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Should prop "not turn" in reverse by hand?

H

Howmaster

Member
I have a 2002 mercury 40hp (0T571672)
With motor Off....
Forward....prop turns engine hard one way and clicks the other.
Nuetral....prop spins freely both ways, smooth as silk....
Reverse....prop turns engine hard both ways!
(is that right for reverse? If it is how come??)
 
In reverse the clutch is held in mechanically and in forward the clutch is held in with a spring. It is working as it should. Do not turn the engine over with the prop it will bend the impellers backwards and the water pump will fail.
 
In reverse the clutch is held in mechanically and in forward the clutch is held in with a spring.
Click to expand...
Spring loaded clutch dog has nothing to do with prop locking in reverse as its gear design. The forward gear is ramp style and reverse gear is lug style....that why you hear the ratcheting noise if you suddenly chop throttle and some Johnsons use the same style ramp/gear set up and nearly are all mechanically held in place. As noted this is normal on nearly all inline Merc engines....
 
Last edited:
faztbullet said:
Spring loaded clutch dog has nothing to do with prop locking in reverse as its gear design. The forward gear is ramp style and reverse gear is lug style....that why you hear the ratcheting noise if you suddenly chop throttle and some Johnsons use the same style ramp/gear set up and nearly are all mechanically held in place. As noted this is normal on nearly all inline Merc engines....
Click to expand...

Good you agree with me that the spring holds the clutch dog into the forward gear and the shift cam pushes the clutch dog into reverse. I thought for a second I got that wrong. Thanks
 
What I meant is it don't matter how clutch is shifted that has nothing to do with how its held in gear,,,it the way/design or gear ramps that hold it in gear
 
His question was why it ratchets and that is because the clutch is spring loaded in forward gear. Some of the older mercs had the ramp type clutch on both forward and reverse but the prop would not ratchet in reverse because it was locked in place by the shift cam.
 
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