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Old 01-02-2012, 03:13 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
603 oil pump servicing

I can't find in the W124 FSM information on testing the 603 oil pump, only removal and replacement as a unit. How can I check that a pump is good for reuse? How do I take apart the pump to check the impellers? Is there a section I'm missing?

Thanks,
Sixto
87 300D

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Old 01-02-2012, 03:26 PM
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Join Date: Jun 2007
Location: Waterloo Illinois
Posts: 1,336
Quote:
Originally Posted by sixto View Post
I can't find in the W124 FSM information on testing the 603 oil pump, only removal and replacement as a unit. How can I check that a pump is good for reuse? How do I take apart the pump to check the impellers? Is there a section I'm missing?

Thanks,
Sixto
87 300D
I have a extra oil pump for my 84 190D that was stuck, the motor was stored outside with a hole in the oil pan. I took it apart and it was full of water and junk, I cleaned it and lubed it up and it moves good now. Taking apart is simple, just remove bolts, and I dont remember but there is a spring that I removed and cleaned and lubed. These things are built very well. Goodluck.
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Old 01-02-2012, 06:56 PM
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Join Date: Jun 2011
Location: Las Vegas, NV
Posts: 348
Just take the pump apart and clean all the parts.
Look for any damage or wear.
Most important is the inside of the main housing, the part where the gears run in.



I know it is a 617 pump, but the concept is the same.

The inside walls should not be scratched to badly.
If they look useable, just smooth them out with some fine emery cloth.

Smooth out all surfaces on the gears.



Install the gears in the housing and measure the clearance.
On the 617 it should be 0.05 to 0.06 mm top and side.
I assume the 603 is similar.





Next you have to surface the lid.
It may look somewhat like this.



Move the lid over some emery cloth on an even surface.



You may want to start with a coarser grid and then move to a finer one.

Almost done (coarse grid in use).



Done (after fine grid used).



And a final check.



A note on assembly.
I always turn the driven gear around, so that the 'unused' surface of the driven gear runs against the drive gear.
The verdict on this may be split, but i had never problems with this practice.

The housing and lid have no dowel pins, so you have to align them manually.
To do this, assemble the pump and tighten the screws lightly.
Try to turn the pump shaft.
Now use a small hammer and hit the side of the lid lightly.
Turn the shaft again.
Repeat until you find the position where the shaft/gears turns most easy.

Just for the record.
This 3 gears are out of a 616 (left), 617NA (middle), 617Turbo (right).
Just the height is different, the diameters are all the same.




__________________

76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.
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