1.7 Cobra Rockers, should i use shims?

[Kdubslugga]

Am i supposed to use shims or is it ok not to, i got some Ford Racing Pushrods, just stock replacements

 

[352Ford2]

only use shims if you need them. It is ver important to go through the check procedure after installing rocker arms, I listed the link below.

http://static.summitracing.com/global/images/instructions/fms-m-6564-a351.pdf

bottom of page 2

 

[Kdubslugga]

Thanks for that link, came in handy. I checked on a few of the rockers to see how much the fulcrum bolt turns and its about 3/4 a turn before it reachs 18-20 ft lbs of torque. However i do a a small question, on cylinders 4 5 6 and 8 a few of the rockers just keep on tightening compressing the valve springs, im assuming this has something to to with the firing order or something, now when i rotate the engine and tighten everything down under Top Dead Center this wont happen right? No Rockers should be compressing the springs right?

 

[Stormwalker]

Thanks for that link, came in handy. I checked on a few of the rockers to see how much the fulcrum bolt turns and its about 3/4 a turn before it reachs 18-20 ft lbs of torque. However i do a a small question, on cylinders 4 5 6 and 8 a few of the rockers just keep on tightening compressing the valve springs, im assuming this has something to to with the firing order or something, now when i rotate the engine and tighten everything down under Top Dead Center this wont happen right? No Rockers should be compressing the springs right?

I believe you should have the cylinder at tdc on the compression stroke for the rockers you are doing. That way, the lifters are "all the way down". That's the condition it should be to tighten it to 18-20 ft lbs. Easiest to do it in the same order as the firing order I believe.
You can also check your pushrods by hand for play and such, assuming you have your lower intake off.

 

[8950HO]

Thanks for that link, came in handy. I checked on a few of the rockers to see how much the fulcrum bolt turns and its about 3/4 a turn before it reachs 18-20 ft lbs of torque. However i do a a small question, on cylinders 4 5 6 and 8 a few of the rockers just keep on tightening compressing the valve springs, im assuming this has something to to with the firing order or something, now when i rotate the engine and tighten everything down under Top Dead Center this wont happen right? No Rockers should be compressing the springs right?

Make sure the valves that the rockers are compressing the springs on are closed.I just work on one cylinder at a time.

You may have some defective lifters.I ran into this problem myself when I installed those rockers.
One lifter would not bleed down at all,(with valve closed).Tightening the rocker would open the valve.I replaced this lifter and it was fine.

But first make sure the lifter is on the base circle of the cam lobe and the valve is fully closed first.

The rocker should not open the valve if the valve is fully closed and the lifter is off the cam lobe.

 

[Kdubslugga]

So it would be normal for the rocker to compress the valve spring if i tighened it while the lifters were not seated at the bottom? I can clearly see the pushrods are sitting a bit higher on the rockers that are compressing the valve springs, so if i rotate the crank and tighten everything down in order the rockers should absolutley not compress any valve springs right?

 

[352Ford2]

So it would be normal for the rocker to compress the valve spring if i tighened it while the lifters were not seated at the bottom? I can clearly see the pushrods are sitting a bit higher on the rockers that are compressing the valve springs, so if i rotate the crank and tighten everything down in order the rockers should absolutley not compress any valve springs right?

You need to be at TDC of the comp stroke of the cylner you are working on, that should fix these issues

 

[matm347]

Yes, what you are seeing is normal, just do as stated above and rotate the crank until the lifter is on the base circle. Use shims only as needed. They come in two different sizes...two thin ones are usually equal to one thicker.

 

[Zero_chance]

Thats a pretty handy link for anyone doing rockers.

 

[Kdubslugga]

Awesome guys, thanks a million!!