runs fine at 1850rpm in forward or reverse. Over 2000 rpm
emits a loud "clacking" sound and starts to misfire. The exhaust
chuffs out blue/white smoke. Increasing the revs produces blackish smoke and the engine
, sometimes shutting down. Easing the throttle back allows the engine to recover and run on all three cylinders again (under 2K rpm).
I have changed filters and bled the system. To check that the fuel
was good I ran the engine with the intake and return fuel lines running into a bucket of fresh diesel
. I also ran a can of "Diesel Purge" through the engine while running under load. This did not change the symptoms of higher rev failure. Obviously, I suspect that I have one or more sticky injectors, but I don't know for sure.
I tried to isolate the injector by using the decompression lever one at a time with the engine under load. I could not detect the symptom of failure at any rpm, which seemed to limit at about 2250 on two cylinders.
I'm reluctant to pull the injectors, assuming that they will be well and truly stuck. I've heard that you can release the injector flange nuts a few turns and then crank the engine, allowing the compression
to budge the injector up a fraction of an inch, breaking the initial seal. Is this a reasonable way to coax them out?
Have you seen these symptoms before? Can I do the necessary work to effect a repair myself with basic boat tools?
I'd greatly appreciate your response.