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Topic: Adding a Jake brake  (Read 4913 times) previous topic - next topic

Re: Adding a Jake brake

Reply #20 –
Today I got the valve crossheads change, the injector adjusting screws changed and the valves adjusted. They were all too tight.
Then I finish off installing the jake spacer. 

Re: Adding a Jake brake

Reply #21 –
Quote from: oldguy –
the valves adjusted. They were all too tight. 

That is a common thing on the engine after 50 or 60K and needs to be checked on a lot of coaches. Sounds like you are progressing nicely and should be finished pretty quick with what you have gotten done up to this point.

Mike

Re: Adding a Jake brake

Reply #22 –
Finished the mechanical side of installing the Jake. Now comes the wiring which will take quite a bit
of figgering out. One thing I need to know is my engine M11 celect or M11 plus celect. I will want
to operate from a foot peddle. I don't mind if it would work on cruise automatically, but out of cruise
I need to be in control. Then I will have to take it to Cummins to program the computor.

Re: Adding a Jake brake

Reply #23 –
Call Cummins with your engine SN: Cummins 800-286-6467 

Re: Adding a Jake brake

Reply #24 –
Quote from: oldguy –
Finished the mechanical side of installing the Jake. Now comes the wiring which will take quite a bit
of figgering out. One thing I need to know is my engine M11 celect or M11 plus celect. I will want
to operate from a foot peddle. I don't mind if it would work on cruise automatically, but out of cruise
I need to be in control. Then I will have to take it to Cummins to program the computor.
A '99 is an ISM.
 Celect plus ended in 1997

Cummins M-series engine - Wikipedia

Re: Adding a Jake brake

Reply #25 –
Nope.  My '99 is a Celect Plus.

Re: Adding a Jake brake

Reply #26 –
I am going to call Cummins today, I need to make sure of the wiring and talk about getting the computer set up.

Re: Adding a Jake brake

Reply #27 –
Post the model of your engine after you speak to them. If you have an old stock '97 engine it would be a select plus. I don't know how far in advance Foretravel was stocking engines.

Re: Adding a Jake brake

Reply #28 –
I talked to Cummins this afternoon. My engine is a Plus Celect M11. It looks like I just have to wire it up and it should be good to go.
If I want the Jake to work automatically on cruise I might have to go in. While I was checking the engine out yesterday I noticed the
Tac wasn't working but it was on the Silver Leaf. I also today welded a crack on the engine oil fill tube. It has been welded before
so when I put it back tomorrow I will see it I can install a brace.

Re: Adding a Jake brake

Reply #29 –
Looking for wires going to the back. I have 4 right at the rear of the coach that aren't being used but EX4 2088 wire must be broken
as there is no continuity. Wires EX1, EX2, EX3 and EX4 38492 they are with 2088 wires under the dash does anyone know where they go.

Re: Adding a Jake brake

Reply #30 –
Thanks to Craneman he sent me a message to check my book and the 38492 go up to the TV. The book also states that 3 wires
go up to the middle dash from the EUC. Now it I could only find them. The EUC has written on it Celect Plus. Working around
the EUC and figgering out wires from that, is going to be harder than installing the Jake.

Re: Adding a Jake brake

Reply #31 –
Well I have been working on figgering out how to wire the ECU for the Jake Brake. The 2 wires going the the Jake is real easy. Just had to plug it in and the wires going to the switches I think I know how. As I'm going out to Cummins to pick up some female clips
to attach the wires to the ECU the service tech said he will make sure I get it wright. We have a really good service tech here. He knows
his stuff. I also ordered a foot peddle from Amazon so I will be able to run manually or have it come on when the throttle is released
which will work that way on cruise.

Re: Adding a Jake brake

Reply #32 –
Got the wiring done at the ECU today. Picked up wire clips for the ECU and hooked up two of the extra wires from the rear of the
coach. The third wire I need goes from the ECU to the IPX Master wiper controller which is a common ground. So the rear of the
coach is done and all wires are run. The foot peddle has come and I will wire it parallel to the on/off Jake switch. So when the
switch is on it will work automatically and when the switch is off it will work manually from the floor switch. I just have install all the
switches and hook up the wires and  its done.

Re: Adding a Jake brake

Reply #33 –
Finished the wiring today. The switches are really handy. The selector switch is a 3 position switch but only 2 work. A a M11 is
has only 3 cylinders or 6 cylinders. That was the switch that was in the truck the the Jake came from. The foot switch isn't screwed
down yet. I will drive it before so I know were it works the best. I will tile it some day to match the floor. I will post after I drive
how it works. That will be a few weeks away. Tomorrow start another project.

Re: Adding a Jake brake

Reply #34 –
Old Guy (that could apply to most of us),

Our Jake switch also has three positions, OFF, 3 cylinders or all 6 cylinders. I just keep it on the 6 cyl position. Your engine is 2 liters larger than ours so you may get a bigger benefit from the 3 cylinder position.

Pierce

Re: Adding a Jake brake

Reply #35 –
Major difference in engine braking I would think between a 552 inch v6 2 stroke and a 659 inch inline 6 four stroke engine.

Re: Adding a Jake brake

Reply #36 –
But we don't live down in "Shaky Town" where it's so flat a tsunami would flood all the way to Vegas. We don't have a flat spot for 60 miles until we get to Sacramento. Our little 9 liter with toad does great with the Jake. Could not ask for more.

But, an 11 liter 4 cycle engine would allow a heavier coach and toad to go on the same roads so I have to grudgingly agree.

Just a case of North vs South. :D  :D

Pierce

Re: Adding a Jake brake

Reply #37 –
Seems on the jake the bigger the torque the more the retardation?

Re: Adding a Jake brake

Reply #38 –
The Detroit 2 cycles unlike a 2 stroke motorcycle are torque kings at low RPM. It's mostly cubic inches that determine the amount of Jake breaking the engine has.

In a gasoline car, it's vacuum that slows the vehicle. With a diesel it's the compression that does the trick. As the piston comes up to the top of the compression stroke, an actuator opens the exhaust valve(s) just before TDC and the high pressure in the cylinder is released so all the work done by compressing the air goes into a braking effect. The bigger the displacement and the higher the RPM, the more braking you get from a Jake. With a 2 stroke diesel, the Jake gets to take advantage of the engine compression on each stroke. With a 4 stroke, every other stroke. I would be interesting to put two engines of the same displacement with one a two stroke and the other a four stroke and see which one developed the more braking effect.

Better than my explanation: http://www.svfd.net/SVFD%20Files/Articles/Engineer/An%20engine%20brake%20is%20a%20hydraulically-operated%20device%20on%20a%20diesel.pdf

Pierce

Re: Adding a Jake brake

Reply #39 –
Quote from: Pierce & Gaylie Stewart –
Old Guy (that could apply to most of us),

Our Jake switch also has three positions, OFF, 3 cylinders or all 6 cylinders. I just keep it on the 6 cyl position. Your engine is 2 liters larger than ours so you may get a bigger benefit from the 3 cylinder position.

Old guy, I got that nickname from mountain biking when in my fifties when I was doing black diamond runs and in my sixties I was
doing double back diamond runs.
I don't know where I will leave the switch. In the one position at first. And you later post what works the best with the Jake, 2 cycle
or 4 cycle. A good question.