Mercury 140 - Bad Clunk

[ben_and]

I own a 1979 Mercury 140 outboard, and when i put it in forward gear, it clunks really bad when going from nuetral to forward. i took apart my control unit because of some other problems, and i discovered that my control unit had been assembled a$$ backwards. Could this be my problem?

 

[NEECAPRS]

Re: Mercury 140 - Bad Clunk

I doubt that the control unit could effect the engagement severity. Even though backwards, the motor went into forward gear, didn't it? Best way to get the 'clunk' you're describing is to have the idle speed much too fast. Should be about 600 RPM, in gear and warmed up.

 

[MarineTechStudent]

Re: Mercury 140 - Bad Clunk

If you are slowly shifting gears that will cause the clunk also.

 

[mellowyellow]

Re: Mercury 140 - Bad Clunk

to isolate the problem, remove the shift cable<br />and shift the motor manually. if this solves the<br />problem, it's the cable. if not it's the l/u.<br />aslo, if idle rpms are too high, it will clunk.<br />good luck,<br />M.Y.