The crank bolt is 2.03" long now, ARP says it was 2.47" originally. .44" doesn't seem like that much to drill through, but on the other hand, the bolt is really dense, and it is ~1" into the crank where it broke. I talked to the PO - he tapped the crank for the ARP bolt (its a small block chevy, 13/16" bolt). So I'm definitely not going back to the updated Mitsubishi bolt.

I've drilled out exhaust studs and stuff (from motorcycles, mostly), but this seems like quite a bit deeper and far more exacting than those. And if the ARP threads on the crank are damaged (which I think they are, but its possible that the shavings were mostly from the broken bolt, but that seems unlikely/overly optimistic), I'm going to have to figure out something to do with them, too.

The truck has 212k on it and is largely in good shape (sun faded, the leather has a rip or two, rear gate doesn't lock electrically, seems to need a new sunroof motor, but all minor issues). I'm a field biologist and would be using it for longer camping/fieldwork trips - the 22re 4runner is great for short trips, but the noise, sitting position, and slow speed really wear on me for longer trips (and my gf doesn't like driving manual). I was really happy with the Montero for all but the last 1/2 mile of the 800 miles that we were together...

I see my options as:

a) buying a right-angle drill, left-hand bits, and trying to extract it (make some sort of guide - make a really nice punch exactly in the center, working from small to bigger very slowly) - I've already bought the balancer pulley and can buy the ARP bolt. If the threads aren't that botched and I can get this out, this costs me a few hundred bucks for the drill, new timing sprocket, extractors, etc. If the threads are all botched, then I figure out some sort of helicoil thing (as its already widened and tapped beyond the stock bolt).

b) towing it to a machine shop (AAA), having them extract it, tap it, and make sure everything is balanced and good. This would cost more (potentially much more), but take less time (potentially FAR less) and give me some peace of mind.

c) buy a cheap SR on CL (there are two less than $1500 near me), go through their engine on the bench (do timing belt, valve seals if needed, etc.) and swap it into mine. This would cost more, but I could recoup some selling parts. Both are high mileage though (and compression testing under the intake does not look easy).

d) have a shop rebuild my engine (or at least go through it and change the crankshaft, etc.). This would cost the most, but give me the most peace of mind.

e) buy a used or JDM engine. I don't particularly like this option (option [c] would be better, as I could get some of the money of the truck back, and have a used engine).

I really wanted to take this rig on a big trip in late June/early July, but I've got a dead reliable 4runner which I can certainly use.

I guess I should also add that I'm a decent mechanic - I've not done engine rebuilds (except on 2 strokes, which don't count), but I've done timing chain changes, etc. I don't have particularly good work space, but its not that bad either. I'd prefer not to have an immovable hulk lying around, but that's not the end of the world, either.



Attached Files
crank bolt.jpg (402.13 KB, 2 downloads)
sprocket.jpg (297.12 KB, 2 downloads)

'95 Montero SR, '89 4runner