I have a raw water cooled 2QM15. Off and on over the 19 years I have owned her,
I have had weird cooling problems, usually after I have run for a while, then
sail, and then turn on the motor to go home - it squeals from what appeared to
be overheating.
It got worse. I chased down the entire cooling system more than once. Replaced
the input hose, made sure everything was clear from the input to the
exhaust.....not much help.
The old exhaust riser (iron pipe) finally failed and I had a new one built.
Still a problem even with the new hose. I was looking at everything.... it got
very bad...checked the water pump and found the impeller was toast. Took all
the pieces home and glued them together to make sure I had all the parts -
still had an overheating problem with a brand new impeller - remember, I had
checked everything in the system and it was OK....
Changed the sensor..no help...changed the zincs... no help... was just about to
take the head off. Looked (again) at the hoses from the water pump into the
engine. The hose leading to the zinc on the front (bow end) of the engine was
mostly clogged with a very rusty piece of an impeller.
I have been replacing my impellers rather regularly for the 19 years I have
owned the boat. I have never had a bad impeller until this latest one (which I
had all the parts of). I wonder if there has been this hard, rusty piece of an
impeller in there all this time????
Pulled the damn thing out and the water flow is better than it has ever been!
As was stated - find the pieces!!!!
Gary
----- Original Message -----
From: Josh Muckley
To: cnc-list@cnc-list.com
Sent: Tuesday, December 03, 2013 9:47 PM
Subject: Re: Stus-List Impeller link to photo
Some one already mentioned it but, make sure you find all of the little
pieces of rubber from the impeller. Hopefully none of them made it past the
heat exchanger. You might find a shop-vac helpful.
Josh
On Dec 3, 2013 8:40 PM, "Kevin Driscoll" <kevindrisc...@gmail.com> wrote:
Apologies for my links not working. You should be able to see impeller and
Osprey's stern here at dropbox:
https://db.tt/PcqiFwLs
Thanks for helpful info. Going to buy one of those belt tension jacks for
sure!
Kevin 30-2
Sent from a mobile device.
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