46 2n

[boler76]

and more questions, so My problem is that no matter how well I can get the engine to run it
still runs smooth for a few seconds then pops and the vacuum on manifold drops about 1/2
momentarily, Have cleaned and rebuilt carb, checked that there is constant spark at all plugs,
even with the popping there is no spark hesitation, checked the 3 jet sizes in carb to be what
is stated in manual, When it is tuned in the manifold vac is 21.5 and very steady until it pops
, which it does 2-3 times then levels out again and this is at 180 deg engine temp and at all
speeds, engine throttles up and down but always ends up popping what are you guys thoughts?
Thanks

 

[oldsarge]

check valves

 

[John Deere D]

I owned a Tractor that acted like yours ...the valve guides were outside operating limits.....

Bob..

 

[Tim PloughNman Daley]

Do you have the wiring correct? 6V or 12V? Firing order is: 1,2,4,3 CCW. Folks will sometimes get the #3 & #4 Plug connections at the crab cap crossed. Have you ad the distributor off? yes? Did you get it timed and tested and mounted back on correctly?



FORD TRACTOR 9N & 2N OEM 6V/POS GRN WIRING:

<img src=https://i.imgur.com/QWaC1aah.jpg>​

<img src=https://i.imgur.com/CJedLEch.jpg>​

FRONT MOUNT TIMING PROCEDURE:

FORD FRONT MOUNT DISTRIBUTOR WHAT HAPPENS WHEN MOUNTED 180 OFF:

FORD TRACTOR FRONT MOUNT DISTRIBUTOR FIRING ORDER; 1,2,4,3 CCW:

Tim Daley(MI)

 

[boler76]

well the whole valve train has been changed, new guides, new valves, new springs and seats ground and valves set with new adjustable lifters, the distributor has been gone over and has neglible bearing wear and timing set according to book, tractor starts and runs well except for the popping every so often, ?? thanks for input

 

[boler76]

do you think a valve could be intermittently sticking and if so how to find and fix it??? thanks

 

[John Deere D]

I would start the Tractor .......as it approach's 180 F I would remover ONE high-tension spark plug lead ....
If popping is non existent....I would check the ignition to the above plug Strobe light.... then check valve setting / valve tappet clearance to both valves.

If popping is evident...attach high-tension spark lead.....remove lead to next spark plug...etc,etc...

Bob..Owner Ford 2-N

 

[boler76]

I will do that test thank you John Deere D

 

[boler76]

so I did the removing spk plug wire from one at a time and there definitely is spark to each one but the popping goes away no matter which plug wire is off and returns when it is replaced, I had set and reset the valves clearances to the specs in manual, do you think they could all be questionable ?? thanks