Nope, no timing necessary: Because it's just the lift pump, it doesn't care about time, nor does it affect the injection pump timing. Unhook the lines from the lift pump. Undo the two bolts holding the lift pump on (centre top & bottom of the lift pump) and the lift pump should slide out from the injection pump. The drive gear will be held on the lift pump shaft with a snap ring. Take the snap ring and drive gear off to expose the seal beneath, pry out the seal (carefully - you don't want to score the shaft or housing. Best to stab directly into the old seal to get a hole to pry from). Lube the new seal up a little with some light oil or thin grease. Press the new seal in evenly (make sure it's the right way around, and that the lip doesn't catch and flip over as it slides over the shaft). Put the gear and snap ring back on. Re-install pump (may have to jiggle/turn it a little as you slide it onto get the gear teeth to mesh).
I can't remember if there's a gasket between the lift pump housing and injection pump. I don't remember one, but if there is you may have to make a new one out of some gasket material (try to get the gasket material about the same thickness as the old gasket - probably pretty thin). But as I say, I don't think there's a gasket in there.
SKF seal #4231 (or equivalent): 7/16" inside diameter, 0.836" outside diameter, 3/16" overall thickness.
Edited by DanielW - 19 Jan 2024 at 12:11pm
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