Author Topic: 86-90 oil pump  (Read 235 times)

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Offline xlfan

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86-90 oil pump
« on: May 10, 2018, 03:11:34 AM »
Are these oil pumps still available?

Offline aswracing

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Re: 86-90 oil pump
« Reply #1 on: May 10, 2018, 05:22:38 AM »
No, but you don't want one anyway. It's pretty easy to put a 5-speed pump onto a 4-speed and the pumps have been much improved over the years.

Offline xlfan

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Re: 86-90 oil pump
« Reply #2 on: May 13, 2018, 04:43:39 PM »
Most definitely intreagued  :smiled:

Offline xlfan

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Re: 86-90 oil pump
« Reply #3 on: May 18, 2018, 12:45:32 PM »
No, but you don't want one anyway. It's pretty easy to put a 5-speed pump onto a 4-speed and the pumps have been much improved over the years.

How easy  :smilep:

Offline aswracing

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Re: 86-90 oil pump
« Reply #4 on: May 19, 2018, 07:46:32 AM »
How easy  :smilep:


Well, the short answer is shown in these two pictures, credit to Dave76 on the XL Forum for these:



Drill this hole and tap it 1/8-27 NPT. The drill size should be written on the tap, but the charts may tell you a "Q" or "R" or 11/32, depending on which one you read. I would use the size that's written on the tap.

You *should* be able to do this with the motor still in the chassis, if you can get enough access. I highly advise removing the cam box cover, because you'll want to blow any chips you make out of that passage. That passage just goes out a hole in the cam box cover mating surface (the one directly above it, in between the two pieces of blue tape), it doesn't go anywhere else.




Now just use a 1/8 NPT elbow and a flare fitting like this. Some guys even use a hose barb fitting and a hose clamp, but generally speaking a flare fitting is safer when it comes to pressure side oil.

You can see the hole in the cam box cover mating surface much better in this picture, directly above the fitting. That's the only place this passage connects too. Oil coming from the filter pad comes into this fitting, into the cam box cover, from there it goes up and feeds oil into the pinion shaft and into the lifter galleys. So as long as you've removed the cam box cover, it's really easy to blow out any chips you left behind with the tap.

The hose that connects to this new fitting is the return from the filter pad. On a 4-speed pump, that hose connects to the pump, which then just passes the filtered oil up into the engine. But the 5-speed pump doesn't have that fitting, so you have to add it to the case directly.

Once you have this fitting in place, the 5-speed pump can be bolted on and it works fine. You have to put the fitting in place first, though, because once the pump is bolted up, you can't turn the fitting to screw it in.

The part number for the pump is 26204-91A. The latest and greatest version came out in 2007, but they didn't change the part number. Internally it's much different though, with a bigger scavenge section and a smaller pressure section. It comes with the screws and gasket and the other fittings.


Offline xlfan

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Re: 86-90 oil pump
« Reply #5 on: June 05, 2018, 03:18:55 PM »
Great! Thanks alot  :up: