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Subject: Timing marks 8n

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AAm    Posted 07-24-2020 at 22:03:52 [URL] [DELETE]        [Reply] [Email]  
  • Timing marks 8n
  • I had the hood off my 8n for several weeks. I removed a over/under sherman from the
    tractor because I didn't use it and I had a noisy bearing. (It's for sale if someone is interested).
    After sanding and painting the hood I removed the pony tank and put hood on. I drove it around yard for a bit enjoying the ride. Shut it down, decided I could tweek it a little and make it run a bit better. First mistake, pulled dist.second mistake.
    After three days of spending lots of time and sweat I got it running.
    My question is why two timing marks and what's the difference.

    Another lesson learned.
    Avery

    Tim Daley(MI)    Posted 07-26-2020 at 05:55:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Timing marks 8n
  • FWIW & FYI, for those others who need to know: As JMOR said, timing marks are numbered on the flywheel in two places exactly 180 apart and is stated in the manuals. The timing marks can be observed on the flywheel bell housing under the window port. When engine is off, crank/flywheel stop at one of the two places so that is why you sometimes get ringgear teeth wear there. Angle mount distributors are all set and timed the same with the late 8N (after s/n 263843)timed at 4 BTDC at 400 RPM, the 600 at 8 BTDC, and the 800 at 5 BTDC. Breaker points are set at .025" +/- .001" . You need a timing light to set correctly and the procedure is also in all the manuals. Firing order is: 1,2,4,3.

    FORD 8N ANGLE MOUNT DISTRIBUTOR:


    FORD 8N (AFTER S/N 263843), NAA, 600, & 800 TIMING:



    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:


    Tim Daley(MI)

    JMOR    Posted 07-25-2020 at 15:13:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Timing marks 8n
  • The flywheel can be bolted on to crankshaft in two different positions, so with two sets of timing marks, regardless of which of the two mounting positions the assembler uses, one mark will be correct (he can't install it wrong). Side benefit, your timing light works connected to any spark plug wire. :)

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