[C320-list] Heat Exchanger Removal - Perkins M30

Fri Mar 13 10:31:10 PDT 2020

Notes on a few comments:

I did get the stainless exhaust elbow from Parts4Engines and it bolted right onto the rear of the heat exchanger body.  Only issue I had was output hose size.  My muffler took 2” exhaust hose and mixing elbow was sized for 1-3/4”.  I went to local hose supplier and they had a bushing that slipped onto exhaust elbow to fit the 2” exhaust hose.  I’ve since talked to another C320 owner that replaced the mixing elbow and he said his muffler took same size hose as elbow, so that problem may be solved with later models (mine is #8).

After replacing the mixing elbow, my M30 runs at a very steady 175°, per gauge, for hours.  If I hadn’t seen the temp needle go much higher in the past, I would suppect it is stuck now…

Mark Cole
Fiddler’s Green #8

> On Mar 13, 2020, at 10:17 AM, Art Harden <artstree at aol.com> wrote:
> 
> I do have an infrared gauge that says the engine is running fine. I just never knew the temp gauges were that far out. 
> 
> Art Harden
> Catalina 320 “Tortuga” #243
> 937-477-5544
> 
>> On Mar 13, 2020, at 11:14 AM, Joe Luciano <jnluciano at comcast.net> wrote:
>> 
>> Also, console gauges are notorious for being close but not super accurate.  You could easily have a 10 degree offset in the gauge itself.  If you’re still concerned, I’d buy one of those infrared temperature monitors.  You can point and shoot your engine block and get a more accurate temperature.  They are reasonably priced and make a great back up diagnostic tool.
>> 
>> Cheers,
>> 
>> Joe Luciano 
>> 2005 C-320
>> 
>> Sent from my iPhone
>> 
>>> On Mar 13, 2020, at 4:32 AM, Jeff Smith <jeffreyssmith at live.com> wrote:
>>> 
>>> The temperature should be controlled by the thermostat. You might pull it to see if it has the correct opening temperature stamped on the thermostat. The manual says that normal operating temperature is 82C, which is 180F. 
>>> 
>>> Jeff Smith
>>> S/V Sailmates, #121, ‘94
>>> 
>>>>> On Mar 13, 2020, at 7:19 AM, Art Harden <artstree at aol.com> wrote:
>>>> 
>>>> Thanks for that tip. I think I might order one. Question I have for the group is what temperature does your engine run at. Mine is usually around 190-195 and higher than what diesels generally run. I don’t get an alarm or steam out the exhaust. I just think it should be lower. I have replaced the impeller and the strainer is clean and when winterizing I have good circulation through the pump, because it will quickly suck down a gallon of antifreeze. Any thoughts. 
>>>> 
>>>> Art Harden
>>>> Catalina 320 “Tortuga” #243
>>>> 937-477-5544
>>>> 
>>>>>> On Mar 12, 2020, at 6:46 PM, Jeff Smith <jeffreyssmith at live.com> wrote:
>>>>> 
>>>>> To all,
>>>>> 
>>>>> While we are on this subject, Parts4engines.com <http://parts4engines.com/> sells a stainless steel exhaust outlet designed to replace the cast iron exhaust elbow that suffers from scaling. It is $282 plus shipping (I have not ordered it because I have not confirmed an issue with my elbow yet). I thought I would mention it here. Transatlantic Diesel also sells a stainless steel elbow, but this one appears to be custom fabricated, and it looks like it requires a removal of the exhaust manifold. The Parts4engines.com <http://parts4engines.com/> looks like you only need to unbolt the old elbow and bolt on the new elbow.
>>>>> 
>>>>> Jeff
>>>>> S/V Sailmates
>>>>> ’94, #121
>>>>> 
>>>>>> On Mar 11, 2020, at 8:14 PM, Bob Borelli <cassattC22 at hotmail.com> wrote:
>>>>>> 
>>>>>> Dave,
>>>>>> Thank you!  I would very much like comparison photos!
>>>>>> In the back of my mind always 'if it ain't broke...'
>>>>>> You also solved my 'hump hose' mystery.
>>>>>> Online searching; I have been unable to find a 'hump hose' less than 3" OD.
>>>>>> Another one my many plans next trip to the boat - take my 3" micrometer & measure the OD of the exhaust hose to see if I could dummy something up after splitting the hose.
>>>>>> I never thought to look on Catalina Direct & certainly not the C350.
>>>>>> I moved up from a C22 (a great boat) to the C320 (a magnificent boat) so I know CD.
>>>>>> Thank you for another great tip!
>>>>>> 
>>>>>> Bob Borelli
>>>>>> 1995 C320 no. 209 'Elusive'
>>>>>> 
>>>>>> 
>>>>>> ________________________________
>>>>>> From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of Dave Hupe <hoopdtwo at yahoo.com>
>>>>>> Sent: Wednesday, March 11, 2020 7:58 PM
>>>>>> To: c320-list at catalina320.com <c320-list at catalina320.com>
>>>>>> Subject: Re: [C320-list] Heat Exchanger Removal - Perkins M30
>>>>>> 
>>>>>> Bob-
>>>>>> I couldn't figure out how to break loose all 4 nuts on the exhaust elbow when I did my job, but since my emphasis was primarily on replacing my bad heat exchanger tank, it worked well for me to remove both the tank and elbow at the same time and then dismount the elbow from the tank in my garage.  Reinstalling my new tank with the exhaust elbow and wet exhaust hose already attached to it went pretty easily to slide it into place and seat the hose onto the muffler nipple without a lot of twisting/stress. However, if you DON"T have a reason to remove the tank itself, maybe look/try very hard to see if you can get the exhaust elbow off (maybe removing something else fairly easy) by itself as mentioned by Mark Cole.
>>>>>> As Mark mentioned a little heat on the wet exhaust hose and rubber end cap (and dish soap lube) during reassembly helps a lot. Also, consider alternatively using a more flexible replacement hump hose from Catalina Direct between the exhaust elbow and the muffler.  This hump hose  https://www.catalinadirect.com/index.cfm/product/2624/exhaust-hump-hose-2-id-x-6.cfm  will work, but you will also need the fiberglass splice available https://www.catalinadirect.com/shop-by-boat/catalina-350/engine/exhaust-system/exhaust-hose-fiberglass-splice-for-2quot-hose/ and a very short piece of regular 2 inch I.D. wet exhaust hose to fill the entire (although short overall) length between the muffler and exhaust elbow.
>>>>>> I am positive my exhaust elbow had never previously been replaced.  I was amazed how clean the inside of my exhaust elbow and the exhaust manifold outlet on the heat exchanger tank were (probably due to my freshwater situation). Note .... After comparing my new and old heat exchanger tank exhaust outlet areas (where the exhaust elbow mounts), I can see where people may misinterpret that there is scale buildup. I can provide comparison photos to illustrate if desired.
>>>>>> Dave Hupe
>>>>>> 1994 C320 (#32) "Mayan Sun"
>>>>>> Holland, MI
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> 
>>>>> 
>>>> 
>>> 
>> 
> 