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B510

  • Karma: +0/-0
Blow by
« on: September 07, 2015, 08:44:08 PM »
Over the weekend my boat started to fall on its face and was way under powered also was cutting out. Checked all the plugs only one looked like this. Any ideas on what it is ? Blow by ? There is some water under the valve covers. Don't know much about the motor just bought it a few months back.  New to the jet boat world.


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Flusher

  • Karma: +84/-0
Re: Blow by
« Reply #1 on: September 07, 2015, 09:04:25 PM »
Start with a compression test.  Could be a broken ring or blown head gasket.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

B510

  • Karma: +0/-0
Re: Blow by
« Reply #2 on: September 07, 2015, 09:18:05 PM »
Going to get into it tomorrow I'll start with the compression test. Thanks


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che77y

  • Karma: +2/-0
Re: Blow by
« Reply #3 on: September 08, 2015, 08:42:24 PM »
I've seen valve stem seals do the same dirty work. X2 on compression test
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B510

  • Karma: +0/-0
Re: Blow by
« Reply #4 on: September 08, 2015, 10:38:12 PM »
Got the motor out tonight. going to get into it tomorrow should know something buy tomorrow.


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B510

  • Karma: +0/-0
Re: Blow by
« Reply #5 on: September 09, 2015, 07:35:06 PM »
Safe to say it's time for a rebuild


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che77y

  • Karma: +2/-0
Re: Blow by
« Reply #6 on: September 09, 2015, 08:45:49 PM »
Dayum dude what fell in there!?
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GT Jets

  • Karma: +192/-0
Re: Blow by
« Reply #7 on: September 09, 2015, 09:02:10 PM »
Quote from: che77y on September 09, 2015, 08:45:49 PM
Dayum dude what fell in there!?

Exhaust seat. ........

GT
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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

che77y

  • Karma: +2/-0
Re: Blow by
« Reply #8 on: September 09, 2015, 09:03:47 PM »
Quote from: GT Jets on September 09, 2015, 09:02:10 PM
Exhaust seat. ........

GT
ah yea I see it now bummer man
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TrollerDave

  • Karma: +32/-0
Re: Blow by
« Reply #9 on: September 09, 2015, 09:08:15 PM »
Quote from: GT Jets on September 09, 2015, 09:02:10 PM
Exhaust seat. ........

GT

Are those just pressed in there?
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GT Jets

  • Karma: +192/-0
Re: Blow by
« Reply #10 on: September 09, 2015, 09:20:44 PM »
Quote from: TrollerDave on September 09, 2015, 09:08:15 PM
Are those just pressed in there?


For the most part. Unless they are integral.
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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

B510

  • Karma: +0/-0
Re: Blow by
« Reply #11 on: September 09, 2015, 10:33:44 PM »
At least it happened at the end of the summer. And now I have an excuse to build a bigger motor haha


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B510

  • Karma: +0/-0
Re: Blow by
« Reply #12 on: September 09, 2015, 10:37:03 PM »
I'm hopefully going to build a BBC. After I get some work done on my pump.


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JARVIS

  • Karma: +18/-0
Re: Blow by
« Reply #13 on: September 10, 2015, 12:28:44 AM »
meh,.....that'll buff out   :P

looking forward to the bigger....the better....the faster....
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  • Boat #1: '81 tahiti mini day cruiser
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-JARVIS-

B510

  • Karma: +0/-0
Re: Blow by
« Reply #14 on: September 10, 2015, 05:57:03 PM »
Yep that what I plan on. Maybe a turbo motor


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JARVIS

  • Karma: +18/-0
Re: Blow by
« Reply #15 on: September 10, 2015, 06:53:53 PM »
I'd like to build one of those also.
Good luck. Keep us posted
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  • Boat #1: '81 tahiti mini day cruiser
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B510

  • Karma: +0/-0
Re: Blow by
« Reply #16 on: September 10, 2015, 11:25:43 PM »
Yeah I've always wanted to build one so might as well build it now. I will.


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Flusher

  • Karma: +84/-0
Re: Blow by
« Reply #17 on: September 11, 2015, 08:11:26 AM »
Just thinking, if you wanted to get a little more use out of it this season, I have seen a few threads posting Ford heads for sale.  One I was able to find is: 460 Block, Crank, and Heads http://www.socaljetboats.com/index.php?topic=22233.0

The piston really doesn't look too bad, with the worst being at 12-o'clock.  You could probably run it as is, but if you were worried about a ring being pinched, I bet somebody has one of those pistons sitting around.

Good luck,

Joe
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

B510

  • Karma: +0/-0
Re: Blow by
« Reply #18 on: September 11, 2015, 04:27:00 PM »
Thanks. But I'm going to just wait till I can get a new motor in. Plus I have to rebuild the pump before the new motor goes in.


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