Where should rotor point at TDC?
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.
What to do if distributor rotor is not pointing at number one?
If the rotor is not pointing at Number One, you could twist the distributor body, but if it is off by more than one tooth, this will require turning the distributor body too far. Instead, you will need to remove the distributor and repeat the previous process as the rotor is not in the correct position.
How to find the piston Stop gauge ( TDC )?
Piston Stop Gauge A more accurate way to locate (TDC) is by using a piston stop tool. Screw the tool into the #1 spark plug hole by hand; and then slowly rotate the crankshaft by hand until the piston come up against the stop.
When to use TDC between compression and power strokes?
During approach to (TDC) between compression and power strokes when both valves are closed; there will be pressure that will push your thumb off of the hose to allow air to escape. When air stops blowing out it is fairly near (TDC) on the compression stroke. Move on to STEP FOUR. Use a vacuum/pressure gauge. Hook up the gauge to your hose.
When do you need to know top dead center ( TDC )?
Whenever you are doing a rebuild, building a new engine; or simply want to check and make sure the timing marks on your damper are still accurate. So, If you’re relatively new to engine work and have ever pulled, or need to pull, the distributor or damper from your engine; finding Top Dead Center (TDC) on piston #1 becomes an instant priority.
How to calculate the timing of a TDC rotor positon?
When #1 intake valve opens and then closes, start watching through the spark plug hole. (a wooden dowel rod is helpful here) watch the piston/dowell until it is at the very TOP of its travel. STOP. Now look at the timing pointer and TDC mark on the dampner/pulley. IT SHOULD LINE UP PERFECTLY.
Where is the TDC rotor on a flathead six?
At TDC the rotor is in the one o’clock position. So, adjust the valves, set the timing and I’m ready to fire her up for the first time. I believe that the rotor should be pointing to the number 1 cylinder. Everything I can find says one o’clock for the number one cylinder to fire.
How to get the correct distributor position at TDC?
You could move the distributor between the two ‘favorite’ positions shown simply by moving the plug leads round one station, then turning the dizzy to realign the correct plug lead with the rotor position. It looks to be 60 degrees between the two. Or you could get a half move (30ish degrees) by shifting the dizzy one tooth on the drive gear.
If the rotor is not pointing at Number One, you could twist the distributor body, but if it is off by more than one tooth, this will require turning the distributor body too far. Instead, you will need to remove the distributor and repeat the previous process as the rotor is not in the correct position.