I got the valve cover off already, one or some rockers make a knocking noise, and i know they are not adjusted right. How exactly shoudl it be done? Tight loose..should i be able to move the rockers a little bit or should it all be tight.
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11:14 PM
PFF
System Bot
Jul 19th, 2002
Synthesis Member
Posts: 12207 From: Jordan, MN Registered: Feb 2002
Originally posted by raph130: I got the valve cover off already, one or some rockers make a knocking noise, and i know they are not adjusted right. How exactly shoudl it be done? Tight loose..should i be able to move the rockers a little bit or should it all be tight.
Loosen the nuts on the rocker arms until the arms are loose. Then, going by the specs in the Haynes manual, use one hand to spin the push rod in place, and slowly tighten the nut down until the push rod can't spin anymore. JUST until it stops turning... Then, tighten it by 3/4 of a turn...
Be careful to follow which cylinder you are working on, because Both valves MUST be closed, and the lifters must be resting on the smooth side of the cam, rather than the lift, or the drop on the other side of the lobe.
Depends on what engine you have some are adjustable some you torq down. get you a repair manual on the car and do what it says it will tell you to rotat the engine to a # on the timing marker and you will adjust or torq the # of valves it tells you and then you will rotat again and do the same on the others
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03:14 AM
Phaeton Member
Posts: 1437 From: Interior Alaska Registered: Dec 1999
You said 'rocker cover' singular so it must be a four. Whew.
Take out the spark plugs and put your finger in the hole while you crank the engine. When the finger gets blown out of the hole stop and adjust the rocker per previous intructions. Do this for all the cylinders.
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03:48 AM
Rodrv6 Member
Posts: 1909 From: Ball Ground, Ga. Registered: Nov 1999
If it is a 4 cylinder, then there is NO adjustment on the rockers. The rocker nut is torqued down against a shoulder on the rocker stud. If there is still noise, then you either have worn out lifters or pushrods. The V6 is the only Fiero engine that uses the 3/4 turn method mentioned above. This is per the factory book and experience.
------------------ Rod Schneider, Woodstock, Ga. White 88 GT :)
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05:56 AM
GTDude Member
Posts: 9056 From: Keysville, Virginia, USA Registered: Nov 2001
Originally posted by Rodrv6: If it is a 4 cylinder, then there is NO adjustment on the rockers. The rocker nut is torqued down against a shoulder on the rocker stud. If there is still noise, then you either have worn out lifters or pushrods. The V6 is the only Fiero engine that uses the 3/4 turn method mentioned above. This is per the factory book and experience.
I agree.......or you could have a bad camshaft or even a bad rocker arm.
Phil
------------------ GTDude OVER 25 years GM experience
The lifters should be spinning, I suppose the pushrods will be turning some also. The 350 uses the take out all slack and tighten 3/4 turn method just like the 2.8 does.
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12:18 AM
GTDude Member
Posts: 9056 From: Keysville, Virginia, USA Registered: Nov 2001
Go to a parts store and get a set of rocker clips. They keep the oil from splattering with the engine running.
With the engine running......turn the rocker until it just starts to make noise then turn it 1/2 to 3/4 of a turn. It may miss for a second or two until the lifter adjusts to it. Do this to each rocker. If you have any that won't adjust or the noise comes back.....you have a bad lifter and/or camshaft.
Phil
------------------ GTDude OVER 25 years GM experience
