As Aron says, the true Jake brake is built into the engine so would have to be built with it.As I remember it , it keeps the exhaust valves closed while on. Some aqre setup to use 2 or 4 cylinders depending on need for braking. The Exhaust brake is simple setup that closes up exhaust up to set level of back pressure. you can use it with stock valve springs or for max braking you need to put in heavier valve springs .Pac brake is one of the popular ones,being used on Pickups,motorhomes and trucks. They have a website you can check for information. John D

The regular Jacobs Brake Co. sells a kit to install on push rod engines as I have installed them on Cat truck engines.They have a control to either use all 6 of the cylinders or only half of them so they don,t have to come from the factory with the Jake already installed on them. Forgot to mention that Cat had a retarder that was built in with the flywheel but with my experience it never really caught on.

Actually I said that the motors with retarders were diffewrent than non retarded motors so I don't believe you could swap one in. Jakes wern't built for that particular engine, and again they can't be added on, But what I was wondering is about an exhast brake, this is a valve that goes in the output side of the exhast system after the turbo and can be regulated for how much it closes off the flow of exchast, many of them were used in the trucking industry before the jakes became a popular item, I've used them and they work well, the draback is that they flow a lot of exhast back into the enginge so oil is dirty faster.

Most of the units for the 3/4 an 1 ton trucks are just exhaust brakes, as stated. True Jake brakes require much engine modifications and are not available for most current diesel trucks.

I thought that the 830s had torque converters and powershift transmissions if my memory is correct I don't think that any type of engine brake would work.
AJ

The Jacobs Brake,was invented by Clessie Cummins the boss of Cummins engines its called the Jacobs Brake as it is made by the Jacobs man, Co, (they also make Jacobs chucks for drills) the brake can be fitted to a wide range of engines including about 8 different Cat motors 3306, 3406, C series the brake works by opening the exhaust valve/s at the top of the compression stroke,releasing the compressed air in the cylinder to the exhaust pipe, instead of this compressed air forcing the piston down on the firing stroke, (hold your finger over the air hole on a peddle bike air pump ,push the handle in then let go ,it will shoot out because of the compressed air trapped inside.) the " JAKE " is a great brake assist item and should be fitted to a lot more engines as it has great function and ability, unlike oil retarders that need improved cooling and are expensive to repair,also have a penalty with weight, the Jake is light effective, low cost,also easy to repair/adjust.
Sadly it is not sold hard in the U.K. if it was made to fit Scania/Volvo trucks it would be taken up by most operators, the Scania Exhaust brake is not great. and can only be used for a limited time, their retarder is complex, heavy/costly. Volvo engine brakes lack power,also are connected to the air system and prone to leaks, the Jake is made to fit DAF trucks but is not sold as it should by the dealers as often the sales staff are crap at there job,
blowing it on, tctractors
P.S. I love the "JAKE"

Jake brakes are nice but from what I remember it wasn't offered as a option on the 3406 lineup until the 3406B engine came out in `83 or `84?? The earlier 3406 had to have the pistons changed or else the top ring gland would break??..something like that I recall. I think that the only reason Caterpillar even thought about using a Jake brake was because California passed a law back in the `80's that went something like any new truck tractor had to have some kind of aux. brakeing besides just the service brakes. So Cat offered a Jake break or a retarder...I know that my 3406 parts book showed a retarder kit that was available at the time. A retarder sure would have been nice when taking either Parley Summit or Donner Pass westbound on I-80.