From the beginning. Motor
has always ran great with regular maintenance
. One day I say a large puff of black smoke and that is it. On next trip out I checked everything (oil Coolant
ext..) and everything was normal. during the day it ran away on me (was not to bad but took about 8 seconds to return to idle while throttle was cut), I shut down and inspected everything but found everything was normal. On my return to the dock
it ran away again with same outcome and inspection
Next week I came to start working on it and found the oil
had come up and would pour out the dip stick hole. Coolant
had not done down at all so I figured it was fuel
Drained the oil
and checked for water
separation but found no separation of any type even after letting it sit overnight.
Removed and replaced the fuel
supply pump, dismantled the old one just to see if the diaphragm
was damaged and found nothing. I removed the injector pump
and injectors and had them tested. Pump checked out and was calibrated, injectors were replaced because one was stuck open and the other was only opening partially.
I put everything back together and it tested out at the dock
100%. Even sounded better and ran smother than before. After 3 hours of testing between idle, high idle and in gear
up to 1500 rpm
everything was looking great. No change in oil level.
Took her out for a run, 850 rpm
- 2300 rpm everything was normal. From 2300 you get throttle lag. When you move the throttle about 3/4" with no reaction. Then RPM will start to climb as normal. At 2600 RPM the exhaust water
turns black. I collected some and it is full of suet particles. Not oily at all.
With no load the engine
will run up to 3000 RPM with correct throttle response and clear water.
Here is all I can figure, please confirm if you think I am correct.
When removing the injector pump
I did damage the 2 of the 3 shims. I could not easily get locally so I carefully flattened them and miked them to be .18 all the way around. 2 shims were .18 and 1 shim was .25. If I did not do this accurately and the damaged area was holding the pump up slightly then would this cause my problem? The pump is sending fuel a micro second late and when under a load the access fuel is being burnt. Where should I go now? Replace shims with new ones and/or look somewhere ells? Would this cause the throttle lag that never existed before?
Sorry for the long post but I appreciate any help you can offer.