connected to that in any way??

« **Reply #20 on:** May 17, 2009, 08:12:09 PM »

the dizzy drives the oil pump

« **Reply #21 on:** May 17, 2009, 08:22:48 PM »

the gear on your dizzy gets turned by the camshaft and theres a shaft that comes out of the bottom of the dizzy that goes down and spins ur oil pump. Those head gaskets look good to be honest, usually youll see where it blew out. That chunk of metal is 100% reason without a doubt to pull the oil pan off and see whats going on down there. You may have gotten lucky and you just need a new pump, because when the pump locks up because of it being worn out or if something gets in it, it will usually break the oil pump drive shaft before it messes up the dizzy but I have seen the shaft not break and wreck the dizzy. I would pull the pan and check for metal or other stuff in the oil and at the least replace ur pump with a high volume one or even a stock one while the pans off. Let us know if you have any more questions...

Also, you will get alot of black carbon buildup on the valves over time, its completely normal. You have to do a compression test to see if you need to replace ur valves. :-) hope this helps.

Andy

« **Reply #22 on:** May 17, 2009, 08:27:11 PM »

thanks guys. I will post pics of what i find out. I am praying that i got lucky and it was because of the oil pump breaking.

« **Reply #23 on:** May 17, 2009, 11:22:00 PM »

Looks rebuilt alright. D1VE block, Probe dished pistons with early-style heads (the good ones). About 9.5:1 c/r. Buy an assembly manual for the 460. Not sure what would cause your oil pump drive shaft to break unless your oil pump picked something up from the pan that locked it up. Be sure to check that the pump spins freely; don't re-use the head gaskets; have the heads checked for flatness; might be a good idea to look at a few bearings, etc. Frankly, with pieces in the engine it's wise to disassmble and clean the entire thing. This is not as costly as an engine rebuild but it can be labor intensive for the average enthusiast.

LO

« **Reply #24 on:** May 17, 2009, 11:23:24 PM »

Quote from: GT Jets on May 17, 2009, 06:59:49 PM

Dunno, but that is definately an oil pump DS. How it got up there is beyond me.

GT

The rotating assy must have tossed it through the valley breather hole and into the valley....talk about dodging a bullet!

LO

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