My serpentine belt keeps breaking (shredding)

JOESKI62

MEMBER
1995 FORD F-150
280,000 MILES

My serpentine belt keeps breaking (shredding). I've changed the Tensioner Pulley but I'm on my fourth belt. I notice my crank shaft pulley is moving up and down while running. Should my crank shaft pulley run true and smooth or is the movement from the harmonic balancer. What can be causing my belts to break?

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Did you replace the tensioner or just the pulley?

The balancer should be true running

Roiy

Was this

answer

helpful?

Yes

No

+1

Wednesday, April 10th, 2013 AT 10:16 PM

JOESKI62

MEMBER
3 POSTS

I changed the whole tensioner assy. Now my belt keeps jumping a tooth on the crank shaft pulley. My Harmonic balancer is behind the crank shaft pulley so if its not running true I should change the balancer?

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Wednesday, April 10th, 2013 AT 10:30 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Thats correct

Roy

Was this

answer

helpful?

Yes

No

Wednesday, April 10th, 2013 AT 10:32 PM

JOESKI62

MEMBER
3 POSTS

I was told there would be play because of the rubber bushing on the balancer which didn't sound right to me. I know what I'll be doing this weekend. Thats the last thing I have left to change. Thank you for your quick response

Was this

answer

helpful?

Yes

No

Wednesday, April 10th, 2013 AT 10:50 PM

ASEMASTER6371