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Timing a vac

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Don

07-24-2002 07:07:11




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Could someone tell me how to time a case vac. This is for a friend.Any help? Thank`s Don.




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mj

07-24-2002 11:27:35




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 Re: Timing a vac in reply to Don, 07-24-2002 07:07:11  
I assume that you have a distributor ignition? If so, then the manual reads as follows: "Turn the engine over with hand crank until #1 piston is at top dead center (TDC) of compression stroke. The compression stroke can be determined by removing the #1 spark plug and placing the thumb over the spark plug opening as the engine is turned over until an outward pressure can be felt. To determine TDC, the dead center marking of the flywheel ( D/C) will be directly opposite pointer on the left-hand side of the flywheel housing (under inspection cover). Remove distributor cap. Notice position of breaker points. With crankshaft in this position the points will be just starting to open. Press rotor against its' normal direction of rotation (Normal direction is clockwise). This takes up backlash in the driving gears. If position of rotor is not correct, loosen the clamp of adjusting plate at the base of distributor and rotate distributor in direction necessary to obtain proper setting. Rotation of distributor in a clockwise direction retards ignition and rotation in a counterclockwise direction advances ignition. This distrbutor is equipped with a centrifugal governor control. The entire advance from idle speed to full engine speed is 26 degrees.". Note: Using a test light hooked to the points will show the exact moment that the points make and break the circuit. You can also, after setting the timing as outlined above, run the engine with a timing light attached to #1 spark plug for a future reference point. I hope this helps you "get in the ballpark". I've found that a wee bit of "in the field " timing changes can be beneficial.

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