crankwalk issue

[IronEagle]

Well any engine can crankwalk as I have heard of Supra inline 6's with the problem but the 7 bolt 4G63 that ran from mid 92-99 are known to have had many thrust bearing problems. My 95 TSi has been lucky so far but it was a one owner car ordered new by a 40+yr old musician who did all the service/oil changes etc.

Mitsubishi claims MY99 was a "resolved year" but I know of one 99 MY GSX owner whos 7 bolt walked.

98/99 motors are much less likely to crankwalk, however not as unlikely as a 93-94 block.

the 95s are the next "most likely"
then 96s,

then 97s win the "most likely to crankwalk award"...

Someone on dsmtuners compiled a veritable ton of information on crankwalked engines... 97s made up a Huge portion of the overall number of cases.

6 bolt 4G63's were from 89-mid 92. A 6 bolt 2.3 liter in a 2g FTW IMHO.

We have tried every trick in the book. If it is going to walk, it is going to walk. We put one together with a 95 block and did some tricks to it. Before we pulled it from freeze plug issues it had over 15,000 miles on it. We finally put it back in and the machine shop bored it, line bored it, turned the crank and some other stuff. Walked in 5 miles. Same block same crank. We had even more tricks for it as well. Even had a locals so called "crank walk fix" plus all of our stuff. Tried a few more secrets and put new bearings in it, walked in 1/2 mile. Probably walked as we were adjusting the clutch. Some walk some don't. Finally put the aluminum rod six bolt in. No troubles. That is until we break a crank. Just go with the six bolt and be done. We even tried a new design motor, 1G 7 bolt, they all will do it eventually. Damn mitsubishi. Evo's don't do it(Evo 1-9). Fuckers. We did everything we could to keep oil on the bearings, from cutting the bearings, cutting grooves in the bearings, drilling holes in the oil journal and matching a hole in the bearing, with and without oil squirters, chamfering oil holes, adding material to the block and crank via nitriting. 7 bolts blow.

Steven

But it isn't the only Mitsubishi engine with the issue. The 6G72 in the 3000GT VR-4 and Dodge Stealh R/T Twin Turbo were also designed with small bearings and bad oiling.

[stealthrt]

But it isn't the only Mitsubishi engine with the issue. The 6G72 in the 3000GT VR-4 and Dodge Stealh R/T Twin Turbo were also designed with small bearings and bad oiling.

Crankwalk in the 6G72 is very rare, and not a problem anyone in the community is very concerned with. It does happen as it could happen in any engine, and it did actually happen to me. But the same time, I spun all 6 rod bearings, bent 12 valves, cracked 3 pistons, and spun several main bearings. Needless to say, I fucked that engine up.. LOL

Anyways, on the 6G72 we just have a horrible oiling system that causes rod bearings to spin like crazy.

Back on track.. the only thing I know about crankwalk is one simple way to help prevent it is to NOT use your clutch when starting the car. Expecially with the use of an aftermarket pressure plate, you will put excess unneeded pressure on the thrust bearings.