Hello friends,
First time poster here. Was wondering if anybody can confirm if I have these toque specs correct. I am doing some fuel injector and electrical diagnostics and just put it all back together under the valve covers. My Jake housing on the 3406E (6TS) is 340A. I have 4 mounting bolts and 2 rear nuts (pictured below). I know these all have different names, but to avoid confusion I am mentioning placement.
I believe they all torque down to 80 ft lbs, more specifically 50 ft lbs - 1/4 turn - 80 ft lbs
And the valve covers bolts along with valve cover base 13 ft lbs.
Also notice the one mounting bolt is a different diameter? This is the only model I’ve seen this on, anyone know what that’s about and if it’s torqued the same? I would think so. I’ve circled all mounts, the orange and red is the smaller diameter bolt. I believe it’s 5 or 7/16 off the top of my head and the rest are 3/4” and the nuts are of course larger.
Thank you anyone that has any input!
3406E Jake Housing mounts torque specs
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Straight Diesel, Jul 16, 2025 at 8:00 PM.
-
Attached Files:
W923 Thanks this. -
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
-
I am almost certain your cover bolts at 13 is correct though.
Is that bolt actually a different diameter at the thread or just for some reason have a 12pt head -
I called a CAT shop and that’s where I got the 80 ft lbs from and they sent me a snap shot of the quick guide which had me confused for a moment. Anyway I tightened all down to 80 and honestly when taking them off they felt way tighter.
And after all that I must have messed up setting the housing back in, looked to all be lined up, but the engine is turning but won’t fire. So now I have to start over on that or do an overhead.
Never done any of this before, but it seemed simple enough. I took my time.
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.