Tranmssion Failure on Renault Diesel

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J

Jim A.

I have a 1980 Hunter 27, with a Renault 8hp diesel. The transmission just failed (lost forward), and changing the oil did not fix it. A boatyard mechanic thinks it is "toast." He thinks there are few options, given the lack of parts for this engine, other than engine/tranny replacement, or just putting on an outboard! Anyone have any ideas or suggestions? Can this old unit be fixed? The boat is only worth about $8k.
 
Jun 2, 2004
3,567
Hunter 23.5 Fort Walton Yacht Club, Florida
Flip the Prop Over

At least you'll get forward. I'd think there would be a number of these transmisions around from folks who have needed to replace the engine.
 

MikeA

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Jun 25, 2006
1
Hunter 27_75-84 Babylon, NY
Got forward, reverse iffy

Does anyone have any documentation on where the drain/fill plug is? Is there a filter? TIA - Mike Any help would be greatly appreicated as this will probably be my last year sailing (cancer). Thanks agiain.
 
D

Dan Bryant

repairing the transmission

Jim, I had the same thing happen to mine 12 months ago. Mine got locked in reverse (no forward or neutral). Nothing like backing into the marina a full throttle to get ribbed from the next year. It is possible to fix it yourself. The transmission only has about 5 moving parts; if you lost forward the most likely scenario is that the bearing crapped out. I found all the parts I needed through Waterway Marine in Annapolis, which just orders them from Nanni in France. The basic steps are: remove engine (two guys can lift it and set it on the sole); remove transmission (about 6 bolts, it can be lifted with one hand so just take that part out); disassemble the primary and secondary shafts using a gear puller; replace the bearings and the oil seals; reassemble with a gear press. The whole rebuild cost me $160 for the parts, $25 for the tools (a 23 mm socket and a BIG pipe wrench) and $20 at an engine shop for the use of a gear press. If you need any guidence on it, or would like pdfs of the pages in the mechanics manual, just let me know (debdanbryant@adelphia.net) and I can help you out. Good Luck! Dan Bryant
 
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