Bought my truck 3 1/2 years ago. First year Jake brakes constantly cut out on brake stages when using Jake , so I just didn't use it much. Had over head done had it fixed or adjusted. Worked for 2 weeks. Started again.
Last year did ole school overhaul , had jakes fixed again. Wiring harness end was loose. Mechanic fixed it. It last a year. Now it's doing it again.
I was told there was 1 Jake wiring harness. Someone said there were two.
New one are $300.00 at peterbilt.
How many do I need. ? 1 or 2.
I'm tired of not having jakes working ,
Was told after a while the harness wears out due to heat. Which I can see that.
But if it was fixed and lasted a year after it failed couple other times. Then aparentaly the latar of the mechanics knew what he was doing.
So to save myself some money.
Can you just buy the ends and replace them if that can even be done.
Thanks in advance.
03 Pete 379 6 NZ 18 speed , Jake Brake issue
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Tripple7, Jun 26, 2017.
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Replace the Jake harness, it is worn out. The other harness is for the injectors. If your motor idles rough and surges, then once you regroup from the jake harness move to the injector harness. There is also a harness on the outside,(drivers side) of the motor that wears out with time.
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On a 6nz it's all one harness under the valve cover. Just replace it. It's probley in the plug at the spacer plate.
Diesel Dave, Oxbow and The Admiral Thank this. -
Sorry for the mistake, couldn't remember how that went.
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Oxbow and The Admiral Thank this.
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Great. Thanks so much.
Now question.
Is it something I can do myself. Without special tools. I pretty mechanical on my truck at doing a lot of minor stuff . If I take off valve covers. Is it right there. And do I need to torque the cave covers back on. ? -
Very easy.
You take all 3 valve covers off.
Then take the spacer plate under the valve covers off.
The harness is in that spacer plate.
Just re and re and bolt it all back together. Not hard. I'm sure there is a torque spec if you Google it.. I just use my built in torque wrench. My arm.
Just snug them down with a 1/4 inch ratchet.Last edited: Jun 26, 2017
Diesel Dave and Oxbow Thank this. -
I made a video of it. But it won't let me post on here -
The ticking noise is when your on the jakes or just running?
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