8 n handcranks

[sgtbull]

Can someone advise the dimensions of an original 8n handcrank? I've started making handcranks for Farmall cubs, and think 8n's would be just as simple.

 

[Bob Harvey]

The JACK handle from an 88 Mazda pickup fits perfectly.

 

[JMOR]

(quoted from post at 10:12:36 01/06/09) Can someone advise the dimensions of an original 8n handcrank? I've started making handcranks for Farmall cubs, and think 8n's would be just as simple.

One source says:

The original 8N crank was of forged construction, the pin was of a tear drop shape, forged (swedged) in and is oriented to best engage the crank bolt. It is of 11/16" stock and its dimensions C-C are, 14",7-1/2" and 4". Swedged pin center is about 3/4" in from the end and is about 1-3/16" long. Longer version if bumper equipped.

 

[ZANE]

Good way to get a broken arm!

Tractors with magnito's are designed by the way the mag works to retard the spark ignition timing so the engine can't kick back. Once the engine starts the ignition timing automatically goes to advance setting.

Zane

 

[JMOR]

(quoted from post at 11:00:03 01/09/09) Good way to get a broken arm!

Tractors with magnito's are designed by the way the mag works to retard the spark ignition timing so the engine can't kick back. Once the engine starts the ignition timing automatically goes to advance setting.

Zane

And to add to Zane's comment, distributors ain't made with the impulse or retard function.

 

[ebooth]

I had an IHC 1020 and a McCormick F12 They both had Mags. Mags have what they call an impulse. This impulse makes the mag have the same fire power at 1 RPM as it would at 1200 RPM. They also had a retard and advance lever. You retard the spark to crank the tractor or it may kick and hurt you break thumb arm etc. On 8N or similar the automatic spark advance takes care of that (weights in distributor) if you have to crank the engine to start it.
ebooth