View single post by Esprit2
 Posted: 08-12-2014 02:49 am
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Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 338
srq2002 wrote:
I'm reinstalling the timing belt and concerned about the setting of the ignition pulley. Can anyone tell me if this diagram shows the mark correctly aligned? Or is the alignment mark unreliable?The alignment mark is reliable, it's just not as critical as it is on the cam pulleys. The cams need to be right, but the auxiliary pulley has some latitude.

There's a direct connection between the auxiliary pulley and the rotor in the distributor. The rotor can be positioned anywhere, and the distributor body can be rotated as required to achieve proper timing at that position. Functionally, the distributor doesn't care where the rotor (hence, the auxiliary pulley) is located; however, there are practical matters.

In certain positions, the spring clips that retain the distributor cap will interfere with the cylinder block and other bits such that they're difficult to snap or release.

Wires for electrical connections to the distributor may be too short to reach some positions.

If the distributor has a vacuum diaphragm on it, then the diaphragm will interfere with the oil filter in one direction, and the intake manifold in the other. The rotor needs to be positioned so that correct timing can be achieved with the diaphragm in that sweet spot between the filter and manifold.

You can ignore the pulley timing mark, and wing it as required to get ignition timing without any fit problems. Or you can take a couple of seconds to align the auxiliary pulley timing mark, and be pretty sure it will all work.

The cam timing marks and ignition timing marks on the pulley are different. The mark for cam timing will be next to an IN or EX mark, and the ignition mark is across the pulley from there. The ignition mark is supposed to be aligned with the imaginary centerline between the crankshaft and auxiliary shaft.

Install the timing belt, and randomly crank in a bunch of tension. Double check the alignment of all timing marks. Then set the static ignition timing prior to tensioning the belt for real. If there's a problem with timing the igniton that can be resolved by re-positioning the rotor (ie, moving the aux pulley on the belt), then it's better to discover that before wasting effort tensioning the belt for real. With the static ignition timing set, tension the belt and button up the job.