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Author Topic: Checking oil pump for wear  (Read 1888 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

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 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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