[C38] heat exchanger

[Robert Miller]

Hi, Jon.  I replaced my 2" heat exchanger with a 3" one.  My operating
temperature dropped 20-30 degrees and that was before I found that my
exhaust elbow was 95% restricted with carbon.  Can't wait until next week
when my mechanic installs the new exhaust system.  I purchased the 3" heat
exchanger from H&H Marine Engine Service, 7002 Macpherson Ave, Burnaby, B.C.
I'm looking at the invoice but there is not an internet address although I
ordered it over the internet.  The part number you are looking for is
299818.  The cost was $330 plus $20 shipping.  I installed it myself.  The
trick is, figure out how long the hoses should be and add 6".  Then while
sitting in the cockpit, install the hoses on the heat exchanger and then do
the yoga exercise of the final installation through the anchor locker.

 

Hope this helps,

 

Bob Miller

"Bolero" #113

Southwestern YC in San Diego

 

From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org] On Behalf Of Jonathan Whitney
Sent: Friday, March 05, 2010 12:40 PM
To: listserve at catalina38.org
Subject: [C38] heat exchanger

 

Hi,

I am a proud new owner of a '79 Cat 38 "Kuu Haku".  The engine is a
Universal 5424.  Recently had some overheating issues when sailing back from
Maui to Oahu.  Coolant was leaking somewhere, temp gauge reading over 200 F.
Replaced scaled seawater lines, removed the heat exchanger (3" replacement,
I'm guessing, as I think the 5424 originally came with a 2" exchanger).  It
was visibly clogged and anode totally gone.  So I took it to a radiator shop
to get boiled.  They called and said there were a bunch of leaks and needs
to be replaced.  My question is:  Is it possible to replace just the core,
or should I just get a replacement exchanger?  Also, has anyone replaced a
similar unit for less than the ~$400 at Torrensen.  Are there any
replacement brands to stay away from, or others people have had good luck
with?  

 

Also, as I have noticed a slow leak in the coolant, it seems safe to say
that FW/antifreeze is leaking into raw water, but should I assume seawater
has contaminated the FW side.  I have drained and flushed all the FW
coolant, but if there is a chance seawater has gotten in the lines should I
do something else to treat the FW side to ensure all seawater is flushed
out.  

 

Any information would be really appreciated.  

 

Jon Whitney

1979 Cat 38 "Kuu Haku"

#54

Honolulu, Hawaii

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