Re: [Amel Yacht Owners] Heat Exchanger [1 Attachment]
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Patrick McAneny
John, I have no Orings , the rubber end caps have two different diameters ,the larger dia. clamps around the H/E housing and the smaller dia. part clamps around the insert. May be that I am missing parts and this is what the previous owner came up with. I have been looking online for a blown up diagram. Is the TMD22A a Perkins 4-108 ? I can find new end boots for it . The temperature increases with the rpm , at 2500 it got up to 215F, slow down and it decreases to 190 or so.
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Thanks,
Pat
SM#123
-----Original Message----- From: john.biohead@... [amelyachtowners] To: amelyachtowners Sent: Sat, Jun 2, 2018 8:27 am Subject: Re: [Amel Yacht Owners] Heat Exchanger [1 Attachment]
[Attachment(s) from john.biohead@... [amelyachtowners] included below]
Hi Pat,
I attached the TAMD22 service manual, the cooling system starts on page 93. I can tell you if you are blocking holes it will significantly reduce the heat removal ability of the HX. I see in the manual that there appears to be o rings on the metal end caps. This is how I would expect it to be.
What kind of over heating issue do you experience? It could be something unrelated to the HX like drawing air from a cracked SW hose(happened to me) or leaking anti siphon, leaking backflow preventer....
Regards, John
John Clark
SV Annie SM 37
USVI
---In amelyachtowners@..., wrote : Mark, Reading your reply, I realized that I left out an important fact ,that my engine is a Volvo TMD22a . So my exchanger may be different from yours. I suspect it is, I see no where ,where a O ring would reside.All my small tubes were clear , what was partially block were two of the four larger holes in the bronze housing where antifreeze passes through.On my H/E there is two rubber boots on either end where the water enters and leaves from and they are secured with s.s.clamps. If they should leak ,and they are under pressure raw water could mix with the antifreeze.So if anyone with a TMD22a could tell me if there is Orings or silicone ,I would appreciate it.
Thanks,
Pat
SM3123
-----Original Message-----
From: 'Mark Erdos' mcerdos@... [amelyachtowners] <amelyachtowners@...> To: amelyachtowners <amelyachtowners@...> Sent: Fri, Jun 1, 2018 5:13 pm Subject: RE: [Amel Yacht Owners] Heat Exchanger Hi Pat,
It sounds as
though you are on the right track.
The ends should
be sealed with a rubber o-ring. Depending on the engine type there are
sometimes 2 o-rings. There should not be silicone. You should be able to look
through the tubes and see nothing but air. Any obstruction is going to cause
you grief especially near the ends as this is where the sea-water changes
direction. If you look at the design of the HE, you will see the how the
seawater changes direction two times before moving on.
While you are
in there, also check the after-cooler, if you have a turbo charger. This can be
another are where the copper tubes become blocked and foul the flow of
sea-water.
The anti freeze
is moved along the outside of the tubes by the engine’s fresh water pump. The
sea water is moved by the sea-water pump impeller on the inside of the tubes. The
anti-freeze is cooled as it makes contact with the other side of the copper
tube.
Hope this helps
you.
From:
amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Friday, June 1, 2018 1:23 PM To: amelyachtowners@... Subject: [Amel Yacht Owners] Heat Exchanger I have had my heat exchanger off several times over the years ,and
reinstalled it as the previous owner had and not questioned it ,until now. I
have had an overheating issue for years and am resolved to solve it . The
previous owner applied silicone on the end caps to seal them. Is this normally
done? When I just removed the H/E I found that as I pushed the cap on the last
time ,the silicone was pushed back and covered better than 50% of one of the
four holes and about 25%of another. Which brings me to another question. Is the
antifreeze forced through the holes or does it just come into contact with the
tubes as it moves along with the flow,I assume the later.
Thanks,
Pat
SM Shenanigans #123
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