Summarize Crankwalk?

hello there fellow DSMers, i kno a little bit about this Crank-walk thingy in the DSMs, and i didnt get it very well from my studies. Can someone summarize crank-walk for me? thanks

Silver_GTR34

engine dies all u need to know
lol

no really
crank walk is when the crankshaft starts "walking" meaning that it moves sided to side as it spins therefore damaging the bearings and causeing one hella a headache

usually crankwalk occurs with 2nd gen DSM's with the 7 bolt motor or the late first gens with the 7 bolt engine

the 6 bolt motors are usually fine, but every motor has potential for crankwalk

the wayz you kan check for crankwalk is check for play on your cranshaft and also theres your gas pedal sticks on the floor and i belive a knocking sound

correct me if im worng bout the symptoms
but i think thats how it goes

it wouldnt be the gas pedal that sticks, its the clutch, cause when the crank is spinning and you push in the clutch if the crank is moving side to side it will be harder for the clutch plate to re-engauge while the crank is moving around!

now for a sumarization...

CW is not as common as everyone makes it out to be, it usually happens between 40-60k miles, yes it occationally happens after that but thats mostly when it happens. the reason the 7 bolt is more than the 6 bolt is mainly the oil system... 6 bolt has better and more oil points on the crank, 7 bolt does not. another thing that cause cause it is having a lot of power and a really good clutch = lauching! puting a lot of stress on the crank will jump and jerk making the crank put a lot of stress on the bearings (which is usually one of the first things to go out when CW happens then the crank starts to wear into the block, thats when your engine becomes fucked) also it is rare to see a 420a motor get crankwalk because it puts out less power due to it being a non-turbo, now in my case i am worried about that, so as of right now for my winter project i am ripping apart the block to cheak the bearings to make sure they arent wearing abnormally, and i will most likly replace then either way cause i think i am goin to get a stroker it! :biggrin: well i hope i answered your questions, and i am sure there are some other things that cause it but those are the only main ones i can think of right now, feel free to correct or add...

Jake

There are so many bible-sized essays on Crankwalk that it isn't funny. If you don't get the info you were wondering about here, search some more.. there sure isn't a lack of info on it anymore.

go here for a good definition of crankwalk

http://members.shaw.ca/costall/1000...whatiscrankwalk

scroll down to the crankwalk section

sorry try this one



http://members.shaw.ca/costall/1000Q/answers-terms.htm#whatiscrankwalk

Summary: The thrust bearing wears allowing the crank to move lognitudinally in the block.

The version with real info can be found at the RKO forums in my sig, as a sticky in the DSM section.

For some clarifications. No knocking sound, but there can be a clicking sound from the crank angl sensor killing itself. The car will usually be dead by the time you hear much of this. The carnk moves end to end, not side to side, unless the point of reference is the car and not the motor. The clutch pedal staying down has nothing to do with the crank sinning, or the plate engaging. Its because its easier for the plate to move hte crank to the drivers side of the car than push the pedal back up against the pedal assist spring. Takes some serious thrust bearing wear for this to happen. I wouldnt blame CW on the oiling system eiter. One possible, and perhaps likely cause, but there are far too many potential causes to blame any one of them. For example, 6 bolts walk too ;) But 99.99% of the time, they are fine. Same oiling systems. Making a lot of power, or launching, doesnt affect cankwalk. The vast majority of the CWed cars are stock with stock clutches and old man drivers. Auto tranny cars walk just as frequently.

Everyone really should read that sticky on RKO. I had 3 motors crankwalk, and I've built a couple myself, so I like to think i know a thing or two about it. :) Unfortunate that it happened, but it was a learning expereince.

thanks guys...hahhaha
has anyone ever found a "CURE" for this CW??

yea a new engine ;)

OK, i am planning on rebuilding my engine in the fall. seriously though, replacing thrust bearings? new crank.. anyone know if this is a possibility?

It seams to me that replacing the thrust bearings should stop or at least slow down the onset of crankwalks. I know absoluty nothing on these engines so i wouldnt know for sure. And is there any way to increase the oil flow to the crank? like a better high flowing filter or a better pump? I want a gsx but my dad says they are shit.

don't listen to your dad.... gsx's are as sweet as they come, IMO :biggrin: but i think heard that removing balance shafts help with oil pressure..