bad blocks
- Thread starter trk2992
- Start date
Blood
Driveler Emeritus
Cavitation is a big problem if you have it.
Cavitation occurs when the minerals n such aren't neutralized.
It's basically corrosion behind the piston liners that cause little explosions.
I know a couple who spent about $25k on a crate engine from a company with a good rep.
Turned out to be a nightmare because it was cavitated.
Cavitation occurs when the minerals n such aren't neutralized.
It's basically corrosion behind the piston liners that cause little explosions.
I know a couple who spent about $25k on a crate engine from a company with a good rep.
Turned out to be a nightmare because it was cavitated.
mndriver
curmudgeon extraordinare
cavitation would be on the liners, not the block.
Other than cracked, it it's warped. The head would likely be machineable but different from the block. The sleeves already will have a set amount that they are above the block. My 5AM brain isn't coming up with the term for it.
The flywheel end could be warped and unsalvageable. If any of the locations where a bearing mounts has had the bearing spin on it galling the hole past salvage. I have seen people send a block in (granted on a car/pick up) and have them welded up and then machined out back to spec. That's hit and miss and depends on the skills of the machinist more than anything.
Other than cracked, it it's warped. The head would likely be machineable but different from the block. The sleeves already will have a set amount that they are above the block. My 5AM brain isn't coming up with the term for it.
The flywheel end could be warped and unsalvageable. If any of the locations where a bearing mounts has had the bearing spin on it galling the hole past salvage. I have seen people send a block in (granted on a car/pick up) and have them welded up and then machined out back to spec. That's hit and miss and depends on the skills of the machinist more than anything.
Blood
Driveler Emeritus
I'm not a hydraulic engineer or anything...
but I know a coupla people who have had enormous problems with cavitation in an engine which had nothing original other than the block and crank.
The couple who spent $25K on the crate engine lost that much again in downtime before the vendor FINALLY made it right with a replacement engine (after dicking them around for nearly a year).
but I know a coupla people who have had enormous problems with cavitation in an engine which had nothing original other than the block and crank.
The couple who spent $25K on the crate engine lost that much again in downtime before the vendor FINALLY made it right with a replacement engine (after dicking them around for nearly a year).
mndriver
curmudgeon extraordinare
I posted this video in this thread.
https://www.truckersforum.net/forum/threads/cooling-system-maintenance-what-do-you-use.81546/
https://www.truckersforum.net/forum/threads/cooling-system-maintenance-what-do-you-use.81546/
Copperhead
Well-Known Member
Detroit has been taking blocks with cracks, and even blown out sections, and rebuilding them using a spray metal technique, and having blocks that are totally restored and meet standards for new blocks.
As for the coolant, I have been sold on the Extended Life Coolants like the Final Charge stuff, for quite a while now. Better protection and not having to waste time on regular testing and adding SCA's. I had it as initial fill from the factory on my last truck, and as the initial fill on the factory rebuilt 12.7 Series 60 in my present glider truck. I even put it in my Jeep Liberty diesel, which is wet sleeved.
As for the coolant, I have been sold on the Extended Life Coolants like the Final Charge stuff, for quite a while now. Better protection and not having to waste time on regular testing and adding SCA's. I had it as initial fill from the factory on my last truck, and as the initial fill on the factory rebuilt 12.7 Series 60 in my present glider truck. I even put it in my Jeep Liberty diesel, which is wet sleeved.
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Southern Fried
Well-Known Member
If I remember right it's termed "crush depth".... the amount a sleeve flange and the copper gasket crushes down into the block when the head is torqued down.
The "old" engines could be leveled on top and then the sleeve recesses machined down an equal amount because they had lots of metal. Not sure about the "new" ones. In these days of "lightweight' construction and "throwaway", things like structural integrity means less than the "coolest electronics".
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