The belt is on but the vehicle still won't start because the tension isn't tight
SOURCE: serpentine belt tensioner will not tighten
If the tensioner will not keep the belt tight then the tensioner is bad and will need to be replaced. The spring on the inside will loose it's tension over time.
SOURCE: Squealing Smog Control Belt in Humid Climate
I will list some of my experiences with similar problems.
V-belt quality and grade vary a lot and I do mean a lot. Belts can take a set from sitting--anybody with a table saw will attest to this. I would try a new belt first after finding a good parts man. A good alternator shop (rare today) can help here. The smog pump belt is an easy one to change. Try the cheap stuff first.
Smog pumps in my experience do not need a lot of power, especially at idle, but I have had bearing and pump failure on several wipe out a belt. Pull the belt and spin the smog pump by hand.
Belts can glaze and it is not necessarily noticeable. Stamped-steel pulleys polish smooth and won't transmit the power needed. Pulleys can also wear in some strange shapes so a new belt does not fit properly. See if an alternator shop has a cast iron pulley for the alternator. Cast iron does not polish smooth and also wears off any glaze from the belt surfaces. The crank pulleys are stamped-steel but are larger in diameter with a longer wrap angle so slippage is not a problem there.
In my poor days I tried sanding the belts and pulleys to remove the glaze. Too much work and it was only temporary.
I have used a cast iron pulley on a 110 amp alternator with a winch load. A stamped-steel pulley would just smoke the belt when under load (winch drew 225 amps total!). My truck is 70 amp and that is the biggest alternator Ford has with a V-belt that I know of.
I considered removing my smog pump and associated hardware. My experience has been to leave everything intact unless I can replace everything with an earlier, non-smog engine. Doing everything piecemeal has just caused other problems.
Hope this helps.
SOURCE: how do i tighten the belt tension after i have
The same way you took the tension off the belt to get it off is the same way to put it back on.
okay!all you have to do is put a rachet on the bolt with the proper size socket and pull the tensioner while you put the belt on then you let go and the spring will pull it back tight.
If this is not happening then you need a new tensioner.
SOURCE: 2006 Nissan frontier 4 cylinder belt diagram + tensioner pulley
They are under the hood or on the front crossmember.
Regards,
matt
SOURCE: how can i tighten the tensioner pulley for my 1996 eclipse
the tensioner pulley is spring loaded to maintain proper tension constantly.if your belt is loose cracked or frayed,replace it.if tensioner isn't working,replace tensioner assembly.
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