Tail Shaft rear seal problems

[lovespaj]

I replaced the main seal out the back of the transfer case going to the rear tail shaft . prop shaft as some may know it.

This is the third seal in as many months. The old seal was like new when I removed it, but oil leakage was abundant. The new seal seems the same. I replaced it and went for a 10klm trip, oil everywhere.

Seal went in ok with a gentle tap from mallet,its level in the right way, grease around lip, made sure shaft went straight in and never put sideways pressure on seal.

Shaft itself looked really good nick and I had it under a magnifying glass , nothing seen.

Seals came from Mitsubishi, they have a vin no system so it should be the right one.... There is a 1mm difference in seal ( smaller) ; and shaft diameter.

the shaft had new joints and was balanced 5 months ago , still feels tight with no noticeable movement.

Any ideas on how to stop the oil leaking out????
Cheers
Mike

[dbomba]

I replaced the main seal out the back of the transfer case going to the rear tail shaft . prop shaft as some may know it.

This is the third seal in as many months. The old seal was like new when I removed it, but oil leakage was abundant. The new seal seems the same. I replaced it and went for a 10klm trip, oil everywhere.

Seal went in ok with a gentle tap from mallet,its level in the right way, grease around lip, made sure shaft went straight in and never put sideways pressure on seal.

Shaft itself looked really good nick and I had it under a magnifying glass , nothing seen.

Seals came from Mitsubishi, they have a vin no system so it should be the right one.... There is a 1mm difference in seal ( smaller) ; and shaft diameter.

the shaft had new joints and was balanced 5 months ago , still feels tight with no noticeable movement.

Any ideas on how to stop the oil leaking out????
Cheers
Mike

Interesting. I cant suggest anything but is the oil leaking between the seal and the housing or the seal and the tail shaft.
Daryl

[Yonnee]

Believe it or not, the rubber in the seal can wear a groove in the yoke of the tailshaft. This groove can be enough to make it leak quite badly, even with a new seal, and can chew out a new seal fairly quickly too.
To check this out, pull the shaft out and run your thumbnail along the part of the yoke where the seal runs. If you can feel a groove or a ridge, this might be the problem.

[lovespaj]

Thanks, I did not find a groove, and the shaft is smooth all the way along.

To check this out, pull the shaft out and run your thumbnail along the part of the yoke where the seal runs. If you can feel a groove or a ridge, this might be the problem.[/QUOTE]

[m1s3ry]

Seeing that you've replaced the seals several times, it's probably the welch plug that's in the yoke of the tail shaft. It's hard to see and you'll need to separate the uni-joint to get at it.

I've had mine front one replaced when changing seals didn't stop the oil leak that i had.

[Errol]

Had the same on the front one. It was the welch plug.

[-PAJ-]

does the slip joint have any movement? if so it could be the joint in the back of the transfer, if the slip joint moves it will leave a space for the oil to get out.

[lovespaj]

does the slip joint have any movement? if so it could be the joint in the back of the transfer, if the slip joint moves it will leave a space for the oil to get out.

Will check it out. do you mean if I can move the shaft in the joint????
Will check for all lateral movement.

Do you know if the output shaft has a bush or a bearing? And is it easy to get to? Mechanics or Me????


I read on the net that the end of the prop shaft may have a plug in it that can come loose and can leak oil, that appears like its coming from the seal.
Will take prop shaft out tomorrow and pour oil down the end to check.

Will check it out in the AM as its dark and very cold outside tonight , freezing Melb! I hope I can so some snow driving this weekend though!!!!


Cheers
Mike

[Chenko]

Seeing that you've replaced the seals several times, it's probably the welch plug that's in the yoke of the tail shaft. It's hard to see and you'll need to separate the uni-joint to get at it.

I've had mine front one replaced when changing seals didn't stop the oil leak that i had.

A good diagnosis. The tail shaft welch plug is quite overlooked as determining a oil leak.
Danny

[03gallagherj]

Seeing that you've replaced the seals several times, it's probably the welch plug that's in the yoke of the tail shaft. It's hard to see and you'll need to separate the uni-joint to get at it.

I've had mine front one replaced when changing seals didn't stop the oil leak that i had.

Same problem as mine i do believe, mine hasnt gotten bad yet just looses a little bit of oil not enough to worry about over 10,000km's

But i plan on replacing it pretty soon
Jackson

[-PAJ-]

Will check it out. do you mean if I can move the shaft in the joint????
Will check for all lateral movement.

Do you know if the output shaft has a bush or a bearing? And is it easy to get to? Mechanics or Me????
Cheers
Mike

If you grab the uni closest to the slip joint and push the uni up down and all around you'll be able to see and feel if the slip joint is moving. If it is moving the bush in the transfer is farked, I haven't changed one so I don't know how hard they are to change.