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Detroit Diesel 6 V 92 T Tony 10-15-02  
I have a problem with my Engine It leek's excessively out the Air Box tubes, and I have been letting It Idel quite a lot lately at slow Idel, It Is makeing Oil and has turned Grey looking, but theres no water In It, I have sent the Oil off for to get It annalized and the report should get It back In a fue dayes, does anybody have any suggestions, Thanks
Re: Detroit Diesel 6 V 92 T Joe 10-15-02  
It is common for a Detroit to "slober" oil out of the air box drains when they idle for long times. The lower oil rings will loose some oil when there isn't much pressure (like at idle) in the air box. Initally when the 92 series was built, the drains were routed back into the crankcase with check valves. Problems arose when the upper "O" rings started to weep some coolant and the result was a mixture of oil and a slight amount of coolant. Then bearing failure, as the coolant was mixed with the oil and lacked the lube effect. Also, the blower has a piston type oil seals, and when these start wearing, oil will leak past them into the air box.
Re: Detroit Diesel 6 V 92 T Mark O. 10-19-02  
Your real problem is idling your engine for any period of time, particularly at slow idle.

On new 'puter controlled engines, the engine will shut down automatically after an average of three minutes. This is done not only for air quality concerns and saving $$$ on fuel but more importantly, extending the useful life of the engine.

At idle speed, particularly slow idle, a 2-cycle DD makes very little heat and very little oil pressure. With low heat, the engine doesn't burn the fuel efficiently and causes a lot of unburned fuel to leak past the rings into the lube oil. Over time, this dilution of the lube oil decreases already low oil pressure. The thinner oil also is then better able to leak through every knot hole in the engine.

Why are you idling for long periods?

If you need to charge up the batteries, get a battery charger. If you need air pressure, get an auxillary air compressor. If you need to keep the engine warm, get something like a Webasto auxillary heater. All three cost less new retail than a rebuild on a 6V92.

Good luck and happy trails.

Mark O.
Re: Detroit Diesel 6 V 92 T Roger 11-12-02  
I found your response interesting as I am looking at a boat with 1979 6V92 Engines. Would these engines have the air box drains you mention into the crank case ?? Not sure when DD started making the 6V92. I understand "early" models had some trouble but later ones are great engines. Just trying to find the time line between the good and bad befor I make a very costly mistake..
Re: Detroit Diesel 6 V 92 T Praful Das 5-11-09  
Unit- 16FF001173
Model- 8163-7305

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