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Re: oversised cranckshaft pulley
All parts tied to that pulley would rotate slower .dont know if 4% would have any undue affect on water pump flow or alternator outputs.I dont believe so but keep an eye on temp as it may circulate a little slowerr so it stands to reason it may run warmer.Alternators put out a predetermined amount of power dependant on the speed they are spinning .doubt it would be unduly affected
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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.....
No, you do not want to replace the crank pulley with a solid one. The hub is also know as a Harmonic Balancer. The explosions that happen inside of your engine cause vibrations or harmonics, the balancer greatly reduces these vibrations. Without the ruber insulating ring the harmonics can cause part failure at certain frequencies.
it is on the back side of the timing cover driven by the cranckshaft, the repair kit is about $50 , it takes a good solid 4 hr to replace, must remove the radiator and front cross member on top of radiator and headlights.
I am not familiar with a Nissan, but most pulleys are pressed on the crankshaft. You have to use a puller to get them off. AutoZone rents tools for this, basically you leave a deposit and get your deposit back when you take the tool back. Please rate my answer so I am rewarded points for it.
It sounds like one of your accessory drive pulleys has seized up. Check every pulley by hand except for the bottom (crankshaft) pulley. With the belt off, attempt to turn each pulley in the clock wise direction. Next, carefully examine the belt tensioner pulley. Look for signs of burning rubber on any of the pulleys. If you run across a pulley that you cannot turn by hand that appears to be frozen solid. (except for crankshaft pulley), then that accessory might be seized. The AC pulley is a good place to start. The belt tensioner pulley is another problem area to check. If you cannot locate the problem by using this method then post a comment to let me know and I can tell you how to check for that problem using a replacement belt and a timing light. I hope that this information will be helpful to you.Thank you for using Fixya.com.
Trust me, you DO NOT want to replace your balancer with a solid piece. The rubber in the original serves to dampen firing pulses and crankshaft twist. With a solid balancer the engine will shake itself to pieces even if you don't feel it. DON"T DO IT!!! I know a lot of Mitsubishi forums and resellers push the solid balancers, but they are dead wrong. The rubber isolated balancers are made that way FOR A REASON! If you insist on continuing, yes, the engine will spin when you tighten the bolt if you use a wrench, but should not affect timing if the belt is installed properly. Best way to tighten the nut is with an air impact gun. If it's a manual trans car, put it in gear and have someone stand on the brakes HARD while you tighten the nut. If the belt is off the car, and the balancer moves, you will have to realign ALL the timing makes, a VERY difficult job on a 3.0 Mitsu. I know, I own one!!! An alternative way to lock the engine from turning is to insert a bolt and nut between the cam gears. I can't remember what size I used, so it may take a bit of trial and error. A couple pieces of duct tape on the bolt will keep it from gouging the cam gears.
do you mean crankshaft pulley? i dont know of a cam pulley on these.
if so replace the whole thing. the rubber on these go bad and rip away from the pulley. it happens. Just get a new one. should be a press fit one. may need a pulley puller. not the JAW type, but the 3 bolt type.