[C38] Twin Disc direct replacement for Hurth or ZF tranmissions

[Chuck Finn]

/Max,
This looks very much like the Beta Marine transmission I installed this 
summer! *TECHNODRIVE Twin Disc TMC 40 P transmission, /NEW: US $1,098.00 /*
*/from http://soundmarinediesel.com/transmissions.shtml/*
*/My original Hurth ZF failed last summer and I had it rebuilt.  Whole 
job cost about $3000 and took more than a month.  It failed again this 
summer with less than 40 hours total on the transmission.    I don't 
know whether the second failure  was due to a bad rebuild or shoddy 
workmanship by Shelburne Boatyard (of the 8 bolts that hold the 
transmission to the engine, 3 were so loose they were removed without a 
wrench).  Our webmaster (Anders) removed the Hurth transmission the 
second time around and it took him 45 minutes. /*
*//*
*/I did have problems with the original Beta transmission sent (it would 
not reliably shift into forward), but the folks at sound marine diesel 
were so accommodating that despite having to switch it out I would still 
recommend them.  They spent a couple hours on the phone with me and even 
sent the replacement without charging me for having two of their 
transmissions in my possession  (I wanted the replacement on hand so I 
could change it out when I had the time)./*
*/You should also be aware there is a 1/4 inch difference in the height 
of these transmissions.  For those of us keeping the 5424, this requires 
we lower the engine a 1/4 inch.  This can be challenging, given where 
our motor mounts are and the fact most folks will find the nuts and 
threads are in rough shape.  Speaking of motor mounts!  I highly 
recommended that you change out your motor mounts and install a flex 
coupler when changing the transmission!  You can pretty much bet your 
motor mounts need replacing after 10 years and some engine manufacturers 
recommend half that time.   Another reason to change your motor mounts 
during transmission work is there is a lot more room back there to work 
without the transmission in the way and it takes about 40 pounds off the 
motor lift.
And don't let a boatyard tell you you need to pull the boat to do this!  
I paid for three lifts ($900) because Shelburne Boatyard insisted this 
was necessary. They said the prop shaft would have to be removed to make 
room.  After disconnecting the drive shaft coupling, put a hose clamp on 
the end of the shaft and slide it back until there is enough room to 
work on the transmission  (the hose coupling ensures you don't 
accidentally let the shaft slide out of the boat).

Yes, Steve, I need to write this up as a tech article!

Chuck Finn
Mighty Quinn  #114
Great Lakes/*/*/*/
/*/***//**

**//**


On 9/18/2011 10:12 PM, Max Soto wrote:
>
> Hi everybody,
>
> For those who are planning to replace the Hurth HBW100 or newer ZF 
>  M10 from the Universal 5424, M35 and  25XP series, according to some 
> marine engine manufacturers and some forums, these new ZF trannys are 
> now half as strong and reliable as our old long lasting Hurths....
> I was told that the place that makes all the internals is not the same 
> and this is what made the huge difference.
>  When I was quoting, I was told by the engine sales person  to buy the 
> bobtail engine and install my old transmission instead of the new ZF10 
> that they use, or go to the new Twin Disc MG340.  The twin disc MG340 
> is the right replacement for our engines, and is what Phasor MArine 
> and Betamarine are recommending now after so many problems with 
>  customers that were using ZF10....
> They share the same foot print, shaft and coupling measures, so,  same 
> damper plate and bellhousing adaptor can be used. Engine just has to 
> be raised 5mm and shifting cable routed to port of the tranny,  and 
> that's it. They are supposed to be stronger and more reliable. Plus, 
> they are a few bucks cheaper.  I know it because I just bought one for 
> a friend with a Perkins engine...
>
> http://www.twindisc.com/MarineProducts/MarineTransSeries_mg_340.html
>
> Again, this is just what I have been told, but after checking some 
> forums, it appears to be true..... If planning to go this way, please 
> do your own research... But hopefully, this will help some of you..
>
> Regards,
>
> Max Soto
> C38 #198 ESTANCIA
> Puntarenas, Costa Rica
>
>
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