piston to valve clearance should be checked then pushrod length should be checked. usually the minimum clearance will be longer on the exhaust side and shorter on the intake.
you dont have to do all that if its just out of adjustment! Just tighten the open valve first, until you can rotate the pushrod in your finger.. should be tight, but loose enough to rotate. Then you turn the motor over to the next cylinder.. one by one until they are all the same tension. Then lock down your hex (if its roller rockers you have) and it should be close.. just some folling you have to do to get it right.
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1988 GT,306 roller,F303,Mass air Converted,new T-5 w/K cobra,Trick Flow Street intake,Edelbrock Performer heads,24 # injectors w/ Pro-M mass air,1.6 Crane R Rockers, Pypes Exhaust, 75 MM everything w/ CAI, Pulleys,3:73,much more,almost fully restored
when he asked about valves thats why i said to do the forementioned, the way you explained i agree is rocker to pushrod adjustment but not valve itself. i agree though, top dead center and adjust to where pushrod spins with slight but not serious bind. if he doesnt understand top dead center he can pull a plug on the first in firing order and be able to tell when its top dead center am i not right.
oh ok I see.. I just thought the car was running already and started acting up.. if that is the case then he dosent need to check the clearance..I wasnt sure what the situation was exactly.
Yeah that sounds right to me what u said Ice or you can just eyeball it if the intake is off.. and the only real way to adjust the actual valve is new springs.
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1988 GT,306 roller,F303,Mass air Converted,new T-5 w/K cobra,Trick Flow Street intake,Edelbrock Performer heads,24 # injectors w/ Pro-M mass air,1.6 Crane R Rockers, Pypes Exhaust, 75 MM everything w/ CAI, Pulleys,3:73,much more,almost fully restored
thats correct and if hes having trouble finding top dead center, he can pull the belt and the plug on the first in firing order, stick a screwdriver in the hole and rotate the crank by hand until he feels it on the screwdriver tip and then mark the distributor for future refrence.
Posts: 272
Joined: 12/27/2005 From: Seattle area Status: offline
Why would a car with hydraulic lifters suddenly need adjustment? Do you have aftermarket roller rockers? The rocker arm lash is adjustable, but you can't "adjust the valves" on a 5.0 like you can with a solid lifter engine or an overhead cam one. If nothing's been touched, you're barking up the wrong tree. What's the problem you're trying to fix?
< Message edited by wythors -- 12/29/2006 9:12:39 AM >
I rebuilt my motor and got some new roller rockers that are adjustable. someone in another thread said that i tightened one to far because i said it was backfiring through the carb.. I was wondering the correct way to adjust these.
I was reading the page that aode06 posted up and it says to get them to zero lash.. ( tight enough but still able to turn with your fingers) then go 1/2 to 1 full turn then lock it down... do i leave it at zero lash like Edge_ of_Sanity was describing or do i tighten it more?
do you have stud mount rockers or pedestal mount. if its stud its just until they wont spin then back off just until they will barely spin,tighten half a turn, the pushrods that is then tighten the polly locks. for pedestal mount its zero lash then its whatever ft lbs of torque your manufacturer calls for and this usually must be reached in more than 1/2 turn and less than 1-1/4 turns. less than a 1/2 =rocker needs to be shimmed, more than 1-1/4 turns = longer push rods.
< Message edited by iceman89gt -- 12/29/2006 7:10:24 PM >
Posts: 272
Joined: 3/18/2006 From: Albuqerque, New Mexico Status: offline
i seen some oldschoolers do it with the engine runing. they losen the nuy till you here the rokcer clattering then start tightning the nut till the rocker stops clattering then go a 1/4 more then lock the nut.
< Message edited by Gtdaniel -- 12/29/2006 8:21:03 PM >
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1991 Gt built AOD X-pipe 2.5 MAC system BBK equal length shorties 4.10 31 spline axles
never seen it, but i guess anything is possible, i know everyone says they have never heard of putting transmission fluid in your oil if you have a lifter thats not priming but ive seen it work first hand.
Posts: 272
Joined: 3/18/2006 From: Albuqerque, New Mexico Status: offline
quote:
ORIGINAL: iceman89gt
never seen it, but i guess anything is possible, i know everyone says they have never heard of putting transmission fluid in your oil if you have a lifter thats not priming but ive seen it work first hand.
never heard of that, I'll give it a try.
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1991 Gt built AOD X-pipe 2.5 MAC system BBK equal length shorties 4.10 31 spline axles
i had a lifter not priming and a guy at the track said check your oil and i said its a quart low. he said put a quart of transmission fluid in it and 15 min. later that puppy was tip top again.
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!!I Need How To For Valve Rocker/Valve Adjustment!! - 
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