Re: [Amel Yacht Owners] Hurth Transmission Coolers


Bill Kinney <greatketch@...>
 

Alexandre,

ZF and Hurth transmissions are identical, but I should be clear which one I have.  

My engine is the Volvo TMD22, the transmission is a Hurth 250, later in production known as a ZF 25M.  There is no external oil circulation on this model.  The standard installation is only air cooled from the transmission oil through the case.  The seawater cooler is an afterthought, just bolted to the side of the case. Heat from the transmission oil is conducted through the transmission case, then through the wall of the cooler to the seawater that flows through the cooler on its way to the engine.  By cooling the oil, the seawater cooler increases the horsepower rating of the transmission.

If your transmission has an external shell and tube heat exchanger, my modification doesn’t apply. 

I got my new cooler from Foley Engines in Worcester, Massachusetts.

It sounds like the one Eric is talking about is different than mine.  

Bill Kinney
SM #160, Harmonie
Block Island, RI
“Ships and men rot in port."





On Aug 27, 2016, at 07:37, Alexandre Uster von Baar uster@... [amelyachtowners] <amelyachtowners@...> wrote:

Thanks for the great information !!!  

Does any one know if this is the same issue on the ZF Transmission?  

Also does any one know a supplier to get a spare hose for the transmission: 
http://nikimat.com/volvo_tmd22p_missing_hoses.html
the purple one is for the transmission. 

Sincerely, Alexandre
SM2K #289 NIKIMAT
Club Nautico de San Juan, Puerto Ric

--------------------------------------------
On Fri, 8/26/16, greatketch@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: [Amel Yacht Owners] Hurth Transmission Coolers
To: amelyachtowners@...
Date: Friday, August 26, 2016, 9:09 PM


 









One of the things that Joel told me to
keep on my maintenance schedule was inspection of the Hurth
Transmission cooler for corrosion.  Many thanks to him for
mentioning it, it is something I would have missed.  Sure
enough, mine needed to be replaced.
It's very much a crappy
design:  A cast aluminum box made part of the engine
galvanic electrical circuit.  Not surprising that it has
issues. I have read rumors that there is a stainless steel
version also available, but that would have its own
problems.  Stainless has a much lower thermal conductivity
than aluminum, so it wouldn't cool as
efficiently. 
I installed a new aluminum
cooler, and modified it to accept a zinc anode.  You can
see photos and some more details on our blog here:  An
engine project.  


An
engine project. One
of the great things that came to us when we purchased this
boat was the experience of the yacht broker who arranged the
sale.  Joel has a vast store&nbs...  




View on fetchinketch.net 


Preview by Yahoo  

Bill
KinneyHarmonie, SM
#160Block Island,
RI"Men and ships rot in
port."http://fetchinketch.net 









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