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Antique Marine Engines and Outboard Motors

1967 OMC V-4 80 HP; belt timing correct?


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  #1  
Old 07-06-2017, 01:09:23 PM
Calan Calan is offline
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Default 1967 OMC V-4 80 HP; belt timing correct?

Hello to all;
With the flywheel mark matched up with the mark on the flywheel cover, and the distributor timing mark lined up with the first "points break" mark on the distributor housing, is the belt timing correct?

I'm struggling to get the points set, (which, for me, is best done using the marks, and not a feeler gauge). The distributor cam seems to be rotated farther than it should, when the marks are lined up.

Any help will be greatly appreciated. There were a lot of ignition changes at about this time, and my service manual is quite vague as to which marks on the distributor to use to get the belt timing right. Mine is a battery / distributor ignition, with old style breaker points and coil.

Very many thanks;
Alan
Central CA
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Old 07-06-2017, 04:16:57 PM
Ed Radtke Ed Radtke is offline
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Default Re: 1967 OMC V-4 80 HP; belt timing correct?

should the setting be made at full throttle?
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Old 07-06-2017, 08:05:14 PM
Calan Calan is offline
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Default Re: 1967 OMC V-4 80 HP; belt timing correct; how to set points?

So, I think I found the mark, which seems to indicate the belt is timed right.

But, this seems to put the, "first" set of points on a high point of the cam, when the marks seem to be where the points initially break.

Everything is fine, IF I'm supposed to use the, "first" mark to set the, "second" set of points, (the ones nearest the condenser). Please let me know, if that is correct. If so, I'd be done!

I'm pretty sure points are set with the throttle closed, but let me know if that's wrong.

Yes, I am bugging the heck out of the antique outboard site, (AOMCI; I'm a club member). This motor is a bit of an oddball, made during a transition time, (I think everything was CDI by '68).

Any info welcome.
Many thanks;
Alan
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Old 07-06-2017, 10:49:09 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: 1967 OMC V-4 80 HP; belt timing correct; how to set points?

On a dual point setup, the trailing points determine the firing timing. The first set closes starting current flow, second set closes after, first set opens, second set opens and engine fires.
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Old 07-07-2017, 04:40:50 PM
Calan Calan is offline
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Default Re: 1967 OMC V-4 80 HP; belt timing correct?

Thanks!
It's counter-intuitive. The points are 45 degrees apart on the plate, and the timing marks are 45 degrees apart on the distributor housing, but the "first" set of points break on the "second" set of points.
As you just said, in far fewer words.
Very much appreciated;
Alan

---------- Post added at 01:40:50 PM ---------- Previous post was at 01:08:41 PM ----------

Edit; points and marks are 90 degrees apart; not 45.
Thanks to all!
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