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Posted by Galen [67.142.171.23] on Friday, February 22, 2013 at 19:33:03 :
In Reply to: Re: Distributor points and dwell posted by Sterling From TX [99.58.180.94] on Friday, February 22, 2013 at 13:48:40 :
You need to do a static timing test. This assumes and a big assumption is that the timing marks are lined up on the timing gears.
If in doubt, remove the chain case and observe the dots. They MUST be in line using an imaginary line through the centers of both.
Not sure of the firing order ( check PIF or PW engine manual or VPW can help you there). the timing mark on the pulley should align with the pointer on chain case cover when #1 piston is at the prescribed setting (advanced or before) top dead center.
Make sure your plugs are going to the correct places on the distributor. distributor rotor should be pointing to where the number one plug wire is on the cap when at top dead center. This constitutes static timing. I suggest going to the CJ3B Page (jeep) forum and read over any discussions on timing. They have some great material on timing on the CJ3B Bulletin Board. Although jeeps use a 4 cylinder engine the principles still apply.
Don't worry about adjusting your carburetor until you have the ignition timing correct
The motor must be warm hence running before you adjust the idle mixture. Keep the idle at about 600 rpm. Turn the screw until is makes the motor just about quit then open up a 1/2 turn. Listen for the rpms increase. Make sure you have the points an plugs properly gapped using a feeler gauge. If the plugs are sooty then the mixture is too rich. May be due to plugs not hot enough or bad condenser, or improper float setting- unlikely if VPW is rebuilding your carb. Plug electrodes should appear grey color. Make sure you have a strobe style timing light and hook it up correctly with a warm motor. Aim it at the crank pulley timing mark and it should be in line with the pointer as the engine is running. have you checked the compression of each cylinder? The actual reading is less important and the degree of difference between each- should be no more than 10% difference of the lowest and highest reading. You can also check the vacuum which will give you insight on the valve timing. Hope this is a start on your tune up.