1997 Volvo VED 12B 425 Motor -- Fan Belt Problem

Discussion in 'Volvo Forum' started by midwestconnection, Jul 30, 2011.

  1. midwestconnection

    midwestconnection Bobtail Member

    39
    1
    Jun 23, 2011
    Detroit Lakes, Minnesota
    0
    I just bought the truck and the idler pulley fan belt was running on the outer edge of the pulley. My mechanic friend said I would lose that belt so I replaced the idler pulley and tensioner pulley and belt. All new for $508 total.

    The idler pulley and tensioner pulley are both smooth.

    The fan pulley is both grooved and ridged.

    The belt wants to walk off and climbs the fan pulley so I put a 1/2 inch shorter belt to try to improve tension.

    The belt was just barely getting pressure from the new idler pulley.

    It seems better But I have a little bit wobble or sway when I watch the belt on the idler pulley.

    It's staying on so far but I wish the belt were running perfectly straight with no wobble.

    Do these belts sometimes have a little bit of sway or do they generally run perfectly straight.

    Any suggestions would be appreciated.

    If it don't hold belts I have nothing.

    No belt no truck.
     
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  3. Hardlyevr

    Hardlyevr Road Train Member

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    Jul 30, 2009
    Mapleton Depot,PA
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    Alignment can be critical for proper belt tension and where the belts ride on the pulleys. If other items that the belt may turn, like AC or alternator, have had their mounts twisted it will make keeping the belts on very difficult and wear them out quicker.
     
  4. midwestconnection

    midwestconnection Bobtail Member

    39
    1
    Jun 23, 2011
    Detroit Lakes, Minnesota
    0
    Yes, I know it's serious stuff. The AC and Alternator run on a different belt.

    The fan pulley and crankshaft or cam pulley is all I have besides the ones I replaced. It's a nightmare.
     
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