I'm getting to that 100,000 mile mark and I'm ready to go ahead and get the valves adjusted. Since I'm no mechanic I will be taking this to the dealer. Any idea what this may cost or how exstensive this is? thanks

 

Do a search. It's not a big job. Many do their own adjustments.
I thinks it's about an hour job (not the first time though), not sure someone will chime in with details.

Pete

 

Its my understanding that a valve adjustment is not needed until 150,000 miles not 100,000!

 

Piece of cake.... there are numerous write ups on this forum to guide you through the process... Just be prepared to lay out on the engine to get to #6

 

Just use the valve overlap meathod to find TDC. And start on 1 or 6. If starting on 1, it would be 1 I & E, 2 I, 3 E, 4 I, 5 E. Then rotate the crank 360* and set 6 I & E, 5 I, 4 E, 3 I, 2 E. I think it is .010 Int and .020 Exh. It has been a while since I ran the overhead on a B Series but it takes more time to R&I the valve cover. It seems like I have been doing more KTA50's and QSK60's lately.

 

My book says first check at 100,000 and every 150,000 after that, but I think Cummins just says every 150,000.

Anyway, here's the details...

Remove the valve cover, rotate the engine with a barring tool or by the alternator pulley until the TDC mark on the damper is at 12 o'clock.

If both #1 valves are loose then #1 is between compression and power stroke, so adjust intake on 1, 2 and 4 and exhaust on 1, 3 and 5.

If both valves on #1 are not loose it's in overlap between exhaust stroke and intake, so you adjust intake on 3, 5, 6 and exhaust on 2, 4 and 6...

Feeler gauge goes between the rocker and the cross arm.

If the gap is within range (Intake is 0.006 to 0.015 and exhaust is 0.015 to 0.030 with cold engine) then no adjustment is needed...

If out of that range, then set intake at 0.010 and exhaust to 0.020. Tighten lock nut to 18 ft/lbs and recheck after tightening.

Then rotate the engine 360 and do whichever group you didn't do...

My guess is that you will find none out of range, but for peace of mind I'd check them...

 

i have what sounds like a timing rattle. ever with my bowx removed. could this be valves out of adjustment? or do i have bigger issues. the truck now has 125k on it