1.6 Roller Rockers
Thread Starter
Safety Car
Joined: Oct 1999
Posts: 4,679
Likes: 2
From: Honolulu HI
1.6 Roller Rockers
I am getting ready to install these on my 91 L-98. I remember reading somewhere of an easier way to adjust them by turning over the engine twice. Adjust half the rockers at a time instead of turning it over several times. Can any one post the procedure. Thanks for any help.
Aloha,
Larry
Aloha,
Larry
Advanced
Joined: Jan 2001
Posts: 53
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From: Mechanicsville ,Va. 23111 va
Re: 1.6 Roller Rockers (Larry Mackey)
Ok finally got it , server has been down at work.
make sur engine is on #1 firing order, tdc.
-with engine in #1 firing position adjust the following valves:
EXHAUST--1, 3, 4, 8
INTAKE----1, 2, 5, 7
Now crank the engine 1 full revolution until the marks(timing) line up again,
now you can adjust the following valves:
EXHAUST---2, 5, 6, 7
INTAKE-----3, 4, 6, 8
:cheers:
make sur engine is on #1 firing order, tdc.
-with engine in #1 firing position adjust the following valves:
EXHAUST--1, 3, 4, 8
INTAKE----1, 2, 5, 7
Now crank the engine 1 full revolution until the marks(timing) line up again,
now you can adjust the following valves:
EXHAUST---2, 5, 6, 7
INTAKE-----3, 4, 6, 8
:cheers:
Le Mans Master
Joined: Mar 1999
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From: delmont pa
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Re: 1.6 Roller Rockers (Larry Mackey)
make sure you check the push rod clearance thru the head at full lift as the 1.6 rockers moves the push rod closer to the stud. :chevy
Drifting
Joined: Aug 2000
Posts: 1,521
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From: West Islip New York
Re: 1.6 Roller Rockers (Larry Mackey)
Larry
I just tried to use the 2 spin method myself, and if you want some advice, don't use it.
After the third time of trying to adjust my valves (on a brand new engine), this procedure worked the best and is the most accurate.
Starting on any cylinder:
rotate the engine until the exhaust valve begins to open, then adjust the intake valve
rotate the engine until the intake valve (same cylinder) opens and then almost closes, then adjust the exhaust valve
This procedure was given to me by Crane who recommends it over the 2 spin method. I just used it on my gold race rockers and it worked like a charm.
I just tried to use the 2 spin method myself, and if you want some advice, don't use it.
After the third time of trying to adjust my valves (on a brand new engine), this procedure worked the best and is the most accurate.
Starting on any cylinder:
rotate the engine until the exhaust valve begins to open, then adjust the intake valve
rotate the engine until the intake valve (same cylinder) opens and then almost closes, then adjust the exhaust valve
This procedure was given to me by Crane who recommends it over the 2 spin method. I just used it on my gold race rockers and it worked like a charm.
Le Mans Master
Joined: Feb 1999
Posts: 6,172
Likes: 11
From: somers, ny
Re: 1.6 Roller Rockers (Larry Mackey)
another method i sometimes use is to cut the top off an old distributor cap. number the cyls on the cap. put the cut cap on and adjust the cyl that the rotor is pointing to.
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Burning Brakes
Joined: Dec 2000
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From: Des Moines Iowa
Re: 1.6 Roller Rockers (Larry Mackey)
Larry, I agree that you should not use the 'two rotation' spin method of valve adjustment if you have anything other than a stock camshaft. Believe the added lift/duration of aftermarket camshaft can make this method and inaccurate method of adjustment resulting in possibly setting some valves too loosely. My experience has been that I've also been more successful with the push rod 'jiggle' rather than spin method, which I found to sometimes result in a valve setting which is too tight. It's easier for me to adjust till there is no more up/down push rod 'jiggle', and then go 1/2 to 3/4 turn tighter.
Thread Starter
Safety Car
Joined: Oct 1999
Posts: 4,679
Likes: 2
From: Honolulu HI
Re: 1.6 Roller Rockers (john's '81 mouse)
Thanks to everyone for the info. I am going on vacation for a couple of weeks and when I get back I will be doing the installation.
Aloha,
Larry
Aloha,
Larry
Race Director
Joined: Nov 2000
Posts: 11,872
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From: Waterloo ontario Canada
Re: 1.6 Roller Rockers (Larry Mackey)
I would be suprised if you could set all the valves with a 2 spin method. I use almost the same method Starting with #1 on the firing TDC. But then I move it to BDC, then TDC and fianally BDC. My method works with any cam and is quicker then bumping the motor over.
Norval
Norval
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: 1.6 Roller Rockers (Larry Mackey)
Thanks to everyone for the info. I am going on vacation for a couple of weeks and when I get back I will be doing the installation.
Aloha,
Larry
Aloha,
Larry
Team Owner
Joined: Nov 1999
Posts: 32,782
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Re: 1.6 Roller Rockers (Mr. G.)
Newark :lol:
Thread Starter
Safety Car
Joined: Oct 1999
Posts: 4,679
Likes: 2
From: Honolulu HI
Re: 1.6 Roller Rockers (Larry Mackey)
O K guys, I just got back from vacation and read the posts. I went to Chicago for a reunion with my Viet Nam Veteran friends. 33 years since I saw them. Didn't even know some of them were alive! A very good and bad time. We were infantry during the year of Tet Offensive. We tried to talk about what has happened since 1968 not before or during 1968. Thaks to everyone for asking, now you know. 
Aloha,
Larry
Aloha,
Larry