Determining top dead center
(→The procedure) |
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Replace the spark plugs and wires. Remove the masking tape, reinstall water pump, pulley, fan, shroud and belts if they were removed previously. Replace any coolant/water you may have lost in the operation. | Replace the spark plugs and wires. Remove the masking tape, reinstall water pump, pulley, fan, shroud and belts if they were removed previously. Replace any coolant/water you may have lost in the operation. | ||
| − | Remove the cap from the distributor and align the rotor with the cap terminal that coincides with #1 plug by rotating the distributor housing. On a Chevy, clockwise rotation of the housing retards the ignition timing, counter-clockwise advances it. | + | Remove the cap from the distributor and align the rotor with the cap terminal that coincides with #1 plug by rotating the distributor housing. Looking down on the motor from a birds-eye view, the rotor needs to be pointing toward 5:30 on an analog clock face (pointed toward #1 cylinder). The gears that drive the distributor off the camshaft are helical, so you need to drop the distributor into place so that it can spiral down and be in the correct position when the distributor housing is seated on the intake manifold. On a Chevy, clockwise rotation of the housing retards the ignition timing, counter-clockwise advances it. |
| − | From #1 plug position on the cap, the wires will be attached clockwise around the cap following the firing order (Chevy 1,8,4,3,6,5,7,2). | + | From #1 plug position on the cap, the wires will be attached clockwise around the cap following the firing order (Chevy 1,8,4,3,6,5,7,2). As was stated in the last paragraph, the rotor should be pointed to the 5:30 o'clock position to fire #1 plug. This will give maximum clearance between the vacuum canister and the runners of the intake manifold and firewall so that you have room to twist the distributor to fine-tune the ignition timing when you get the engine running. |
If the valve cover was removed earlier, set the valve cover on the head to keep oil from flying everywhere and start the engine and allow it to warm up. Do the final adjustment on the #1 cylinder rockers. | If the valve cover was removed earlier, set the valve cover on the head to keep oil from flying everywhere and start the engine and allow it to warm up. Do the final adjustment on the #1 cylinder rockers. | ||
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