Question about 1998 GMC Sierra
You need to mark in 2 places. With the cap off mark the position of the rotor button on the distributor housing first. Then you need to make a mark on the distributor housing that will line up with a mark on the engine itself.
When you put the distributor back in back the rotor button up before you put it in because the cam gear will turn it ahead as it seats. For example, if the rotor button is at 3 o'clock then back it up to 1 o;clock.
Don't force the distributor down at the end because you can damage the end that drives the oil pump. Fidle and wiggle it as you push and it should line up and drop onto the oil pump. Also DON'T turn the engine over while it's out or you will have to retime the engine. Hope this helps.
Posted on Jul 03, 2010
The engine should be set on TDC (Top Dead Center) with the distributor cap removed, and there is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. (Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing)
This static timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.
Then make a mark out on the engine or fire-wall where the ignition rotor is pointing to (Mark#1).
Then un-bolt the distributor and lift it carefully straight up from the engine about three inches, and watch the ignition rotor when you lift up on the distributor and the ignition rotor will turn as you lift up on the distributor, carefully lift the distributor up and as soon as the ignition rotor stops turning (after lifting the distributor up about three inches) then make another mark out on the engine or fire-wall where the ignition rotor is now pointing to (Mark #2), and then lift the distributor straight out and you should now have two separate reference marks for installing the new distributor.
Be sure that the new distributor has a new gasket or seal and that any old gasket material has been thoroughly cleaned.
Then lower the distributor into the engine with the ignition rotor pointing to the second mark (Mark #2) that you made just before removing the distributor.
Continue to carefully lower the distributor back into place with the ignition rotor pointing to the second mark (Mark #2) and as the distributor is lowered back down into the engine the ignition rotor should turn to the first mark that you made (Mark #1) and the distributor should set all the way back down with the ignition rotor pointing at the first mark (Mark #1).
Replace the bolt to the distributor and then align the #1 position on the distributor housing with the ignition rotor and then tighten down the distributor.
Posted on Jul 03, 2010
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Posted on Jan 02, 2017
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