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Replacing a head gasket on a McMillan C16 air compressor

We need to replace one of the gaskets on the piston on a McMillan C16 Air Compressor and are seeking a service manual

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Posted on Jan 02, 2017

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SOURCE: Air compressor head gasket diagram

Campbell hausfeld has all their manuals on line at / you can enter the model # of the whole unit or just the # of the pump. Also you can enter just a partial number example wl650 for a list of models is that range. Use caution when installing gaskets for chpower oiless pumps. Some of their gaskets are very brittle. After installing parts, turn pump by hand to make sure all parts are in their proper place and that there is suction. Enjoy

Posted on Dec 02, 2008

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SOURCE: Instructins needed on piston ring replacement on air compressor


Posted on Nov 19, 2009

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My black&decker electromate 400 compressor runs but will not build pressure


There is an air leak in the system. check the easy stuff first. let the compressor run, and carefully feel around the ends of the tube that runs from the compressor cylinder head to the tank. You can sometimes feel where the air is escaping. You can also squirt a soapy solution on the ends of the tube and look for bubbles or pressurized air blowing the fluid back in your face :-).
When you find the leak, you will know how to stop it. Also check the drain valve at the bottom of the tank to make sure that it is closed and not leaking. Check your hose connections for leaks... remove the air hose and run the compressor.. if it builds pressure, your hose connections are leaking. The harder stuff... Take the shroud off, check the head bolts for torque and the head gasket to see if it is blown, (Use the soap solution). The really hard stuff... If you have found no leaks, the valve body or piston ring(s) are the problem. You'll need to pull the cylinder head and replace the valve body or piston or piston rings.

Good luck

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Have a look at the check valve (you will find it between the pressure switch and the tank) Make sure there is no pressure in the tank before you remove it!!! There should be a spring and and rubber or plastic valve in there. Clean it up, or if necessary, replace it. Otherwise, you may need to check the valves in the head, if the are not seating properly then you will get the air passing through. It is very irregular for the air to get passed the piston rings in the pump, but try those things and post on here to let me know how you get on


Sep 24, 2012 | Air Tools & Compressors

1 Answer

I took top of compressor off and the 2 plates that have 2 small brass plates that seem to fit into a groove on the 2 plates but cant seem to figure the correct assembly for the plates and brass plates.

The link below is not exactly like your compressor but will give you an idea of how heads are assembled. If gaskets need replacing try making them out of automotive gasket material or use the metal from aluminum soda/beer can. If you need to replace a reed valve, make it out of feeler gauge material. The reed valve needs a little wiggle room to work, try to use gasket material of same thickness. There are two chambers in the head (upper most part), one chamber is intake the other is exhaust. The intake valve is usually slightly cleaner looking than exhaust valve (exhaust valve gets hotter, looks burned) and exhaust chamber in the head is usually darker sometimes oily. Intake reed is closer to piston. Exhaust reed is closer to top of the head.

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Compressor will not build a charge.

It could be that the non-return valve isn't working properly due to a build up of oil and water, or that the gaskets have blown, or both. You can check the conditions of the gaskets inside the head, if it is torn you will need to replace them. And check the condition of the non-return vavle which should be located just before the air from the pistons enter the tank.

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I have a pancake compressor that won't hold air pressure, leaks out of the small hole in the head. I have replaced the head gasket and air pressure valuve and still leaks out of the hole in the top head.

If you replaced the head gasket then its probably the valve plate and gasket.

See here:

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Craftsman 1/3 hp compressor leaking oil

most defintly you need a head gasket but you will also need piston rings look up your local sears service center not automotive or the store you want appliance service center

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The compressor is making a clacking noise and is not pumping air

It doesn't sound like it is the valve assembly - but could be, more like the piston, rod assembly & if it is not pumping air, could be broken piston or maybe the connecting rod is broken and crankshaft is hitting the case,etc as it rotates. If you remove the head, you can see if the piston assy is working correctly, and if you have reed valve they can be changed & new head gasket put on. Unless you have an expensive compressor, if broken internal parts are in compressor, its usually cheaper to just buy a replacement compressor motor. Hope this helps you, Rick

Apr 25, 2009 | Air Tools & Compressors

2 Answers

Pressure won't build up in tank

Your compressor is the oilless type that incorporates a vinyl/teflon piston ring and a cylinder that is open from the bottom. Remove the cover and push the piston to upmost position. Look for scratches along the upper portion of cylinder. If scratched, compression is leaking thru ring and will not fill tank. Replace with Sears part #k0650 cylinder /piston ring kit to restore full power. While the compressor is apart examing the valve plate and reed valves for wear. If worn replace with part #z-ac-0032. Reed valves tend to crack or loose their shape reducing efficiency. If cylinder and ring are in fair condition, then most likely reed/valve plate is the problem. Good luck and email if you have more questions.

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