Based on what I've heard from @OGBeno, no one will ever pry parts dimensions out of Mr. T. So has anyone here RELIABLY measured the ID of the factory oil pump bushing? Or--does anyone have access to a new block, and the tools to accurately measure the ID when new? Be nice to know if mine actually needs replacing...
Anyone have a new block on-hand, or oil pump bushing spec?
- Thread starter jaymar
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- #4
Actually, I didn't.
Why don't you just measure the inner and outer diameters.
It should be less than .004
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- #7
Well, I'd have to buy a brand-new block to get one, and the bushing is already installed. So, that's a bit of a challenge.
Meant to say measure the inner diameter of the bushing installed in the block in a few different spots without getting into the grooves, measure the outer diameter of the idler gear. This should tell you if it's worn. This pushing is kind of like a cam bearing in a small block Chevy except for the grooves. Typically cam bearings tolerance range is .002 to .004 inches.Well, I'd have to buy a brand-new block to get one, and the bushing is already installed. So, that's a bit of a challenge.
I'm not sure if you know of this option, I've not used this or bought anything from them.
Was gonna say landtank has new bushes in stock normallyI'm not sure if you know of this option, I've not used this or bought anything from them.
That’s what I did when I rebuilt my bottom end. At that point you’re so deep in, what’s a couple hundred more $…..
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- #12
Yeah, thanks. I've found three suppliers, the only one I've seen feedback on--all positive--is @landtank 's. None of their photos show the full grooves. Thing is, I don't know the composition of the original. Machinist says it's a babbit, which, if true and according to my understanding (which is admittedly limited), is going to be different from the aftermarket offerings. Does that make a practical difference? Damned if I know. What I do know is, people go hundreds of thousands of miles on the original (I'm at 250k now on one engine, 170k on the one I'm rebuilding). I'm not sure anyone's driven anything near that on the aftermarkets, so long-term durability is unknown.I'm not sure if you know of this option, I've not used this or bought anything from them.
Upshot being, I'm now thinking that if the thing is still well within spec, I might just leave it in (which means using a friendlier cleaner in the tank). But to do that, I gotta know what the spec and the tolerance is. Your .002-.004 estimate may be dead-on for the tolerance, but I'd like to get the actual numbers for this application--if that's possible. Only way I can think of to get the spec is to measure a new one. Unless someone has access to Toyota's Book of Secrets...