Re: heat exchanger, belts , and oil cooler

Judy and Bill aboard SV BeBe <yahoogroups@...>


I have reviewed my notes and cannot find the photos I know I made when I did this in 2008. I do not remember any seemed straight forward at the time...possibly the tube assembly does not come out of the housing.

Regarding the exchanger gaskets check this out:

I did not have these gaskets and had to cut them from gasket was very difficult as the gasket is extremely intricate. Part number 129693-44420 was the part that I ordered and now have as spares since I cut gaskets at the time. Regarding the O ring 24321-001000, I found these these at Yanmar Panama, but probably did not need to replace them...the old ones looked good...unlike the gaskets which tore apart on removal of the end caps.

Sorry that I am not much help.

BeBe, SM2k, #387
At the Amel Pontoon, Gocek, Turkey

--- In amelyachtowners@..., "Judy and Bill aboard SV BeBe" <yahoogroups@...> wrote:


It may be 24 hours before I can reply. I am off the boat now and need to return to answer your questions.


--- In amelyachtowners@..., kimberlite <kimberlite@> wrote:


How did you get the heat exchanger out? I removed the end caps and could
not get the exchanger to slide out of its housing. I also do not see the
part number Gasket - Heat Exchanger 129693-44420 2- each listed in my

Also the belts are standard dayco belts number 17475 or 13a1205 they come
in matched sets. Same belt as the yanmar belt but better construction.

They have grooves cut into the top of the belt and allows the belt to have
more flexibility. My first set I had to get from Europe as the number was
13a1200 meaning 1200 long the USA replacement is 1205 mm long .

they are available in most auto parts stores. I got this info from the
dayco engineers, the 1200 mm version is only available for export.

I also thought that I was pushing my luck with the tranny oil cooler after
10 years .In Europe it is 500+ euros. Here it was $137-

Here is a note from the USA Rep of the British manufacturer. The Unit is the
DC60 . Made by bowman. You must order the 3367 end caps or use the old ones.

From: Sales & Engineering [mailto:sales@]
Sent: Thursday, April 11, 2013 8:39 AM
To: 'Sailorman'
Subject: RE: Marine transmission oil cooler


Thank you for the inquiry. The unit that you have there appears to be one
of the DC Series coolers; I think it is the DC60. We do not have that unit
in stock but have he next size up, I'm not sure if you have the room to go
with a longer cooler or not. Following is the pricing for both units,
please let me know if you have any questions or need further information.

Model #DC90-XAA

Price $153.60

*Unit has 3/8" BSPP oil connections and 22mm I.D. x 32mm O.D. straight hose

Delivery - In stock and can ship same day from our Watertown, MA location.


Price $137.00

*Pricing is good for any configuration.

Delivery - Allow 4 to 6 weeks

See attached catalog for dimensional data and connection sizes and

Best Regards,

Bob Bangs

Sales Representative

Therma-Flow, Inc.

Phone: 1-617-924-3877

Fair Winds


Kimberlite Super Maramu #376


From: amelyachtowners@...
[mailto:amelyachtowners@...] On Behalf Of Judy and Bill aboard
Sent: Wednesday, June 12, 2013 5:28 PM
To: amelyachtowners@...
Subject: [Amel] Re: How to acid clean sea water intercoolers


Before removing and cleaning the heat exchanger on the Yanmar 100hp, order
these parts:
Gasket - Heat Exchanger 129693-44420 2 each
O Ring - Heat Exchanger 24321-001000 2 each

You may not need to replace the O rings, but the gaskets are very delicate
and will tear when the exchanger is disassembled.

I drained the coolant before starting and reused the same coolant. I also
used this opportunity to change the thermostat, gasket and the 3 fan belts.
Thermostat 129470-49801 1 each
Gasket, Therm 129795-49551 1 each
V-Belt 25132-004600 3 each

Disassembly/assembly is straight forward. It has been several years ago and
I do not recall any issues or problems.

Hope this helps.

BeBe, SM2k, #387

--- In amelyachtowners@...
<> , "Judy and Bill aboard SV BeBe"
<yahoogroups@> wrote:

Gary, I will completely answer when I can get to my laptop. It was the
freshwater exchanger. There are some gaskets and O rings you must have
before attempting. I will come back with details and part numbers.



--- In amelyachtowners@...
<> , amelliahona <no_reply@> wrote:


That is very helpful. Thanks for the On-Off info. I will look into it.
When used as a hull cleaner does it etch the gelcoat at all?

Which Yanmar heat heat exchanger did you clean? Was it the fresh water
to sea water exchanger, the seawater to engine oil exchanger, or the sea
water to transmission fluid exchanger?

I know that the Yanmar sear water to fresh water heat exchanger tubular
core is a separate part from the housing in which it sits. Can you elaborate
on the removal process/difficulty if indeed you have done that?

Thanks for all your help.


--- In amelyachtowners@...
<> , "Judy and Bill aboard SV BeBe"
<yahoogroups@> wrote:


I was in New Zealand and could not buy acid because it requires a
special license...I had a marine engineering shop do it for me.

However, I did acid-wash the heat exchanger core on the Yanmar using
On-Off which is a combo of hydrochloric, oxalic and phosphoric acids. I let
the heat exchanger core soak in the On-Off for about 5-10 minutes until it
was visibly clean. I then rinsed it with fresh water and soaked it in a
bucket of baking soda and water to neutralize any residual acid.

A side note about On-Off: On-Off is advertised as a hull cleaner, but
is also an excellent metal cleaner and rust remover. DO NOT USE it on chrome
plated turnbuckles or chrome plated winches as it will remove the chrome.

Hope this helps.

BeBe SM2k, #387

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