Jake Brake Issue

instead of repairing the wiring harnesses you should have replaced them. I replaced both injector and vva wiring harnesses, it did wonders . if ya went thru all the trouble to replace the injectors and didn't put new wiring harnesses on at over a million miles, you wasted your time, expecially after having had to repair several times. think about it.

the common denominator is the only thing you haven't replaced completely actually makes the thing work correctly, which is why it will do ok for 60 or 70 miles, the harnesses would be about 154.00 each

 

I agree. All the troubles you had with that harness you probably are missing hidden damage. Over a million miles running to an engine that has vibration them wires have a lot of miles themselves. Plus with known overheating there is no telling the shorts and arcing you had. Every time they work on it they move the harness.

You could remove it completely and ohm the wires out while moving it around. I bet your meter will jump.

Spend the money on a new harness and if it don't fix your problem skateboard said he would reimburse you.

 

Lol, I was having vva codes flash, and my jakes also seemed to be weak, I broke 2 bolts in the rocker assembly, and while in there I replaced all the bolts( known problem with c15, they have a updated studs and bolts, replaced both harnesses at the time this work was done and it made a huge difference.

 

Recon87,

I am in Engineering Product Support at Jake Brake and am contacting you after reading your post about the issues you have been having with your engine brakes. We experienced a similar issue with the same engine that we were running here in our dyno lab. I would like to give you some input even though the brake on that engine are not "JakeBrake" products. Those brakes are actually manufactured by CAT for use on that engine. That being said, I agree with the comments that say that you should replace the overhead wire harnesses. We found that over time the harnesses tend to get brittle due to repeated heat cycles and will create intermittent connections to all components under the valve cover. A CAT dealer should also be able to determine what is actually happening when you activate the brake and prevent you from "throwing parts" at this to get it fixed.

Please let me know if I can be of any help to solve your problem.

Don Shaia
Engineering Product Support
Jacobs Vehicle Systems'
860-769-7806
dshaia@jakebrake.com

 

Hey everyone, even tho im thinking of opening up a whole new other page, my topic has so much to do with this topic that I thought id just respond. I have a 2006 international with a C15 cat engine in it. a couple months ago it was an issue that the oil level in the pan kept rising, so I removed valve covers, I removed jake brake heads and all injectors, replaced all O-rings and reassembled. the engine ran fine and it no longer did it leaks fuel into the crankcase. however, ever since my jake breaks don't work. I have double checked all my connections and everything seems ok, I over heard a couple of the guys saying that they have needed to bleed jake heads to get them to work again because they may be somewhat air locked. so my question to you guy are the following:

1) How do I check that the jake brake solenoids are receiving power to make sure that the electrical portion of this system is working properly?
2) How do I bleed the system?


any help at all will be much appreciated

 

anyone? commonnnnn

 

remove valve covers, remove wires to jake solenoids. get two wires one pos one neg touch the solenoid this will activate the solenoid. put a rag over the jake housing see the little plate with the dent held by the allen head screw? oil will spray out from here. do this with the engine running. if you have an issue with the electrical it will throw a check engine light while the jakes are operating.

 

right on, well an update is that I brought the truck into the shop, I removed valve covers and tested voltage at the solenoids and I had 12 volts so I ruled out the electrical.
after I did the injectors I guess I must have not bled it or whatever even tho I don't think that there is a way to bleed it, while troubleshooting I had my buddy in the cab reving the engine up and letting the throttle go. about 50 times he did that u could hear the jake brake slightly work, kept doing this and eventually they came back, working fine. so there musta been an airpocket in the jake heads because I did nothing to it but rev the #### out of it and they worked.

 

I tried to repair the wires leading to the rear solenoid as they were damaged. It didn't even hold up to the road test. I changed the harness but that came upto about $400 (mind you this was in Fort Mac), after that all was well. Hooked up the computer and it showed 99.96% effective.