70 HP Mercury rattling underneath flywheel

E

esoles

Recruit
Joined
Jul 30, 2006
Messages
1
the motor runs great except for the rattling noise. What is it and how can I repair it.
Bill
 
Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: 70 HP Mercury rattling underneath flywheel

Loose flywheel due to insufficient torque on nut or partially sheared key. Upper bearing going bad. Loose stator.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,838
Re: 70 HP Mercury rattling underneath flywheel

esoles, If the motor has a distributor, the pulley cover bolt can get loose and rattle. Use some locktite.
 
E

emckelvy

Commander
Joined
Jan 16, 2004
Messages
2,506
Re: 70 HP Mercury rattling underneath flywheel

If the flywheel flex plate is cracked it'll make a sound like a bad bearing.

The flex plate can be inspected by unbolting from the center hub, just don't lose the orientation of the plate to the hub. Make some match marks or some other way of determining how it sits.

Reassemble with red Loctite on the bolts and torque to specs.

HTH..........ed
 
Clams Canino

Clams Canino

Commander
Joined
Jan 10, 2004
Messages
2,179
Re: 70 HP Mercury rattling underneath flywheel

Assunming the flywheel is good (inspect it) odds are it's the upper bearing. Make sure you have oil flow up that little hose that goes from bottom to top. If you insure that and it is the bearing making noise, it won;t get worse. Replacing that bearing is a complete teardown.

-W
 
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