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98 Pete w/ Cummings c8.3 jake brake help

dadanddaughterexcavation

dadanddaughterexcavation

Well-Known Member
Joined
May 20, 2021
Messages
103
Location
NH
Occupation
owner/ operator at Dad and daughter excavation
Tyler d4c said:
That is not a jake it is a exhaust break. All the switches do is operate the valve in the center right of your second picture. It then shits a butterfly valve in the exhaust after the turbo.
The butterfly valve could be hanging up when it's hot
The valve may be getting weak when the solenoid gets hot.
I was looking at the pictures thinking thats a rust free truck truck then remembered that I live in Pennsylvania and most trucks with a 8.3 in them are piles of iron oxide by now.
Click to expand...
So after further testing it only stops working when motor is hot (180+) so I think the butterfly valve is hanging up how do I confirm that?
 
B

Birken Vogt

Charter Member
Joined
Nov 30, 2003
Messages
5,324
Location
Grass Valley, Ca
I assume it has 1/4 inch air line to the little piston. I would disconnect it from there and run it into the cab with some more 1/4 inch line or whatever you have laying around. Then drive it and get it real hot (you will have no exhaust brake during this time) and attempt to apply it and you should still have the same amount of air whooshing out the line as you do when cold and attempting to apply.
 
dadanddaughterexcavation

dadanddaughterexcavation

Well-Known Member
Joined
May 20, 2021
Messages
103
Location
NH
Occupation
owner/ operator at Dad and daughter excavation
Birken Vogt said:
I assume it has 1/4 inch air line to the little piston. I would disconnect it from there and run it into the cab with some more 1/4 inch line or whatever you have laying around. Then drive it and get it real hot (you will have no exhaust brake during this time) and attempt to apply it and you should still have the same amount of air whooshing out the line as you do when cold and attempting to apply.
Click to expand...
I will admit sometimes things go over my head on this forum but that was a perfect explanation I will try that ASAP.
 
B

Bluox

Senior Member
Joined
Jun 19, 2010
Messages
1,960
Location
WA state
dadanddaughterexcavation said:
I flip the switch on and the Jake brake does not come on.
Click to expand...
Start the truck and build air pressure,
turn motor off and turn key back on.
Turn brake on,air gauge should flicker.
Turn brake off should hear cyl. release and air exhaust.
with brake on push throttle, same noise
throttle off push clutch same noise.
Or have someone watch exhaust valve.
Warm motor up to where it quits working and repeat checks.
Bob
 
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