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See full version: Q: with the#1 piston up were should the rotor button be pointing
If you need some assistance with this, consider YourMechanic, as a certified technician can come to your location and help you with this is person. Good luck.
The rotor button should be pointing to the number 1 position on the distributor cap when the number 1 piston is at top dead center (on the compression stroke). The pistons come up two times during the combustion cycle. Once for the exhaust stroke and again on the compression stroke. The mechanical ignition timing should be set so that the rotor hits the corresponding cylinder on the compression stroke to ignite the air/fuel mixture. [links]
If I have the #1 piston up were should the rotor button be pointing when I pull the distributor cap off.
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The distributor cap only goes on one way due to the notch in the bottom. So you are locked in to that position. Now notice on the TOP (not the side) of the distributor cap the is a ” 1 ” raised letter. That indicates the tower where No 1 spark plug wire goes.
Contact breaker with points fully open. The gap shown is exaggerated for clarity. Place the feeler gauge blade between the points, and a screwdriver blade in the adjusting slots. Tighten the fixing screw, then check that points gap remains the same.
Generally speaking, it is easiest to set the points when the piston is at TDC. Make sure the points are only open the thickness of the feeler gauge — aka, that the feeler gauge is not twisted and causing the points to be more open than they should — and then tighten the points screw back down.
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In many cases, the reason why the distributor cap and rotor fail at the same time is that they work together to accomplish the same task; which is distributing voltage from the ignition coil to the spark plug. When the rotor begins to wear out, the bottom terminals on the distributor cap does the same. If the distributor cap becomes cracked, condensation can enter the inside of the cap, which will literally drown out the electrical signal.
When you have finished this task, the replacement job of the distributor cap and rotor has been completed. If you've reviewed the steps in this article and are not confident completing this project or need an extra set of professional hands to help fix the problem, contact YourMechanic.com today and one of our local ASE certified mechanics will be happy to assist you replace the distributor cap and rotor.
Install the new screw from the kit in the rotor hole (if it has one) DO NOT USE THE OLD SCREW
As with any service, replacing the distributor cap and rotor will begin with making sure you have clear access to all the tools and supplies you need to complete this task. You don't have to jack the vehicle up or raise the vehicle on a hydraulic lift to complete this job. Please refer to your service manual for detailed instructions as the steps listed below are general steps. here