[C320-list] Perkins Perama M30 Overheating

[Bev Wright]

for me, it shouldn't be the impeller because i just had it changed in July. 

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On Aug 26, 2017, 12:42 PM, at 12:42 PM, Jeffrey Brown <oceanblues at mac.com> wrote:
>It's does sound like an impeller issue. I change mine every two years,
>cheap and easy to replace. 
>
>Jeff Brown
>949-350-5123
>
>> On Aug 26, 2017, at 6:18 AM, Timothy Woods <woodstimothya at gmail.com>
>wrote:
>> 
>> I had a similar problem with my last boat. It would overheat and when
>I
>> would restart it would cool back down. It drove me nuts for 6 months.
>It
>> end up being the raw water impeller rubber delaminented from the
>brass
>> bushing.
>> 
>> Tim
>> 
>>> On Aug 26, 2017 12:54 AM, "Bev Wright" <bev.wright at verizon.net>
>wrote:
>>> 
>>> Mark,
>>> 
>>> Thanks for your post because, coincidentally, Whoosh #15 overheated
>on Wed
>>> night in Herring Bay/Chesapeake (opposite coast!) for the first time
>ever
>>> since I got her in 07/2014 and our boats are both 1993 vintage so I
>wonder
>>> if that's a sign of something?  I was motoring to the slip after
>engine had
>>> been running/idling for 90+ minutes (hanging out waiting for a race
>which
>>> didn't happen due to no wind) and noticed that temp was about 190°
>at 3000
>>> RPM. I throttled back to 2000 RPM and it cooled down immediately to
>normal
>>> 175°. I inched it back up to 2500 and it stayed at 175° for the
>remaining
>>> 20 min trip back to the slip. I had no smoke. Today I checked the
>strainer
>>> and it was clean. Oil, transmission fluid and coolant were OK and
>dry
>>> bilge. So, it's a mystery other than maybe she doesn't like to idle
>for
>>> that long. It was suggested that perhaps something was temporarily
>blocking
>>> the raw water intake. I will be cruising this weekend and will
>obviously
>>> keep an eye on it.
>>> 
>>> Bev Wright
>>> s/v Whoosh #15
>>> Deale, MD
>>> 
>>> -----Original Message-----
>>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
>>> Behalf Of Mark Cole
>>> Sent: Friday, August 25, 2017 11:25 PM
>>> To: C320-List at Catalina320.com
>>> Subject: [C320-list] Perkins Perama M30 Overheating
>>> 
>>> My wife and I motored our boat over to a local boat yard for a
>haul-out
>>> yesterday.  About 20 minutes into the 1 hour trip, I noticed the
>water temp
>>> gauge was up to 220° and there was grey smoke (steam?) coming from
>the
>>> exhaust.  I shut the engine down and checked the raw water strainer.
> There
>>> was a little gunk in the strainer, but not much.  Everything else
>looked
>>> OK, so I started the engine up again; there was cooling water coming
>out of
>>> the exhaust and water temp was back to normal.  We motored the rest
>of the
>>> way to the haul-out and the temp gauge stayed at 175° the whole way.
> I
>>> went back to the boat this morning to start on the long list of
>stuff to
>>> do.  When I checked the bilge, there was maybe a gallon of water
>with
>>> antifreeze in the bilge.  I opened the heat exchanger on the engine,
>>> thinking it would be empty, but it was full.  When I dipped my
>finger in,
>>> it didn’t smell like antifreeze…  Is it possible that the heat
>exchanger
>>> burst when the water temperature went up?  Does that mean I could
>now have
>>> salt water in the engine block?  Anybody dealt with this before?
>>> 
>>> Mark
>>> Fiddler’s Green, #8
>>> Tacoma, Washington=
>>> 
>>>