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Old 02-14-2018, 04:28 PM   #1
esimili
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Default new clutch slipping and grabbing

got. new clutch for my wrx flywheel resurfaced. it's slipping and grabbing sometimes now what could cause this?
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Old 02-18-2018, 09:49 AM   #2
Pistonjunkie
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Did the flywheel and pressure plate get cleaned before assembly? Could be an oil contamination issue if they werenít cleaned.
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Old 02-18-2018, 10:52 AM   #3
esimili
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Quote:
Originally Posted by Pistonjunkie View Post
Did the flywheel and pressure plate get cleaned before assembly? Could be an oil contamination issue if they werenít cleaned.
that's what I was thinking. would a warped flywheel do it too? also when I picked it up, I asked if I should go easy on it to break it in. he said no. is that right?
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Old 02-18-2018, 02:52 PM   #4
Pistonjunkie
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No, most manufacturers will tell you to take it easy for the first few hundred miles on most clutches.

A warped one maybe. How it was treated before it was resurfaced has a bigger impact. If it was thrashed pretty hard it could have some hard spots in it that wonít machine out with a re-surface job. I opted to replace mine when I did my clutch since Iím the 5th owner of my car and there is no telling how it was treated for the 13 years prior.
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Old 02-18-2018, 03:13 PM   #5
Vancouver98STi
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Quote:
Originally Posted by Pistonjunkie View Post

If it was thrashed pretty hard it could have some hard spots in it that wonít machine out with a re-surface job.
Is that even possible? And if so, wouldn't it be readily apparent when looking at the freshly machined flywheel?
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Old 02-18-2018, 07:37 PM   #6
Pistonjunkie
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Originally Posted by Vancouver98STi View Post
Is that even possible? And if so, wouldn't it be readily apparent when looking at the freshly machined flywheel?


It is and it would be. But it doesnít stop people from putting it together like that. Usually the same type of people that donít replace pilot bearings or clean the oil off of pressure plates or flywheels before assembly. And then tell you there isnít a break in on a new clutch.
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Old 02-19-2018, 10:58 AM   #7
Samurai Jack
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One has to question why the OP needs a new clutch after only one year.

As was said, new clutches have a break-in period of approximately 500 miles.
Abusing a clutch = early clutch failure.
Contaminates on pressure plate / clutch disk / flywheel = bad things happen

A warped flywheel? Highly doubt it
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