Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: doitwright on August 10, 2020, 11:19:00

Title: Checking oil pump for wear
Post by: doitwright on August 10, 2020, 11:19:00

I purchased what was described as a NOS oil pump. Now that I have received it. I am questioning if it is new or worn out. Should There be any back and forth play in the gears? I demonstrate what I am talking about in this video.

https://drive.google.com/file/d/1Uegm-MRs9gWTV7b-6MCdy5fAmg6LxXMN/view?usp=drivesdk

Title: Re: Checking oil pump for wear
Post by: mbzse on August 10, 2020, 16:41:28

Quote from: doitwright

.../...oil pump. Now that I have received it. I am questioning if it is new or worn out. Should There be any back and forth play in the gears?.../...

There are specifications in the workshop manual (BBB).
See attached. One can use blade or pin feeler gauges, micrometer etc in order to evaluate status of a used engine oil pump.

Title: Re: Checking oil pump for wear
Post by: doitwright on August 10, 2020, 17:24:02

The question is: Is backlash normal for a new pump?

Title: Re: Checking oil pump for wear
Post by: Benz Dr. on August 11, 2020, 04:25:17

Quote from: doitwright on August 10, 2020, 17:24:02

The question is: Is backlash normal for a new pump?

Yes, you would need a little bit to keep it from binding. Radial play or backlash is in the .002 - .003" range so it's not very much.

Title: Re: Checking oil pump for wear
Post by: doitwright on August 14, 2020, 05:17:44

Thank you Hans and Dan for the information. It looks like the pump is a keeper.