How do you adjust the valves on a 3126 Cat?

When it is #1 at tdc adjust both valves, then the #2, #4 intakes, and then the #3, #5 exhaust. Then turn the engine over 360 degrees and pin it for the other cylinder. Do the #6 valves then #3,#5 intakes, then the #2, #4 exhaust. You can torque the adjuster nuts to 22 +or- 5 lbs if you want to double check your work.

How do you adjust valve clearance on a 4 cylinder?

To do that on a four-cylinder, eight-valve engine, use the rule of nine. Counting from the front of the engine if number eight valve is fully open, subtract eight from nine and the answer is one, so adjust the clearance on valve number one. If number six is closed, then adjust number three and so on.

What happens if valve lash is too loose?

If the valve clearances get too loose, this will lead to a noisy running engine. Consequently, this will eventually damage the camshaft lobes; rocker arms ( if equipped ) and the tips, of the valves themselves.

What happens if the valves are adjusted to tight?

Too much or too little valve clearance can result in poor performance or a rough idle because the engine can’t “breathe” normally and operate at peak efficiency. Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms.

What is valve clearance?

What are valve clearances? Valve clearances on motorcycle and car engines effectively relate to the gap between the top of the valve stem and the cam that operates it. The inlet valves in the engine open to allow air and fuel into the cylinder, while the exhaust valves let the burnt gases out.

What is exhaust valve clearance?

Checking valve clearance requires removing the valve cover (or two valve covers on V-type engines) and measuring the space between both intake and exhaust valves and their lobes or rocker arms using thin feeler gauges as pictured above.