whskypete

I would contact Jacob Brakes, they may give you more information.

3237289414 is my fax

It sounds like the oil kit is the way to go, however I have never done this, are there any mechanics in Southern California (L.A) that have done this? I know there is a MACK dealership near by but I don't want to send my business away. Or is there any online information? Any help is always appreciated.

Well, thank you guys for the information. I will start with the solenoinds and work my way from there. The new Jake Kit includes longer studs which through me off at first. I'll keep you guys posted in what I find. The truck will be returning next week for a follow up.

Thanks again

Oh, yes I had the problem before the repairs. The repairs were done because when the Jakes were removed we noticed metal debris from the springs on the head,

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. I'll have to double check on the oil pressure while I am driving. The tractor has between 250K miles but less than 275k miles in it. It was purchased from Boeing, so I imagine it was well maintained. I have never done the oil supply line to the Jakes before. Where should I go from here?

The plugs on the rockers were in, but I'll double check when the customer brings it back in a few days. The plugs you are referring to are on the end (sides) of the rockers. Correct?

Happy Sunday to all, I am still working on this Mack E7 (ETECH) 350 HP with Jake Brakes. 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. I have installed a factory Jake Brake Kit which replaces all the springs, valves, washers, upgraded check valves (front rocker and rear rocker), o-rings and a number of other things but not the solenoids (not included in the kit).

Could my solenoids be the issue causing the Jakes to sometimes work and then not work? At idle, there is a small amout of oil coming from where the solenoids sit on the Jake brake housing (is this normal)?

Oil pressure at operating temp and idle is about 20 psi, which is within spec.

Any ideas would be greatly appreciated, please help me with this issue.

Thank you,

Pete

etech

I will find out first thing in the morning and reply first.

I was hoping for some help, I have a 1999 CH613 with a E7 350HP. I had to remove the front cylinder head and now need the specs to put it back together. I've done this kind of work on Cummins N14 and Detroits S60 but never a Mack. Can anyone please help me with the cylinder head bolts (torque specs and sequence), rocker arm assembly (torque specs), Jake Brakes (torque specs) and last the order in which to do a tune up (valves, intake and exhaust and Jake).

I know it's a lot to ask but I would appreciate any help,

Thank you

Pete