Rocker Arm Question (1 Viewer)

[OKMike]

My first rodeo with the 2F. PO disassembled the rocker arm assembly and put all the parts in a box. I have all 12 rocker arms, the shaft they go on, the springs, etc. Problem: FSM and Haynes say the rocker arms are different (Haynes labels them I and EX which I presume means intake and exhaust--FSM just says "there are two types of rocker arms").

Is there a difference and how do I tell which one is which? Haynes has a diagram with the order they go on (it shows either I or EX) so if I can differentiate one from the other I should be good to go. Looked at them all but nothing jumps out. I'm sure it's something simple. Many thanks. Genuinely appreciate the help.

UPDATE: So apparently the difference in the two types of rocker arm is they "slant" 2 different ways going away from the rocker. Also found this video the machine shop guy confirms this. Some point "out" some point "in." This squares with the pic for 2F engines in the Haynes manual at p. 25.

 

[DougAustinTx]

My first rodeo with the 2F. PO disassembled the rocker arm assembly and put all the parts in a box. I have all 12 rocker arms, the shaft they go on, the springs, etc. Problem: FSM and Haynes say the rocker arms are different (Haynes labels them I and EX which I presume means intake and exhaust--FSM just says "there are two types of rocker arms").

Is there a difference and how do I tell which one is which? Haynes has a diagram with the order they go on (it shows either I or EX) so if I can differentiate one from the other I should be good to go. Looked at them all but nothing jumps out. I'm sure it's something simple. Many thanks. Genuinely appreciate the help.

I'm sure you'll figure out which rocker goes where, BUT, be sure you have the oiling hole in the rocker shaft oriented so it's on the shaft stand that has the oiling hole in it. The shaft can be assembled backwards, so the hole is on the wrong shaft stand, you'll get NO oil to the rockers and valves. The rocker stand that oils is the only one that has three holes rather than two. Make sure the holes line up. I think it's the third stand from the firewall. Good luck.
Doug

 

[OKMike]

Thanks. Great catch. I found the shaft stand with the oil hole. Still trying to figure out what makes one rocker arm different from another. I keep looking at them like a dog watching TV.

 

[Dizzy]

There is an angle that they need to be set at relative to the shaft, based on where the valve is located. The big mistake that I found with these is not aligning the groove for the head bolts, I have one that is all dented from someone forcing it on with the bolts not aligning with the shaft. What year 2F? My '75s are way different from my '82s.

Also, there may be some wear on the bottom of the shaft. I really considered removing the protruding material from the oiler groove, at this location, because if the rocker arm bushing has to contend with it, it will make a click as it cycles. However, I chickened out, and adjusted the valve lash tight by .003, the click can't be heard, and the engine's vacuum improved also.

Cylinder one to the front, two to the back, three to the front, four to the back, five to the front, six to the back, relative to the cast pillars. The bigger bolt holes on the manifold sides, which also align the rocker arm groove - keeping the oiler hole in place.

 

[OKMike]

There is an angle that they need to be set at relative to the shaft, based on where the valve is located. The big mistake that I found with these is not aligning the groove for the head bolts, I have one that is all dented from someone forcing it on with the bolts not aligning with the shaft. What year 2F? My '75s are way different from my '82s.

Also, there may be some wear on the bottom of the shaft. I really considered removing the protruding material from the oiler groove, at this location, because if the rocker arm bushing has to contend with it, it will make a click as it cycles. However, I chickened out, and adjusted the valve lash tight by .003, the click can't be heard, and the engine's vacuum improved also.

Cylinder one to the front, two to the back, three to the front, four to the back, five to the front, six to the back, relative to the cast pillars. The bigger bolt holes on the manifold sides, which also align the rocker arm groove - keeping the oiler hole in place.

View attachment 2287489View attachment 2287490

Thanks so much, Dizzy. Great info and the pics are a huge help. DougAustinTx told me about the oil hole (Thanks God cause I never would have thought about that) then while Google searching this question this morning I found an ad on Ebay where a guy was selling a used F2 arm and he said: "they slant 2 different ways going away from the rocker." I went and found mine and lined them up against each other and it all made sense. I knew it had to be something simple. I was going nuts looking at the pic in the Haynes and the FSM had me spooked too since it specificially said NOTE--there are two types of rocker arms. Apprecaite the help, Brother!