Merc 500/50 4Cyl water pump

krammor

Recruit
Joined
Aug 19, 2012
Messages
3
I'm trying to get accurate info on this 500/50 so I can replace the impeller which isn't pushing out any water at all. A little history-- this motor has been on a stand in the garage for about 6 years--ran fine then. Hooked up the muffs--it still runs fine but won't pass water thru the tell-tale hole--getting mildly warmed water thru the prop so I believe the ports are clear. So I try to drop the LU and the drive shaft splines seem to be hung up in the power head--there's always somethin.' I'm currently trying to ease the two apart without using too much violence.
I would appreciate some help too identifying the year of this motor.
Serial #7098103. No model designation showing.
I can't get the maxrules site to open. I belive it's too modern for the oldmercs site cuz it doesn't show there. The marinshopen site shows the last ser# as 647xxxx in 1983 which smells a little fishy. I don't believe it's made in Canada cuz the hardware is not metric.
Any help would be a lot of help. Thanks
 

schematic

Lieutenant Junior Grade
Joined
Jan 12, 2008
Messages
1,102
Re: Merc 500/50 4Cyl water pump

I don't believe it's made in Canada cuz the hardware is not metric.
Any help would be a lot of help. Thanks

I think its Canadian. It wouldn't have been metric way back then. Its probably 1978-1980
 

krammor

Recruit
Joined
Aug 19, 2012
Messages
3
Re: Merc 500/50 4Cyl water pump

Thanks to both gentlemen. Greatly appreciate the info.
Still working on getting the LU to drop. Easy does it!!
 
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