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el mojado

  • Karma: +15/-0
Broken valve retainer
« on: June 01, 2015, 11:00:27 PM »
So this is what grenaded #8 piston and exhaust valve. Piston chunks are all over my intake ports. Any other damage possible? Cruising at 4000 rpm when it happened. It happened instantly with no warning sounds of any kind. Just a KABOOM! What would cause a keeper/retainer to fail?
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che77y

  • Karma: +2/-0
Re: Broken valve retainer
« Reply #1 on: June 02, 2015, 06:28:40 PM »
Dam man well we all love wrenching on our boats time for a badass upgrade...... only theory but maybe the keeper never quite made it in the retainer correctly? 
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el mojado

  • Karma: +15/-0
Re: Broken valve retainer
« Reply #2 on: June 02, 2015, 06:40:04 PM »
Twisted rod. Cracked head at valve guide. Scored cylinder.
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philofab

  • Karma: +1/-0
Re: Broken valve retainer
« Reply #3 on: June 02, 2015, 07:01:28 PM »
Some cams let the valve slam shut at high rpm, and it could have just chosen that time to give up. 4000 rpm is rough on an engine.

How long had the engine been together?
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el mojado

  • Karma: +15/-0
Re: Broken valve retainer
« Reply #4 on: June 02, 2015, 08:34:14 PM »
Ran it twice last season. And twice this season. Full rebuild.
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GT Jets

  • Karma: +192/-0
Re: Broken valve retainer
« Reply #5 on: June 02, 2015, 08:54:41 PM »
Who's keepers and what retainers?

Sent from my SCH-I545 using SoCal Jet Boats mobile app

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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

GT Jets

  • Karma: +192/-0
Re: Broken valve retainer
« Reply #6 on: June 02, 2015, 09:22:31 PM »
 Do you know the valve guide clearance?
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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

philofab

  • Karma: +1/-0
Re: Broken valve retainer
« Reply #7 on: June 02, 2015, 09:31:15 PM »
Only out 4 times? Nothing would have been worn out unless the valvetrain was setup very wrong or old parts were used.

Was the rocker and pushrod in tact?


Sent from my iPhone using SoCal Jet Boats
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GT Jets

  • Karma: +192/-0
Re: Broken valve retainer
« Reply #8 on: June 02, 2015, 09:45:25 PM »
Quote from: philofab on June 02, 2015, 09:31:15 PM
Only out 4 times? Nothing would have been worn out unless the valvetrain was setup very wrong or old parts were used.

Was the rocker and pushrod in tact?


Sent from my iPhone using SoCal Jet Boats

If the valve stuck in the guide, the piston could have come up to say hello.
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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

el mojado

  • Karma: +15/-0
Re: Broken valve retainer
« Reply #9 on: June 02, 2015, 10:27:23 PM »
Used springs and keepers. Only parts which were not replaced. EVERYTHING else was new.  Rockers and push rods were all in tact.
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GT Jets

  • Karma: +192/-0
Re: Broken valve retainer
« Reply #10 on: June 02, 2015, 10:34:06 PM »
Quote from: el mojado on June 02, 2015, 10:27:23 PM
Used springs and keepers. Only parts which were not replaced. EVERYTHING else was new.  Rockers and push rods were all in tact.

Doesn't that figure?

GT
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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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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

el mojado

  • Karma: +15/-0
Re: Broken valve retainer
« Reply #11 on: June 02, 2015, 10:34:53 PM »
Yup....
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