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Oil Pump Cleanliness

Posted: Wed May 23, 2007 6:42 pm
by Jimny
Of all the engines I have rebuilt NONE was just wore out, I have always found that one or more of the oil lines had no oil in them and when I took apart the oil pumps they were dirty inside.

Dirt/dust is the main problem, the dirt gets into the pump and clogs up the last line hole which happens to be the number two piston oil line, since it is at the end of the pump (on the outside it looks even with the number one piston line but inside they are 1/16" apart) where the muck builds up and then eventually stops letting oil out.

I'm rebuilding LJ20Colorado's 20 engine right now and it had a tiny piece of gravel (or who knows what it is) and it locked up the oil pump, and due to that it tore up the splines in it.

You would think the fine mesh screen at the filler neck of the oil reservoir would keep things like that out but they sometimes do get in there.

SO: Take your oil pump off and open it up and clean it real good, I will redo the HowTo on the oil pump cleaning so it will be more detailed.

Then clean your oil reservoir completely, make sure the line from it to the pump is clean and the vent line as well. I have mention this before in this section, but it's something that needs to be pressed to keep the life of your LJ engine lasting longer.

Posted: Wed May 23, 2007 8:01 pm
by tweeder
might it help to put an inline filter/strainer on the pump feed line?

Posted: Thu May 24, 2007 4:52 am
by Jimny
That might slow down the feed of the oil to the pump. A strainer might not.

But the main thing is, just to clean it now and keep it clean!

Posted: Fri May 25, 2007 11:35 pm
by DieselBoy
So is there a write up on cleaning the oil pump anywhere??

I have driven my LJ50 round for a couple of hours now, and it doesn't seem to be pumping oil up the line to the cyclinder bores. I have double checked that the non return valve in that line is working, and it is, so wondering if the pump needs a clean??

Would love to stop running premix as soon as i can :))):

Posted: Sat May 26, 2007 3:44 am
by Jimny
You can find it here, it is kind of vague but it is pretty basic stuff, once you open your end caps and you see some buildup of dirty oil then you know for sure that's the problem, or it could be froze up.

You will want a can of carb cleaner with a spray straw on it to get into the "inner part E" to clean it out real good.

When you undo the line coming from thew oil reservoir the oil should drip out of the line easily, if not you have some type of blockage in the reservoir and or the reservoir line.

After you take off the pump turn the drive gear to make sure it is turning freely.

Posted: Sat May 26, 2007 2:59 pm
by DieselBoy
Cheers for that, its a pretty good article!!!!

Think i will strip the pump down on my spare engine and overhaul that, then swap them over 8)

Posted: Sun May 27, 2007 5:29 am
by Jimny
GOOD! I didn't know if it was detailed enough or not.

Let us know how the cleaning goes.

Posted: Sun May 27, 2007 3:29 pm
by DieselBoy
My only sugestion would be to put the steps in bullet point format to make it easier to follow when its sitting on the bench next to where your workin :cool:

Posted: Mon May 28, 2007 5:07 am
by Jimny
Very good idea!!! I will work on that... soon.