19-05-2018, 12:19 PM
Any suggestions, my 1936 special keeps oiling up No.3 plug, this is now so bad it is covered in just a couple of miles.
The engine was rebuilt no more than 1000 miles ago, rebored +20, new pistons, rings etc. Have checked compression and all four are between 7.0 and7.6 bar. No oil baffles are fitted.
I have pulled the offending piston suspecting broken rings but they are fine. I have checked ring gaps which were set at 0.006 to 0.008 when installed, and find the oil rings are now 0.010 and 0.015 which seems a bit odd.
If this was OHC I might suspect valve guides but vintage car friends (non A7) suggest with side valve oil through the guides is unlikely.
Any suggestions?
The engine was rebuilt no more than 1000 miles ago, rebored +20, new pistons, rings etc. Have checked compression and all four are between 7.0 and7.6 bar. No oil baffles are fitted.
I have pulled the offending piston suspecting broken rings but they are fine. I have checked ring gaps which were set at 0.006 to 0.008 when installed, and find the oil rings are now 0.010 and 0.015 which seems a bit odd.
If this was OHC I might suspect valve guides but vintage car friends (non A7) suggest with side valve oil through the guides is unlikely.
Any suggestions?