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Subject: 8N missing under load

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Tom8n396936    Posted 06-16-2017 at 12:20:28 [URL] [DELETE]        [Reply] [Email]  
  • 8N missing under load
  • Hello all. Most often I am a reader of the site and very seldom post. I have an issue that one of you may have some insight into. My 1951 8N side mount distributor seems to really lag under load. I was raking hay and if the hay got heavy the motor would bog down. That may be normal but even when I pushed the clutch in it still took a bit of time for the motor to recover. Same thing while brush hogging - too much load and then a delay in the engine coming back up to speed even with clutch in. Would any of you have any ideas? This is a "new" rebuilt motor and I don't recall my old one
    acting this way?
    Any advice or things to check would be welcome!
    Thanks and be safe.
    tom

    steveVa    Posted 06-17-2017 at 11:18:36 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • Your symptoms would usually point me to points being too tight, but since you have electronic ignition that gets a pass. So next that points me to a carb issue or possibly the governor. Next check the fuel flow to make sure it's not starving for gas at higher rpms. I also keep a spare coil around to rule that out with an easy swap. I have saved myself a lot of time chasing other things with a simple coil swap. That way no adjustments get out of wack and it is clean and easy way to check connections as well.

    Famer Brown    Posted 06-17-2017 at 06:24:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • I have had same problem with my 9N. Plugs, go witth the Champion H12's and had a coil do that but that would act up after 30-45 minutes of hard brush hoggin.

    Tom 8N396936    Posted 06-16-2017 at 15:26:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N missing under load
  • I forgot to mention that I put an electronic ignition in it - Petronix brand?
    Thanks for all the great suggestions. I will let you know what I find out.
    Thanks!

    Rustyal    Posted 06-16-2017 at 15:15:00 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • Check the points, plugs and timing. Then you may want to look at the governor as it kicks in when the tractor bogs. I'm thinking the hay equipment could be to much for your tractor. My hay rake is to big for an n.

    K.LaRue-VA    Posted 06-16-2017 at 13:31:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • When any engine is overloaded, it will drag the RPM down and start running rich. The longer it runs like that before load is removed, the more fouled the plugs will get. It can take a while (or never) to clear fouled plugs. The hotter Autolite 437s will usually clear out and run right. A properly tuned engine will pull more load, and recover faster. As Bruce pointed out, even a fresh rebuilt engine won't pull load if it isn't properly tuned.
    KL

    Bruce (VA)    Posted 06-16-2017 at 13:12:29 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N missing under load
  • When is the last time you replaced the points, plugs, condenser rotor & cap and set the timing? A rebuilt motor stills needs a tune-up.

    Get out your timing light & check to see if the timing is advancing.

    See tip # 14 at the link.

    Tim Daley(MI)    Posted 06-16-2017 at 15:30:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • ...would the next step be a bad governor?

    Tim Daley(MI)

    Bruce (VA)    Posted 06-16-2017 at 18:15:20 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8N missing under load
  • Or a governor out of adjustment.

    JMOR    Posted 06-16-2017 at 19:52:38 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8N missing under load
  • This truck was almost missing under load...........I suggested verifying timing, both static & at full rpm.

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