Question about 1997 Pontiac Trans Sport

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Need name of big slick pulley on top and to the front of motor

Replaced belt, and when started engine the top pulley(which is smooth and shiny would not turn. is this an idler pulley and if so can i get it at the parts store. what would be the name for this pulley?I know it is not the steering pump, the a/c comp, or oil pump.

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Yes, it is the idler pulley and yes you can get the replacement part for it. The bearings are toast.

need name of big slick pulley on top and to the fr - 3590b56.jpg

Posted on May 21, 2009

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    Greg Bernett May 21, 2009

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It' an idler pully. The parts stor should have it.

Posted on May 21, 2009

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On the front of engine there are pulleys that the serpentine belt is on, take the belt off. Next depending on vehicle either go underneath or stop and on the crank pulley (big one on bottom) will have lines on the pulley. There is also a mark on the engine block, using a socket you can align these markings to get the motor to TDC (top dead center), this allows your engine to fire on cylinder #1. Should only really need to do this when replacing the distributor, or fixing the timing!

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Instructions

Things You'll Need
3/8-inch drive breaker bar
Metric sockets
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1 Open the hood and inspect the flat surface on top of the plastic fan shroud for the belt routing diagram. Follow the diagram instructions to route the new belt.

2 Locate the serpentine belt self-adjusting tensioner on the front of the engine block. The tensioner has a pulley on the bottom of the tensioner arm, which the belt travels under. The tensioner can only be rotated from the bolt that secures the pulley to the tensioner arm.

3 Rotate the tensioner in a clockwise motion with a metric socket and the breaker bar to loosen the tension from the belt. Then, pull the belt off the top of the tensioner pulley. Release the tensioner pulley and pull the breaker bar off the pulley bolt.

4 Pull the belt out of the accessory pulleys. Then, slide the belt around each fan blade and out of the engine bay. Rotate each fan blade to the top side of the engine to get the belt around each fan blade.

5 Match both the new belt and the old belt together to make sure that the new belt is the correct size. Then, route the new belt around each fan blade and around the crankshaft pulley. The crankshaft pulley is the big pulley at the very bottom of the engine.

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When I raise the hood and with motor running looking to my left there is a belt running and a squeaking noise at idle coming from that area. The van is front wheel drive so motor sits in there sideways.


Has it just started with cold weather? Does it squeal at first then as the engine is revved, stop squealing.

If so its probably your alternator belt has worked loose and needs tightening. I'd check this out first, if you've not done it before ask a friend with some know how for guidance. But as a guide, there should be about an inch of give when flexed on the longest run between 2 pulleys, if more then probably needs tightening. If more than a couple of years old, replace with a new one.

If it still squeals after tightening/replacing, you could have a faulty water pump bearing or pulley bearing. Either would require replacement to pre-empt catastrophic failure and resultant engine damage.

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Make a simple drawing of the routing of the belt. or try to take a digital picture for reference on installation. Typically, one side of the belt has groves, and the other smooth. The pulleys will be grooved or smooth to match the side of the belt they are supposed to contact, don't put the grooved side of the belt on a smooth pulley or vise versa. There should be an "idler pulley" which applies pressure to the belt to keep it tight. This idler maybe manual or automatic. A manual pulley will usually have an adjustment bolt running perpendicular to the pulley face. You will loosen the bolt in the middle of the pulley a bit, then loosen the adjustment bolt until there is enough slack in the belt to remove it from at least one pulley, the the whole belt should be easy enough to remove, barring any engine mounts in the way. If an automatic (Sprung) tensioner is used there is usually a way to get a 3/8" or 1/2" drive breaker bar onto the pulley and actually "flex" it so that the belt tension is relieved. You will need to hold pressure on the tensioner until the belt is removed from a pulley, this may take another set of hands. Installation is the reverse of removal. Old automatic tensioners can sometimes get stiff, may need to be replaced, or removed and lubricated until it actuates smoothly. Check all the pulleys very carefully to insure the belt is aligned properly, before starting the engine. many a belt has been destroyed when someone started the engine with belt misaligned. Have fun.

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I need a diagram of a 2004 suzuki forenza Serpentine Belt


That's easy, there are some pulleys with ridges to grip the underside of the belt, and some are smooth for the top side of the belt.
I can only assume your belt broke and fell off so you couldn't see how it was on prior. But either way you have limited length, and the last place you would be routing the belt is the tensioner, which you should have located first, so you can have a wrench handy to fit it.

Here's what you have:
Top left= alternator (small ridged)
top right = power steering (large ridged)
Bottom right = AC compressor (large ridged)
Bottom middle = Crank Pulley (large ridged)
In middle next to Power steering = Tensioner (small shiny smooth)

Remove the air cleaner housing (two bolts)
Start on left top side and loop belt (clockwise) across the alternator to the power steering down to AC (also clockwise from right to left) then over to crank pulley (from bottom clockwise around to top of pulley) to tensioner (smooth, belt is backwards on it) which will go back up to the alternator.

At the top middle there should be a sensor protruding from the timing cover that the belt passes under as it connects between the alternator and the power steering. And you won't easily be able to fit anything besides a box-end wrench on the tensioner, so you may need some kind of extension on the wrench to get good torque on it without hurting yourself.


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1 Answer

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You need to inspect your Serpentine Belt. That is the ribbed belt <see diagram below> that is driven by the engine's Main Pulley at the crank (generally, lower part of the engine). The smooth side usually drives the water pump, while the ribbed side drives the alternator, power steering pump, and air conditioning compressor. Inspect this belt and look for obvious signs of oil (slick stains) that have dripped onto the belt from another part of the engine. If you have oil stains, then you will need to get the source of the oil leak fixed before replacing the belt because you would otherwise be throwing money away as a new belt would soon experience problems due to the oil leak. If no oil leak, check for obvious wear on the belt by looking for BIG cracks that are penetrating through to the smooth side of the belt, cracks parallel to the smooth side of the belt, or chunks missing from the ribbed side of the belt <see diagram below, though the bottom diagram shows cracks perpendicular to the backing that are normal/acceptable; Parallel cracks soon become chunks missing from the belt>

badbelt2.gif If your serpentine belt is cracked or has chunks missing, it needs replacement.

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This is a fairly straightforward mechanical procedure. If you will allow me to provide a little perspective first, just so we start on the same page.

Since you ask only for the procedure for replacement, I do not want to jump over the diagnostic element of this process. If you are holding a broken belt in your hand you can skip directly past this paragraph. The serpentine belt, referred to as the engine drivebelt does what fan belts did in the "old days". This belt is by the crankshaft and in turn spins the alternator, the water pump and the pump for the power steering and the air conditioner compressor. This belt is a wear item and should be examined once per year. The belt is smooth on one side and has ribs running long ways on the other side. Using a flashlight check for shiny areas, cracks of any kind or fluid on the belt. Any of these, change the belt.

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