How to test the jake brake on a 1999 Mack E7?
How to test the jake brake on a 1999 Mack E7?
Use the same wire and hold the wire to the connector while the engine is running this should activate the Jake and the engine will studder. Do this one head at a time. Try this before and after you readjust the Jakes to see if you can hear a difference. This is just a quick way to see if there is a difference with out a road test.
What should I do if my Jake brake is not working?
With the key on engine off remove the Jake wire from the spacer and tap the little connector stud with power, you should hear the click. Do it to both heads, no click means bad solenoid or solenoid wire.
What’s the clearance on a 1999 Mack Jake?
There is also an external oil line kit you can buy that runs oil from the oil filter housing to the Jake Housings. The Jake kit called for a clearance of .015 ( but I can go .021), the o-rings on the solenoinds were replaced in both the front and rear jake.
Why did Mack stop using the oversized bearings?
Mack stopped using the oversized bearings because techs were not measuring clearance before installing bearing and on some locking engines up , Mack’s crank sizes were all over the place on early etecs that’s why some had good oil psi and some not. BMT Certified Know-It-All!
What are the brake issues on a 1999 Mack E7?
The cylinder head has been replaced, the valves have been adjusted as well as the Jakes, however my current issue is the Jakes. When driving down the road and the Jakes are applied, there is a delay (long) or sometimes the Jakes don’t work at all.
Do you need a cast elbow for PacBrake exhaust brake?
Vehicles with a 90° header pipe use a cast elbow to interface with the stock header pipe. Pacbrake offers replacement header pipes for some truck models. What is a fixed orifice exhaust brake?
Where is the NPT port on a PacBrake exhaust brake?
Every Pacbrake exhaust brake has a 1/8″ NPT port tapped into the side of the exhaust brake housing. It has a port plug threaded into it from the factory. Remove the plug and install a back pressure gauge to this port. Go for a test drive and observe the backpressure readings. My exhaust brake comes on at idle. Why is this?
With the key on engine off remove the Jake wire from the spacer and tap the little connector stud with power, you should hear the click. Do it to both heads, no click means bad solenoid or solenoid wire.
