Before I go to the machinist and look like a total newb with a good credit rating, I have some questions about what they can or can't do and some of the cost implications. Being a m90 it spins pretty fast to begin with, and I'll likely megasquirt it or war chip it to r3v even higher. ARP studs and cometic mls headgasket are in the works.
I have my m90 tore down of everything but the head, block, and all the moving internal parts. Sadly it probably ran hot at some point in the last 30yrs/160000 miles as the entire inside of the engine is a deep black color. No immediate evidence of a failure though, and I had it running well just before pulling it.
At the minimum I'll take the head off and look for cracks. Can it be hot tanked with all the valves and rockers installed, or does it have to come all apart first? What should I have them do?
From the sounds of it, rocker breakage is common enough to throw a new set of rockers on, probably the trick rocker locks, and get the whole three angle valve grind and a skim of the mating surface. Sounds expensive though. Just check the valve guides and call it good?
As for the bottom end, I just assume leave it alone since people say that m30 family bottom ends are good forever. But can it be magnafluxed for cracks and hot tanked to clean for paint with the rotating assembly installed?? Besides visual scoring on the cylinder walls or obvious piston damage, what would prompt tearing the bottom end apart?
Are you sick of reading yet?
I have my m90 tore down of everything but the head, block, and all the moving internal parts. Sadly it probably ran hot at some point in the last 30yrs/160000 miles as the entire inside of the engine is a deep black color. No immediate evidence of a failure though, and I had it running well just before pulling it.
At the minimum I'll take the head off and look for cracks. Can it be hot tanked with all the valves and rockers installed, or does it have to come all apart first? What should I have them do?
From the sounds of it, rocker breakage is common enough to throw a new set of rockers on, probably the trick rocker locks, and get the whole three angle valve grind and a skim of the mating surface. Sounds expensive though. Just check the valve guides and call it good?
As for the bottom end, I just assume leave it alone since people say that m30 family bottom ends are good forever. But can it be magnafluxed for cracks and hot tanked to clean for paint with the rotating assembly installed?? Besides visual scoring on the cylinder walls or obvious piston damage, what would prompt tearing the bottom end apart?
Are you sick of reading yet?
Comment