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Fresh 8N/will not start

P

Papa Joe

New User
Fresh rebuild/have spark/have fuel/timing is set/everything is new top to bottom/system charges/everything seems to be in order/engine will crank/will not fire/anybody got an idea/have checked everything a hundred times/just run down the battery and still no go!!
 
Dave, checked firing order/looks good/nly go into cam slo one way/if i turn 180 dist will not engage in slot/360 seems like it will throw enerything off/set firing order by the book/still no go
 
How can you set timing on a 1948 Ford 8N/Icant find a timing hole on the bell housing to sight the flywheel timing mark/I have spark but engine will not start....
 
If this a distributor you need to check for battery voltage to your coil on both terminals and with the points open and the ignition switch on. Use a volt meter or test lite. If there's no voltage on either of the terminals you need to check for voltage on your ignition switch terminal that feeds voltage to your coil. Run a separate wire from your battery to your coil. If's your trator is still a 6 volt system you would connect that to the negative terminal on the coil. The + plus terminal wire should go to the points. If it will start now you have a problem in your ignition switch or there's a problem with the wire that feeds battery voltage
to your switch. You will need to trace it back to where it getting voltage. Rub those new points with some 400 wet or dry too. Hal
 
Did you rebuild the starter? Is the battery fully charged? How heavy and new are your battery cables?
If the starter is pulling most of the amps to turn the engine over, there will not be enough left over to create a spark under compression. You can get a spark to jump, but will not be enough to fire under compression. A fresh engine will require the starter to work harder to turn it over. If you have a weak starter, weak or undercharged battery, or inadequate battery cables (especially 6 volt), you will have problems.
 
You don't have carbon fiber plug wires do you ? these will cause a no start.
Another thing maybe the gas mixture isn't getting drawn into the cylinders ? or maybe too much is ? are the plugs wet or dry ? when you pull them out.
 
might have to pull start it the first time i had to on my jd b with new ring dont build compression right what i do is pull start let it get warm then retorque head bolts should start on its own second time around
 
First thing to check is:Is there a spark?
Next : Is there any fuel to the carburettor? Are the plugs wet?

There may be a multitude of errors. KISS. Check out the basics first. When something does not check out, investigate further. All the suggestions below will have you on a wild goose chase for sure.

An engine needs 1) air, 2) spark at the right time, 3) compression and 4 )fuel. Only 4 systems to check out. Start with one and aim to be able to cross it off your list of possible faults.

Those faults could be timing, none or weak spark, wrong spark plug connections.

Leaking inlet manifold open valves (stuck or no valve clearance. Air constriction , choke, aircleaner.

Carb settings, filters, fuel, blocked jets, float level.

Compression should be good enough to start, but other things might be against, like slow cranking.

Electrical system is usual place to start unless a fault is indicated elsewhere.

Regards, RAB
 
But even simpler things like distributor rotor has exactly the same effect!!

Regards, RAB
 
A couple of things to look at are which way is the distributer turning?Then check your wires according to that.On a new,tight,motor the starter could be pulling all the amps away from the coil to where it might just have a weak spark.Valves adjusted right?Do you have compression on the cylinders?If the valves are too tight and dont completely shut it will not have enough compression.Also you might have spark plug wires that dont work good on old motors,or gas fouled plugs.Pull the plugs and see if they are wet.If they are wet maybe heat them up with a torch to burn the gas off.I have even lit the cylinders with a match to dry them out,but be careful and dont burn the shop down,maybe try cranking the motor over without the plugs first.All the Fords I ever worked on are kind of bad about gas fouling plugs and flood kinda easy.Pull the air cleaner hose and see if gas runs out,that usually says its flooded.
 
I thought of something else that might help.You could check and see if your rotor is pointing at the number one plug after compression.If its not,make what plug it is pointing at number one,wire in the right order using the new position for number one.Maybe check again and see if it blows your thumb off of the plug hole when you crank it over.If it does it ought to run.
 
1) I always check for spark first at the plugs. If no spark I work my way back to the distributor.
2) If that checks good check for fuel in the cylinders. Pour a little fuel in the intake or spark plug hole and then see if it starts.
3) If no start get any one cylinder up on top dead center on the compression stroke and see where you rotor is pointing.
4)If timing is set check your compression. to make sure cam is in time with the crank.
5) When cranking does it sound like it has compression?
6)Is it a 6 volt system or 12 volt? If 6 volt you may need that little extra spin to get it started
 
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