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The mkiv Supra Owners Club

Big oil leak under extreme braking


neilp9876

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Whilst doing a trackday last weekend I got a massive cloud of smoke coming from the car. At first I thought I had killed it but it still runs perfectly.

 

The smoke is coming from oil burning off the exhaust, underneath the drivers seat area so quite far back under the car. Its an autobox and it looked to be in that area.

 

There are no obvious leaks and no large pools of oil or fluids although there are traces around the underneath.

 

Never happens under normal / fast driving. Only occurred when braking as hard as possible from high speeds, i.e the ABS is on full chat (17" toyo tyres in the dry).

 

Are there any breather pipes / over flows or anything around the autobox area? Anything else that could leak under braking from the engine? I would expet leaks to come from the front but for it to be so far back I am suspicious about the autobox?

 

Any ideas, anyone.

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It sounds like you have overfilled the auto box, this is really BAD when you use it on a track as the oil will foam, (and overflow, as you have found out) :) You do realize that you check auto box fluids afyer going through all the gear positions (stationary is fine) them. leaving the engine idling, you dip and check the oil level. If you check it when the engine is not running you will not get anything like a correct level reading. I would drain it to the correct level ASAP, and certainly before it is driven hard.

 

There is no pressure valve, it's just a vent.

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It sounds like you have overfilled the auto box, this is really BAD when you use it on a track as the oil will foam, (and overflow, as you have found out) :) You do realize that you check auto box fluids afyer going through all the gear positions (stationary is fine) them. leaving the engine idling, you dip and check the oil level. If you check it when the engine is not running you will not get anything like a correct level reading. I would drain it to the correct level ASAP, and certainly before it is driven hard.

 

There is no pressure valve, it's just a vent.

 

Good info Chris. I had wondered why my level was high after the car had been stood still for 6 weeks. The last time I checked the level, the car was idling. This time I checked all levels before I fired her up last Saturday.

 

H.

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