anything to do after valve adjustment?

[Uncle Gump]

that posted... 4.5 turns seems a bit much honestly.

The 1 1/2 turns was what I always did on a small block chevy. With engine running back off adjuster until you hear the rocker clatter. Tighten until you hear clatter stop... then continue to turn 1 1/2 turns to set the preload. That was with a new cam/lifters. Used cam and lifters was only 1 turn.

 

[stamina]

that posted... 4.5 turns seems a bit much honestly.

The 1 1/2 turns was what I always did on a small block chevy. With engine running back off adjuster until you hear the rocker clatter. Tighten until you hear clatter stop... then continue to turn 1 1/2 turns to set the preload. That was with a new cam/lifters. Used cam and lifters was only 1 turn.

ok, well i did a full adjustment (the right way this time) and did 1 1/2 and she won’t start, just like a while ago when i did an adjustment, i backed off 3/4 when i did it in the past and she started right up just like she did before so i think 3/4 is fine, but this was with original lifters pushrods cam and rockers, i felt like something may be different this time when i did it with new parts, any idea why it doesn’t start with 1.5 turns of preload?

 

[Uncle Gump]

ok, well i did a full adjustment (the right way this time) and did 1 1/2 and she won’t start, just like a while ago when i did an adjustment, i backed off 3/4 when i did it in the past and she started right up just like she did before so i think 3/4 is fine, but this was with original lifters pushrods cam and rockers, i felt like something may be different this time when i did it with new parts, any idea why it doesn’t start with 1.5 turns of preload?

It only makes sense that it would be holding valves open. Probably should have cranked really fast too... if it really didn't have compression.

If you looked at the table I posted... Ford really wanted you to compress the lifter by 2mm or 0.070 inch. It would have been easy to measure adjuster turns on one valve to determine that amount of compression. Then you could have just adjusted the rest based off of your findings after you were at zero lash.

I really think the 4.5 turns the procedure stated was off... perhaps a typo? I'm not sure of the thread pitch but over 4 turns seems way more then 0.070 inch.

 

[AndyB.]

I think the 4.5 likely is a typo.

 

[Uncle Gump]

I think the 4.5 likely is a typo.

I have to agree...

I was thinking maybe they were going for 4/5 of a turn. That would be close to the 3/4 turn the OP says works... and it appears to be pretty close based on your photo of the T-scale.

 

[AndyB.]

Eyeballing it, I think the threads are slightly greater than 1mm apart, I think 1.5 turns would yield the 2mm desired dimension.

 

[alwaysFlOoReD]

This is directly from my factory service manual for 1986...

View attachment 73570

I found this pic on the webs, and 4 other sites specify 1.5 turns.