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Engine rebuild tolerances needed
Posted: Thu Aug 12, 04 4:40 pm
by Anonymous
Just stripped my 360 and need to check some tolerances.
Piston ring gap in bore
Connecting rod sideplay
Big end/main bearing max tolerance after plastigauge measurement
Neither onf my mopar texts seems to provide these tolerance figures.
Posted: Thu Aug 12, 04 8:43 pm
by TrevD
Sorry miles , i can find loads of info on performance tolerances but nothing on standard engines , you could try phoning a good engine builder who knows american cars ( ICE automotive are verry helpfull) , but if you are striping the engine it would pay to put new rings and bearings in , and possibly a crank grind , i would do this just for piece of mind.
Posted: Thu Aug 12, 04 8:54 pm
by Alex
Stock motor.
Ring gaps: Compression rings .010-.020 @ 2" down bore
Oil ring rails .015 - .062
Rod clearance .006 - .014 "
Big end tolerence .0005 - 0015 "
Mains as above
HTH
Posted: Thu Aug 12, 04 9:02 pm
by Anonymous
Thanks Guys, I can measure 025 across the bores with a new (standard) ring. Funny that cos the guy who sold me the motor supplied new rings thinking the bores OK! Also, the plugs were a real good brown with no sign of oiling hmm..
I'll check the bottom end manana.
Posted: Thu Aug 12, 04 9:53 pm
by Dave-R
Just fit total seal file-to-fit rings. That should keep you running for a while before it really needs a re-bore.
Posted: Thu Aug 12, 04 11:20 pm
by Anonymous
yep, i'll re-check tomorow as I only checked the ring gap about an inch down. not in a rel hurry to re-bore just yet.