Replying to Thread:

ISX Jake Brake

Created On Tuesday 8, February, 2011 7:01 AM by Dieselhawk

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Dieselhawk

Posts: 98
Joined: Sep 2009

Tuesday February 08, 2011 07:01

Can anyone tell me which cylinders apply to the three Jake Brake settings on an isx? Obviously High is all 6 but was wondering which cylinders are activated on medium and low. My guess is low-4,5+6 medium-2,3,4,5+6
I have an engine which is Jaking harder on the low setting than the medium setting so just wondering which extra cylinders are cut in on medium.
So far I have changed the control valves and springs and also swapped solenoids.
Cheers

-------------------------
Dieselhawk

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westcoast

Posts: 982
Joined: Dec 2008

Thursday February 10, 2011 03:41
I,ve been through my books and the only info is in a percentage on a 3 way switch - low 33% Med 67% High 100% no actual cylinder numbers Regards David ------------------------- detroit

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JoeZ

Posts: 938
Joined: Dec 2008

Thursday February 10, 2011 05:07

I'm not positive, but I believe it doesn't go by cylinders. It goes by revolutions.
It goes every revolution on high, every second revolution on medium, and every third revolution on low. That's how it was explained to me....but that was from a very knowledgable parts man at Cummins. It made sense....but......I have never read it anything except what westcoast said.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.

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Dieselhawk

Posts: 98
Joined: Sep 2009

Friday February 11, 2011 03:29

Thanks guys, I ended up using the website "Just Answer" and also calling the Cummins Tech line and they both came up with the same response...
Low =cyl #1
Med = cyl #2+3
High = all cylinders

Now I just have to work out why Medium sounds like it is Jaking on one cylinder and Low sounds like two.
So far I have tried swapping solenoids and I have replaced all six control valves and springs.

Cheers

P.S. you can't get the wiring back to front so that's not the problem.

-------------------------
Dieselhawk

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theakerstwo

Posts: 149
Joined: Jan 2009

Sunday February 27, 2011 16:42

<< I,ve been through my books and the only info is in a percentage on a 3 way switch - low 33% Med 67% High 100% no actual cylinder numbers Regards David >>

This is what i was thinking also. Some trucks and freightliner is one of them will have a six position selector switch. The engine brakes have three selnoilds with three circuits to them. So you can get six setting with three senolds unless you use a ever other strke on some of them for six selections.Some trucks only have three postions for the selector switch.

Edited: Sunday February 27, 2011 at 17:43 by theakerstwo

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hkemac

Posts: 21
Joined: Apr 2011

Monday April 18, 2011 03:44
CUMMINS Diesel Engine mayof some help for you ------------------------- diesel engine, engine parts and generator set export-www.emacsz.com

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