Type 4 oil pump rebuild, Comparison of OEM vs. Samba CNC pump |
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Type 4 oil pump rebuild, Comparison of OEM vs. Samba CNC pump |
Superhawk996 |
May 26 2019, 05:51 PM
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#1
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914 Guru Group: Members Posts: 6,663 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Playing with the idea of what it will take to rebuild a type 4 pump.
The pump that came out of my 2.0L engine is trashed from pumping rust. Both the gears and the housings are seriously scored. I figured I'd roll the dice and see what might be on Ebay. Took a gamble and bought a used pump hoping I might get some core parts that are useful. I did end up with a good housing outer. However, the gears are pitted and it the inner housing plate either has a serious casting flaw, or some sort of galvanic corrosion that pitted it. I always struggle with this kind of thing. It really would have minimal effect on the pump and it probably worked OK for a lot of years. However, I'd just like to know that it is perfect going before going into a engine. It looks like new inner plates are available but at a cost of $150+. I decided that since I have a donor "scrap" pump, I have nothing to lose by experimenting with machining it. |
Superhawk996 |
May 26 2019, 06:02 PM
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#2
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914 Guru Group: Members Posts: 6,663 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
I decided to start with my original pump inner housing since that was in better shape.
On the original it had some light scoring and the stationary shaft had been pushed out toward the cam and actually had been lightly brushing the cam bolts. No harm in messing with this one. Disassembled for machine work. Setup in the lathe for a light skim cut. The idea here was to just do a light skim cut of 0.001 - 0.002" to clean up the scoring. |
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