Question about 1994 Chevrolet C1500

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Valve noise Hello. I have a 1994 Chevy Blazer 5.7L v-8. Had lots of valve noise but ran good. Took the valve covers off to check the rockers and they were all loose so I decided to adjust all the rockers according to an online manual I got at The instructions said to back off the rocker stud nut until the pushrod turned freely. Then tighten the nut until zero lash (the pushrod did not spin). Then tighten one full turn. I did not do anything else. Even though this did not sound right I followed the directions. Only removed the distributor cap to tell when it was pointing at number 1 or number 6. Manual told me which valves to tighten at each spot. (ar no. 1 intake 1,2,5,7 exhaust 1,3,4,8 and at no. 6 intake 3,4,6,8 exhaust 2,5,6,7. When I reassembled the engine it would not run. It sounded like a lawn mower...Like the timing was way off. After being puzzled and thinking about it for awhile, I think that the rockers are too tight and the valves are never closed. Since I didn't touch anything relating to the firing order or the timing, I can't understand why it won't run right other than the above explanation. Is the adjustment directions right? If not can you tell me how to adjust the rockers correctly? Any help would be appreciated and save me alot of aggravation and money. Thanks for the help.

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  • Anonymous Mar 15, 2014

    it sounds like rockers ticking but the sound is in the exhaust I have the valve cover off and they look fine.



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I am from the old school. Start the engine with the valve covers off, back off the rocker nut until the rocker starts tapping then slowly tighten nut until tapping stops then go an 1/8 of a turn tighter. Repeat the same for the rest.I know it will be very messy and you have to watch the oil on the exhaust manifolds for a fire. There will be a lot of smoke. What I do is cut out sheet metal and use it as a shield so the oil does not flow over the head as much.

Posted on Dec 27, 2008

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Hi mate the way you adjusted them is ok but one full turn down is way too much i think u may have bent some valves the is no way the lifters would bleed back after being adjusted that much

what i would do is readjust tappets but only to zero lash
put covers back on and start engine see if it runs better
if it fine then remove coves turn all adjusters another 1/4 of a turn and let the car sit for 20 minutes to let lifters bleed back

if the car runs **** do a compression test and check reading

hyd camshafts most time dont need adjustments lifters and camshafts wear which give u noise

if u do need to take the heads off check your camshaft and lifters for wear a good enginge shop will check them at no charge

if u do need to replace the camshaft and lifters dont use a std camshaft put in tow cam it will improve econemy and power

Posted on Dec 27, 2008


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