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.

RepairPal Verified
Average mileage: 174,750 (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
44 people reported this problem
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
Viewing 1 - 20 of 25 problem details
1996 Mitsubishi Montero - 3.0L V6 200,000 mi,
the roll pin holding the crankshaft pulley to the timing sprocket broke, probably due to loose crank bolt.
2001 Mitsubishi Montero - 3.0L V6 156,000 mi,
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
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 V6 145,000 mi,
BOLT CAME LOOSE SHEERED ROLL PIN. DRILLED OUT OLD ROLL PIN REPLACED WITH NEW BOLT AND PIN. NOTE: ADD BLUE THREADLOCKER TO NEW BOLT AND USE REVISED TORQUE SPECS. .
2002 Mitsubishi Montero - 3.5L V6 125,000 mi,
pulley slipped and sheared the roll pin. where do I buy another one?
1997 Mitsubishi Montero - 3.0L V6 205,199 mi,
On my 97 montero ls 3.5L, my harmonic balancer has alot of slop in it and the bolt holding it on it tight. I have no way of removing that bolt. Any suggestions?
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 V6 190,000 mi,
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,
1999 Mitsubishi Montero - 3.5L V6 130,000 mi,
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
1995 Mitsubishi Montero - 3.5L V6 190,000 mi,
Loose crankshaft pulley bolt
1996 Mitsubishi Montero - 3.0L V6 190,000 mi,
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.
2002 Mitsubishi Montero - 3.5L V6 140,000 mi,
harmonic balancer bolt loosened --> $1200 repair --> occurred again 15,000 miles later with added complication of stripped crankshaft --> vehicle scrapped.
1990 Mitsubishi Montero - 3.0L V6 203,800 mi,
After replacing the AC compressor and the three belts and then driving for a bit, the power steering went out on a left turn and the alternator light came in. After trying to put the alternator belt on once I saw the pulley was loose. I thought it was the rubber bonding at first. Now I have to find a way to get the broken roll pin out of the crank and get it replaced. I see the recall. I might as well see if I can get the bolt too. Good grief.
2004 Mitsubishi Montero - 3.0L V6 137,000 mi,
Heard a clinking sound under the hood, it appeared it had thrown a belt (no power streering, battery light on) I shut off the a/c and the sound went away. I assumed it was a bad tensioner that let the belt slip off. Drove it slowly a few miles to my mechanic and on inspection found the crank pin had sheared and the bolt had become loose. The balancer had obviously been spinning on the end of the crankshaft. In trying to remove the bolt the threads stripped and now I'm waiting to get his recomedation on a fix.
1995 Mitsubishi Montero - 3.0L V6 258,774 mi,
Harmonic balancer bolt came loose shred the roll pin bolt not broke
1995 Mitsubishi Montero - 3.0L V6 201,100 mi,
crank pulley bolt came lose, sheared the pin... got lucky and saved it before it broke the timing belt or the bolt.
1993 Mitsubishi Montero - 3.0L V6 159,651 mi,
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 V6 160,000 mi,
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.
1997 Mitsubishi Montero - 3.5L V6 239,000 mi,
Broken bolt. Drill out and replace
2001 Mitsubishi Montero - 3.5L V6 160,000 mi,
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 ?)