Something the manual says to do next, I had no idea why, nor do I have any concept now, but I will share with you what the manual says, and what I did.
It instructs you to open the pressure relief valve and take out the plunger and piston. “Take out” could mean dinner and a movie…we WERE trying to get that screwdriver in the hole. The problem I had at this point in the operation is that I couldn’t locate my 22MM wrench, and even if I had it, there wasn’t space enough to get the box end over the bolt.
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I ended up taking the unit apart after removing it. I cleaned it out real good, and put some assembly oil in things, then reassembled it. The manual’s instructions for re-installation seemed rather casual, so I don’t think this is a crucial step, but it is good to get this component clean, since you’re not replacing it.
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You see the oil filter unit to the left: it is the first to come off, and the last to go on. It is part of the overall bolt pressure against the oil pump plate, so it will be torqued in sequence as the new pump goes on.
But let’s get the old pump off, first.
If you loosened the bolts and placed them on the cardboard holder, then you’re ready to remove the oil filter unit, then the oil pump plate. Tapping with the block will help loosen it, a nudge here and there will get it to come off, but keep in mind there are two oil seals and a balance shaft fighting you a little bit. Keep an eye on the balance shaft end, and make sure it doesn’t come out attached to the oil pump, itself.
At this point, conduct a real good clean up, get the old gasket material off the front of the block, and clean it real good with acetone. If you haven’t done so yet, get under there and clean off the oil pan surface of the block. You’re now at the halfway mark of your journey.
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Almost everything you removed can only be put back one way, so you need not panic about which side of this or that goes where. Take note of the two crankshaft gears, and note the "photographic" impression the gears have left on each other. Note also the flanges between them, as it's important to put these back correctly. The 'photographic' impressions are a big help in re-installing them right. Observe that the timing marks are clear on each part.
It is VERY important to have these parts as clean as possible, as they conduct the timing of the whole engine by way of a rubber belt...a belt that does not want oil or grease on it.
You'll find that if you open the old oil pump, even those gears are marked with timing marks. Note that the balance shaft end can only be put in one way: this all helps eliminate guesswork and mal-placing the pieces. It is the oil pump that turns the balance shaft.
An important note I pass along is that the new oil pump didn't seem to turn clockwise: it bound up, but WOULD turn counter-clockwise. This caused me to panic, but later I found that when the balance shaft is in place, proper orientation takes place. Remember to never turn the engine counterclockwise more than a scoash, a kunt.hair or a tad. This is more important once timing belts are on, but I took caution in not forcing the new pump to turn clockwise.
It all comes out in the wash.
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