2000 Mack rd688 e7 air compressor help

[Moparmike]

Good evening 

today my driver was hauling asphalt (dump truck) 

and suddenly temp went up truck shut off

he gets out check under the hood 

Fires it back up and the air compressor is pushing water out the side and through the over flow (reservoir) tank 

I’m hoping that it’s just the compressor and nothing internal 

any help or guidance will truly be appreciated 

21 yrs in trucking and I’ve never had this kinda issue 

but anyway 

to get the load off 

we open the valve for the water to flow through the heater core and left the cap loose so the pressure wouldn’t build 

got the load off and truck home 

temp was about  180

drain tanks water and dripping out the air compressor 

none in oil 

 

so am I correct on air compressor 

and if so does this have to be timed like injection pumps 

Again Thank you 🙏🏽 

[Joey Mack]

Most likely, air comp.  keep in mind  There is an oil tube in the center of the coupler and aux shaft.  When you pull the compressor, make sure the tube is in the aux shaft. It pulls out of the compressor coupler with ease..

1/2" by 1 1/2" long....

Edited 54 minutes ago by Joey Mack
Pour sperring

[Geoff Weeks]

It sounds  like a blown compressor head gasket. One thing that can cause that is a coked up discharge line between the compressor and the air drier. Make sure to check and see how well air can blow through that line so you don't blow the head gasket on the new compressor.

When you have the compressor off, disconnect the line from the compressor at the air drier and use an air gun to blow through. It should blow with almost no resistance to air flow. 

[Geoff Weeks]

Another thing to consider, if it did push significant amount of coolant through the air drier, then a complete service of the air drier is warranted. You said you drained the air tanks, was any antifreeze found when they were drained?  

Edited 1 hour ago by Geoff Weeks