Yanmar 1GM Impeller

[jim]

After having several Yanmar impellers separate from their shaft insert and thus lose cooling water, I put in the equivalent Globe Blue impeller. Today as I was pulling out the Blue impeller to inspect and replace it, the vane assembly came off the shaft hub insert (I pulled really hard on the vanes). What was interesting is that the vane assembly is molded to the shaft insert which has several indentations on its outer surface so that it seems impossible that the vane part can ever slip totally like the smooth mating between shaft insert and vanes on the Yanmar impeller. In fact, I pushed the shaft insert into the impeller part and it is still very tight and can be used as a spare. Further, the Globe people say it can run dry for 15 min. and needs no grease. This is FYI - I don't work for Globe.



james.jamieson@yale.edu

[Lou Ostendorff]

Hi Jim,
I appreciate your comments on the substitute impeller...I inspected my impeller on Karma's diesel(1GM10)after about a year and a half of use from the previous owner and myself. It wasn't a Yanmar part, but a "Johnson #825" which was oversize on width by about 1/32" or so. It was close to coming apart too; all the blades were cracked and deformed from being crammed in there...I was going to install a Speedseal Safety Cover over this old one, but obviously could not after noting its condition...so I put in a new Yanmar part. I did notice, after starting the engine, that there appeared to be twice as much water flowing through and out the exhaust. The engine has never overheated, but it makes you wonder what goes on when the design part is not installed...FWIW
Lou Ostendorff
"KARMA" CD25D
'82, #63



louosten@ipass.net

[Mimi Litsche]

Since we are on the subject of the water pump--How DO you get at the thing to inspect it? It seems to be behind a triangle shaped plate, and only two corner screws are accessible. The other corner is behind the flywheel of the engine. Does one have to pull the flywheel off and if so--how does one do that?



mlitsche@hotmail.com

[Bob]

You will need to remove the belt and using a wheel puller remove
the pulley. You will then be able to get proper access to your
water pump. Make sure to use only a Yanmar impeller for your
water pump. While your replacing the impeller make sure to replace
the cover gasket and apply never seize to the screws on the cover plate.

Bob
s/v Ranger #144
1984 CD25D

Since we are on the subject of the water pump--How DO you get at the thing to inspect it? It seems to be behind a triangle shaped plate, and only two corner screws are accessible. The other corner is behind the flywheel of the engine. Does one have to pull the flywheel off and if so--how does one do that?

Ranger1442@hotmail.com

[Bruce Barber]

Since we are on the subject of the water pump--How DO you get at the thing to inspect it? It seems to be behind a triangle shaped plate, and only two corner screws are accessible. The other corner is behind the flywheel of the engine. Does one have to pull the flywheel off and if so--how does one do that?

Mimi:

Do it the easy way: Remove the PUMP first (3 bolts directly accessible with a ratchet wrench and short extension), THEN take off the triangular cover while the assembly is in your hand. No pulling required, and the alternator belt is untouched.

Bruce Barber
25D Nancy Dawson



bruce.barber@att.net