Jake Brake Question

I think you might be on to something! Operators manual mentions it twice, once in "Instruments & Controls" section once in "Starting and Driving". I attached some photos, but...

In that second section it mentions an exhaust pressure governor so that might lead me to believe it's an exhaust brake only and not a compression brake. Also, the service section (which lists valve clearances, how to set injection timing, and more) has no mention of clearances or adjustment for compression brake equipment.

Would I have smoked when gassing it if it was an exhaust brake only? Does an exhaust brake still make noise? It definitely gets louder and makes a jake-like noise when on, but not as loud as a tractor of course.

The switch definitely uses air pressure, but I don't think that tells us much.

 

Here's where I got the numbers (photo attached).

More thoughts:

• I read that most smaller diesel engines (this is a 334ci) don't have jakes.
• I read that most engines with exhaust brakes don't have jakes as well, and that makes sense since they'd kind of counteract. I see some later volvo have both but they have fancy electronic control systems and I imagine don't use both at once.
• With the jake on not sure how I'd have enough compression to even limp at 5mph weighing 10-12tons. Unless it's only some cylinders, but this is a single stage.

 

And the high egts / load would've spooled the turbo -> deactivating the smoke stopper -> ramping up the injection pump -> leading to the smoke out my exhaust.

I figured a lil too lqte I might be a little too small time for this forum lol. Sorry for the confusion and thanks for the patience, reassurance, and advice everyone.

Thanks man. This is my first foray into a truck this size, diesel motor this size/age, and air brakes. I definitely might have some more questions in the future. Have to fix some instrument panel issues.

One things for sure this old truck is a keeper! It's 1 of 3 built, half RV half horse trailer. I use it to camp, haul toys or personal loads, and soon as a race car hauler. Figuring out a ramp situation / assessing the weight capacity of the hydraulic back door when it's down.

Love me some MacGyver fixes like this. My best was using jumper cables as a ground after figuring out I had a rotted ground strap. Everything worked but the starter lol.