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#1
10-03-2006, 03:56 PM
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Crankwalk cause
I dont know if this holds true in all or any dsms but I know what caused mine to walk. Well I know why it walked but not what caused it to walk. The thrust bearing was worn down to pure copper and that is what gave it the extra end play causing it to get a funky crank signal causing it to run like ass
 BTW all I need to do is time the motor and its ready to be dropped back in
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 2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods:  
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#2
10-03-2006, 04:55 PM
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Re: Crankwalk cause
Good luck, hope that what is it.
__________________
GM FOR LIFE !! NEW 1997 Camaro z28 6 speed illa never going back to import  , but killa alway be nice to any DSM he saw looking for 2002 Trans Am LSX UPGRATE 2010 !! 97 Camaro Z28 95 camaro lt1 1992 Pontiac Firebird v6 auto -sold - Pony 1998 Mustang GT 4.6L Manual. Black 1995 Eagle Talon TSI AWD Turbo manual R.I.P 1994 Mitsubishi Eclipse Manual gray -Sold 1997 Mitsubishi Eclipse RS Auto White - Sold
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#3
10-03-2006, 05:10 PM
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Re: Crankwalk cause
Thank you captain obvious!
 Ha ha, just playin Scott. Now you would be a popular man if you could figure out why there wasnt sufficient oil there causing the bearings to get worn down that far.
__________________
 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#4
10-03-2006, 05:23 PM
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Re: Crankwalk cause
I didnt think it was that obvious :P I hear alot of people saying how it fucks up the block and that its the cranks fault and such. I'm going to take the bearings to school tomorrow and see if between my teacher and I we cant figure out the cause
__________________
2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods: Last edited by blk_srt; 10-03-2006 at 06:56 PM.
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#5
10-03-2006, 09:58 PM
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Re: Crankwalk cause
From what I have gathered, CW is another name for "thrust bearing failure" and the most likely (or definately) is caused by lack of oil on the thrust bearings surfaces. We just dont know why theres not enough oil getting in there.
__________________
Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#6
10-03-2006, 10:07 PM
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Re: Crankwalk cause
Thats what I've always thought also but I've been told that I'm wrong so I guess I should go back to those people and tell them I'm right...I couldnt think of anything better
__________________
2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods:
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#7
10-03-2006, 10:33 PM
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Re: Crankwalk cause
From what I have read lately the 2g oil squirters suck...and get clogged really easily...or also the oil pump is clogged and you dont get enough oil pressure...have you read the write up on Magnus Motorsports...that was the most in depth article that I have read on the subject....here is the link... http://www.magnusmotorsports.com/tech/crankwalk.htm
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1998 Eclipse GSX 6 Bolt swap MHI Big 16g FP Race Manifold Apex'i N1 Cat-back Apex'i N1 Downpipe Walbro 255 fuel pump GReddy Type S BOV Turbo XS Boost Controller Balance Shaft Elimininator ACT 2600 RRE 11lb No Name Flywheel Prothane Motor Mounts Tokico Illuminas Advanced Handling Kit RRE Front and Rear strut tower bars RMDSM Front and Rear Sway Bars TRE Stage 2 Tranny ARP Head Studs, Main Studs, Rod bolts
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#8
10-04-2006, 10:45 AM
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Re: Crankwalk cause
There are lots of theories on the cause of "crankwalk" (thrust bearing failure)... but no definites, and no one has taken the money/time to diagnose/cure the problem... most people will just swap the motor...
Any car (not just 2g DSMs) can experience thrust bearing failure... Here are a few links that address this problem and offer some diagnosis/possible cures (not DSM specific) http://www.aa1car.com/library/2003/eb50331.htm http://www.gnttype.org/techarea/tran...n/trantsb.html
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Quote:
1991 Eagle Talon TSI - Broken  Head removed, block broken, trans in hatch  1991 Eagle Talon TSI AWD- in pieces 3" exhaust, rebuilt bottom end  Project: Assemble the Eagle is underway... and now with AWD 2003 Lancer Evo 1630hp/1593ft lb tq
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#9
10-04-2006, 02:42 PM
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Re: Crankwalk cause
well if the oil squarters fail... i guess a regular 15K miles engine flush would be worth while? thats what i've been doing anyway... just to keep shit in the motor as clean as possible...
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#10
10-04-2006, 03:49 PM
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Re: Crankwalk cause
I really dont think it has anything to do with that. 1. because the bearings get pressurized oil from the crank and 2. not all cars that walk have oil squirters
__________________
2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods:
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#11
10-04-2006, 03:58 PM
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Re: Crankwalk cause
I would have to agree with pr_ricer...
(steps on soapbox, prepares to repeat others' rant) I believe it has a lot to do with the crankshaft, I believe it was not manufactured within spec, I also believe that with an upgraded clutch, the pressure exerted on the bearing would be greater than intended by the manufacturer... I believe that pressing in the clutch to start the car causes the two surfaces to mate without lubrication, which may be fine while sitting still, but when the car is started, that causes the two surfaces to come into direct contact, and causes accelerated wear on the two surfaces. Over time with repetitive actions, the two surfaces begin to wear until they are out of spec, by the time the clutch pedal drops; it is too late... Some people may even go through the clutch and transmission, which may temporarily patch the symptoms, but have not fixed the cause. When the crank position sensor is shredded, then the block gets looked at a little closer, but all the damage is done... You may be able to salvage it by dropping in a new crank and bearings, but I would simply suggest swapping... either swap or get a fresh block and build it with aftermarket bearings,etc... (steps down) On a side note, has anyone ever pulled out the mitsu blue prints and checked every inch of the motor... maybe the transmission sits in a way to put pressure on the flywheel/crank assembly?!? who knows...
__________________
Quote:
1991 Eagle Talon TSI - Broken Head removed, block broken, trans in hatch 1991 Eagle Talon TSI AWD- in pieces 3" exhaust, rebuilt bottom end Project: Assemble the Eagle is underway... and now with AWD 2003 Lancer Evo 1630hp/1593ft lb tq
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#12
10-04-2006, 04:12 PM
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Re: Crankwalk cause
So far so good with a polished crank and new bearings on the 7 bolt
__________________
2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods:
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#13
10-04-2006, 09:24 PM
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Re: Crankwalk cause
How many miles do you have on your new crank and bearing pr_ricer?
__________________
1998 Eclipse GSX 6 Bolt swap MHI Big 16g FP Race Manifold Apex'i N1 Cat-back Apex'i N1 Downpipe Walbro 255 fuel pump GReddy Type S BOV Turbo XS Boost Controller Balance Shaft Elimininator ACT 2600 RRE 11lb No Name Flywheel Prothane Motor Mounts Tokico Illuminas Advanced Handling Kit RRE Front and Rear strut tower bars RMDSM Front and Rear Sway Bars TRE Stage 2 Tranny ARP Head Studs, Main Studs, Rod bolts
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#14
10-04-2006, 10:02 PM
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Re: Crankwalk cause
Good deal!
__________________
Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#15
10-04-2006, 10:42 PM
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Re: Crankwalk cause
Quote:
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2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods:
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