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Author Topic: Checking oil pump for wear  (Read 2832 times)

doitwright

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Checking oil pump for wear
« 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
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Frank Koronkiewicz
Willowbrook, Illinois

1970 280SL Originally Light Ivory - Now Anthracite Gray Metallic

mbzse

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Re: Checking oil pump for wear
« Reply #1 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.
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/Hans S

doitwright

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Re: Checking oil pump for wear
« Reply #2 on: August 10, 2020, 17:24:02 »
The question is: Is backlash normal for a new pump?
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Frank Koronkiewicz
Willowbrook, Illinois

1970 280SL Originally Light Ivory - Now Anthracite Gray Metallic

Benz Dr.

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Re: Checking oil pump for wear
« Reply #3 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.
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1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn
1966 230SL 5 speed
1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1990 560SEC

doitwright

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Re: Checking oil pump for wear
« Reply #4 on: August 14, 2020, 05:17:44 »
Thank you Hans and Dan for the information. It looks like the pump is a keeper.
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Frank Koronkiewicz
Willowbrook, Illinois

1970 280SL Originally Light Ivory - Now Anthracite Gray Metallic
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