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Old 11-04-2019, 07:10 PM   #5
Carmudgeon
Scooby Newbie
 
Member#: 84253
Join Date: Mar 2005
Location: Old North State
Vehicle:
05 REX
PSM

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Quote:
Originally Posted by Blktrax View Post
Step 1, slap a belt on it, and perform a leak down test. Will tell you how many damaged holes. Miracles do happen, you may escape undamaged.

Step 2a, Dead hole(s), pull the engine, pull heads.
(if only light impact marks on piston crowns, replace and re-lap only damaged valves and seals, check all valve clearances. Ship it.)

Step 2b, Heavy impact marks on pistons, highly likely piston is fractured or visibly cracked. Find a used or JDM long block, or sell it all as is.
Awesome, thanks. I think we are at 2a at least, as shop re-timed and no compression on one cylinder - not sure if he did leak down test, I need to speak to him anyway. My understanding is it jumped "several" teeth, not that much as even he thought we had a shot at a miracle. Not to be.

Assuming no piston damage, does it make sense to replace all the valves when in there or will it be pretty obvious which ones are bent by checking clearances? Does anything else need to be done to head before re-installing?

I take it if pistons are fractured/cracked that means damage to bore, correct?

Thanks again!
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