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How to Install Yella Terra Rockers

There are very few reasons to install aftermarket rocker arms. Either the factory rocker arms have failed or they allow too much flex when using stiffer valve springs. Too much flex will cause performance issues, tappet noise or both. Yella Terra rockers are built stronger than the ones that come from the factory; hence, they slightly increase horsepower on high-performance engines. While there is a specific procedure for installing Yella Terra rockers, after the valve covers and fuel rails are removed, installing Yella Terra rockers should not be too difficult for someone with automotive repair experience.

Instructions

1

Turn the engines crankshaft pulley bolt clockwise using a half-inch drive socket with the appropriate size socket wrench installed.

2

Pick any cylinder and observe the valve stems and rocker arms while turning the engine. The exhaust valve will compress and release first, then the intake valve will compress and release. Stop turning the engine at this point. The cylinder is on its compression stroke and both valves are closed. Do not turn the engine anymore.

3

Remove all the bolts holding all the rocker arms to the cylinder head with the appropriate sized socket wrench attached to a 3-inch long 3/8-inch drive extension on a 3/8-inch drive ratchet wrench.

4

Slide two of the bolts that held down the old rockers through the top of a pair of Yella Terra rockers. Slip a Yella Terra pedestal onto each bolt from the bottom of the rocker arm. Ensure that the wide flat part of the pedestal will contact the cylinder head after installing the Yella Terra rocker assembly.

5

While holding the thumbs on the top of the rocker bolts and holding the pedestals on the bolts with the first finger of each hand, slide the bolts into the cylinder head over the cylinder that has the closed valves. Thread to the bolts back into the cylinder head by turning them clockwise. Ensure that the concave portion of the rocker sits on top of the push rod while the flat portion of the rocker sits on top of the valve stem.

6

Take the ratchet off the 3/8-inch extension. Run the bolts down as far as possible by sliding the socket wrench onto the bolts and turning them using the extension until the bolts are finger tight. At this point, there should be no gap between the push rod and the rocker or the valve stem and the rocker. Install the extension back onto the ratchet.

7

Slip the socket over one of the bolts so that the ratchets handle points to the 12 oclock position.

8

Tighten the bolt by turning the ratchet clockwise 90 degrees until the ratchet handle points to the three oclock position. Repeat for the second bolt. Alternate this procedure between the first and second bolts, counting the number of 90-degree turns it takes to them. If more than four turns are required, remove the bolts and install one of the shims included with the new Yella Terra rocker arms onto each bolt, between the pedestal and the cylinder head. If the push rods and the valve stems are the correct length, installing the shims should result in only having to make between one and two 90-degree turns of the ratchet to tighten the bolts.

9

Install the rest of the Yella Terra rockers. If the first set of rockers required shims, use shims on all the rocker sets. If no shims were necessary, do not use shims at any of the other rocker sets.

10

Slide the correct size 1/2-inch drive socket onto a 1/2-inch drive torque wrench. Torque the bolts holding the rockers to the head, according to the engine manufacturers specifications.

Posted by Unknown at 2:00 AM

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Labels: how, install, rockers, terra, to, yella