Heat Exchanger

fourreins · Post by **fourreins** » Sun Jan 23, 2011 12:41 pm

I will be replacing the rubber end caps on the heat exchanger and was curious if you need sme type of sealant on them.

prowlersfish · Post by **prowlersfish** » Sun Jan 23, 2011 12:56 pm

No sealer need or recommended . with that said if the surface is in poor condition a thin coat can be used . But if in good condition use only the gasket or seal

fourreins · Post by **fourreins** » Sun Jan 23, 2011 1:05 pm

thank you!

rbcool · Post by **rbcool** » Sun Jan 23, 2011 1:42 pm

Both Mercruiser and Crusader recommend using a sealant. Here's a quote from Crusader that is identical to Merc

1. Remove the bolts securing the heat exchanger
end plates. Remove the end plates and gaskets.
2. Clean the water passages in the heat exchanger
by inserting a suitable-size wire brush into each
passage. Use compressed air to blow out loose
particles.
3. Clean the gasket surfaces on the end plates and
the heat exchanger. Apply PerfectSeal to both
sides of the new gaskets. Install the end plates
and the new gaskets onto the heat exchanger.
Install the bolts and tighten securely.
4. Start the engine and inspect for leaks.

Personally I've always used a very thin coat of grease to almost any wet location gasket.

Ron

prowlersfish · Post by **prowlersfish** » Sun Jan 23, 2011 1:49 pm

My books say different , but what ever you do Don't glob it on , if you put anything on put it on thin .

fourreins · Post by **fourreins** » Sun Jan 23, 2011 2:38 pm

Perfectseal??? Where can you buy that? You mentioned you use thin coat of grease...what type of grease?

rbcool · Post by **rbcool** » Sun Jan 23, 2011 3:38 pm

I would try Bob @ Beacon here. If they don't have what you need try this :
Marineparts.com

GASKET SEALING COMPOUND, 4 OZ.

"Replaces: Mercury 92-802881A 1, 92-34227 1 (Perfect Seal), OMC 317201, 508235 (Gasket Sealing Compound). A slow drying, non-hardening brush-top sealant. Gasoline, oil and grease resistant.",

SKU: 47-37559
Price: $8.35

Ron

prowlersfish · Post by **prowlersfish** » Sun Jan 23, 2011 4:38 pm

I did find PerfectSeal listed in some of my gas books , however looking at my Diesel info nothing is shown .

Almost eveyone I have seen leaking had lots on sealant on it . So don't over do it .

I will keep doing dry

alexander38 · Post by **alexander38** » Sun Jan 23, 2011 4:54 pm

Wet , dry. How about a little silicone compound and call it quits. And leaving the rubber dry can hurt.

prowlersfish · Post by **prowlersfish** » Sun Jan 23, 2011 5:09 pm

silicone as in RTV No way

alexander38 · Post by **alexander38** » Sun Jan 23, 2011 6:23 pm

Compound !! Not rtv, compound is a silicone lube non-harding Navy uses it to keep rubber gaskets soft and pliable, can't use rtv on heat exchangers it could get in the tubes.

rbcool · Post by **rbcool** » Sun Jan 23, 2011 8:07 pm

Well how about 5200

JUST K I D D I N G

In all honesty...... on that type of gasket I usualy use a lube, then wipe it off with my fingers. Keeps the gasket supple, holds it in place while installing, and I have never seen a leak. Ditto on raw water pump gaskets at the inspection plate.

Ron

alexander38 · Post by **alexander38** » Sun Jan 23, 2011 8:52 pm

5200 !

this is clearly a place for Homer home owner tub and tile off white sealer RTV.

and yes I'm a smarta$$

prowlersfish · Post by **prowlersfish** » Sun Jan 23, 2011 9:07 pm

I will be nice I will be nice I

Allen Sr · Post by **Allen Sr** » Mon Jan 24, 2011 4:41 am

prowlersfish wrote:I will be nice I will be nice I

BITE THY TONGUE'S