Leak down test results
02-23-2018, 10:35 AM
#1
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Thread Starter
Leak down test results
So I did a leak down and this is what found.
With a 100 psi going in, this is what I got
#1-93psi
#2-91psi
#3-35psi intake valve leak
#4-65psi intake valve leak
#5-92psi
#6-85psi leaking into #4
#7-30psi leaking into crankcase
#8-93psi
Added a little oil to #7 and it's up t 92psi.
Pulled the heads and definitely was leakage between #6 and #4 at the head gasket.
All I have on the history of this engine is it was build in 98'. Just before I got it there was some t-stat work done. But there wasn't one in it..
It's already .030 over with SP L2465 pistons. Still hone marks in the bores.
I'm already thinking a bigger boat in the next year or 3 so don't want to dump a ton into this one.
What would you do? Hone, rings, bearings, gaskets, lap the valves and run it is my thought..
With a 100 psi going in, this is what I got
#1-93psi
#2-91psi
#3-35psi intake valve leak
#4-65psi intake valve leak
#5-92psi
#6-85psi leaking into #4
#7-30psi leaking into crankcase
#8-93psi
Added a little oil to #7 and it's up t 92psi.
Pulled the heads and definitely was leakage between #6 and #4 at the head gasket.
All I have on the history of this engine is it was build in 98'. Just before I got it there was some t-stat work done. But there wasn't one in it..
It's already .030 over with SP L2465 pistons. Still hone marks in the bores.
I'm already thinking a bigger boat in the next year or 3 so don't want to dump a ton into this one.
What would you do? Hone, rings, bearings, gaskets, lap the valves and run it is my thought..
Last edited by convincor; 02-23-2018 at 10:51 AM.
02-24-2018, 09:51 AM
#3
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iTrader: (7)
How long has it been since last ride? Might consider a valve job and new gaskets and hope for the best. But #7 could have a broken ring so I'd pull the pan and that one at the very least. Won't take long.
02-24-2018, 04:17 PM
#4
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Thread Starter
I've only got the boat wet once as I just bought it end of season. It ran decent for the one ride on a 38° day.
Don't know how long it sat before that.
So there's#7
I'm thinking it was overheated.. That # 3 cylinder intake valve is warped. Did a quick lapping and there's one area not making contact. No evidence of it hitting anywhere.
Cylinders have some rust stained areas and a few scratches I can feel.
On the happy side, crank looks pretty good and hasn't been turned yet..
oh and one lifter was tight coming out. Can feel a burr on the bottom OD.
So.... Let's build a new engine..
Going to finish tearing it down and drop it at the shop Monday.
Don't know how long it sat before that.
So there's#7
I'm thinking it was overheated.. That # 3 cylinder intake valve is warped. Did a quick lapping and there's one area not making contact. No evidence of it hitting anywhere.
Cylinders have some rust stained areas and a few scratches I can feel.
On the happy side, crank looks pretty good and hasn't been turned yet..
oh and one lifter was tight coming out. Can feel a burr on the bottom OD.
So.... Let's build a new engine..
Going to finish tearing it down and drop it at the shop Monday.
02-25-2018, 12:10 PM
#8
Registered
I've only got the boat wet once as I just bought it end of season. It ran decent for the one ride on a 38° day.
Don't know how long it sat before that.
So there's#7
I'm thinking it was overheated.. That # 3 cylinder intake valve is warped. Did a quick lapping and there's one area not making contact. No evidence of it hitting anywhere.
Don't know how long it sat before that.
So there's#7
I'm thinking it was overheated.. That # 3 cylinder intake valve is warped. Did a quick lapping and there's one area not making contact. No evidence of it hitting anywhere.
02-25-2018, 12:13 PM
#9
Registered
Thread Starter
I was referring to the warped valve, and the head gasket failure.
as for #7, IDK. There's no marks in the bores in that area.
More than likely caused by excessive heat and/or detonation.
as for #7, IDK. There's no marks in the bores in that area.
More than likely caused by excessive heat and/or detonation.
Last edited by convincor; 02-25-2018 at 09:17 PM. Reason: more details
