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Need help with a mechanical advance dizzy.


Guest Anonymous

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Guest Anonymous

Dumb question. How do you tell where the number 1 cylinder firing point is so you can make sure you put the distributor in the correct location? Currently have a vaccuum advanced dizzy. Trying not to spend 2 days doing a swap out.

Thanks

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Guest Anonymous

Old trick is to use a long screw driver, remove plug #1 or 4 and CAREFULLY rotates the crank shaft and feel the piston going tdc. then the engine is set at tdc, but you dont know then if it is under exh. stroke or adm stroke...anyway, put the dizzy rotor pointing #1, you should be done by then or it is 180 deg. out.

Pat Allen

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Guest Anonymous

They way you do it on an M30 is you pull the valve cover and turn the motor until the number one cam lobes both poijnt straight down and the last cylinder's lobes point way up. Then the motor is at TDC. I think it would be the same for an M10 motor?

-Andrey

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Guest Anonymous

Remove valve cover and turn engine until both cam lobes for #1 are pointing down. There should be a small mark on the top of the cam that is inline with the oiler bar when at #1 TDC.

Now install the dizzy with the rotor pointing to the small mark on the edge of the distributor housing. Since the rotor turns as it is inserted in the engine, you'll probably have to try it a couple times to get it to line up when fully inserted.

Matthew Cervi

'73 tii

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Guest Anonymous

I just line it up with the oiler bar. Then it's close.

There's nothing in a distributor that requires it to work in any particular orientation. So once you find TDC, you can stick the dizzy in any way that you want. I like to hav the advance diaphram point toward the exhaust manifold, because that way it doesn't hang up on anything as I change the timing. But a mechanical one doesn't have a diaphrm, so you have even more freedom. Be aware that it's going to rotate almost 1/4 turn as you put it in due to the cam and dizzy gears meshing.

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Guest Anonymous

-Look at distributor on car and find the #1 plug wire going to it (#1 is closest to front of car).

-Take off cap and "bump" the engine with the starter until the rotor points close to that spot.

-Put car in 4th gear and roll car until rotor points at line on the side of the distributor. Set hand brake.

-You may be able to verify tdc by looking in timing hole on rear of engine...you should see a line on the flywheel. Kind of faint and hard to see.

-Take old distributor out...put new distributor in and get the rotor to point to the same spot as the old one. You may have to take it out and turn it to get it just right. Turn the distributor (not rotor, the case)until the rotor lines up with the line.

-Put cap back on, set timing, tighten up new distributor.

-Start car and drive fast.

G

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