06-14-2011
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#1
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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2.4 6 bolt crankwalk?
So I finally got to drop the trans, since I thought the flywheel bolts backed out again. Come to find out theres as tight as can be. Whats weird though, I can shake the flywheel and the crank moves. I know its possible that any crank can walk, but is this the case here? Or are my bearings just shot! I still have to drop the pan and will get to that tomorrow. Just wanted to get some opinions.
The car had a really bad vibration on acceleration and deceleration.
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06-14-2011
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#2
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aka Goodbye
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Re: 2.4 6 bolt crankwalk?
If you can wiggle the crank front to back, your thrust bearing is shot. Sounds like crankwalk to me. How did you set the crank?
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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06-14-2011
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#3
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
It's defenitly more side to side than in and out. I can't move it now that the flywheels off, but when it was on it moved a good 1/4in or so.
I didn't I bought the car with the motor in it. It was done prolly 6 years/30,000 miles ago when the motor was built. I'm not an engine builder so I guess I don't know what to do from here. Except obviously start gathering parts for the build.
If you guys don't know, I bought this car from Jim (talonfiero). Funny thing is I just told him last weekend that it was gonna be down for a year, to get all freshened up after maps event. To bad it's time came a few weeks to early!
Last edited by CornFed2.4; 06-14-2011 at 11:32 PM..
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06-14-2011
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#4
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Join Date: Sep 2007
Location: In my garage
Drives: 2G DSM
Posts: 600
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Re: 2.4 6 bolt crankwalk?
Side to side? Sounds like some impressive wear. Get pics up when you tear that sucker down. I wonder if whoever built it plastigauged it at all. Crank might be out of round. Mains may be out of round if it wasn't line honed with ARPs.
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06-15-2011
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#5
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
Pulling out tonight. I'll be updating the project thread for now.
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06-15-2011
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#6
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aka Goodbye
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Re: 2.4 6 bolt crankwalk?
Side to side? Even if the bearings were missing entirely it wouldn't move 1/4". Best to pull it apart and assess the damage. It made it 30k miles so it doesn't sound like anything to do with assembly, probably just living a hard life or possibly run low on oil recently. If you find the block is shot, shoot me a PM, I might have a cost-effective solution for you.
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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06-15-2011
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#7
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
Yeah, it was built good! 30k on a build isn't bad at all. When I say a 1/4 inch that's how much the flywheel moved while it was bolted to the crank. I can barely move it with the flywheel off.
I'll prolly be contacting you through pm either way. Lol
Last edited by CornFed2.4; 06-15-2011 at 03:45 PM..
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06-16-2011
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#8
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
Dropped the pan, nothing in the oil at all! Got pumped after looking everything over and all looked good. Then I shook the flywhell and found the culprit! There is a crack in the crank, on the flywheel side of the #4 connecting rod. So I dont think Ill need a total rebuild.
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06-16-2011
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#9
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flips McGee
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Re: 2.4 6 bolt crankwalk?
Unreal! Lucky it didn't grenade man! Carnage pics whenever you get it apart.
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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06-17-2011
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#10
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
there really was no carnage. Just gonna have a crank come out in two peices!
Sidebar-I heard ur car put down some nice power. Good for you man, keep it up!
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06-17-2011
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#11
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Reynolds number user
Join Date: Oct 2003
Location: grove/tempe
Posts: 3,553
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Re: 2.4 6 bolt crankwalk?
If 2.4 cranks break, its always near where yours broke.
Mine hasn't broken yet, 4 years later. KNOCK ON WOOD
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07 Ducati Monster S4R
00 honda elite 50 (64 mph braH!)
05 malaguti F15
04 E55 AMG
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06-19-2011
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#12
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: 2.4 6 bolt crankwalk?
2.4 cranks break? glad I hear this NOW, right after I get done swapping one in.
__________________
Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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06-19-2011
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#13
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
^^^ You could always swap it out and Ill buy it. LOL
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06-19-2011
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#14
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
Oh and this was not crankwalk!
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06-19-2011
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#15
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Join Date: Feb 2007
Location: Coon Rapids
Drives: 96 talon, 2.4L & 3582r
Posts: 130
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Re: 2.4 6 bolt crankwalk?
Any one what kinda power are breaking them at? Or is it just chance?
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06-20-2011
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#16
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Join Date: Oct 2005
Location: The land of the next-gen HMMWV
Drives: A BMW
Posts: 1,875
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Re: 2.4 6 bolt crankwalk?
Quote:
Originally Posted by CornFed2.4
^^^ You could always swap it out and Ill buy it. LOL
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for you, $3k. you can have the rest of the car with it, haha
__________________
Style's automotive engineer
Sponsored by DB Performance (dbptuning.com)
A dsm, a bimmer, a DORGE CUMMINZ, and a non running DSM race car... for now.
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06-20-2011
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#17
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Join Date: May 2005
Location: Linwood, MN
Drives: You crazy!
Posts: 2,354
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Re: 2.4 6 bolt crankwalk?
I found a crank, Im good!
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