If it is not marked on the case, how can I tell what gears are in it with out taking it apart.
Take the top cover off, look inside and count the gears. Then divide. That # will be your ratio.
if your drive has #'s on it they will be located on the Port side of the drive (on the Merc sticker)..you can call any Mercruiser dealer, they will be able to tell what ratio; If no #'s you'll have to take the top cover off and count.
how old is the boat,, what motor is in it, and what kind of drive,, get that and get back to me,
how old is the boat,, what motor is in it, and what kind of drive,, get that and get back to me,
The motor is HP500 the drive is Bravo XZ.
Counting the teeth and dividing will not give you the ratio. It is calculated with the lower gears as well. If you count the teeth in the upper it will be as follows:
29/27 = 1.36:1
32/27 = 1.50:1
Or you can remove the spark plugs, mark the prop, rotate the engine 10 times and have someone count the exact number of prop rotations and divide.
cant you just rotate the motor 1 time and see if the prop goes around 1.25, 1.36 or 1.50 times???? you should get pretty darn close
cant you just rotate the motor 1 time and see if the prop goes around 1.25, 1.36 or 1.50 times???? you should get pretty darn close
That is what I I'll do... Thanks
Jim
The prop rotates slower than the engine. If you rotate the engine one time the prop will rotate .666 (11/16 of a full rotation) times for 1.50:1 and .735 (just under 3/4 of a full rotation) times for 1.36:1. That is why you want to rotate it 10 times to get more accurate.
10 times at the engine for a 1.50:1 is 6.66 times at the prop and 7.35 times for a 1.36:1. Easier to tell the difference.
The XZ only comes in a 1.50:1 and 1.36:1 ratio.
The prop rotates slower than the engine. If you rotate the engine one time the prop will rotate .666 (11/16 of a full rotation) times for 1.50:1 and .735 (just under 3/4 of a full rotation) times for 1.36:1. That is why you want to rotate it 10 times to get more accurate.
10 times at the engine for a 1.50:1 is 6.66 times at the prop and 7.35 times for a 1.36:1. Easier to tell the difference.
The XZ only comes in a 1.50:1 and 1.36:1 ratio.
yea what he said??????? I think???
well I know if you leave your drive in forward and then turn motor over till prop starts to move., then mark front pulley and if it takes 1 1/2 times to turn motor over completely for prop to go 1 revolution that means you have 1.5 gears and you can figure the same for 1.26 or 1.30, these may be harder cuzz they are closer together
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