Question about Air Tools & Compressors
If the heads were taken apart most likely the valve plate was place backwards causing air to come out of the intake. If the valve plate is on correctly, air coming out of intake is caused by faulty gaskets or leaking reed valves. Good luck
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Posted on Jan 02, 2017
How old is the compressor ? This trouble shooting is directed to the vane and screw types of air compressors.
For exact information on the equipment you are working on, go to the manufacturer’s maintenance and repair manual.
Here are some possibilities.
Compressor does not reach design pressure or capacity:
Air Pressure safety valve is leaking
Receiver air valve is open
Unloader valve is leaking
Loose Piping or fittings
Compressor will not load or unload:
Unloader valve defective
Air control valve is sticking or dirty
Unloader pressure is improperly set too high or too low
Water in the control lines
Plugged control lines
The air compressor CFPM is low:
Dirty air compressor air filter
Defective air intake control valve
High idle on power source improperly set
Damaged or worn rotor blades
Posted on Nov 25, 2008
It could very well be the valve plate however before you order parts take a look at the cylinders. Unplug the unit, remove the cover from crank side and turn the compressor by hand till the/a piston is at top of stroke. Examine upper cylinder for scratches /wear or failed vinyl piston ring. On oil-free compressors, dirt and grit is sucked-in from the bottom of the cylinder and causes leaks between cylinder wall and piston. If scratched, air pressure is leaking down thru cylinder wall. Failed reed valves cause a pulsation at the intake port (air seems to be pumped out the intake). If you see a model number anywhere on the pump that begins with " WL", your pump is made by Campbell Hausfeld. Parts can be ordered from www.chpower.com. other-wise order parts from sears parts. Cylinder kits are around $40. Good Luck on the repair and email if you have questions.
Posted on Apr 02, 2009
the back pressure valve has failed it costs about 15.00 and can buy from any truck parts store That's Peterbilt trucks or any large truck stores it's one of two sizes 1/2 inch or 3/4 inch when you pull it off be sure you know which way the air flow is or it will not build up.
Posted on Nov 26, 2009
SOURCE: Air leak on top of cylinder head
In all likely hood a flapping noise coming from the cylinder head means an issue with either the intake/exhaust valves or one of the restrictor plates. If you click the link below you can find a diagram for the cylinder head, page B part #107 and #110. You can also get replacement parts from them if needed.
I really hope this helps.
Posted on Dec 26, 2009
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