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I guess I didn't explain it right. My engine was raw water cooled. A
previous owner converted it to fresh water. But left the original raw water
pump for use as the circulating pump. Inside the water jackets are piles of
salt ect.
Doug MountjoysvPegasusLF38 just west of Ballard, WA.
------ Original message------From: Rick Brass via CnC-List Date: Mon, May 16,
2016 20:01To: [email protected];Cc: Rick Brass;Subject:Re: Stus-List Yanmar
3HM or 3QM
If you have two water pumps you have a fresh water cooled engine. The vane pump
circulates a coolant mixture through the block and to a heat exchanger. The raw
water pump sends seawater through the heat exchanger and into the exhaust. On a
raw water cooled engine, the pump circulates seawater through the block and
into the exhaust. No heat exchanger. IIRC, Yanmar stopped selling raw water
cooled marine engines sometime in the 80s. From: CnC-List
[mailto:[email protected]] On Behalf Of [email protected] via
CnC-List
Sent: Monday, May 16, 2016 8:28 PM
To: [email protected]
Cc: [email protected]
Subject: Re: Stus-List Yanmar 3HM or 3QM If it hasn't been replaced it is
probably a 3QM30. 3QM30F is fresh water cooled. Mine was raw water cooled. It
has a vane type water pump for a circulating pump and another below the
alternator for raw water. TOA Marine supply has a table to help you id your
engine. Doug MountjoysvPegasusLF38 just west of Ballard, WA.
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