I just replaced head gaskets, lifters, rocker arms, and pushrods on my 331 stroker SBF and I had a tick coming from the motor. So in an attempt to adjust the rockers/valves I am now chasing compression(I can't seem to line the cylinders up within 15% difference of each other). Most are around 130-140psi on a cold test but I have #1 at 70 and #5 at 185, I can't raise #1 or lower #5 for some reason. I need help getting this car to run properly and it's driving me crazy!! I need good compression with zero to minimal valvetrain noise….please help!! Can you get this valvetrain sor
Hello. I would need to know more about the engine like what types of parts are being used. It simply sounds like the lifters were not bled off prior to setting the lash. If this was not done then that needs to be done prior to doing anything else. If it has been done then you may have some faulty lifters.
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To adjust hydraulic lifters two fingers spin the pushrod as the lock nut is gently tightened. When resistance is felt on the pushrod, that`s zero lash. The adjuster is tightened to specs then the setscrew locks it in place. When changing valvetrain components always check rocker arm geometry.
Valve clearances are checked and adjusted when the crankshaft/piston of the cylinder you are adjusting are at top dead center on the compression stroke.
The effect of setting the valve lash too tight can result in the valve not fully closing on the seat. This will allow cylinder pressure to escape along with high-temperature combustion gases. It is possible then for the temperature of the valve head and valve seat to become so high that rapid burning can occur.
How Can You Quiet Your Car Engine? Once you verify the lifter ticking is not caused by a worn-out lifter or some other damaged part, the best thing to do is change the oil. Get rid of all the oil currently in the engine and flush it out before adding new oil.
Engine position for adjustment: To adjust the intake lifter/rocker, rotate the engine and watch for the exhaust lifter to be on the low portion of the cam (valve closed) and continue rotating the engine until the exhaust lifter just starts to rise (valve just starting to open), stop and adjust the intake.
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.
To set the lifter preload, turn the engine in its normal direction of rotation until the exhaust lifter just starts to travel upwards. 2. Adjust the intake valve to zero lash and then turn the rocker arm adjustment nut 1/4 to 1 turn. This additional turning of the adjustment nut sets the lifter preload.
To adjust valve lash, loosen the locknut (10mm), and turn the tappet adjusting screw until the drag on the feeler gauge is correct. Then while holding the tappet adjusting screw with the screw driver, tighten the locknut, then recheck the clearance. Repeat the adjustment, if necessary. Reassemble and reseal.
If you notice that your engine is losing power when you start it or if you hear loud tapping or clicking sound when you start it, your valves may be out of adjustment. A rough idling time, especially before the car warms up, is another sign that your valves are out of adjustment.
Exhaust valves and air intake valves at the top of the cylinder can also get overheated, and leak gas or the valve seals can become too worn to seal the gas in properly. Either way, the result is often low compression. Several valve problems can lead to low compression.
Regurgitation (or insufficiency)
This is when your valve flaps are `leaky` and don`t close properly. This lets blood leak back through your valve and can make your heart work harder to circulate blood around your body.
Simply changing your oil can also get rid of the tapping sound, as over time an engine that is neglected of maintenance will begin to clog up its oil filters meaning that a build-up of grime can again lead to a lack of component lubrication.
Adding more oil will make the noise go away, but it won`t solve the underlying cause of the noisy engine – the oil leak.
In most cases, a faulty hydraulic lifter will simply need to be replaced. You might be able to get away with replacing a single bad hydraulic filter depending on the make and model of your vehicle.
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Globe valves are considered the industry standard for control valves because they are good at regulating flow, whereas ball valves are better for on/off control without pressure drop.
Remove the adjustment screw access cap located at the base of the cylinder on the flow control. Turn the cap counterclockwise to remove it. Use lock-jaw pliers if the cap is tight. Turn the adjustment screw in a counter-clockwise motion to increase the airflow to the cylinder.
The size of a burn can be quickly estimated by using the “rule of nines.” This method divides the body`s surface area into percentages. The front and back of the head and neck equal 9% of the body`s surface area. The front and back of each arm and hand equal 9% of the body`s surface area.
Rule of nine
With any given valve open, count what number valve that is from the front. Subtract that number from nine. Whatever number you`re left with is the valve you`re in position to set. So, with number 1 rocker opening its valve, you`ll be setting clearance on (9 minus 1), number 8 valve.
To set preload, merely tighten the adjuster nut another half-turn after zero lash. If you are setting the lash on a mechanical lifter camshaft, use the appropriate feeler gauge between the valve tip and the rocker arm and adjust the lash until there is a reasonable tug or pull on the feeler gauge.
If you add excessive preload, the engine will run rough at idle. So finding the exact point of zero lash is critical. It demands a deft feel when you can`t see the lifter. Hope this helps answer your question.
If there`s too little valve clearance, the valves won`t fully close, causing excessive heat, and the engine will lose power.
Major camshaft manufacturers recommend setting valves cold, to avoid erroneous adjustments on lifters that may be “pumped up” If you are setting valves on a fresh engine that has not been run, everything should be well lubricated before you begin.