useful walkthrough.
http://www.extremeprelude.com/oilpump.html
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How To - Oil Pump changing guide
- wurlycorner
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Nice clean engine (jealous) but...

What's the difference between USDM and JDM and why is the USDM supposed to be better?
The only differences I can see are in the sprocket that sits on the end of the oil pump shaft, where one has 4 slots and the other has 12 spokes. Can't see what's meant to be better there?
Can someone translate:

What's the difference between USDM and JDM and why is the USDM supposed to be better?
The only differences I can see are in the sprocket that sits on the end of the oil pump shaft, where one has 4 slots and the other has 12 spokes. Can't see what's meant to be better there?

Can someone translate:

--
Iain.
Iain.
Super Secret 1G (not really super secret!)