[Amel] Re: How to acid clean sea water intercoolers

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


On BeBe, #387, the 3 v-belts are exactly the same belt...really nice engineering!


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


I just replaced the 175 amp alternator and 3 belts one yanmar and 2 dayco
for the big alternator.

You listed the same number for all 3 ?

Fair Winds



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@...
<mailto:amelyachtowners%40yahoogroups.com> , "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@...
<mailto:amelyachtowners%40yahoogroups.com> , 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@...
<mailto:amelyachtowners%40yahoogroups.com> , "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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