piston clerance
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Senior User
Joined: Apr 2003
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piston clerance
what whould be exceptable clerance between piston and cylinder on a 239
I just took a 239 apart and ther is a lot of space between them I have a set of 30 thou over pistons that seem to fit good
I should mention that the moter had no compresion that is why I took it apart
could be someone,s quick sell fix?
I just took a 239 apart and ther is a lot of space between them I have a set of 30 thou over pistons that seem to fit good
I should mention that the moter had no compresion that is why I took it apart
could be someone,s quick sell fix?
Lead Driver
Joined: Oct 1999
Posts: 6,782
Likes: 558
From: Kalispell, MT
Time to get out your caliper. The shop manual shows the max manufacturer's bore diameter as 3.1899 or clearance between piston and cylinder wall as .0099
.030 over would make your pistons 3.210 plus .0099 makes 3.2199" If your bore is in that neighborhood you should be good. Remember if you're too close to piston size that expansion occurs with heat from combustion. Rings should have about .015" end gap when installed.
.030 over would make your pistons 3.210 plus .0099 makes 3.2199" If your bore is in that neighborhood you should be good. Remember if you're too close to piston size that expansion occurs with heat from combustion. Rings should have about .015" end gap when installed.
