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Farmall BN timing

Farmall B & BN Tractors, 1939-1947
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Cs641
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Farmall BN timing

Postby Cs641 » Tue Jan 03, 2017 7:02 pm

Hi,

I have a Farmall BN that I'm trying to get running. About two years ago a new magneto was installed along with a new carb and we have a brand new starter to go in it. We've had this tractor maybe ten years and I heard it run briefly over the phone two years ago when the magneto went in but nothing since.

I'm trying to find the timing procedure as the relative who installed the magneto thinks that could be the issue.

Any advice is greatly appreciated!

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Eugene
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Re: Farmall BN timing

Postby Eugene » Fri Jan 06, 2017 9:19 am

I'm assuming you have found the answer by now.

The I&T Shop Service manual, IH-8, and the IH Service Manual for the tractor has pictures of the timing marks and their location.

Once the engine is set on TDC #1 cylinder, the magneto timing procedure for the B is the same as the Cub.
I have an excuse. CRS.

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Re: Farmall BN timing

Postby Urbish » Fri Jan 06, 2017 9:39 am

Eugene wrote:...Once the engine is set on TDC #1 cylinder, the magneto timing procedure for the B is the same as the Cub.


Thanks for this Euguene. I am planning to adjust the magneto timing on my B in the near future and was wondering if it was the same procedure.
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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 10:12 am

Have not found the procedure as of yet.

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Re: Farmall BN timing

Postby Don McCombs » Fri Jan 06, 2017 10:58 am

From the How To Forum...

viewtopic.php?f=140&t=44397
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Re: Farmall BN timing

Postby Eugene » Fri Jan 06, 2017 11:05 am

Setting the tractor to #1 cylinder to TDC is almost a 2 person job. One to hand crank over the engine and the other person laying under the tractor until the timing marks line up. The timing marks are on the flywheel, DC bar 1-4, with the pointer on the clutch housing.

My Allis Chalmers tractors have the timing marks on the back side of the fly wheel. 201 cubi engines, two person job to set the engine on the TDC timing mark.
I have an excuse. CRS.

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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 1:17 pm

Thanks for the info. I don't have a second set of hands so this should be fun!

A side question:

The starter was rebuilt as a 12V starter with negative ground and I know the tractor was built as a 6V positive ground tractor.

After I get the timing in order I'm going to use a 12V battery to light it off. Will there be any issues with the magneto? I don't want to fry anything. Shouldn't if I just use the battery for the starter, correct? What about after the alternator goes in? Any additional wiring needed?

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Re: Farmall BN timing

Postby Bigdog » Fri Jan 06, 2017 1:22 pm

Your magneto is in no way connected to the battery or charging system so the voltage change will not affect it. The only possible issue would be the 12 volt starter spinning the engine too fast for the impulse on the mag to kick in but I don't think you will have problems even if it does.
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Re: Farmall BN timing

Postby John *.?-!.* cub owner » Fri Jan 06, 2017 1:29 pm

If I remember correctly, the timing mark is cast into the flywheel and has to be seen through the hole in the bottom of the flywheel housing. The B, BN uses the same engine as the Farmall A (not super A).
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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 1:43 pm

There are two bell housing access holes. One is directly on the bottom and is roughly oval shaped with a wing nut.

The other is on the bottom and faces the engine, looks like any other transmission dust shield I've ever seen except much heavier duty.

Which cover to I remove to see the timing marks?

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Re: Farmall BN timing

Postby Eugene » Fri Jan 06, 2017 1:57 pm

Remove both covers. The pointer should appear in one of the holes.

Trick. Since engine was running, remove the magneto cover. Rotate the engine until the rotor points to the #1 plug wire location. This should put the timing marks, at or near the pointer.

If you remove the starter, you can use a large flat bladed screw driver and the flywheel teeth to line up the timing marks.
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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 2:02 pm

Awesome, thank you!

I've worked on many cars. This thing is so simple it's scary! LOL

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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 2:18 pm

Just to confirm #1 is the cylinder which is farthest forward, correct? And by magneto cover you mean distributor cap or the square cap?

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Re: Farmall BN timing

Postby Cs641 » Fri Jan 06, 2017 2:46 pm

Got the big the dust shield off and the small one mostly off. The bolt that the small one is held on by just spins, will probably have to cut it. The mice have moved in big time into the bellhousing. Screwdriver on the flywheel teeth gets the engine moved easier than I would have guessed. Still can't see the marks but I know where to look.

Looking at the distributor cap I see 2 markings. One is "IH" and the other says "1". That "1" is between two of the spark plug wire posts. Which plug wore post is the correct post for #1?

EDIT:

With the ignition rotor pointing at #1 the timing marks are at the 2:00 position on the flywheel when viewed from behind thru the starter hole.

Now that I have found the flywheel marks where are the marks I line it up against?

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Re: Farmall BN timing

Postby Eugene » Fri Jan 06, 2017 5:07 pm

First thing. Let's see if the magneto is firing. Remove the plug wire from the center of the distributor cap and place that end about 1/4" from a ground/engine block, etc.. Crank over the engine. You should hear the magneto click (impulse coupling) and get a good blue spark between the end of the plug wire and ground.

No click, faulty impulse coupling. Impulse coupling clicks and no spark - bad coil or short inside the magneto case.

Suggest obtaining an Operator's Manual and Service Manual for the tractor. Both will have directions for and photos of the magneto ignition system and a photo of the magneto mounted in the tractor.
I have an excuse. CRS.


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