Water Pump Housing Not Machined... This is hard to believe.

[JDusza]

A friend gave me his 1965 Johnson, 9.5, MQ 11.
Says he's tired of dealing with it. Can't figure out what's wrong. He put it up several years. No other information other than it is junk to him.
Every subsystem on this thing needs help. I gave it new condensers, spark plugs, head gasket (compression is between 80 and 90 now, seems low but is even, initial test the cylinders were way off from one another and indeed the gasket was blown out), cleaned up the carburetor and she does run. Sounds good, actually.
Doesn't pump water. Changed the impeller and grommet and still no water.
Split the power head, no blockage. Put compressed air through the block. Seems good.
Go back to the water pump and take it apart again. Maybe the impellers are backwards. ?
After careful inspection I find there is no water path between the impeller and the water tube. The pump housing cover has NEVER BEEN DRILLED OUT.
Wonder how many of these went out? lol
J

 

[Crosbyman]

sounds impossible to have run for 50 years with no water flow ??? pass Plant inspections (several) and not lock up after 10 minutes on the water back in the 60's or whenever that housing was installed

does not make sense

80-90 psi for 9.5 seems extremely good for a motor that can run fine on 65-70 see Leroy'S
http://www.leeroysramblings.com/OMC_9.5.htm
Compression : Compression on these motors may seem lower than some of the others. Displacement of the these 9.5 hp motors is 15.2 Cubic Inches with a Wide Open Throttle of 4500 RPMs. Where the later 9.9/15 HP motors utilized 13.2 CI at 5000/6000 RPM, where higher RPM increases the HP. A normal compression reading of 65# to 75# appears to be fine for this motor.

 

[JDusza]

Yes, indeed. This is not the original cover.
Too bad. It cost this guy his engine. Quite lucky the pistons aren't trashed.
I'm gonna have to go back to him and ask if he remembers where he got this from.
Probably supposed to look more like this.
J

 

[Crosbyman]

well if ...you 80 psi can't be that bad no ?

 

[racerone]

The part appears to have an ----" aftermarket look "---- to me.-----So no surprise at all.

 

[JDusza]

Crosbyman, I got you. Thanks for the leroy's info. I've never looked up specs for this engine but I kind of understood they run at lower numbers. Thanks for the values in print. Helps my confidence!
This little unit does hum. It does sound tight. Shy one, though. It took condensers, a head gasket and a carburetor gasket to get it talking. To find the water problem I totally broke it down, emptied the whole case. It'll be something if I can get it back together without extra pieces! lol
Believing my rework will be successful, I am going after the lower unit seals. They are bad. That should be the last requirement before it sees water.
Looking forward to another "save".
J
p.s., racerone, thanks for the heads up. I'd really like to not believe this is out there.