VicS
Well-Known Member
Before you tear into the gear box can you try running the engine with the box in gear but with the shaft disconnected ?
reduced power output
- Thread starter Davef
- Start date
billskip
Well-Known Member
fuel filter changedonce I got it bled and started still no difference so thinking it must be the gear box? once disconnected the shaft moves backwards and forward and turns freely at each position except if its pulled in to far when the rope cutter jams on the Pclamp, in the normal position it rotates freely. will try removing the cutter altogether then if that doesn't work get a compression test, if that's Ok I will take the gearbox apart to see if that's the problem
I think you have just solved your own problem, The prop will push the shaft forward (the same effect as you pulling it forward.
Anyways stick it in reverse under load and see what happens to the revs
VicS
Well-Known Member
He does say in the opening post
"the engine revs freely under no load but when I engage forward or reverse I only get circa 1500 revs,"
Davef
New Member
Before and after drive shaft pictures added the distances are exactly the same but to discount the rope cutter I will shim it out about 1/2 " to ensure that it freely spins with the shaft, it it works well I will know its the cutter otherwise its back to the gear box I fear.. (once I have checked the compression) will let you know how I get on and thanks again for all your advise and suggestions
lw395
Well-Known Member
If the engine is being stalled to low revs, it should be getting loads of fuel and producing black smoke.
Would people agree with that?
I therefore suggest either fuel starvation or a governor fault. There may be a filter gauze on the inlet to the injector pump to check.
Is it possible to measure the max fuel actually delivered by disconnecting an injector and collecting the fuel while cranking decompressed?
I would check the lift pump is delivering plenty of fuel before doing anything elaborate.
HTH
Would people agree with that?
I therefore suggest either fuel starvation or a governor fault. There may be a filter gauze on the inlet to the injector pump to check.
Is it possible to measure the max fuel actually delivered by disconnecting an injector and collecting the fuel while cranking decompressed?
I would check the lift pump is delivering plenty of fuel before doing anything elaborate.
HTH
Stork_III
Well-Known Member
There is a small inline filter in the banjo fitting to the lift pump on the MD 20** series, don't know with the 2001 engine.
VicS
Well-Known Member
Yes
I think I already said something along those lines back in post#14
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Davef
New Member
Definitely no black smoke I will check for filters before commencing anything major
VicS
Well-Known Member
It would be silly not to consider a simple partial blockage in the fuel system somewhere.
tank outlet ?
tank outlet ?
billskip
Well-Known Member
Agree, Sorry I had forgotten that by the time I had read all the posts, But
There is something wrong with being able to "pull the shaft forward" and causing a restriction,even if its down to fuel or sumat else.
Also in reverse prop cavitation normally causes a lot less load,therefor
he should get the revs,so it does point to fuel starvation,of course that is If he did actually try it in reverse...and not just in gear..