Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selected - SailNet Community
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post #1 of 24 Old 06-25-2013 Thread Starter
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Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selected

My Universal m4-30 engine will rev up to normal when in neutral. In forward gear,only 2000rpm,in reverse engine will not go above 1000 rpm. The tranny is a Hurth WBW -50. With all cables disconnected,both throttle and transmission from Morse linkage, the same occurs .Using manual adjustments on engine and advancing lever on injector pump has same problem.
Any suggestions will be appreciated.
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post #2 of 24 Old 06-25-2013
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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

If the engine revs up normally in neutral, the issue is in the drive line. The first thing to check is that the prop is not full of growth and that there is no line or fish net around it and the shaft.

If the prop is clean, try this; disconnect the shaft coupling and then run the engine, if it revs up fine in gear the transmission is likely good so check the stuffing box, cutless bearing etc.

Stanley,
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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

Thanks for your reply. I have disconnected the shaft and the engine revs up in forward and reverse.went for a swim and the prop is fine ,no lines of anything around the running gear.the shaft turns freely when disconnected from the tranny, but same problem when shaft is hooked up and will not even go up to 1000 rpm in reverse, with a lot of black smoke when throttle is advanced, even a little.
Really buffaloed now. Any further suggestions.
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Is this new behaviour?
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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

Is the engine breathing OK? Air filter clogged or ingesting a sock can cause a loss of power under load.
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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.

Good hunting!

Tod

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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

Thank you all for your replies.
Air breather is clear, no binding in stuffing box,engine alignment is fine,dripless shaft bearing ok and shaft turns freely by hand when in neutral, connected or disconnected to transmission.
Also turns freely when I went overboard for visual inspection. Current prop is a PYI feathering 15 inch
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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

It is possible that some wear in the propeller is stopping it from opening fully in one direction. Has the prop been greased recently?

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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

prop was greased at launch, showed no problem when checked on the hard
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Re: Universal m4-30 engine will not accelerate in reverse, OK in forward Hurth selec

A stretch perhaps, but maybe the engine is torquing when in gear and causing mis-alignment, causing excess friction in the driveline. Loose or broken motor mounts?
Did this just happen or did it come about gradually? Any other work done on it recently?

Maybe something in the transmission is binding? Fluid level?

Paul T
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