jake brake question????

I'm with Les on this, I've never dealt with the 346 but I think the most obvious differance is the 346 has 3 fastening points while the 349 has 4 fastening points.

 

I thought you had to be rolling in gear for the jake to work. Don't think just revving engine will activate it.

 

It will, remember it's a mechanical motor. If the oil pressure is high enough at idling it will activate.

 

I've never messed with the 346 but I would check adjustment before getting to far into it.

 

Puncher gave you the specs .067". I you dont trust it, you can adjust it while it's running. Turn the adjusting screw while it's running, untill it starts to grab, turn it a 1/4 of a turn back, that's the way whe do it on the old Cummins'

 

You don't adjust them under the housing, look on top of the housing and you'll find six 9/16 nuts with a slotted stud, follow the instructions given earlier and you'll be fine.