Valve Lash Adjustment...
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From: Maryland...DO I HAVE TO ADMIT TO THAT?!
Car: 1991 Chevy Camaro RS
Engine: 283
Transmission: 700r4 Auto
Valve Lash Adjustment...
once all play has been removed from a pushrod, do you tighten the nut an additional one & a half turn or do you stop when all play is removed???
its a 91 camaro with the 3.1 v6 in it.
its a 91 camaro with the 3.1 v6 in it.
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From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: Valve Lash Adjustment...
Jiggle the push rod up and down to make sure there is no play. Then tighten an additional 3/4 of a turn. That worked out well for me on a v8.
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From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
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Joined: Jul 1999
Posts: 17,262
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Valve Lash Adjustment...
1/2 to 3/4 turn is all that's required from zero lash. That puts the proper preload inside the lifter. Don't worry if the pushrod feels loose after adjusting the other pushrods. That's just the way the hydraulic lifter works. Only adjust it from zero lash, not more after it's been adjusted because it "feels loose" again.
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From: Round Lake IL
Car: 1989 formula
Engine: 350 l98
Transmission: 700R-4
Axle/Gears: 327
Re: Valve Lash Adjustment...
do you have rotate the engine for each set of rockers to adjust them or just adjust from were ever they are
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From: Boosted Land
Car: 92 Z28
Engine: Boosted LSX
Re: Valve Lash Adjustment...
Few good posts on these forums about valve adjustment... Here are a few
TDC
I hold the pushrod between two fingers lifting the pushrod up and down while slowly tightening. When you reach the point where there is no up and down movement you will be at ‘0’ lash. Then I go 3/4 turn.
The problem with spinning the pushrod and attempting to get the correct ‘feel’ is that you can and will still be able to spin the pushrod even if you bottom out the lifter. This can cause you to over tighten the adjustment and can lead to bent and / or broken pushrods and valves.
Turn over by hand 360* adjust the loose rockers again.
put valve covers on and done.
I use to have a set of valve covers with the center cut out just enough to adjust the valves. Not as much of a mess as with out one.
and did it this way...
link
http://www.corvette-restoration.com/...Valve_Lash.pdf
TDC
I hold the pushrod between two fingers lifting the pushrod up and down while slowly tightening. When you reach the point where there is no up and down movement you will be at ‘0’ lash. Then I go 3/4 turn.
The problem with spinning the pushrod and attempting to get the correct ‘feel’ is that you can and will still be able to spin the pushrod even if you bottom out the lifter. This can cause you to over tighten the adjustment and can lead to bent and / or broken pushrods and valves.
Turn over by hand 360* adjust the loose rockers again.
put valve covers on and done.
If you want to be quick about it...
bring the number 1 piston at Top Dead Center (TDC) on compression stroke.
Adjust intake valve on #2 and #7;exhaust valves #4 and #8.
Rotate crankshaft 180 degrees clockwise and adjust intake valve on #1 and #8;
exhaust valves #3 and #6.
Rotate crankshaft 180 degrees again (TDC) and adjust intake valves #3 and #4;
exhaust valves #5 and #7.
Rotate crankshaft again 180 degrees and adjust intake valves #5 and #6;
exhaust valves #1 and #2.
bring the number 1 piston at Top Dead Center (TDC) on compression stroke.
Adjust intake valve on #2 and #7;exhaust valves #4 and #8.
Rotate crankshaft 180 degrees clockwise and adjust intake valve on #1 and #8;
exhaust valves #3 and #6.
Rotate crankshaft 180 degrees again (TDC) and adjust intake valves #3 and #4;
exhaust valves #5 and #7.
Rotate crankshaft again 180 degrees and adjust intake valves #5 and #6;
exhaust valves #1 and #2.
I found this method doing a search on this site.
I have used this method on occasion. The first method is more acurate; however this works well also.
Valve Adjustment The Quick Way:
With the engine OFF and spark plugs removed so that you can rotate the engine with less effort.
