Smoky

[OrneryOrr]

'83 M923, Cummins 250, is it normal that it smokes like Uncle Al on poker night or is it needing attention?

 

[simp5782]

Take a video and post it. A small cam and even a big cam will smoke at idle. Slight blue haze is not uncommon

 

[sandcobra164]

I'd like a video as well but have some history with a smokey M923 with a NHC-250. I tried foolishly to run 50/50 waste ATF and Diesel. The mixture was clean and filtered by a centrifuge set-up that passed first through a 30 micron filter, centrifuge, 5 micron and finally a 2 micron finishing filter. Cleaner than at the pump. My truck ran fine at first but eventually loaded up to the point that oil was dripping from the exhaust clamp underneath the cab. I also used to let it sit and idle while I mowed the front yard. "Maintenance Idling" is a term used by generator people who idle equipment without a load. In my case I created a condition known as "Wet Stacking". It smoked an awful amount when being driven, idling, etc. A few tanks of straight diesel and hard driving cleared my problem up.