60 Series LandCruiser gearbox oil leak

Submitted: Sunday, Apr 13, 2003 at 10:48
ThreadID: 4374 Views:8745 Replies:3 FollowUps:0
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My HJ60 Series '85 LandCruiser has developed an oil leak in the gear box / Transfer case region. I have replaced the propeller shaft seals (front and rear ) plus the speedo cable seal but still it leaks. It appears to be coming from somewhere up top as the oil is running down all around the front rear and sides and dripping off the transfer case. The gear box and transfer case filler caps are already linked by an equalizer pipe. The breather on the top of the gearbox is free (and dry).
Has anyone got any novel ways of testing transmission oil leaks as oil only leaks after the vehicle travels more than 40Km. It stays dry after short trips.
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Reply By: Bob - Sunday, Apr 13, 2003 at 12:20

Sunday, Apr 13, 2003 at 12:20
Frank..., have had a problem like this before, and it turns out to be the gasket between halves of transfer case. Always leaks up the top, and runs down over the transmission. On later models, and think 60 is same, if you remove rear trannie mount, and lower tran on a jack, you can remove the rear of t/case, to replace the gasket. Of course, you need to remove the tail shaft too. From memory, you won't have to remove the rear output flange, after you take off the t'shaft.

Would suggest you also fit new O-rings on counter shaft. The only trouble you can have is with thrust washers on counter shaft, they have a small lug on one side that fits into slot on front and rear case. It's all a bit fiddly, but if you have access to hoist or ramp, it becomes much easier.

Get some gasket cement to stick the gasket to front half of t/case, there are two dowels there that help to centre the gasket. while you refit the rear half. A nylon or soft hammer helps to refit, once all gears etc are lined up, to put rear case into place.

Good luck, hooroo...
AnswerID: 17504

Reply By: Phil G - Tuesday, Apr 15, 2003 at 20:49

Tuesday, Apr 15, 2003 at 20:49
I had that problem on my old 60 series. Fixed it by putting some silastic into the bolt hole and putting the bolt back in. Not a textbook answer, and no guarantees but it was still leak free 100,000km later.
AnswerID: 17706

Reply By: Steve R - Saturday, Apr 19, 2003 at 13:54

Saturday, Apr 19, 2003 at 13:54
I have a '89 FJ62 and just fixed my gearbox with the same problem. The counter gear in the transfer box has an oil slinger fixed to the back of it that throws oil around the box. Trouble is, it lines up direcly with the join in the transfer case front and rear halves. After a while the gasket beaks down at the very top of the joint due to the minute amount of movement from the transfer case "twisting" under heavy torque loads.
I did not need to drop the gearbox mount - the transfer case separated quite easily, though getting it back was a little fiddly.
Keep a check on the bolts that hold the two halves of the transfer case together, I've heard that after a while they can loosen slightly, causing a leak.
Happy motoring :-)
AnswerID: 17925

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