HELP! Inline 6 valve adjustments - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slow69 · 07-16-2002, 12:50 PM

Question for you sixers out there. I drove my truck today (haven't driven in like a year) and I had a noisy rocker arm so I took it back home, and pulled the valve cover. I noticed i had a bent pushrod, so I replaced it (actually both intake and exhaust). I snugged the rocker up so that the rod had some drag when I spun it.
I then started the truck and went about adjusting them all. I used the method of loosening each one until it clicked, snugged it until it stopped and then went another 1/2 turn. I did this too all of them and it didn't sound great and there was still a little tapping. It was coming from the first rocker arm (closest to the fan). It turns out the stud was bent, so I unbent it and put the valve back on. I adjusted that one and it was much quietter.

Ok, now heres the weird thing. The truck doesn't sound good at all. Before I drove it, I would start it up about twice a month and let it idle for a while and it sounded silky smooth. Now, it sounds like crap. I checked the timing, it was fine. So what is going on?

Brad · 07-16-2002, 01:28 PM

Try checking the carb and adjusting that. I like to use a vacuum gauge to get the mixture correct. Maybe dirt got in it and it needs a rebuild. Try changing fuel filters first. Oh, also, are you using the gas from a year ago? If so, that would cause a bad idle and make it run rough, if you actually got it running.

slow69 · 07-16-2002, 01:34 PM

Thanks Brad,
I actually put new gas in it when I drove it. I may adjust them the same way again, and drive it around to see if it does have some old gas residue left. I will check the carb too. Thanks alot. I was mostly concerned with the valves, I'm glad I did them correctly.

1967LWBstepside · 07-16-2002, 03:30 PM

Did you check your splark plugs or distributor cap & rotor? How about the points? Maybe the dwell needs adjusting. The vacuum line thoughts posted above are right on track.

Just some ideas to rule out in troubleshooting . . .

Mike

07-16-2002, 12:50 PM	#1
slow69 Registered User Join Date: Dec 2000 Location: Flagstaff, AZ Posts: 140	HELP! Inline 6 valve adjustments Question for you sixers out there. I drove my truck today (haven't driven in like a year) and I had a noisy rocker arm so I took it back home, and pulled the valve cover. I noticed i had a bent pushrod, so I replaced it (actually both intake and exhaust). I snugged the rocker up so that the rod had some drag when I spun it. I then started the truck and went about adjusting them all. I used the method of loosening each one until it clicked, snugged it until it stopped and then went another 1/2 turn. I did this too all of them and it didn't sound great and there was still a little tapping. It was coming from the first rocker arm (closest to the fan). It turns out the stud was bent, so I unbent it and put the valve back on. I adjusted that one and it was much quietter. Ok, now heres the weird thing. The truck doesn't sound good at all. Before I drove it, I would start it up about twice a month and let it idle for a while and it sounded silky smooth. Now, it sounds like crap. I checked the timing, it was fine. So what is going on?

07-16-2002, 01:28 PM	#2
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	Try checking the carb and adjusting that. I like to use a vacuum gauge to get the mixture correct. Maybe dirt got in it and it needs a rebuild. Try changing fuel filters first. Oh, also, are you using the gas from a year ago? If so, that would cause a bad idle and make it run rough, if you actually got it running. __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

07-16-2002, 03:30 PM	#4
1967LWBstepside 'Heavy Metal' Redefined. Join Date: Mar 2001 Location: Starkville, MS, USA Posts: 107	Did you check your splark plugs or distributor cap & rotor? How about the points? Maybe the dwell needs adjusting. The vacuum line thoughts posted above are right on track. Just some ideas to rule out in troubleshooting . . . Mike __________________ 1967 C10 LWB stepside, 250 engine, GM HEI, aftermarket A/C., Clifford Performance intake, Stovebolt split headers, Carter AFB 500, X-pipe & Dynomax Super Turbos, 1 piece custom driveshaft, cyprus bed wood & stainless bed strips. Starkville, Mississippi \| My Truck Page

07-16-2002, 01:34 PM	#3
slow69 Registered User Join Date: Dec 2000 Location: Flagstaff, AZ Posts: 140	Thanks Brad, I actually put new gas in it when I drove it. I may adjust them the same way again, and drive it around to see if it does have some old gas residue left. I will check the carb too. Thanks alot. I was mostly concerned with the valves, I'm glad I did them correctly.



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