Water pump pulley
Thread Starter
Member
Joined: Oct 2022
Posts: 111
Likes: 82
From: New Zealand
Water pump pulley
Bought a new water pump and noticed the pulley does not spin freely like an idler does, instead there is some resistance when turned by hand.
Is this normal for a new water pump, and to be expected?
Or was buying an el cheapo after market part my mistake here.
Is this normal for a new water pump, and to be expected?
Or was buying an el cheapo after market part my mistake here.
Thread Starter
Member
Joined: Oct 2022
Posts: 111
Likes: 82
From: New Zealand
MBWorld Fanatic!
Joined: Feb 2017
Posts: 2,315
Likes: 1,215
From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Bought a new water pump and noticed the pulley does not spin freely like an idler does, instead there is some resistance when turned by hand.
Is this normal for a new water pump, and to be expected?
Or was buying an el cheapo after market part my mistake here.
Is this normal for a new water pump, and to be expected?
Or was buying an el cheapo after market part my mistake here.
As long as there is no grinding or resistance you should be good.
New bearings should not allow a pulley to spin and spin because the grease inside offers resistance. A metal pulley with more weight will spin a little bit more. A pulley spins very freely with speed and noise once all of that grease is gone, and at that point it’s dead.
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Joined: Apr 2021
Posts: 846
Likes: 559
From: San Jose, CA
11 E550, 16 AMG GTS, 13 S550
Graf is THE correct choice. I haven't had a bad one in the 30 I've ordered. I've had bad REIN/Vaico though. Mahle/Saleri are also correct.
It's supposed to spin real tight, it's how it keeps pressure. The uh vanes have a tight tolerance and when the bearing lets go it wobbles which digs the vanes into the housing and frees up tolerance.
It's supposed to spin real tight, it's how it keeps pressure. The uh vanes have a tight tolerance and when the bearing lets go it wobbles which digs the vanes into the housing and frees up tolerance.
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Alpha European Autotech
Purchase Amsoil at 25% off from me
Chris Tran, Retired Alpha European Autotech Owner
Amsoil Independent Dealer #7236674
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