Hurth Transmission Problem

[Chief Engineer]

Engages in reverse OK

When Put Ahead, engine stumbles then stops.

Shifter lever seems to have to move WAY forward to engage.

Any Ideas?

[Jentine]

Hurth seems to be notorious for bad clutches. That would be my best guess.

[Blue Stocking]

Possibly the damper plate springs collapsed? Free-ing up in reverse and running OK, binding in forward, and stalling the engine.
I have the HBW 150, and the gear selection from forward to reverse uses the full 3" tavel of the cable, but will engage the drive mode with 1" of travel either side of transmission lever vertical travel.
Hope this helps.

[NCboatrx]

Are you sure that this transmission is not stuck in reverse?

[JiffyLube]

Have you checked the cable travel and position at the transmission?

[msoneji]

I agree with the suggestions above. Before suspecting the Tx, you should check if it is fully engaging. One way to do this would be to disconnect the cable from the Tx end and manually shift in FWD and REV. If it works fine that way, you have an cable alignment issue. If it doesn't, it could be a tX issue and you can go from there. Hope that helps.

[mofsubic]

The inside of your transmission has a clutch throw that will triger to the forward and or reverse with little pressue. First change your oil. this sounds like the problem . When changing check for a brown color. Your shift lever should also have a a 0.05mm clearance to the case. I also agree with disconnect shift cable to check by hand.

[Chief Engineer]

I'll try the cheap fix first......ATF right?

[mofsubic]

yes ATF Quantity for HBW-150 is 650ml

[KVK]

What was the outcome Chief Engineer? I have similar issues with HBW-5 and am challanged finding a reputable mechanic to rebuild the trans in the Baltimore Annapolis area. The engine would stall in forward gear, but reverse worked fine...went through the linkage adjustment, oil change and to no avail. I am assuming the clutch packs are shot. Know any rebuilders in the area?

[DeepFrz]

Would someone please explain to me how worn clutch plates could cause the engine to stall in forward gear but not in reverse. Or how old oil would cause this. I'm having trouble picturing it.

[Chief Engineer]

UPdate::::::::

As it ends up, (as another person comes out of the woodpile) the previous owner had put a left handed prop on a right hand engine.....I didn't even notice the direction of the boat, as I was down below shifting at the lever........So.....what he was doing was using reverse for forward and forward for reverse. I shoulda looked at this more closely, the clue being that the throttle cable to the shifter was gone and this mo-ron put a push-pull cable in...in lieu of the proper cable to the throttle.

The current owner pulled the transmission himself and sent it out to be rebuilt.

[mofsubic]

1st you need to say what type of Hurth gear box.

Also the manuals are on line free, for the 50 thru 250 (1 manual)

When you look at how the clutches work in the smaller Hurth the direction doesn’t effect the clutches. The clutches engage the same for forward as in reverse. only difference is which drive gear, on the output shaft has power...

There is a measurement that can be done when the transmission is apart to check if the clutch throw is the same. This might create the problem but would not come on just all of a sudden.

The shift lever should have 35mm of movement from center in both directions at the connection hole in the lever.

If your saying the engine stops in forward, either something is fouling the propeller or you have lost your bearings on the input shaft. Be careful that the bearing cap does not freeze to the bearing. It will ware your case and it will be hard to fix. But fixable..

[Chief Engineer]

Thanks for you feedback....but it is out of my hands now.

[Therapy]

Originally Posted by Chief Engineer

UPdate::::::::

As it ends up, (as another person comes out of the woodpile) the previous owner had put a left handed prop on a right hand engine.....I didn't even notice the direction of the boat, as I was down below shifting at the lever........So.....what he was doing was using reverse for forward and forward for reverse. I shoulda looked at this more closely, the clue being that the throttle cable to the shifter was gone and this mo-ron put a push-pull cable in...in lieu of the proper cable to the throttle.

The current owner pulled the transmission himself and sent it out to be rebuilt.

That merits a WOW!