Excellent explanation. When I check my impeller in the spring I just massage it
with Vaseline.
Sent from my iPhone
> On Jun 9, 2020, at 10:11 AM, Josh Muckley via CnC-List
> wrote:
>
>
> Typical closed/freshwater/glycol loop pump with standard metal impeller.
>
> See attached photo.
>
> J
While we're on the subject of water pumps for Universal diesels,
remember that Oberdorfer now makes a replacement pump (N202M-908) for the
OEM G908 Sherwood raw water pumps that came on many Universal diesels (M-12,
M-18, M20, M-25, M-25XP, M30, M40, M50). The Oberdorfer is not only
cheaper but th
Typical closed/freshwater/glycol loop pump with standard metal impeller.
See attached photo.
Josh
___
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use
Centrifugal pump theory.
https://youtu.be/lmjIQqo8mX4
Josh
On Mon, Jun 8, 2020, 11:47 David Knecht via CnC-List
wrote:
> I thought I might have had a problem with the fresh water side of the
> cooling system of my Universal M4-30 engine because it was heating water
> very slowly. I now think t
This is not exactly how the flexible vane pumps work but pretty close. The
idea of expanding and contracting volumes is well shown.
https://youtu.be/L30JpM8Lv_A
Josh
On Mon, Jun 8, 2020, 11:47 David Knecht via CnC-List
wrote:
> I thought I might have had a problem with the fresh water side of
The glycol closed circuit is referred to as the freshwater loop. This loop
is circulated the same way as the coolant in your car. A pump half shell
is mounted to the engine block which makes up the other half. The two
halves sandwich a metal impeller which creates the driving force, works on
the
Yes similar impeller,
Almost all tabs were cracked badly at base on both sides Of center
And pump needs to be loosened / removed to Get Belt back on anyway
The wheel on the pump had a sleeve inside which needs to be put in correctly so
they set screw can get all the way to the shaft of the pum
Hi John- My manual makes no maintenance period recommendation for the fresh
water impeller. Not mentioned in maintenance at all. Does yours? I am
unclear on why the raw water needs periodic maintenance and the fresh water
does not. Is it a similar rubber impeller? Dave
S/V Aries
1990 C&C 3
Just rebuilt my freshwater pump on my 3HM which was done aftermarket as it
covers the engine ID plate.
Was leaking just a bit but the bit caused some rust and ceased the engine kill
switch on that side of engine
Needed impeller change anyway ;)
John Conklin
S/V Halcyon
S/V Heartbeat
www.flirt
David,
You have a circulating pump usually driven by a belt off of the crank
pulley, also this belt drives the alternator. This pump usually doesn't
require any maintenance. There is a weep hole below the shaft to signal
when a seal has failed. There is a thermostat that controls the temperature
o
I thought I might have had a problem with the fresh water side of the cooling
system of my Universal M4-30 engine because it was heating water very slowly. I
now think that it is just that the sea water is cold this time of year and it
was taking longer than I expected. All was fine with lots of
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