Re: Why does my diesel not rev when in gear?
Check the tappet adjustment. Comments on blocked exhaust are relevant.
Also small engines idling for most of their life cause rings fouling.
If you have a clear exhaust and tappets adjusted, run the engine flatout tied to a dock for 8 hours to burn the rubbish out of the cylinder piston and rings. Cheapest service ever is to run flatout for a day and burn the rubbish out of the engine.
After the hot run give it an oil change.
If it won't run flatout for 8 hours tied to the dock then its not seaworthy.
Try to do it when the marina is empty, not on a Sunday afternoon.
Last edited by INMA; 04-10-2012 at 06:09 PM.