CCIS Oil Pump Cleaning

   If your oil pump is working fine don't mess with it, but if your LJ hasn't been driven for a long  time (years) then it might be a good ideal to clean the pump, again in most cases it is not necessary. With that said, let's get on how to rebuild your LJ oil pump. First lets take a look at the over view of the oil pump.

The body (Part Number "F") has one Inlet line that comes from the oil tank reservoir and 4 lines that go to the engine, these are held onto the pump with special bolts that have a hole bored through the center about half way up the bolt then a side hole thus allowing the oil from the lines to go in or out of the pump, when you retighten them do NOT over tighten or they will break leaving half the bolt in the pump body. There are also two special washers on each line make sure not to lose any when unbolting the lines from the body. Remove the cable from the Throttle Cam and then remove the two bolts that hold the pump to the engine. There are small parts in the pump so a good clean work bench would be a good idea.

Make sure you look at every part as it comes out taking note of which way it was facing, if you should forget, the overview picture shows the correct positioning.

First thing to do is inscribe a mark across the End-Plate (A), this is the one that is right next to Throttle Cam, the plate has to go back on the same way it came off due to a keeper that holds in the Throttle Cam, remove the two screws holding the end plate on and remove it. Then remove the throttle cam by pulling outward away from the body. Next remove End Plate (B) being careful as it has a spring inside then remove the Inner parts (E), you might have to use a pair of needle-nose pliers to get the second part out. Next is to remove Drive Gear Seal Plate (C) by taking a piece of cloth and a pair of pliers and gently twist while pulling out the part, it is pressed into the body (F) then you can remove the Drive Gear (D) making sure to watch out for a small piece of round flat brass that the drive gear rides on, it is not in the picture because I forgot about it when I set it up for the pics, do not forget to put it back in when reassembling the oil pump, now the Inner Part (G) can be removed. Clean all the parts with cleaning solvent (you can use carburetor cleaner in a aerosol can) making sure every single part and holes are thoroughly cleaned. If you have air use it to blow out the cleaning solvents and any left over dirt.

Reassembling:

Use the same oil you are going to be using in your LJ and coat all the inner parts including all O-Rings, drive gear and throttle cam before reassembling. Start by sliding in Inner part (G) to where you can see the gear teeth through the Drive Gear hole, next drop the little brass washer where the drive gear will ride on it when it is seated, then slide in the Drive Gear till it touches the inner part (G) and then turn the drive gear clockwise to thread the two gear teeth's together where they match perfectly seating the gear drive on the brass washer, press on the Drive Gear Plate (C) by hand making sure to have some oil on the O ring for an easy press. Next slide in the Throttle Cam (B) making sure the return spring is in it's correct position then install the end plate (A) with the notches lined up. Install Inner Parts (E) and End-Plate (B).

Clean the reservoir tank and feed line (the oil line going to the Inlet of the oil pump) make sure every little contaminant is removed and not blocking the outlet hole in the bottom of the tank. Once the oil pump has been replaced tighten all the outlet bolts being very careful not to over-tighten them, all they need is to be snug, also be sure to have both of the washers on the top and bottom of the hoses. Lightly hand tighten the oil line coming from the reservoir tank then put a quart of the 2 stroke oil in the tank, letting the oil bleed out the fitting that is on oil pump, if none comes out loosen the bolt a little till it does, let some come out for a second or two then tighten the bolt. You should be ready to start the engine, keeping an eye on the outlet lines watching to see if the oil is pumping through them, the oil doesn't move fast but you will notice the movement. If you want to be safe you can mix your gas with oil for the first two or three gallons of gas (premix it at 30:1) by then the oil will be pumping the way it should through the pump.