-Boostjunky-
Boost-A-Holic
- Joined
- Apr 26, 2009
- Messages
- 132
Hey guys. Most pertinent mods done to my truck are in my sig.
Here's the issue I'm having. After putting the fresh motor in the truck, I set the valve lash to .010 (I), and .020 (E). After about 1800 miles, I started to notice a slight pop noise coming from the exhaust. It ALMOST sounds like a miss, but it's not mis-firing completely.
I suspected some possible valve-train adjustment issues, and upon re-checking the lash settings, I found exhaust rocker arm # 3 to have over .040" clearance. Obviously this is unacceptable, considering I just barely set them to .020 (E).
So, I readjusted it to .020", and the pop noise in the exhaust quieted down considerably. Notice I didn't say it disappeared. But it was hardly noticeable.
I put another 500 miles on the truck, and it's back to popping loudly, again. So I took it to Industrial Injection for them to put the DRB III on there and get some input from them. After shutting off cyl. # 3, the pop sound went away. So, again, another issue with cyl. # 3.
I cracked open the top end only to find that the # 3 exhaust rocker once again had about .060" clearance this time. Now we're worried! We're thinking a valve seat might be dropping (hasn't fallen out, yet...but is getting there).
Another person suggested that maybe the camshaft is getting eaten up on that one lobe. But would it actually eat into the base circle, too? Is it possible the lifter is getting eaten up? Anyone ever experienced this before?
Valvetrain mods include: Max-Spool Pushrods (checked for straight, they're fine), Max-Spool 110# springs, Diesel Pros S1 camshaft.
Any ideas? All input is appreciated! Thanks!
Here's the issue I'm having. After putting the fresh motor in the truck, I set the valve lash to .010 (I), and .020 (E). After about 1800 miles, I started to notice a slight pop noise coming from the exhaust. It ALMOST sounds like a miss, but it's not mis-firing completely.
I suspected some possible valve-train adjustment issues, and upon re-checking the lash settings, I found exhaust rocker arm # 3 to have over .040" clearance. Obviously this is unacceptable, considering I just barely set them to .020 (E).
So, I readjusted it to .020", and the pop noise in the exhaust quieted down considerably. Notice I didn't say it disappeared. But it was hardly noticeable.
I put another 500 miles on the truck, and it's back to popping loudly, again. So I took it to Industrial Injection for them to put the DRB III on there and get some input from them. After shutting off cyl. # 3, the pop sound went away. So, again, another issue with cyl. # 3.
I cracked open the top end only to find that the # 3 exhaust rocker once again had about .060" clearance this time. Now we're worried! We're thinking a valve seat might be dropping (hasn't fallen out, yet...but is getting there).
Another person suggested that maybe the camshaft is getting eaten up on that one lobe. But would it actually eat into the base circle, too? Is it possible the lifter is getting eaten up? Anyone ever experienced this before?
Valvetrain mods include: Max-Spool Pushrods (checked for straight, they're fine), Max-Spool 110# springs, Diesel Pros S1 camshaft.
Any ideas? All input is appreciated! Thanks!