today while I was reworking my cylinder head, I found #5 and #6 exhaust valve only holding 10 Hg, so I reworked the seats and they are back to 25 Hg.

here are some pics of my rebuild

the pictures with the exhaust valve out, that is after I reworked it (on a peterson 25 guide and seat machine)

the picture with the piston, this was the worst of them(just alot of carbon build up)

 

here is before and after pics

 

when you say shaking at idle are you talking about like sitting at a stop light and all of the sudden your truck starts to shake a little? cus i have that problem every now and then some times worse then others

 

Good work Cummins Guy, very nice!

 

If the idle rpms drop too far these baby's will shake like a stripper needing to make a rent payment.Rocky

 

I have that same weird shake when i come to a stop at a light..... sometimes its worse than others also. Its got me confused.

 

so is it something that i should look into and maybe turn up the idle a bit? or is it just something that wont really make a difference other then stopping a little bit of shaking every now and then? thanks
Tanner

 

What's your timing set at? If you increase the timing it will shake the engine a bit more. Although not sporadically... Is your KSB cycling on and off?

 

mine did the same thing. almost like a nasty lope sometimes. especially after getting into it hard for a long shot. i some things i thought of are maybe timing, possible air in fuel issue, or idle too low. i turned the pump up some more to bring my idle up 100 rpm and it seems to be doing better now. i just havent had time to look into messing with my timing yet since its advance 1/8" to the head.

 

Its probably a injector with a bad pop... Clean and pop test your injectors...