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Re: Crank pulley wobble with new pulley and tight bolt - 98 Montero [Re: danz91crx] #1076082 01/26/15 11:08 AM
Joined: Jun 2002
Posts: 315
Ian Sharpe Offline
You might also like to take the oportunity to do what i did.

Drill out & retap the bolt hole to take a 50mm x 16mm metric fine grade 10 bolt. I made sure my bolt will never break agAIN!

97 Exceed, 3.5l SOHC auto, 4.90 gears, ARB front locker,rear Harrop E-Locker, Magnum winch, dual transfer cases also 2008 NS swb Pajero, front bar & winch
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Re: Crank pulley wobble with new pulley and tight bolt - 98 Montero [Re: Ian Sharpe] #1076083 01/26/15 03:26 PM
Joined: May 2000
Posts: 6,131
Kevin C Offline
Trail Leader
You have fretting damage on the shoulder that the timing pulley seats against. You can see it because there is a raised edge where it didn't wear that matches the slot in the pulley.

This is probably spacing the timing pulley too far back so that the damper assembly is seating on the front of the crank and not the timing pulley.

The woodruff key had worn that far.

To make your crank work, you need a timing pulley that fits flat on the rear lip and no longer drops into worn tooth pattern in the snout and gets compressed by the front pulley.

My recommendation is to replace the crankshaft.

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...
Re: Crank pulley wobble with new pulley and tight bolt - 98 Montero [Re: Kevin C] #1076084 01/26/15 05:29 PM
Joined: Jan 2015
Posts: 14
poolecr Offline OP
Need a Spot
danz, I'd definitely like to hope that things will fit better once a proper key is installed, but I am pretty concerned about the condition of that crank snout...

Ian, that sounds like a pretty indestructible setup! Depending how this all plays out I may have to consider that as well. Though so far I haven't had any bolts break. Of course, I've only driven the thing a few hundred miles since I bought it last year. I did not expect I was getting into this big of a mess. Sigh.

Kevin, that's a good point that I hadn't caught. It's even more visible in this picture:
[Linked Image]
It does appear that the wear in that direction is minimal enough that the pulley still seats onto the front of the sprocket, and not the crank- This is what it looks like fully pressed on (though not torqued, of course). The alignment is probably still garbage, though:
[Linked Image]

Your recommendation of a new crank is very much what I was afraid of. I feel as though that's somewhat beyond my current capability and equipment... Or is it not as bad as I expect? Is it possible to accomplish while the engine is still in the car?

1998 Gen 2.5 Montero w/ winter package
Re: Crank pulley wobble with new pulley and tight bolt - 98 Montero [Re: poolecr] #1104152 02/02/18 07:12 AM
Joined: Dec 2017
Posts: 19
jeffmort Offline
Need a Spot
I realize that this is an older thread but I had/have the exact same problem - wobbly balancer after installing new crank bolt.
I have a 1991 Montero 3.0 with 133,000 miles - all original. It had the "old style" crank bolt in it and after reading threads on this forum, I decided to have my mechanic install the "new/correct" style crank bolt and washer (part #11A01A022 - bolt; MR994412 - washer). During a timing belt replacement, I provided my mechanic with the new style bolt/washer and when he gave the car back to me, it had a rattle/wobble at the balancer/crank pulley. He removed the bolt and installed another bolt he had on hand (similar to the longer old style, incorrect original bolt) and the wobble went away and all is fine for now.
That said, I now have a random crank bolt that is not the original, long bolt nor is it the correct newer style bolt/washer but the car is running perfectly (no wobble/rattle).
My questions are:
1) For my 1991 Montero 3.0, are part #'s 1101A022 (bolt) and MR994412 (washer) the correct part #'s for my application? I'm pretty sure they are correct but wanted to double check.
2) The new bolt/washer (1101A022/MR994412) was installed with the chamfered side of the washer facing the bolt head - is this correct or do I have it backwards?
3) Since the car is running correctly right now with the random, non-original crank bolt, should I leave it as is and be happy?

1991 Montero
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