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 March 12 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 March 12 by Geoff Weeks

[Moparmike]

11 hours ago, Geoff Weeks said:

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?  

Yes 

I have a new filter to go in it 

I plan to pull the lines blow them out with shop air 

I appreciate all the help 

got it ordered today from Mack 

pick up in the am 

[Moparmike]

14 hours ago, Joey Mack said:

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....

I appreciate the help 

 

 

you still working on these old dogs 👁️👁️

I’d like to get some bearing rolled in and a overhead tan on the old dog

 

i replaced the rear stand several months back and I’d like to keep the old dog healthy 

if so let me know I’ll drive it out once I get the air compressor on and done 

Thank you 

[Joey Mack]

Im not doing any work on them right now..  I have too much to do to my own trucks and the house..  

[Moparmike]

50 minutes ago, Joey Mack said:

Im not doing any work on them right now..  I have too much to do to my own trucks and the house..  

I totally understand that and appreciate your help 

and all the others as well

[Moparmike]

Ok guys I’m in need of more help 

replaced the air compressor new from Mack clean all lines with air and changed filter 

put the truck back to work this morning 

it’s pushing  oil out the breather on the spinner housing 

never had this problem before 

oil pressure was normal around 25/30 hot idle and 50/55 driving 

still has same pressure 

am I doomed here or am I over looking something that needs cleaning 

I’m going to pull the blow by filter clean and check it once it cools down 

Thank you

[880joe]

When mine did that it was a low liner 

[Moparmike]

11 hours ago, 880joe said:

When mine did that it was a low liner 

So my engine is pretty much shot 

need a in frame 

 

[Joey Mack]

You can drop the oil pan and pressure test the cooling system to 16 P.S.i. and look for coolant leaking around the bottom of the liners.  

[880joe]

If you wind up needing an engine I have a rebuilt one that has never been installed or Joey Mack might be able to help you out 

[fjh]

3 hours ago, Moparmike said:

So my engine is pretty much shot 

need a in frame 

 

?????

[Moparmike]

10 hours ago, 880joe said:

If you wind up needing an engine I have a rebuilt one that has never been installed or Joey Mack might be able to help you out 

Pm me some information on it 

Thank you 

[Joey Mack]

Mike, I have a long block that is built with steel lifters and the high horsepower cam key installed.  

I also have the bolt-on parts.  PM 880joe and keep me in the loop..  

[Joey Mack]

F.Y.I. this is NOT a rattle can rebuild.  I measure the journals, and conter bore depth and I also dress the counter bores and shim the liners. These liners are within .002" across the deck. I also have all my notes on paper from diss assembly through reassmbly. The heads are spot on as well.  Just a little insight on this one. Jojo

[fjh]

I’m still trying to understand how he came to needing an engine! From a compressor??????

[880joe]

I don't know that he needs an engine.But I do know that I needed an engine with similar symptoms. Liner low caused overflow reservoir to push water out, water in oil caused crankcase to plug up with snot looking water/ oil mixture then that caused oil filter housing breather to leak because it couldn't breathe out the blowby. That was my experience in the past