Rear main seal leaking after clutch replacement !?!

[oachkatzlschwoaf Lurker Find all posts View Profile Close oachkatzlschwoaf]

Hey guys,

need your help again. 3 weeks and about 1000kms ago i had the clutch done on my prado rv6 manual. Today i got the happy news, that the oil leak which i discovered accidently a week ago is caused buy a failing rear main seal.

Now im wondering if the mechanic maybe made a mistake, because he had to get the gearbox out but im not sure if he changed the main seal or what he did :/

The invoice says :

Work done : Remove transmission, clutch and flywheel, degrease inside bell housing and rear of engine, replace oil seal, refit flywheel and thighten as per factory specs, fit new exedy clutch assembly, relube clutch fork pivots, refit transmision. change front diff oil.

So he obviously cleaned the rear of the engine, where the rear main seal is located. You would think he also changed it while he was there...But then why its leaking ... I will call the mechanic this week, but first id like to hear your opinion on this, since mechanics can be a bit dodgy when it comes to waranty claims :/


Now my first question is :
What does the oil seal, in that context mean ? is it the rear main ?
Ive got a part number for the oil seal on the bill, its B-402593S for 35.95 $.
Searched the web, but couldnt find an answer; anyone knows what seal that is?

Second question :
Is there a manual or a guide how to drop the gearbox ect to get to the rear main seal of the prado ? I have the time and the tools, but im not very experienced, thus not too confident to do that big a job without any guidance.


Any help is greatly appreciated, thanks, guys !

Cheers, Korbi

[gspy4u Senior Member Find all posts View Profile Close gspy4u]

according to allied bearings that's the rear main seal part number

Rr Crankshaft 1996-03 402593S 5VZFE 92X110X8.5 Part: SKU158499 - $23.15

so they have replaced it looking at that invoice. If so, then they should have to fix the leak. May have pinched or scared it putting on. I's be chasing them up first to see what they say.

[CoreyTroy Member Find all posts View Profile Close CoreyTroy]

Sounds like a definite fix under warranty from the invoice.
Save yourself time and dollars and take it back for sure.

[scottkz Senior Member Find all posts View Profile Close scottkz]

Sometimes when a seal is replaced it actually leaks worse ! Sometimes the shaft gets a groove cut from an old stiff seal it comes with experience fitting new seals to look out for this

[Anth120playdo Banned Find all posts View Profile Close Anth120playdo]

Generally Toyota don't leak rear mains.
This is why I say, if it ain't broke don't fix it.
So sounds like same old story. Ahh well they will get another go at it.
Sorry.

[oceanracer Moderated member Find all posts View Profile Close oceanracer]

Generally Toyota don't leak rear mains.
This is why I say, if it ain't broke don't fix it.
So sounds like same old story. Ahh well they will get another go at it.
Sorry.

My theory is its that old and is end of life so it needs to be changed regardless

[MacroP Member Find all posts View Profile Close MacroP]

Of the dozen or so toyota engines I've rebuilt over the years (for project cars/4WDs) I've noticed on a couple of them that there was a groove formed on the crank from wear as scottkz mentions above. I've had to use a speedi sleeve a couple of times to fix it as the engines were getting on a bit.

One thing I've always been told many times from my mechanic friends/colleagues is to only use genuine Toyota rear main seals as these seem to be best and don't leak. I've learnt my lesson the hard way a couple of times.

I would have assumed a (good) mechanic would actively check for wear of the crank or correct installation of their new seal, especially on an older engine like yours, to ensure no rework down the track.

I guess your mechanic is going to be swearing a lot when they admit they'll have to rip out the box again. Good luck.

[oachkatzlschwoaf Lurker Find all posts View Profile Close oachkatzlschwoaf]

Thanks for your advice again, the mechanic fixed it on his own expense, only had to pay for a proper toyota seal. The seal he used was supposed to be the proper one for my car, but it was minimal different from the original and didnt fit perfectly on the crankshaft.

Of the dozen or so toyota engines I've rebuilt over the years (for project cars/4WDs) I've noticed on a couple of them that there was a groove formed on the crank from wear as scottkz mentions above. I've had to use a speedi sleeve a couple of times to fix it as the engines were getting on a bit.

One thing I've always been told many times from my mechanic friends/colleagues is to only use genuine Toyota rear main seals as these seem to be best and don't leak. I've learnt my lesson the hard way a couple of times.

I would have assumed a (good) mechanic would actively check for wear of the crank or correct installation of their new seal, especially on an older engine like yours, to ensure no rework down the track.

I guess your mechanic is going to be swearing a lot when they admit they'll have to rip out the box again. Good luck.