Replacing Hurth transmission

[Padrone]

It looks as though I am going to have to remove/replace the transmission on my Catalina 30 driven by a Universal 25XPB.
Question, Do I have to remove the sink unit ?
Can I remove the transmission while in the water, can the shaft be slid back to allow the transmission to be removed ?

Many thanks,

 

[Barnacle Bill]

If your stuffing box is in good shape, you should be able to remove the tranny while the boat is in the water. I just did that with a Chris Craft with a much larger engine. I assume there is enough room to move the shaft back far enough to clear the spline, etc.

 

[jeepbluetj]

Yup, remove the sink cabinet. It's pretty easy and it'll give you so much more room to work. One of the nice things about a C-30 is the engine access with the sink gone.

Pretty sure if you google it there's some info out there on where the screws all are.

 

[Padrone]

Thanks to all, the transmission is now out, bit of diffulty removing the middle Port side bolt as the case is so close, eventually as a twelve point socket could not be aligned and kept slipping off, used a six point and lo and behold it came off !
I have to find someone to overhaul it now....any suggestions, I am in the North East?

 

[RichB]

Just yesterday called Foley. Spoke with Dr. Diesel. Had a very short conversation in which he mentioned that they always advise to buy a new Hurth instead of remanufacture. You MUST email drdiesel@foleyengines.com with complete specs. That is the ONLY way they handle Hurth/ZF inquiries... goodbye! But they are probably the best source. Plus you can get other diesel engine parts. I was impressed that Dr. Diesel was soo very busy.

 

[kmacdonald]

The Hurth HBW 10/ZF12M is very easy to rebuild if you have a press. Seal kits that include a thrust ring are readily available for little money, approx $50. The forward thrust ring is usually what gets worn and the forward/reverse clutch disks can be swapped. ie move forward clutch disks to reverse clutch disk position and reverse to forward. I have also heard of just turning the thrust ring around instead of replacing it. The bearings are the same as used in trailer wheel hubs and are about $9 each times 4 bearings but they don't usually require replacing.

 

[CYQK]

AVOID FOLEY
The kit they sent me was crap and Dr. Diesel was a rude jerk!!!
Sent mine to a shop in Amboy New Jersey
Rick Neary's East Coast Transmission
These folks did nice work!!

 

[RitSim]

I did this job on our former boat. Since you are further along, this won't help, but I used a deflated soccer ball under the oil pan with the rear mount nuts off. I inflated the ball to raise the rear of the engine ( coupling already disconnected and pushed back). I was able to get the tranny out without removing the cabinet but it was tight. I did rebiuld the tranny with a kit from MER in Washington state - really good to deal with. When I reassembled, I added lock washers to the interior bell housing/tranny connection. This caused a problem in reverse and had to disassemble again to remove. I wasn't sure if the shaft play was normal or I had caused a rebuild problem. I ended up buying a NEW Twindisc tranny for the same price as a 2nd hand rebuilt. Fit the same, worked the same- loved it because it was new and I didn't inherit some old problem on a rebuild. A few years later I need to fix a cracked head and did remove the cabinet. Finding all the screws takes most of the time.

 

[njlarry]

Several excellent you tube videos. Not hard nor long to rebuild although you need access to a press.

 

[uralite]

When I did mine, I replaced with PRM60. Call Mike at Harbor Marine in Everett WA. Was a better option then rebuilding, less money when all is said and done.