Thinking the flex plate on our Yanmar
3GM30F is starting to fail. Engine
in forward at low idle there’s a clunking sound for three or four seconds, where eventually engages; or, we increase the RPMs. Sometimes transmission
engages fine, without the clunk noise
. Seems to run a bit rough however, it may be my imagination.
Are there any tests that I can do short of removing the bell housing and inspecting the flex plate? Any other sounds or things to look for? What is involved in replacing the flexplate; is this simply removing the housing removing the flex plate and seal and replacing with new? Any idea how many hours this might take? Any other parts
I need to order?
Or is this something else altogether!