25 merc rattle

[RICHARD PEARSON]

rattle comes and goes at about any speed. The most anoying at very fast itle and up to mid speed. Istantly stops then will gradually start again.<br />Also will not charge. Replaced the rectifier and still no charge..

 

[WillyBWright]

Re: 25 merc rattle

See if there's any side play on the upper crank bearing by grabbing the flywheel (motor not running) and pushing it back and forth. There should be virtually no movement. Then turn the flywheel back and forth. There'll be some slight knocking sounds, but it shouldn't be much.<br /><br />Must have a bad stator. Remove the yellow wires from the rectifier and check for continuity. I don't have the spec, but if there's continuity between the wires, it's probably good. Unless it's shorted to ground. Next test is to see if there is any continuity between the yellow leads and ground. If there is, it's bad.

 

[RICHARD PEARSON]

Re: 25 merc rattle

I get a very slight clunk when moving the flywheel up and down[end to end] <br />none sideways. I put over 60 fast miles on this motor this weekend up the Calosahatchee, sometimes over 25 mph. I gets no worse. What about some exhaust tubes ??? Someone mentioned that to me.?? Is there such a thing??

 

[jeremyjustin]

Re: 25 merc rattle

i have same problem with 2002 40h mercury that i bought last week

 

[jeremyjustin]

Re: 25 merc rattle

When I bought the motor I had to clean the 3 carbs now it has the same rattle I can not hear it at idle but is bad when I start slowing down . Sometimes when running half throttle it hesitate and will rattle then.