[weezie]

Hello Fellas: I am having a weird valvetrain adjustment issue. Now, being a Ford guy , I have built a few engines in my career. I have however, never used a set of link bar hydraulic roller lifter until now.........the problem is. i am having trouble with noisy ticking that borders on clacking. Its in a 351 W that has aluminum heads.......I have tried the adjustment as per the instructions from Comp Cams. 1/8 turn past zero lash on the valve which is on the seat.......no dice. I went to 1/4 turn , then 1/2 , and I am at 1 1/2 turns in. Still makes noise albeit less noise. I have measure the thread lead for 1 full turn and it is aound .040'' . This means I have the plunger in around .060''-.065''. To me that seams plenty..........when it warms up still clacking. Have I gone too far? Is the Aluminum in the head expanding thatmuch at operating temp to lose all the lash? I know I'll get somewhere with your guys advice. Thanks in Advance.

 

[89lxcoupe]

Hello Fellas: I am having a weird valvetrain adjustment issue. Now, being a Ford guy , I have built a few engines in my career. I have however, never used a set of link bar hydraulic roller lifter until now.........the problem is. i am having trouble with noisy ticking that borders on clacking. Its in a 351 W that has aluminum heads.......I have tried the adjustment as per the instructions from Comp Cams. 1/8 turn past zero lash on the valve which is on the seat.......no dice. I went to 1/4 turn , then 1/2 , and I am at 1 1/2 turns in. Still makes noise albeit less noise. I have measure the thread lead for 1 full turn and it is aound .040'' . This means I have the plunger in around .060''-.065''. To me that seams plenty..........when it warms up still clacking. Have I gone too far? Is the Aluminum in the head expanding thatmuch at operating temp to lose all the lash? I know I'll get somewhere with your guys advice. Thanks in Advance.

you should never go over a full turn or you risk hanging the valves open, i have never had to go over half a turn on any hyd cam ! sounds like your not doing it right. i do the one valve open and one valve closed method and it works great ! how do you check to see if the pushrod to lifter is at zero lash and is there oil coming out the top at the rockers ?

 

[ITSA 91]

Some link-bars will hit the lifter bosses of the Lightning 351 blocks when using a reduced base circle cam.In older 351 blocks the lifter bores may be worn enough to allow the lifter to bleed down.