results of compression test on my 2.6 litre series 3, from front to back.
105 140 130 135 110 125same results for wet and dry. the motor has been running well when cold but gets rough when warm, on either lpg or petrol. the spark is perfect on all cylinders so before comp. test i was thinking burnt exhaust valve.
as the trouble cylinders are far apart (105 and 110), that rules out head gasket. same wet and dry suggests its not rings, which i was 99% sure of anyway. absolutely no crankcase pressure and no oil-smoke.
exhaust valve is all it could be right? if so, is a set of new valves and a quick regrind within the scope of a backyard mechanic? anyone here who has done this on the 6 cylinder rover motor? i hear they are a bit weird to do as the exhaust valves are set in the engine block. do i need to remove the motor to do the regrind due to space restrictions?
any help would be greatly greatly appreciated.
Sam.