water pump compatability

C

clauton

Cadet
Joined
Jun 20, 2004
Messages
7
hi, i have a water pump drive from a mercury 650 65 hp. i am selling it on ebay and a customer wants to know if it is compatable with a 40 hp mercury ? it was outboard jets california stamped on the side of it and has a patent number of 3082732 on it.also oj-86 i stamped also maybe a model number and a 59996 number too.<br />thanks ,<br />clauton
 
P

phatmanmike

Captain
Joined
Oct 24, 2003
Messages
3,869
Re: water pump compatability

what years are these motors, the 40 and the 65...... that info is needed
 
Chinewalker

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: water pump compatability

If the motor is a 1973 or later 3-cylinder 650, and the 40hp is the 402-style model, then yes, the jet unit should swap out. If the unit is off a 4-cylinder 650, then no it won't. Also, be aware that some changes were made in the 1970s to the stud placement in the lower unit to exhaust housing connection. Later ones are about 1/16" further apart. Year for year, the 2-cylinder 40 hp, 4-cylinder 50hp, and 3-cyl. 65/70hp used the same lower units, save for the 3-cylinder models using a different gear ratio. That said, the jet unit ought to fit any of them (if the initial 650 it came off of was the 3-cylinder variety)...<br />- Scott
 
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