prop fitment merc and force

[graybird78]

would this prop work ok for my 1990 90 hp force engine .seller says part number 48 77344A45. mercury marine.hes asking 30.00. my prop has numbers p669-3
any advice would be great

 

[SkiDad]

I'm gonna say no. And also the merc prop is 17 pitch on your Michigan prop is 15. Maybe if you have dual exhaust it might fit.

 

[graybird78]

my motor is dual exhaust. previous owner had set up for sking hence 15p. i use more for fishing and pleasure.

 

[SkiDad]

I know those particular merc props won't fit the single exhaust units like I have (the hub is a hair too wide to slide into lower unit) but you might be ok on Dual exhaust - i just don't know. 30 bucks is a cheap gamble b/c you can sell it in the spring if it doesn't work easily enough. Does the prop have the hub kit with it ? if not you would need to pick up a mercury hub kit.

 

[graybird78]

yes it has the hub kit. what would i need to measure for fit.seller says 15 spline, what ive seen mine is 15 spline.

 

[SkiDad]

the props I have have a 3-3/4" hub (outside diameter) see 1st pic. This prop is for a 90-94 dual exhaust but works on my 80's model. I do know a 4" diameter will not fit my lower unit

Here is a few other internal measurements that might help - keep in mind my unit is single exhaust and I don't know if you have more internal diameter than I do. Would be good info to know.