building a motor - Northern California Ford Owners

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Posted by 8850GT (Member # 5909) on :

hey guys im puttin heads on my block that i got and im following the sequence and all that good stuff...but no where in any manual can i find how to bolt down the rockers...theyre the stock 1.6's not rollers....thanks!

Posted by FasterDamnit (Member # 442) on :

EDit: If they are stock and the heads and cam are stock- just bolt them down. Otherwise, follow the instructions.

# Unbolt the stock rockers and remove them from the heads. Clean all the metal guides that go underneath two adjacent rockers as it will be reused (at least w/ the Omegas). Once the old rockers are out it is time to bolt in the new ones.
Rocker Arm!
# Pedestal mount rocker arms have a 5/16" bolt passing down through the pedestal and into the head. The Omegas are assembled two rockers at a time placing the pedestals in the stock guide piece (see photo.) Put a pushrod in place and then lightly assemble rocker arms on the heads.

# Start by setting the the #1 piston at top dead center on the compression stroke. You can confirm this by checking to see if the rotor is pointing directly at the #1 spark plug terminal on the distributor cap. If it is not, rotate the crankshaft until it is. If the distributor is out you can remove the #1 spark plug, and rotate the engine until you feel air rushing out of the #1 spark plug hole, indicating that the #1 piston is coming up on the compression stroke. Then observe the timing marks on the harmonic damper and continue rotating the crankshaft until the 0 degree, or TDC, mark lines up with the pointer. At that point in crankshaft (and camshaft) rotation, both the intake and exhaust valves will be closed and the cam will be on the base circle.

# Working on the #1 piston, slowly spin the pushrod, of the intake rocker, between two fingers while you tighten the 5/16" bolt with your other hand. When it becomes difficult to spin the pushrod, indicating that all clearances have been taken up, torque the 5/16" bolt to 20 ft-lb. If more than one full turn of the bolt is required to achieve the torque setting, you will need to shim the pedestals. Unlike a stud-mount rocker, the only adjustment possible is adding or subtracting shims under the pedestal.
Rocker Arm!
Pedestal shims.

Shimming: Back off the bolt, add a .015” - .020” inch shim under the pedestal, and try it again. Keep adding shims until the torque applied to the bolt reaches 20 ft-lb with between one-half and one full turn of the bolt after the pushrod stops turning. If however the pedestal bolt reaches 20 ft-lb and the pushrod can still be easily rotated, the pushrod is too short and must be replaced with a longer one.

# Repeat the procedure for the exhaust side. Then move the crank counterclockwise so that the rotor is pointing at the next cylinder in the firing order and adjust the rocker arms for that cylinder. Continue through the firing order until all rockers are adjusted.

# With the new rockers bolted down the valve covers and upper intake were reinstalled with fresh gaskets. Now is a good time to check and replace any cracked or old vacuum hoses. It is amazing how many times we hear people blaming a new modification on drive-ability or performance problems, yet the real problem was a vacuum leak.

[ December 22, 2005, 12:39 PM: Message edited by: FasterDamnit ]

Posted by 8850GT (Member # 5909) on :

i have to shim the stock rockers?

Posted by FasterDamnit (Member # 442) on :

quote:
Originally posted by 8850GT:
i have to shim the stock rockers?

EDit: If they are stock and the heads and cam are stock- just bolt them down. Otherwise, follow the instructions.

Posted by 8850GT (Member # 5909) on :

b303 w/ gt40 irons

Posted by FasterDamnit (Member # 442) on :

Otherwise, follow the instructions.

Posted by Luke87GT (Member # 21) on :

LMAO

Posted by 8850GT (Member # 5909) on :

laughin your ass off at what? ive never put a motor together i wana make sure i do it right...?

Posted by SPEC -Fabrication (Member # 4980) on :

quote:
Originally posted by FasterDamnit:
Otherwise, follow the instructions.

Posted by Luke87GT (Member # 21) on :

quote:
Originally posted by 8850GT:
laughin your ass off at what? ive never put a motor together i wana make sure i do it right...?

At you and the way Jim handled your questions. Don't get your panties in a bind [Razz]

Smile, laugh, have a sense of humor (:

Posted by 8850GT (Member # 5909) on :

yeah....thanks for the help

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