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Driving me crazy

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e-manhunt

10-13-2006 19:37:28

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how do you adjust the timing on a 12 volt M? I got the mark on the crankshaft pully lined up with the pointer, but I can't figure how to turn the distributor so the cam on the distributor shaft has the points open with the crank shaft in that position. What am I missing here?

I've read the threads on turning the distributor etc.. but I cannot figure out what/ how i am supposed to do that. Exactly what am I supposed to be turning to advance the timing? The distributor housing? if so, how do i loosen it. everything seems to be a solid, single piece running back over the shaft and then bolting up with two bolts. From what I've read I suspect my problem with backfiring and lack of power is late timing.

Thanks in advance.

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Jossette

10-14-2006 20:12:05

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Re: Driving me crazy in reply to e-manhunt, 10-13-2006 19:37:28

loosen bolt and turn housing one way or the other..

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riverbend

10-13-2006 20:10:06

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Re: Driving me crazy in reply to e-manhunt, 10-13-2006 19:37:28

You have to loosen the two bolts to adjust the timing, Do you have a manual ? If not, get an Operators Manual. The 12 volt stuff is incedental to adjusting the timing. Turning the body of the distributor adjusts the position (timing) of the points to the cam (and the rest of the motor).

On my H the proceedure is: 1)Set the motor to the timing mark, 2) Put the coil wire 1/4" from a good ground, 3)turn the distributor clockwise, 4) with the ignition on, turn the distributor counterclockwise until you get a spark, 5) tighten the bolts.

Your M might be different, but I doubt it. If it is, someone will be along shortly to set me right.

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e-manhunt

10-14-2006 06:13:47

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Re: Driving me crazy in reply to riverbend, 10-13-2006 20:10:06

Thank you.

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Wayne Swenson

10-13-2006 19:48:48

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Re: Driving me crazy in reply to e-manhunt, 10-13-2006 19:37:28

First, make sure the timing is set correctly. Late timing (too small of a gap or incorrect setting) will act like too rich carburetor problems.
Timing should be set so the points open (set the gap first, .016" for battery ignition) when the timing pointer is between the double marks on the pulley; use the crank or turn the fan by hand (switch off) to locate the marks. With the switch off; use an ohmmeter or self powered test light to verify the point opening instant. This can be done with either #1 or #4 at TDC. Loosen the 2 distributor hold-down cap screws and rotate the body of the distributor in the direction of normal rotor travel until the points are closed (test light is on, ohmmeter reads very low ohms). Now rotate the distributor body backwards until the points JUST open; lock the cap screws and you are good to go. It is CRITICAL for the points have to be CLEAN and ADJUSTED first. If you have a 12 volt test light, turn on the switch after locating TDC and follow the same procedure. The light is on with points closed and off when the points open.
Needless to say, points, rotor, cap, & wires have to be in decent shape.

Now start the engine & warm it up in NEUTRAL and BRAKES LOCKED; run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle speed. Now turn the idle mixture screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle speed. Perform the carb adjusting procedure another time to be sure all mixtures are correct.
Don"t forget that in the winter your air cleaner may cause richness due to cold oil in the cup or even ice blocking the air passage.

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e-manhunt

10-14-2006 06:12:35

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Re: Driving me crazy in reply to Wayne Swenson, 10-13-2006 19:48:48

Thank you, both. Here is the question I guess i don't understand : My distributor cap has two spring clamps that hold it on -- am I turning to the distributor cap? If so, then how do I clamp it back on, because it appears the clamps force the cap back into the same position each time.
OR , am I loosening the two bolts which are at the base of the distributor housing -- down at the end of the shaft? I understand I only have to turn a little bitm but don't the bolt holes make everything just go back to the original alignment?

thanks- you have been a big help already.

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Dave BN

10-14-2006 07:12:04

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Re: Driving me crazy in reply to e-manhunt, 10-14-2006 06:12:35

No, you turn the whole body of the distributer, not just the cap! Since the points are mounted to the body of the distributer you will turn the points past the cam that opens them. If you are replacing points you should have a small tube of grease to put on that cam and on the post that the points ride on. Dave.

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