Problem Adjusting Roller Rockers - L98
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Joined: Jan 2004
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From: Forney Texas
Problem Adjusting Roller Rockers - L98
I am installing Harland Sharp 1.6 RR's in my 90 L98. The cam is stock and I have already installed hardened pushrods and guide plates. The problem I am encountering involves the final adjustment. Here are the steps I am performing.
I aligned the balancer mark at 0 with the #1 piston at TDC of the compression stroke. I then tightened the RR nut just enough to stop the pushrod from turning. I then tightened it another 270 degrees. I then tightened the internal locknut down on the stud. I further tightened the RR nut around 45 degrees to a final torque of 25 ft/lbs. I followed this same procedure for the intake valves for #'s 1, 2, 5, 7 and exhaust valves #'s 1, 3, 4 & 8. All seemed well until I rotated the engine 360 degrees to again align the balancer mark on 0 and noticed several of the previously tightened RR's were loose enough to be moved side to side relatively easily.
I understand these are not self aligning so this may be normal. I am concerned this free play will make for a noisy valve train. Do I have a worry or not and does my tightening procedure make sense?
90Indy :beatdeadhorse:
I aligned the balancer mark at 0 with the #1 piston at TDC of the compression stroke. I then tightened the RR nut just enough to stop the pushrod from turning. I then tightened it another 270 degrees. I then tightened the internal locknut down on the stud. I further tightened the RR nut around 45 degrees to a final torque of 25 ft/lbs. I followed this same procedure for the intake valves for #'s 1, 2, 5, 7 and exhaust valves #'s 1, 3, 4 & 8. All seemed well until I rotated the engine 360 degrees to again align the balancer mark on 0 and noticed several of the previously tightened RR's were loose enough to be moved side to side relatively easily.
I understand these are not self aligning so this may be normal. I am concerned this free play will make for a noisy valve train. Do I have a worry or not and does my tightening procedure make sense?
90Indy :beatdeadhorse:
Team Owner
Joined: Jan 2003
Posts: 20,301
Likes: 240
From: Summerland B.C. Canada
Re: Problem Adjusting Roller Rockers - L98 (90Indy)
Side to side is OK. Back and forth is the clacker :jester .
I adjusted mine a few weeks ago with great results and not needing to adjust while running. I gave mine a 1/2 turn, locked allen and then cranked the big nut 1/8 turn more. I used this method http://www.centuryperformance.com/valveadjustment.asp
as it correctly puts each lifter on the heal of the lobe. Doing the way you did will work, but as you can imagine, all 8 can not be on the heal of the lobe at the same time.
:cheers:
[Modified by AGENT 86, 8:55 PM 4/30/2004]
I adjusted mine a few weeks ago with great results and not needing to adjust while running. I gave mine a 1/2 turn, locked allen and then cranked the big nut 1/8 turn more. I used this method http://www.centuryperformance.com/valveadjustment.asp
as it correctly puts each lifter on the heal of the lobe. Doing the way you did will work, but as you can imagine, all 8 can not be on the heal of the lobe at the same time.
:cheers:
[Modified by AGENT 86, 8:55 PM 4/30/2004]
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Problem Adjusting Roller Rockers - L98 (90Indy)
My method is a little simpler though maybe a little more tedious and relies on the fact that the intake & exhaust valves are both open only while the exhaust valve is closing and the intake is opening:
-select a cylinder
-rotate crank till the exhaust valve is just opening and adjust the intake lash
-rotate crank till the intake valve is just closing and adjust the exhaust lash
This method guarantees that for the valve being adjusted the lifter is on the cam's base circle. More imporantly, you can't get mixed up on which cylinder or valve to adjust.
-select a cylinder
-rotate crank till the exhaust valve is just opening and adjust the intake lash
-rotate crank till the intake valve is just closing and adjust the exhaust lash
This method guarantees that for the valve being adjusted the lifter is on the cam's base circle. More imporantly, you can't get mixed up on which cylinder or valve to adjust.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Problem Adjusting Roller Rockers - L98 (65Z01)
My method is a little simpler though maybe a little more tedious and relies on the fact that the intake & exhaust valves are both open only while the exhaust valve is closing and the intake is opening:
-select a cylinder
-rotate crank till the exhaust valve is just opening and adjust the intake lash
-rotate crank till the intake valve is just closing and adjust the exhaust lash
This method guarantees that for the valve being adjusted the lifter is on the cam's base circle. More imporantly, you can't get mixed up on which cylinder or valve to adjust.
-select a cylinder
-rotate crank till the exhaust valve is just opening and adjust the intake lash
-rotate crank till the intake valve is just closing and adjust the exhaust lash
This method guarantees that for the valve being adjusted the lifter is on the cam's base circle. More imporantly, you can't get mixed up on which cylinder or valve to adjust.
This is the procedure I always use and recommend too.
Jake
