Join Date: Apr 2003
Location: Rock Creek, Maryland
Thanked 25 Times in 25 Posts
Rep Power: 15
Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec
So what you are saying is that when you disconnect the shaft from the tranny, the engine behaves normally. When reconnected, you can not rev the engine up to 1000rpm and you get a lot of black smoke. Black smoke is an indication that something is putting a big lode on the engine that it cannot spin the prop. The black smoke is unburned fuel. Usually, in 90% of the time the culprit is a fouled prop. You have dove on your prop and say it is clean of barnacles or other foulants. So that leaves the problem in your stuffing box or cutlass bearing. How is your packing in the stuffing box? Do you get drips when shaft is turning? Is it a regular stuffing box or dripless packing? I'm wondering if it would be binding, creating too much resistance / friction on the shaft. Did you just repack it or change anything there? Different packing material like that gore-tex? It might be fine when turned by hand but when turned by the engine create such heat that it binds up. Your problem might be there. How is the alignment of your engine / shaft? If you have a broken mount, maybe the engine alignment is out and there is friction at the stuffing box.
Sailing out of Rock Creek, Chesapeake Bay
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