isx cm871 coolant pressurized

[Waterloo]

(03-24-2016 )gonzo1949 Wrote:  

(03-24-2016 )Rawze Wrote:  

(03-24-2016 )gonzo1949 Wrote:  Waterloo what's the procedure to checking the air compressor?

Bleed the air to zero by opening the tanks for the truck, then place a blocking plate (a silver dollar works) over the intake pipe to the compressor and putting the joint back together.

Then check for pressure buildup in the coolant system.

So the pipe that comes down from the intake correct? How long can I run the truck like that to determine if there's any pressure build up?

I got my truck up to temp, then did the test. You aren't hurting anything, and it will not take long for pressure to build up if you have a head gasket leak. Mine took all of a few seconds to rule out the compressor, but I have a BIG head gasket leak, shooting coolant into the air... Have you done an exhaust gas coolant test yet? I am assuming you think you have a bad head gasket, correct? And if you have not done it yet, I would also do the EGR Cooler leak down test too. I did mine in the driveway with a radiator pressure test kit. It was an overnight affair, but worth it, my cooler was fine.

What is your truck doing that you suspect an issue?