mack88 Posted January 3 Share Posted January 3 i've put two rebuilded air compressors on my mack E6 350 both pump oil was wondering if getting one from Mack be better.dryer leaks oil have to change cartridges quiet often. Quote Link to comment Share on other sites More sharing options...
Popular Post Mackpro Posted January 3 Popular Post Share Posted January 3 On trucks where the air compressor gets it’s fresh air from the piping between the air filter housing and the turbo, we see guys running dirty air filters and the engine is sucking for fresh air so hard it pulls oil up past the rings on the air compressor which pumps it into the air drier/air tanks. Very common on the 2003.5 -2007 Aset Ac engines . Could also happen to any truck with air compressor getting its fresh air this way. 3 Quote Link to comment Share on other sites More sharing options...
mack88 Posted January 3 Author Share Posted January 3 keep air filter serviced.Good advice tho wouldn't have thought of that. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post JoeH Posted January 5 Popular Post Share Posted January 5 Dont waste your money on air compressor from Mack, it'll do the same thing. My 1979 endt676 does the same thing. We put a dryer on to try and keep the tanks clear, but it makes so much oil it was leaving stains on customers' driveways so we pulled it right back off. E7's forward actually pull the air compressor intake line off the intake manifold, so they're actually getting boost pressure off the turbo. Plumb your air compressor supply line this way and it may help with the situation. There's a whole science behind piston compression rings, they're slightly sloped so that more pressure actually helps press them against the cylinder walls harder for better sealing. Or at least an engine textbook I inherited from my deceased uncle says as much. 3 Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 11 Share Posted January 11 On 1/3/2024 at 10:24 AM, Mackpro said: On trucks where the air compressor gets it’s fresh air from the piping between the air filter housing and the turbo, we see guys running dirty air filters and the engine is sucking for fresh air so hard it pulls oil up past the rings on the air compressor which pumps it into the air drier/air tanks. Very common on the 2003.5 -2007 Aset Ac engines . Could also happen to any truck with air compressor getting its fresh air this way. My '79 endt676 we tried a small filter they make that goes right on the compressor, so it had an intake independent of the engine. Still pumped oil. 1 Quote Link to comment Share on other sites More sharing options...
Geoff Weeks Posted January 29 Share Posted January 29 When I see an air problem 1st thing I check is how well the truck holds air going down the road. Take it out on the expressway with a trailer (if it is a tractor) in light traffic and see how long it runs between gov cycles (blow off if it has an air drier) On the highway without using brakes, it should go a MINIMUM of 15 minutes between cycles, if it can't do that, all other "fixes" will fall short. I realize a truck in town is going to use more air than a truck on the highway, but if the system leaks going down the road, then it will use more in town. Most trucks I see fail this test if they are a few years old or older. I had mine, at one point, air ride truck and trailer, air start, go 45 minutes between cycles, that was one tight truck! 30 min is about the best I can keep mine to. Quote Link to comment Share on other sites More sharing options...
mack88 Posted February 1 Author Share Posted February 1 replaced with new one was told to open tank run at 1100 rpm for half hr to break in the rings thanks for the replies. Quote Link to comment Share on other sites More sharing options...
JoeH Posted February 4 Share Posted February 4 On 2/1/2024 at 10:40 AM, mack88 said: replaced with new one was told to open tank run at 1100 rpm for half hr to break in the rings thanks for the replies. Let us know if this one pumps oil too.... Quote Link to comment Share on other sites More sharing options...
mack88 Posted February 4 Author Share Posted February 4 Its doesn't seem to be pumping oil builds air a bit quicker.Mack mechanic told me a guy replaced compressor on cat engine he let it run 1 hour to break in he said compressor was so hot. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted February 4 Share Posted February 4 The 'Break-in' procedure you talk about is new to me.. Heck if it works, then great... Quote Link to comment Share on other sites More sharing options...
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