I'm busy putting my 88 back together. After reassembling the timing chest gears, the crank wouldn't rotate. First step was to remove the oil pump worm, and the crank was immediately free. The oil pump had jammed.
Several years ago I lapped the pump to remove all end float, and when I checked it a few days ago, there was light friction. Yet when I removed it a few minutes ago, it was jammed. Experimentally remove the four pump bolts, it's free. Tighten them again, the pump rotates normally with slight friction.
So what happened? If I refit as is, will it jam again? What to do to solve this glitch?
Strip to check for swarf o…
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I suspect Robert might hav…
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I have had another look at…
I have had another look at the pump. It was free of grit or other contaminants. I decided that I had probably made it a bit too tight, so lightly lapped the pressure gears for a looser fit.
BTW, on my pump there was no sign of any 'chamfer' to be put on the outer face away from the body. I checked that the wear witnesses on the gears met each other.
On re-fitting the pump to the timing chest, the problem revealed itself - the oil pump worm was contacting the half-time pinion. It turned out that the woodruff key was displaced, moving the half-time pinion outwards and causing the clash of gears. Now remedied.
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Strip to check for swarf or grit. Check its assembled correctly ,I think a gear can be assembled back to front.I would lightly blue the parts and look for the tight area, free it off . Or buy another pump.