Anglo-Frenchman Posted July 17, 2007 Share Posted July 17, 2007 In my unceasing attempt to conserve the earths dwindling oil reserves, I thought I would once again try to trace the annoying drip from under the tranfer box. The front output seal has been replaced three times and is perfectly dry. The source seems to be the filler/level plug on the side of the gearbox and although it has been tightened as much as I dare, it is stil wet around it after a journey of reasonable length. The oil, which is clean, is running down the side of the gearbox and with the flow of air it ends up dripping off the bottom of the transfer case. Is there a gearbox breather that could be blocked? I have checked the transfer box breather and this seems OK and I am at a loss as to why this should be happening. Ged Quote Link to comment Share on other sites More sharing options...
Pete Attryde Posted July 17, 2007 Share Posted July 17, 2007 Yes there is a gearbox breather but I can't tell you where it is on yours. Pete. Quote Link to comment Share on other sites More sharing options...
simonb Posted July 17, 2007 Share Posted July 17, 2007 In my unceasing attempt to conserve the earths dwindling oil reserves, I thought I would once again try to trace the annoying drip from under the tranfer box. The front output seal has been replaced three times and is perfectly dry. The source seems to be the filler/level plug on the side of the gearbox and although it has been tightened as much as I dare, it is stil wet around it after a journey of reasonable length. The oil, which is clean, is running down the side of the gearbox and with the flow of air it ends up dripping off the bottom of the transfer case.Is there a gearbox breather that could be blocked? I have checked the transfer box breather and this seems OK and I am at a loss as to why this should be happening. Ged The breather is attached near the high low selector on top, it may exit in the engine bay depending on model. Crawl underneath with a torch and you will find it. I suggest disconnecting from the transfer and blowing through with an air line. The fill hole should be a tapered thread to seal it - try ptfe tape round the plug. Transfers can leak from the input seal where the gearbox mainshaft enters, it will run down the "front" face and drip of the bottom square cover. leaks from the intermediate shaft o rings cause drips in the same place. Both can be cured by moving the transfer box on long studs to gain access - see tech archive. Is the rear/handbrake end seal ok? Quote Link to comment Share on other sites More sharing options...
Anglo-Frenchman Posted July 17, 2007 Author Share Posted July 17, 2007 Thanks. Yes the brake is oil free. I have had the t/box out already about 6 months ago on the long studs as described and resealed it just in case. The oil is very clean which leads me to suspect its the main gearbox - my t/box oil is always black. I thought that the breather you describe was for the t/box not the g/box/? Quote Link to comment Share on other sites More sharing options...
western Posted July 17, 2007 Share Posted July 17, 2007 main gearbox has a breather too, the top end should be at the back of the cylinder head/bulkhead area ( should be 3, main gb,transfergb, front axle) Quote Link to comment Share on other sites More sharing options...
DiscoStu Posted July 17, 2007 Share Posted July 17, 2007 On the r380 box the G & T box breathers are at the top of the box (If you're underneath) about 6 inches apart. Tough to see without going from inside the vehicle. Stu. Quote Link to comment Share on other sites More sharing options...
simonb Posted July 17, 2007 Share Posted July 17, 2007 Thanks. Yes the brake is oil free. I have had the t/box out already about 6 months ago on the long studs as described and resealed it just in case. The oil is very clean which leads me to suspect its the main gearbox - my t/box oil is always black. I thought that the breather you describe was for the t/box not the g/box/? If oil is golden/brown its transfer, main box oil should be red. Transfer oil does tend to get dirty where as main box oil should always come out clean. Also transfer oil smells different to main box oil. Sulphur smell vs sort of fishy smell.... Quote Link to comment Share on other sites More sharing options...
Les Henson Posted July 17, 2007 Share Posted July 17, 2007 LT77 gearbox breather connection:- Les. Quote Link to comment Share on other sites More sharing options...
simonb Posted July 17, 2007 Share Posted July 17, 2007 R380 very similar, IIRC it bolts into the extension case part of the gearbox near the top, probably easier to trace breathers back from engine bay. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted July 18, 2007 Share Posted July 18, 2007 The most common source of leaks from the transfer box is the intermediate shaft o-rings. You need to disassemble the box and take out the intermediate shaft, change the o rings, reassemble with a new crush spacer and tighten the shaft as per the manual or something like it. The o rings are FRC7459 and FRC8292. The collapsible spacer is FRC7437. The bits are cheap, but the job is expensive at a garage as the xfer box has to come out. Quote Link to comment Share on other sites More sharing options...
Anglo-Frenchman Posted July 18, 2007 Author Share Posted July 18, 2007 Thanks for all the advice. I really am sure that it is not transfer box as there is consistently oil seepage around the filler/level plug on the side of the LT77 gearbox which is runnig down the side of the box and then being blown back onto the transfer box. I'll have a go at locating the g/box breather and see if that resolves the problem. Quote Link to comment Share on other sites More sharing options...
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