Transmission help

[DCatSea]

OK - Just went out for a run across the Bay to Tilghman Island, to shake down after the winter's work. All was running beautifully - engine was running cooler than ever before (150 @ 2500 rpm), previous sound and vibration issues apparently solved by putting in new mounts, all electrical systems operating properly and life in general looking and sounding good.. Mazboot banging along like a good'un, at easy 7 kts. Weather fabulous, sea like a mill pond, no traffic.

Only issue - a small regular loss of ATF, which was an issue from last year, but controllable - keeping a good eye on it, while recognizing that there is a potential issue to get professional help on.

Approaching Eastern Shore of MD, we heard a nasty noise from engine room. Quick scan revealed ATF in engine room bilge, and a dry transmission dipstick. Allowed trans to cool, and added ATF, and tried to go ahead. No forward gear engaged - astern was very good.

Then the weather unexpectedly changed, and a yacht race appeared in the distance, rapidly gaining on us. On a happy note - the BoatUS towing insurance worked really well - highly recommended.

Questions:
1) Can anyone identify the Hurth transmission in the pic. below? Is it a ZF 12M 2.1:1 - Hurth HBW10 HBW125, or other model?
2) Has anyone had this "one direction only" problem in the past, and can you advise on cause / fixes?

I'm hoping this will "just" be an opportunity to have the transmission rebuilt, and hope I don't need to replace it, (we have a reportedly excellent marine transmission mechanic locally - in Deale MD), but if I do need to change - it happens

Hope to have this done so we can float down to the Chesapeake Rendezvous on 6/24.

Any and all advice and assistance most welcome.

[Jeremyvmd]

I'm no transmission expert but sounds like you might have fried the forward clutch plates. Only concern would be what did the heat generated damage...

[Sprig1]

Hi Doug that looks like my transmission. I have a 1984 model it's number is HBW150-1,9R Nr.: 11-3194 5 Hope that helps I have the stickers off they like to fall off. My boat is coming along. Sorry to hear about the problems. Give me a call if you need more information

[DCatSea]

Thanks Chris, very useful, and I guess I'll find out for sure once we start "getting to it". I am going down on Monday to start looking for numbers etc, and chatting up the people who will probably be doing the work.

I am hoping that Jeremy is looking along the right lines; I am no transmission expert either, by I am trying to be optimistic about it being "only" the clutch plates". Having the tranny on the workbench will be a good opportunity to make sure it is 100% operative before taking off on longer trips.

Other positives:
1) I can now install a new swim ladder under the platform without doing water gymnastics.
2) May be a good opportunity to repack the stuffing box.
3) May be a good time to look into a new flex-coupler. (existing is good, but we all know how Murphy love a challenge)

Know that I am still planning to be on the Chester River this year, and look forward to seeing your 27FC over beers.

Doug

[Sprig1]

I hope the information helps. About the only thing I haven't done is the motor mounts, flex coupler and transmission. So it will be interesting to talk to you about that. I have never had my boat in the water it will be interesting to see how it runs. That will be fun this summer can't wait. How many hours are on your motor and transmission?

[DCatSea]

I'm registering 1549 hours on the engine and transmission. This will probably change once I have had the tranny fixed. I'll look forward to seeing yours in the water soon, and talking about keeping 27FCs happy and running well. Sure it will be an interesting conversation. I have done the mounts, as you know, but haven't done flex-mount. Transmission is now a work in progress.

Doug