8N running on 2 cylinders, need to make hay!

#3 and 4 are not firing at all, though they have spark.
Compression test results:
(cold, dry, throttle wide open):
#1-105, #2-95, #3-89, #4-100

(cold, with oil in cylinder)
#1-135, #2-115, #3-110, #4, 100 (#3 blows oil mist out sparkplug hole while I test #2)

(engine warm)
#1-110, #2-107, #3-80, #4-100

Granted, looks like rings are worn, but shouldn't #3 and 4 still fire with this amount of compression? Always used to, till recently. Again, they ARE getting spark!
 

Should have mentioned, I swapped the plugs from 3 and 4 to 1 and 2, and put new wires on 3 and 4. Cleaned contacts on the cap--cap looks okay, is new. Maybe I should replace it anyway?
 
(quoted from post at 05:30:38 05/21/17)
Should have mentioned, I swapped the plugs from 3 and 4 to 1 and 2, and put new wires on 3 and 4. Cleaned contacts on the cap--cap looks okay, is new. Maybe I should replace it anyway?

Was it all working before? What happens if you put all the old parts back where they were originally?

I'm also intrigued why you swapped plug locations....

es
 

So I just swapped wires and distributor cap from other 8N that's running fine, and it runs exactly the same--still not firing on 3 and 4. BUT, I just realized that sparkplugs 3 and 4 don't go straight into the head like on my two other 8Ns--they go into a "riser" that is bolted into the sparkplug hole--what's this about? Is that because someone stripped out the sparkplug holes, and jury-rigged this to accept spark plugs? Must put the plugs 1/2 inch higher in the cylinder. Still, it ran fine until recently.
 
(quoted from post at 06:35:05 05/21/17) Okay, tried that--won't start at all the other way, so they must be correct--also, they match another 8N.

The evidence so far (anti-fouling adapters) points to oiling in cylinders 3 and 4, at least as a contributing factor, if not the root cause of your woes. Being as my first car was a '71 Vega, I'm well familiar with this problem. Did you thoroughly clean the plugs (all of them) before reinstalling? Even with the adapters, cleaning my plugs was a (short interval) maintenance item on the Vega until we rebuilt and sleeved the engine.

es
 
You may not be able to fix your problem short of an engine rebuild .

You may be able to help by using hotter plugs , Autolite 437 or Champ H - 12 I think , someone will be able to correct if those numbers are wrong .

Make sure you have a thermostat , preferably a 180 degree . You want the motor to run in the hot side of the normal range to help burn off the excess oil .

Make sure your air filter is clean and air is flowing freely . You do not want it gasping for air and sucking more oil around the rings .

Make sure your carb is not running rich and fuel fouling the system and compounding the problem .

Giving the motor a workout may help keep the oil burnt off or you may need to baby it depending on how bad the consumption is .

How much oil does it go through ? A quart per tank , two quarts every five gallons of gas ? Is it leaking oil also ?
 
Dave.......Ford specs: 90psi MINIMUM; good runnin N's 110psi; BRAND NEW N-engines 125psi. Those spacers are a "trick" fer oil burners. Raises the plugs outta the oil being pumped by the rings. Ford even sell'em p/n 2N12426. As fer yer sparkies; recommend AutoLite 437's gapped 0.025. 216's and H-10's (OEM) are too COLD and won't burn the OIL being pumped by the rings. BTW, 1-tps (1-oz) oil down the sparkie hole is way to judge the WEAR of the piston rings. +30psi is really WORN; +10psi is like new........HTH, Dell, yer self-appointed sparkie-meister
 
[b:c655426669]"1-tps (1-oz) oil"[/b:c655426669]

not sure what u meant by tps.

one ounce = two tablespoons (tbs,tbsp) = six teaspoons (tsp)
 
(quoted from post at 15:56:56 05/21/17) [b:9f4c2c53ad]"1-tps (1-oz) oil"[/b:9f4c2c53ad]

not sure what u meant by tps.

one ounce = two tablespoons (tbs,tbsp) = six teaspoons (tsp)

Could that be "The Plural Spoon" so you would need two ?
 
(quoted from post at 18:30:14 05/21/17)
(quoted from post at 15:56:56 05/21/17) [b:3671ff22b6]"1-tps (1-oz) oil"[/b:3671ff22b6]

not sure what u meant by tps.

one ounce = two tablespoons (tbs,tbsp) = six teaspoons (tsp)

Could that be "The Plural Spoon" so you would need two ?

ohhh, i hadn't thought of that. this is getting complicated now :)

a wiser man than i once said "one hippopotami cannot get on a bus, because one hippopotami is two hippopotamus."
 
yeah, 1-tablespoon = 3-teaspoons so I miss-abreviated tablespoon. The concept is the same, use some oil to seal the rings.........Dell
 
(quoted from post at 21:41:16 05/21/17) yeah, 1-tablespoon = 3-teaspoons so I miss-abreviated tablespoon. The concept is the same, use some oil to seal the rings.........Dell
ext time, just say a squirt or two....save some postings, but whizz off YT, due to reduced hit count!
 
Put two Al437s in it--gap them to about 3/16--go to work--if they foul
change them..There is no other Band-aid that will work better..
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top