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| | | | Joined: Jun 2011 Posts: 291 'Bolter | | 'Bolter Joined: Jun 2011 Posts: 291 | On my 50 3100, I see a round hole above the starter at the bell housing that has a small pin that looks like a pointer for setting the timing with a timing light. I have a 55 235 engine in my truck that I recently installed. It seems to be running and starting good but I only set the timing by ear. Is this hole used for timing and if so, what is the correct procedure for using a timing light and this p[in?( My 72 chevy v8 I used to drive required idle speed with vacuum removed from the vacuum advance module) | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Jun 2011 Posts: 291 'Bolter | | 'Bolter Joined: Jun 2011 Posts: 291 | After looking at the instructions for setting timing listed above, I don't follow exactly what is meant when it reads "Set the octane selector to "0" ? How do I do this and what do I do ? The picture reference does not make it clear to me.
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | The octane setting was there because the fuel octane varied back
in the day and/or you could change it when driving at different
altitudes such as in the mountains.
Looking down at the left side of the distributor or toward the
rear of the engine, where the hold down bolt is located, you
will see a plate with some scribed lines on it. Each line is
2° allowing you to adjust plus or minus a total of 10°. Set the
center of this plate or what would be 0°, to the single scribed
index line which is on the block and lock down the bolt.
Being careful not to get into the fan blade, use your screwdriver
to loosen the clamp from the right side of the distributor or
the front of the engine, just enough that you can
turn the distributor.
Idle the engine down to 450 rpm and with a timing light on #1 spark plug,
align the ball or BB on the flywheel with the pointer in that
hole that you've already located and lock down the screw clamp.
Check the timing again to make sure you didn't move things and
this setting should be fine for 99% of the fuel and driving that
you will be doing. There is no need to remove the vacuum from the
distributor on this particular engine as long as you are using a
stock carburetor.
Denny Graham
To cold to work in the barn, in Sandwich, IL
Last edited by Denny Graham; 12/01/2014 10:37 AM.
Denny G
Sandwich, IL
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