Hurth transmission problem

[AndrewD]

I have a Beta BD662 with a Hurth gearbox. It works OK in reverse gear - a bit of vibration but nothing remarkable. In forward gear it will drive at idling speed - with huge, spectacular, amazing vibration - whole engine leaps about on its mountings, prop shaft hits off inside of stern tube, etc, etc - and then if you increase the revs at all the drive just dies away - along with the vibration. Alignment seems OK. Cable adjustment doesn't seem to affect things (I tested it with the cable disconnected, working the lever on the box by hand), Cutless bearing is new, shaft is clean. The gearbox oil level looks OK but the oil is blackish and sooty in appearance. Last changed n years ago.

Anyone got a clue?

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[dickh]

Hmm - Hurth gearbox - I've also had trouble with mine last autumn. mine was fine in reverse, only in forward when idling but when revs increased, prop shaft just carrried on idling and then the drive would engage with a clunk when lever revved up & down. Stripped it down - no obvious cause of fault but replaced clutch plates and re-assembled - boat being launched this week so will find out at the weekend if I have been successful.
The oil should not be black & sooty - it sounds as though it has damaged the internals somehow. The only solution is to repair. Can't remember Hurth's address but they are helpful. Repair can be expensive unless you DIY and on the small boxes can be cheaper to replace.
Search on Hurth Gearbox in the archives and yuo'll come up with lots of info.

<hr width=100% size=1>dickh
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[Anchorite]

What model is it? I bought spares from Lancing (bearings), prices normal.

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[dickh]

Re: Hurth transmission problem/Spares

Should have added, you can get Hurth spares from <A target="_blank" HREF=http://www.asap-supplies.com>http://www.asap-supplies.com</A> and standard items like bearings and seals(much cheaper) from any industrial supplier such as Bearing Services Ltd. or Fenner - or other local suppliers

<hr width=100% size=1>dickh
I'd rather be sailing... /forums/images/icons/smile.gif<P ID="edit"><FONT SIZE=-1>Edited by dickh on 07/04/2003 15:00 (server time).</FONT></P>

 

[stubate]

if i remember right the hurth has got a motorcycle type clutch in the innards with friction material type plates and metal plates alternated, if the oil is kacky with soot it sounds like you have burnt clutch plates, try changing oil first but dont hold out much hope
stu

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[dickh]

Yes, they are exactly as stubate describes, I'll get the contact for Hurth tomorrow and post it for you.

<hr width=100% size=1>dickh
I'd rather be sailing... /forums/images/icons/smile.gif

 

[Heckler]

was told by volvo techie

the other day that the ms1l fitted to the later md2030 was a hurth in diguise with said clutch and that it engaged by a ball bearing running up a ramp and forcing plates together. if ball is not doing job clutch will slip?
etc
stu

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