2G Random crankwalk

[Connor Wilke]

The question I'm asking is about crankwalk, and yes I know ow there a other threads out there but nothing like what I'm experiencing. So what I'm asking is where to look for trouble shooting more.

With that being said, I have a 98 gst. The motor is freshly rebuilt and has only idled and never driven.

The current issue I'm having is with crankwalk. The motor was assembled in a clean and clear space, bearing measurements within spec and everything torqued correctly. No oil leaks or anything of the sort. Motor has great oil pressure at idle with (5w-30) oil. However the crankwalk I'm experiencing is confusing me because like the typical symptoms of pushing the clutch in and rpm drops but it's very random and no l consistency with the rpm drop to the point where I don't know how to replicate it, it has a mind of its own.
So the question I'm looking for is if this is something anyone else has experienced with (crankwalk) coming and going randomly. Would running a 10w-40 help with possibly getting more oil pressure to the thrusts to prevent it?

 

[DSMPT]

When assembling the motor last time I believe the end play was wayyy more than what I'm getting now. I think the crank moved a bunch.

You were at the beginning of crankwalk for some reason. And that's what you have to fix, not the number of end play. You now got less end play with new bearings because the thrust bearing is not worn yet.

What I have done is very unconventional and slipped a new set of bearings. Upon doing so I double checked all bearing clearances again after installing a brand new set of ARP main studs and the mains have exactly .0002in on all bearings.

Actually many people have done that in the past and found out that it won't solve anything, just bandaid. You should inspect all parts and find out the cause why it occurred, and fix it. And also you installed the ARP main studs without line honing the main journal, that's not a good idea neither.

I don't really want to discourage you but I still recommend you to rebuild properly if you want the engine live long. Otherwise it may occur again. I am telling you this to save your money and time, but the decision would be yours.

 

[chrysler kid]

no, oil weight wont solve your problem. zinc additives can slightly alter the dyanamics of wear on metal to metal, but they wont stop your engine from chewing bearings

you keep saying crank walk is causing this, but you have trashed main bearings. your issues could just as easily be caused by the crank rotating assembly having resistance to rotation not caused solely by thrust bearings.

you keep saying its a rebuilt motor but list no specs. did you have the crank balanced and mic'd? did you have the block tanked to remove previous debris? are you using a new oil pump? what does "fully rebuilt" mean to you?