[C320-list] Yanmar Heat Exchanger

[Jeff Hare]

Hi Dave,

I've done this and it is trivial. Found a leaf in mine.  :)

1. Close eng. Thru-hull
2. Empty the exchanger using the little drain thingy on the aft end of the exchanger. (Optional, especially if you've had the impeller out)
3. Remove 4 nuts from the exchanger's front side and remove the end cap. 
4. Be careful of the rubber gasket

No springs, ball bearings or monkeys will fly out at you. Pretty easy. I didn't need any replacement gaskets but if yours are damaged, you might. 

The thermostat may also be the culprit.  It's on the engine AntiFreeze side, so its a bigger job. If you've changed the AF recently you could have an air block but that would cause the temp to go up a lot most likely.

-Jeff 

-----Original Message-----
From: Dave Anderer <danderer at udel.edu>
Date: Thu, 17 Jun 2010 14:10:15 
To: <C320-List at catalina320.com>
Subject: Re: [C320-list] Yanmar Heat Exchanger

Thanks.  Actually, I was thinking of just yanking the core (pop the two end
caps and push it out) rather than pulling the whole exchange assembly from
the block.  I think I saw that approach suggested in a shop manual I have
around here somewhere.

Does that make any sense based on your experience?



On Thu, Jun 17, 2010 at 1:59 PM, Jon Vez <jonvez at comcast.net> wrote:

> Dave,
>
> Very easy to do. However, make sure you order and have on hand a gasket
> that
> goes between the exchanger and the engine block. There are two types, so
> make sure you get the one appropriate for your engine....
>
> Regards,
>
> Jon Vez
> Solstice #582
>
> -----Original Message-----
> From: c320-list-bounces at lists.catalina320.com
> [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Dave Anderer
> Sent: Thursday, June 17, 2010 1:45 PM
> To: c320-list
> Subject: [C320-list] Yanmar Heat Exchanger
>
> I've noticed a slight uptick this season in the temp gauge on my 3GM30F.
> Nothing major, but it seems to run a little hotter than I recall at my
> normal cruise speed of 2800 RPM.
>
> I'm checking the usual suspects, but it also occurs to me that I've never
> pulled the heat exchanger and had it cleaned.  Looking at the manual,
> pulling it seems to be a trivial task.
>
> Anyone done this and have any insights/suggestions?
>
> Thanks.
>
>