Valve Guide Replacement in 10 Steps
If your car's engine has the tendency to blow blue smoke when idle, then that's a problem. Ditto when it comes to it belching blue smoke while going down the road. Not only is it not supposed to do that; there's also a chance that your valve guide's oil seals in your engine has been totally blown out or worn out. With that said, here's what you're supposed to do in order to replace the valve guide or seal using only a few simple car tools.
Difficulty Level: Hard
What You'll Need
- Socket set
- Wrench set
- Air compressor
- Valve spring tool
- Compression gauge (hose)
Step 1: Remove and take apart your engine in order to access its valve spring and the valve guide. You'll need to take off the cylinder head cover, rocker arms, push roads, and spark plugs in order to gain access to the spring and the nearby guide.
Step 2: From there, activate the air compressor and regulate the air at a pressure of 60 to 90 PSI. Turn the crankshaft for good measure until the cylinder (whose valve guide you're seeking to replace) is on the top dead center.
Step 3: Turn and screw the compression gauge hose unto the hole of the spark plug then attach the air compressor hose as well. Doing this will pressurize the interior of the compromised cylinder.
Step 4: As long as the air pressure is up, the valves will stay in a closed position. Take your time when repairing the cylinder in order to make the process go smoother. For torque specs when reassembling your engine components, just refer to the service manual.
Step 5: Your assembly will also go without hitches by cleaning all your old gaskets after disassembling your engine. Don't forget to wear safety glasses as you work with small parts and compressed springs.
Step 6: Have a clothespin available in case the air compressor shuts down on its own or on your own volition for whatever reason. The clip will keep the valve from dropping back into your engine even though the air pressure has gone down.
Step 7: You'll have to remove the cylinder head to repair the valve if it drops into your engine. Use the valve spring tool to compress the spring and remove the valve keepers with a magnet.
Step 8: The spring retainer might get stuck with the spring, making it difficult to retrieve. As such, you might need a little palm-thrusting bump or small hammer tap onto the valve in order to jar the spring loose.
Step 9: Get towels or rags around the area in order to keep you from losing the keepers into the engine. At any rate, take the spring out then remove the old valve guide with screwdrivers or pliers so you can replace the new seal.
Step 10: In order to reassemble everything, just do the steps you used to disassemble everything in reverse. Don't forget to use the magnet when undergoing keep installation. Also, it might be a good idea to tap the top of the valve lightly with a hammer to seat the keepers after valve spring compressor removal.
The valve guide or seal is a metal cylinder that's integrally cast or pressed unto the cylinder head with the valve reciprocating within it. A guide is there to conduct heat from the process of combustion out from the exhaust valve and into the cylinder head, which is then taken up by the car's cooling system.