1. Get #1 piston to compression TDC, Cam gear at 12 o'clock crank gear at 12 o'clock.
2. Adjust the intake valves on cylinders 1, 2, 5, & 7 by loosening the rocker nut until play is in the pushrod then just take the up and down play in the pushrod and tighten the rocker nut 90 degrees
3. Adjust the exhaust valves on 1, 3, 4, & 8 in the same manner.
4. Rotate crank 360 degrees to get cylinder #6 to compression TDC, Cam gear at 6 o'clock and crank gear at 12 o'clock.
5. Adjust the intake valves on 3, 4, 6, & 8 in mentioned manner
6. Adjust the exhaust valves on 2, 5, 6, & 7
I have used this method on occasion. The first method is more acurate; however this works well also.
Valve Adjustment The Quick Way:
With the engine OFF and spark plugs removed so that you can rotate the engine with less effort.
1. Get #1 piston to compression TDC, Cam gear at 12 o'clock crank gear at 12 o'clock.
2. Adjust the intake valves on cylinders 1, 2, 5, & 7 by loosening the rocker nut until play is in the pushrod then just take the up and down play in the pushrod and tighten the rocker nut 90 degrees
3. Adjust the exhaust valves on 1, 3, 4, & 8 in the same manner.
4. Rotate crank 360 degrees to get cylinder #6 to compression TDC, Cam gear at 6 o'clock and crank gear at 12 o'clock.
5. Adjust the intake valves on 3, 4, 6, & 8 in mentioned manner
6. Adjust the exhaust valves on 2, 5, 6, & 7
and did it this way...
This method works very well for a running engine.
Loosen the adjusting nut of one valve until you hear it "clicking". Slowly re-tighten the adjusting nut until the clicking stops. Tighten an additional 1/4 to 1/2 turn. Repeat this procedure for the remaining valves.
Loosen the adjusting nut of one valve until you hear it "clicking". Slowly re-tighten the adjusting nut until the clicking stops. Tighten an additional 1/4 to 1/2 turn. Repeat this procedure for the remaining valves.
http://www.corvette-restoration.com/...Valve_Lash.pdf
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Valve Lash Adjustment...
There are a couple of different ways to adjust the rockers. The rocker being adjusted needs the lifter on the base circle of the cam.
You can bar the engine over until each piston is at TDC on the compression stroke and adjust that cylinders valves or you can adjust all the valves with the timing pointer at TDC to #1 cylinder and TDC for #6 cylinder.
With #1 cylinder is at TDC you can adjust
INT 1,2,5,7
EHX 1,3,4,8
With #6 cylinder at TDC you adjust
INT 3,4,6,8
EXH 2,5,6,7
With the timing pointer lined up to the mark on the balancer, you'll have to determine if #1 or #6 is at TDC. The easiest way is to pull the #1 spark plug and bump the engine over until the compression pushes out. Then just rotate the engine until the timing mark lines up to TDC.
You can bar the engine over until each piston is at TDC on the compression stroke and adjust that cylinders valves or you can adjust all the valves with the timing pointer at TDC to #1 cylinder and TDC for #6 cylinder.
With #1 cylinder is at TDC you can adjust
INT 1,2,5,7
EHX 1,3,4,8
With #6 cylinder at TDC you adjust
INT 3,4,6,8
EXH 2,5,6,7
With the timing pointer lined up to the mark on the balancer, you'll have to determine if #1 or #6 is at TDC. The easiest way is to pull the #1 spark plug and bump the engine over until the compression pushes out. Then just rotate the engine until the timing mark lines up to TDC.
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From: OHIO
Car: 83 CaMarO Z28
Engine: 383 stroker AFR heads 600hp
Transmission: 700r4 stage 3
Axle/Gears: 373 9"
Re: Valve Lash Adjustment...
Ok im confused lol is it 3/4 turn or 1 and 1/2 turns after 0 lash ?????
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Valve Lash Adjustment...
Junior Member
Joined: Sep 2006
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From: OHIO
Car: 83 CaMarO Z28
Engine: 383 stroker AFR heads 600hp
Transmission: 700r4 stage 3
Axle/Gears: 373 9"
Re: Valve Lash Adjustment...
Ok so i put new rods and lifters but cam is original..which one should i do?
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