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Check the harmonic balancer. That is the the pulley that is attached to the crankshaft. The outer ring of the pulley, where the belt rides, is pressed onto the hub of the pulley and isolated from it by a rubber bushing that separates the outer ring (belt pulley) from the inner part that is attached to the crankshaft. The rubber will dry out and shrink as it ages and the outer ring will slide in or out (front or back), causing belt misalignment. This can cause stripping and jumping off as it doesn't provide the proper path for the belt. The new balancer is fairly easy to install, and they only cost about $60.00 USD. You need a harmonic balancer puller to remove it, but most auto parts stores will provide a loaner for the DIYer. Here is a picture of the one that goes on your Montana.....
My PT did that when my timing belt broke. It cost $500.00 to replace it. If it is broken, be ready to have some motor work done. I had to have to values replaced at a cost of $900.00. If your timing belt is not broken then check the alternator and battery. I was riding down the road and my PT shut all the way down and would not start. I had to leave it beside the road. It was my alternator. It gave me no warning.
The top small pulley backed it's self out. The problem is in most cars the pulleys are reverse threaded so this wont happen, in ours not so much. The pully spins loose with the turn of the belt so it has to be tightened way down. IT's a pain. Here is a diagram I found and You need a 15mm wrench, which doesn't just come in most sets. Good Luck
The book says "Using a 15 mm socket or wrench on bolt attaching drive belt tensioner pulley, rotate drive belt tensioner clockwise. Make sure spring keeper engages into slot." I would put a socket on the 15 mm pulley bolt and a long handle for leverage. Thats one tight spring.
that engine is built by nissan believe it or not. look on the net for your van or a nissan maxama. I just googled it and found lots of diagrams for that van(95 mercury villiger 3.0 timing belt diagram. I would not only replace the belt, I would replace it using a timing belt replacement kit.If your going to keep the van.
The 3.8 liter in the 2006 actually has a timing chain not a belt. So the chain doesn't need to replace what you may run into down the road is the tensioners having a problem as their is basically 3 chains in that engine. I would still take chains over belts any day though. thank you and enjoy, Lee
first u need to check to see if the engine is a interference motor that means if the belt breaks the pistons will slam into the valves in the cylinder head an ruin the motor...but no matter what if u dont have expert experience on timing belts u need to take this to a experienced tech..but timing belt books r availble at most auto parts stores