Loose or Broken Crankshaft Pulley Bolt on Mitsubishi Montero

The crankshaft pulley bolt may become loose or break causing loss of power steering operation and other related engine accessories. Some of these vehicles may be involved in a recall for this issue. Our technicians tell us that an updated bolt may be available. Replacing as necessary and properly torquing the crankshaft bolt will commonly correct this issue.

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Average mileage: 164,399 (80,000–275,000)
Engines affected: 3.0L V6, 3.5L V6
17 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
45 people reported this problem
20 people shared problem details
1996 Mitsubishi Montero- 3.0L V6200,000
the roll pin holding the crankshaft pulley to the timing sprocket broke, probably due to loose crank bolt.
This same problem happened to me when I bought the truck at 196000 miles for $600 bucks, and a thousand miles later the crank pulley pin sheared too, twice in little less than a thousand miles. The last time I was stranded in a busy intersection with my wife and daughter. To those out there experiencing the same problem try this, try to drill a second pin hole in the pulley at the same exact location but in the opposite side of the first pin hole, and instead of having one pin you now will have two pins holding the crank pulley. One on each side of the crank pulley,so that crank pulley can stay locked in place, but make sure you use the strongest thread locker.I think I have figured it out. This is just my idea to do it my self, but you can talk to a mechanic and see what they tell you. I am about to do that to my crank pulley hope I fix it for good, and I hope you too. 01/17/14 Eddy
2000 Mitsubishi Montero- 3.5L V6145,000
2001 Mitsubishi Montero- 3.0L V6156,000
crankshaft pulley loose and wobbling, mechanic says this is very expensive to fix if can be fixed at all. Many have this problem- please report if you do because this should be a recall
1995 Mitsubishi Montero- 3.5L V6190,000
Loose crankshaft pulley bolt
1997 Mitsubishi Montero- 3.5L V6
This is the second time the crankshaft pulley bolt has sheared off in the engine. I don't know why it keeps happening.
1996 Mitsubishi Montero- 3.5L V6190,000
bolt came loose on the crank shaft leaving me stranded at the store, sheared the roll pin, now im on my way to the junk yard to find another one,
1996 Mitsubishi Montero- 3.0L V6190,000
Crank bolt got loose and caused the harmonic balancer to sheer the roll pin that holds it to the sprocket. It also wore out the inside of the balancer. Replacing balancer and pin and re-torqueing bolt to spec.
Original Crankshaft Bolt broke. Symptom: Engine Temp was slightly higher than normal, strange noise up front. [NOTES: First, I removed the Fan Blade. Then, the Radiator. Then the Fan Belts in order to gain access to the Harmonic Balancer & Crankshaft do this. I did not use a lift.] Drilling out the original (RECALLED in '2001) Bolt. Used a *Left-Hand Drill Bit* & the broken piece came out. NOTE: Made a "Tap Guide" out of some nuts, so that I could drill in the center of the Bolt (& perpendicular too). Don't be in a hurry with this! Take your time. Use some Cutting Oil (Harbor Freight). Purchased the proper (new type / design) from a Mitsubishi Dealer ($16.00) with Washer. IMPORTANT: Get Torque Spec. from Dealer, or on - line. This is *very* important. REPLACE THE Harmonic Balancer (I.D. hole was messed up...replace yours too. After - Market Brand / make worked fine for me.) Also a new Shear Pin, etc. I did this 2 1/2 yrs ago in my own garage. And I'm not a car mechanic, but I know how to read & use tools. So don't get discouraged on this one. Give it a try! I think it ran us about $140.00 total to complete this repair. At 18,000 mi. later, it's still running fine. MH / Rochester, NY
1993 Mitsubishi Montero- 3.0L V6159,651
As I was driving vehicle, probably around 45 miles and hour, Crankshaft center bolt pulley broke, making vehicle hard to steer and a loud noise from engine compartment, the Crankshaft pulley got tangled in the belts, therefore it did not get damage, bolt broke and I have to figure out if I can remove it or have the engine professionally overhauled.
2002 Mitsubishi Montero- 3.0L V6160,000
The first time it happened, a mechanic welded the harmonic balance to the motor. Second time used a different mechanic and he showed me what the first guy had done. Now it has happened again, but I lost the entire part plus the bolt. My dilemma is now finding the size bolt that goes to the crank shaft.
2002 Mitsubishi Montero- 3.5L V6140,000
harmonic balancer bolt loosened --> $1200 repair --> occurred again 15,000 miles later with added complication of stripped crankshaft --> vehicle scrapped.
1997 Mitsubishi Montero- 3.5L V6239,000
Broken bolt. Drill out and replace
2001 Mitsubishi Montero- 3.5L V6160,000
Bolt came loose, pin sheared ,then i ground down end of crankshaft sprocket that harmonic balancer bolts on to('cause i drove around asking pep boyz auto zone part guys guys what was wrong. duh ?)
2002 Mitsubishi Montero- 3.5L V6125,000
pulley slipped and sheared the roll pin. where do I buy another one?
Harmonic balancer bolt came out and balancer flew off motor on freeway. Had to buy new one. Installed and now loose after 2 days again. Looking for permanent solution.
2001 Mitsubishi Montero- 3.5L V6200,000
roll pin sheared (twice) causing bolt on harmonic balencer to loosen
Crank bolt came loose and almost blew the engine and harmonic balancer. cost me $1,300 to fix
bolt detached and shaft is stripped. Need info on how to recoil bolt/shaft to reattach bolt.
2001 Mitsubishi Montero- 3.5L V6151,000
crank shaft pully came off i took the car to a shop they charged me 1300 dollars to replace it then less than a 1000 miles later it came off again the shop said they will fix well see
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