Oil Pump

[irowiki]

Are used oil pumps dependable, or should I just buy new? If used is fine, looking for a good used oil pump that'll work with the second gen timing belt cover.

[marlinh]

Used pumps are usually fine. It is just because of the catastrophic failure of that engine makes me suspicious.

[xirdneh]

Recently I took a used oil pump apart and inspected the thing as per the FSM
it was within tolerance and i did not see any gouges in the aluminum where the pump spins
I cleaned it up and put it back together
before starting the engine i hooked up an oil pressure gage just to make sure everything was OK
i have driven several hundred miles and so far so good
it was fairly easy to work on
getting the phillips type screws out took an impact driver (i used a hand held smack with hammer type)
I tightend them up with same tool and used loctite on threads

[dlb]

rob do you have a pic of the kind of impact driver you used? i think i know what you're talking about but am not 100% sure.

[marlinh]

http://en.wikipedia.org/wiki/Impact_driver

The manual one at the top of the page David. They are an awesome tool when you need it.

[ARCHINSTL]

http://en.wikipedia.org/wiki/Impact_driver
The manual one at the top of the page David. They are an awesome tool when you need it.

What Marlene typed!
I have one of these, from Harbor Freight - not used often, but when needed - wow! http://www.harborfreight.com/impact-scr ... 37530.html
Frankly, I would have preferred the one from Home Depot, but it does not come in a handy storage box, so...

OT, but Thanks for the Wiki link's Reference footnote - I'd never heard of Robertson screws before - apparently they are a Canadian thing.
http://www.dww.com/?p=3835
Tom M.

[dlb]

this is going way off topic but i like it.

first, i've seen those impact drivers before but not sure where. i have run into a few occasions i could have really used one so i will pick one up.

second, tom, i can't believe you've never heard of robertson screws before! they are more or less the norm up here at most hardware stores. i like them more than blade screws because the bit doesn't slide out, and more than phillips screws because the screws take much more torque without stripping.

torx are pretty good too but i hate allen bolts/screws. probably just from my association with VWs.

[ARCHINSTL]

David - I'd agree with you on Robertson screws/bolts being better than slotted and Phillips, even though I'd never heard of them before; they make sense.
In all of my many years, this was a new one on me - Home Depot, Lowes, et al, do not carry them. Obviously their equivalents in Canada do - maybe their USA branches nearer the border do?
While I've never been a woodworker, I've still never heard of them for that usage in this country - but if they were good enough for the immortal Mosquito, then...
I like Allen bolts/screws - mostly from my long ownership of a bicycle store, where they are the norm.
Tom M.

[irowiki]

I'll have to look at sears next time I go for one of those, I have reward points waiting!

[Petros]

so that was the Canadian who developed the square drive...Robertson. I curse him and all other evil Canadians that have foisted this evil contrivance on the world's populations. They suck big time, the regular Phillips is far superior because it has twice the number of bearing surfaces/edges, and the drive face is square, not taperted like the Roberson tip. the best is the star or "Torques" tips, lots of faces and corners to grip that screw. I have had to drill out more Robertson square drive than any other type of screw head because, unlike a flat with only two surfaces, the taper in the square drive will force the tip up out of the screw head, and very quickly it becomes bunged up and impossible to remove. It is a very bad idea, obsolete, and very frustrating to remove. So I curse Roberson, and everyone else that continue to make and sell this devilish screw heads. many of the big box stores here only sell deck or sheet rock screws with the Robertson drive tips that they get from Canada, If I see those I go shop for scews somewhere else. I always assumed it was a Canadian invention, and it looks like I wasm correct. ...Okay, rant over.


the impact driver looks like this, they are inexpensive since most are made in the orient. since they are only occasionally used the quality is not that critical, except for the tips, but you can buy quality tips from any hardware store. I would never be without one, as Tom says, when you need one there is no substitute. the tip spins about a 1/4 turn the same time you whack the end with a hammer so it gets driven into the scew head with a sharp impact and unscrews it at the same time. Simple and very effective.


how to use, enough room to swing a hammer can be an issue in some locations.

[xirdneh]

that's the one

[Petros]

heating the oil pump housing should also help get the screws out. sometimes I can get more than half of the screws out with a large phillips screw driver, and than have to go to more extreme measures the last few screws on the back of the oil pump.

BTW, you can clean up the face of the back plate if it has wear marks with a flat surface plate and 400 grit wetndry paper. If the gears are worn or the housing you can also sand on the flat surface the housing mating face, this reduces the height of the gear cavity. You can also flat sand the sides of the gears if they are scratched up. all of these methods can be used to reduce the clearnaces between the parts of the oil pump if out of tolerance. Of course if badly worn and chewed up it is best to replace it. But they are costly and you always risk getting the wrong one, so I would rather refurbish it if possible. Remove and clean out the bore and all teh parts of the by pass/pressure relief valve. I have also stretch the spring a bit to raise the oil pressure. Remember to get all the parts back in before you install it!!!

[irowiki]

Thanks guys, I'll go ahead and get this used one for $15 free shipping off ebay. Instead of $60 for a new one with shipping.

[marlinh]

That sounds like a good deal Paul.

[Petros]

cheaper than picknpull, and you do not have to and remove it yourself.

Good deal. Used oil pumps are a good bet, my last one had perhaps 340k miles on it, and was still showing good pressure when the piston rings gave up.