Roller rockers installed valves adjusted....
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Roller rockers installed valves adjusted....
Otherwise stock LT1 in a '95 coupe.
Used the 3/4 turn past slack removed method on cold dead motor. Started it up and thought I could hear a lifter ticking. No oil splashing so I thought I'd leave it running and back off and retighten each one till I found the loose one. As expected they would all start ticking when I backed them off about 3/4 turn.
Now the part that I don't understand. I could only retighten about a quarter turn. Much more than that and the engine would run rough. I'm assuming that the valve was being held open by too tight of a setting. Setting the valves with the engine running took a setting that was a full half turn looser. If I adjusted back to the original cold setting, the engine probably woudn't run. What's up with that?
Used the 3/4 turn past slack removed method on cold dead motor. Started it up and thought I could hear a lifter ticking. No oil splashing so I thought I'd leave it running and back off and retighten each one till I found the loose one. As expected they would all start ticking when I backed them off about 3/4 turn.
Now the part that I don't understand. I could only retighten about a quarter turn. Much more than that and the engine would run rough. I'm assuming that the valve was being held open by too tight of a setting. Setting the valves with the engine running took a setting that was a full half turn looser. If I adjusted back to the original cold setting, the engine probably woudn't run. What's up with that?
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
When you set the rockers originally you tightened them too far and depressed the plunger inside the lifter, either because there was no oil in the lifter or you pressed it all out. Once you started the engine and the lifters pumped back it began to hold the valve open instead.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Originally Posted by old motorhead
Otherwise stock LT1 in a '95 coupe.
Used the 3/4 turn past slack removed method on cold dead motor. Started it up and thought I could hear a lifter ticking. No oil splashing so I thought I'd leave it running and back off and retighten each one till I found the loose one. As expected they would all start ticking when I backed them off about 3/4 turn.
Now the part that I don't understand. I could only retighten about a quarter turn. Much more than that and the engine would run rough. I'm assuming that the valve was being held open by too tight of a setting. Setting the valves with the engine running took a setting that was a full half turn looser. If I adjusted back to the original cold setting, the engine probably woudn't run. What's up with that?
Used the 3/4 turn past slack removed method on cold dead motor. Started it up and thought I could hear a lifter ticking. No oil splashing so I thought I'd leave it running and back off and retighten each one till I found the loose one. As expected they would all start ticking when I backed them off about 3/4 turn.
Now the part that I don't understand. I could only retighten about a quarter turn. Much more than that and the engine would run rough. I'm assuming that the valve was being held open by too tight of a setting. Setting the valves with the engine running took a setting that was a full half turn looser. If I adjusted back to the original cold setting, the engine probably woudn't run. What's up with that?
Jake
