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Merc 43 belts break

W

Wyn Price

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"Having problems with belts br

"Having problems with belts breaking,pulleys all appear to be in line and alt and hyd pump turn ok, any input appreciated, Wyn."
 
"Are they wearing thru from fr

"Are they wearing thru from friction? Are one of the crank pulleys heavily rusted? Belts are too loose?

There should be no more than 1/2" deflection in the middle of a belt when pushed by your finger if the tension is right.

If the crank pulley is in good condition, place a long straight edge across the crank pulley and extend it to the alternator and the power stearing pump to see if the the pulleys are in alignment. Brackets may be loose or bent."
 
"Thanks, cobbers, they are v b

"Thanks, cobbers, they are v belts, i will check alignment with straight edge.the belts are wearing from friction. Wyn"
 
"If the alignment checks out O

"If the alignment checks out OK you may have a bad bearing or wrong belt tension.
When the engine is idling are the belts thrashing around and vibrating a bunch?
If so, I would take them off and check carefully your water pump, alternator, and PS pump bearings for smooth operation.
Has the flywheel or damper wheel been changed?
My '96 4.3 was still on its first set of belts after 10 years and 280 hours when I removed it. Never any problem.
Rod"
 
"Thanks Rod, Ifound whilst che

"Thanks Rod, Ifound whilst checking the pulleys that the water pump pulley bolts were not tight, everything else seems fine, the pump was replaced last year. Belts lok fine at idle or on revs, they only came off after being on, power for some time, Ill give it arun on the river shortly, Cheers Wyn,"
 
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