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Exhaust Brake

showcrop

showcrop

Well-known Member
The exhaust brake on our Fire depts' 1990 International tanker with 370 Cummins just yesterday started doing something different. For a little while it has seemed "lazy", not coming on as soon as it should, but yesterday it started giving 2 pretty loud individual bangs before operating as normal.
 
Are you talking about a Jacobs engine brake or a real exhaust brake there is a difference. One uses the exhaust for the braking and the other uses the valves in the engine head for the braking force. The jacobs brake Yes Jacobs brake holds the valves open slightly with oil pressure by way of an electric solenoid. The other uses the exhaust gases through the exhaust pipe with w swash plate like deal to hold it back I believe.
 
(quoted from post at 11:23:10 07/06/18) Are you talking about a Jacobs engine brake or a real exhaust brake there is a difference. One uses the exhaust for the braking and the other uses the valves in the engine head for the braking force. The jacobs brake Yes Jacobs brake holds the valves open slightly with oil pressure by way of an electric solenoid. The other uses the exhaust gases through the exhaust pipe with w swash plate like deal to hold it back I believe.
Click to expand...

I don't recall off hand. I will have to check. I had an Isuzu a long time ago that had the valve in the manifold. It made just a chuffing noise, nowhere near the noise that the IH that I had with a Jacobs brake made. I know that this IH is no valve in the manifold deal, but I will have to check the brand.
 
I had a 94 ih with a 370 Cummins. It was a
M11. Just 660 or so cu. It was electronic.
Held the valves open. Check your foot feed
first. Is it coming all the way up turning
it on.
 
(quoted from post at 17:04:57 07/06/18) I had a 94 ih with a 370 Cummins. It was a
M11. Just 660 or so cu. It was electronic.
Held the valves open. Check your foot feed
first. Is it coming all the way up turning
it on.
Click to expand...

The brake comes on maybe just a bit delayed. The issue is the two bangs before it starts to work normally.
 
An exhaust brake is nothing more than a damper in a stove pipe. It is actuated by an air cylinder. On a non computer engine,a throttle switch and a clutch switch wired in a series actuates an air/electric solenoid. If your foot is on the clutch or the accelerator it will not work. On a computer engine the computer controls the solenoid. The banging is probably due to the damper linkage binding or a worn bushing etc. If you have a true engine brake that is another animal all together. I have worked on both many times.
 
(quoted from post at 05:17:56 07/07/18) An exhaust brake is nothing more than a damper in a stove pipe. It is actuated by an air cylinder. On a non computer engine,a throttle switch and a clutch switch wired in a series actuates an air/electric solenoid. If your foot is on the clutch or the accelerator it will not work. On a computer engine the computer controls the solenoid. The banging is probably due to the damper linkage binding or a worn bushing etc. If you have a true engine brake that is another animal all together. I have worked on both many times.
Click to expand...

Welding man this is NOT a valve in the pipe, It is a Jacobs or a Jacobs type.
 
Been a long time since I worked on a mity mouse motor LOL. If I remember correctly it was all electronic
with a Celect system. Sounds like the valves are sticking. Being a fire truck probably not being driven
very much. The proper way would be to pull the valve cover and clean it up, or put some sea foam in it
and drive the tar out of it for a few days and change the oil.
 
(quoted from post at 13:57:56 08/26/18) Did you figure it out?
What displacement is it?
How is the oil pressure?
Click to expand...

We didn't figure it out. It has gone down the road to Tennessee. They got me a brand new Pete to drive :D :D.
 
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