Yanmar squeaks

[STATUE]

My Yanmar 1GM10 has developed a squeak. I thought first it was the alternator.
But the squeak seems to come from the very engine itself, usually idling on cold start, but sometimes idling after running for a while.

New in 2001

 

[snowleopard]

My Yanmar 1GM10 has developed a squeak. I thought first it was the alternator.
But the squeak seems to come from the very engine itself, usually idling on cold start, but sometimes idling after running for a while.

New in 2001

The usual cause of a squeak is the alternator belt slipping under the load from a partly discharged battery.

 

[sarabande]

could also be a misalignment / tension issue of the belt and pulley.

Belt dressing as an aerosol might be a good first step ?

http://www.onlinebearings.co.uk/rocol-belt-dressing-spray-pr-16314.html

 

[Spyro]

Yes usually a belt is the reason, a couple of drips of water onto one of the pulleys when it's running will tell you if it's the belt. The squeak will change note or disappear