[C320-list] Heat Exchanger Removal - Perkins M30

[Bob Borelli]

Thank you also Mark for your comments!   I had an over heating problem due to the raw water impeller & no alarm at the pedestal control panel, I have a plan to test the circuits, which led me to consider a 'raw water failure alarm'  on the exhaust hose just down stream of the exhaust elbow (www.borelmfg.com).  Then I read the 2 articles in Main Sheet, considered that the previous owner had replaced the elbow once, the M30 diesel has 1000+ hours; best I should inspect the interior of the elbow before I attempt to fix one problem without looking to see if there is another.  Both the elbow & hose are expensive, I was wondering if there was another way to determine if the elbow is rusted up (exfoliated?).  And does any one have an experience with the 'raw water failure alarm' on the exhaust hose?

Bob Borelli
1995 C320 no. 209  'Elusive'  Georgetown MD

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From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of Mark Cole <boatnboot at me.com>
Sent: Wednesday, March 11, 2020 6:17 PM
To: C320-List at catalina320.com <C320-List at Catalina320.com>
Subject: Re: [C320-list] Heat Exchanger Removal - Perkins M30

Like Dave mentioned, that exhaust hose is so stiff and the section so short, you won’t be able to remove the exhaust elbow off of the bolts without cutting the hose.  The four nuts came off very easly for me without removing the heat exchanger body.  Not sure if I had to remove anything extra or not…. Once off, I sure couldn’t chip any of the buildup inside the elbow away.  The scale seems about the same consistency as the metal!

Soaking the new exhaust hose and the heat exchanger boot in hot water before reinstalling helps get everything back together.  A little dish soap doesn’t hurt either.

Mark Cole
Fiddler’s Green #8

> On Mar 11, 2020, at 3:03 PM, Bob Borelli <cassattC22 at hotmail.com> wrote:
>
> Thank you Dave for your comments!  Then I will plan on cutting the exhaust hose & replacing with new hose.  I was concerned about damaging the fiberglass muffles so best to cut the hose.  And you also recommend removing the tank & elbow as a unit for access to the 4th elbow flange bolt?
> ________________________________
> From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of Dave Hupe <hoopdtwo at yahoo.com>
> Sent: Wednesday, March 11, 2020 5:10:39 PM
> To: C320-List at Catalina320.com <C320-List at Catalina320.com>
> Subject: Re: [C320-list] Heat Exchanger Removal - Perkins M30
>
> Bob-
> A couple comments about your post:
> 1. The small nipple on the rear rubber boot is the only direct input to the exhaust elbow from the heat exchanger tube itself. It is too small to be able to clean anything out without removing the elbow.
> 2. I doubt you could just unbolt the elbow and slide it sideways to clean out the elbow.  You would put far too much tension on the short section of wet exhaust hose and likely break off the fiberglass inlet nipple on thee muffler.
> 3. There is very little free exhaust hose between the exhaust elbow nipple and the inlet nipple on the muffler.....maybe only about 4 inches of "free hose". It is not a situation where you can bend the hose in the middle and pull off one or both ends easily.  It was so stiff on mine, I wound up cutting it off to prevent from breaking the muffler inlet nipple.
> Thanks,Dave Hupe
> 1994 C320 (#32) "Mayan Sun"
> Holland, MI________________________________________________________________________________________________
>    On Wednesday, March 11, 2020, 04:54:40 PM EDT, Bob Borelli <cassattc22 at hotmail.com> wrote:
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>
> Jeff,  I have considering how to remove the exhaust elbow from my Perkins M30 espescially after reading both Mark Cole and Dave Hupe’s articles in the previous issues of Main Sheet magazine.
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> I thought about:
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>  1.  Removing the rubber boot off the top of the elbow & looking, scraping inside, look with bore scope?
>
>  2.  Just un-bolting the 4 bolts holding the elbow onto the tank, sliding in sideways, still attached to the exhaust hose to examine the inside of the elbow.
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>  3.  Using a hair dryer to heat the exhaust hose to remove it off the elbow & the muffler to look inside the elbow.
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>  4.  Be prepared to buy a new elbow and hose.
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>  5.  I like Joe Lucaino’s removing the exchanger & elbow to my garage.
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> Overall I worry about breaking off a bolt.  And creating a bigger problem.
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> Bob Borelli
>
> 1995 C320 no. 209  ‘Elusive’
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