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Old 05 September 2011, 15:06   #1
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 530
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Identifying Mercury Gearbox ratio?

Hi guys, I am trying to correctly determine my prop slip on my Merc 150 setup. To date I have been assuming I have a 2:1 ratio but I see from the Merc Manual that there are also 2.3 and 1.85:1 options. Merc tell you the number of teeth on each pinion but to be fair that's not a whole lot of use if you aren't stripping the box now is it?

I suppose I could rotate the flywheel and see how many degrees the prop does but is that the only way of determining?

Thanx in advance of replies.

Courageous is offline   Reply With Quote
Old 05 September 2011, 15:19   #2
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,332
Is there a sticker on the gearbox with 13 or 12 or 14? Sometimes they put these on. The number is how many teeth the pinion gear has.

Black Dog Marine
Turbodiesel is offline   Reply With Quote
Old 05 September 2011, 15:53   #3
Country: UK - England
Town: Hamble
Length: 9m +
Join Date: Dec 2002
Posts: 2,256
Unless you know the history of the motor, the sticker don't mean shit! stick a bit of tape, or a tie wrap on the propshaft, and rotate the flywheel with the plugs out and in gear!
It is better to remain silent and be thought a fool, than to speak and remove all doubt!
Dirk Diggler is offline   Reply With Quote

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