I have a Perkins
Prima M50 driving a ZF12M new in 2016 (645 hrs). Boat
First 41.5 . The following has happened about 6 times on different occasions. After having to motor
for over 5 or 6 hrs at approximately 1800rpm I bring the rpm
back to idle speed for docking
now suddenly cannot rev above idle even if I push to full throttle. I disengage forward place in neutral and now can rev the engine
to full throttle if I want , put it back into forward and again I can’t get any more revs than idle again. After about 10 mins of idling in gear
I can mysteriously now rev above idle in gear
. There is “no problems” with the Morse cables
“none whatsoever” the cables
move to full throttle on the injection pump
to full throttle when this mysterious problem occurs without the engine revs increasing above idle (yeah doesn’t seem possible does it ?).
This problem is occurring randomly and is otherwise operating perfectly the engine/trans is running powerfully and perfectly as it is maintained correctly.
temperature is operating between
65c & 85 c it is currently running without a cooler .
Is this problem something anyone has ever heard of before ? I have a ZF15m to install with a cooler in the future figuring a heavier workload trans might be better.
The original trans did 8000 hrs before I decided to try and relieve the torsional vibration problem they have behind the Perkins
however I never did have this problem previously.
Thanks for any advice.