GEN 3 oil pump seal replacement

[dz63]

Is it possible to replace the oil pump seal without disturbing the Oil Pump Case? I want to replace the oil pump seal and I am trying to determine if I should also buy the O-ring and the Gasket and replace at same time. Refer to the illustration below.

[gonesurfing]

I went ahead and changed everything while I was that deep in the engine, but removing the oil pump case requires removing the oil pan, which is a real pain and very messy.

To change just the oil pump shaft seal, I would remove the oil pump from the case by the half dozen or so 10mm bolts shown in the picture. That will not only allow you to change the oring (which is a very common leak point), but it will make pushing the old shaft seal out a breeze as the drive rotor is out. If the oring is dry rotted (mine was) gently remove the stubborn bits with a small screwdriver. Just be sure to put the driven rotor back in the oil pump case the same way it came out. It will have "worn-in" and assembling it in reverse could lead to additional wear and loss of oil pressure.

Oh, and while you're there, make sure the front main oil seal is good to go. It is a good time to replace it if it's questionable. Just don't knick the superfinish on the shaft.

[dz63]

Thanks gonesurfing. Don't particularly want to drop the oil pan. Good call on the drive rotor. I will replace in same position. Also on the O-ring as a common leak point. I will repalce that too.

My plan is to change out crank seal while I am in there. What is the best way to get this seal out without damaging the shaft? Got any advice? Special tool required? Also, do I need to drain the oil before changing either of these two seals?

[ghettosled]

maybe the link below might offer some help -

oil pump o-ring and pulley instructions

[gonesurfing]

My plan is to change out crank seal while I am in there. What is the best way to get this seal out without damaging the shaft?

I believe I used a razor to cut the outer lip, and then carefully pried with a duct tape wrapped screwdriver tip. Once I had something to grab, I used needle nose pliers for the final attack. It was slow and tedious trying not to scratch the seal surfaces. I think i used a pipe or large socket to push in the new seal. You'll want to get the new seal in exactly as deep as the old one, or else the groove worn in the shaft will allow oil to seep by the new seal.

Also, do I need to drain the oil before changing either of these two seals?

Unless you decide to remove the oil pan, I would leave the oil. After you get everything back together, I would run everything to check for leaks, and then change the oil.

One other note: Put some type of compatible grease or oil on the oil seals before pressing them in. They will be dry for a few seconds after initial startup, so pre-lubrication is important. Don't worry about lubing the o-ring.

[dz63]

gonesurfing - thanks for your comprehesive response. Much appreciated! Did you buy the o-ring from Toyota or aftermarket shop?

[gonesurfing]

Try NAPA. They had an oil pump gasket kit which came with just about everything.

[toyomoho]

Just take off the pump, the oil pump case does not need to be removed.

NAPA did not have the O-ring when last did this job, get it at the Toyota dealer and might just pick up the drive shaft seal at the same time but this is a standard part.

Remove the nut, pulley and drive rotor. Replace seal and reassembly. Make sure the dots on the drive rotor and driven rotor are lined up together. Use some grease on the O-ring to keep it in place when installed the pump.

[dz63]

Guys - thanks for your responses. TN forum is awesone!

toyomoho - Looking at the photos in the Haynes manual and reading the instructions, I think all that you need to do is install the dot on the driven rotor facing outward to ensure that it is not installed backwards in the oil pump body. Since the drive rotor has four lobes and the driven rotor has five lobes, within one turn the dots will not be lining up again.

I am planning on replacing both the drive shaft seal and O-ring.

[toyomoho]

That's right.