distributor 180 degrees off?

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catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sat Aug 11, 2018 8:16 pm

GLEN!
picture 2001-41 has my full attention! Looking into the governor side, I can find the 2 stamp dots for the 18 tooth crankshaft to the 36 tooth idler. but I cant find the single stamp dot to line up the ignition drive to the 36 tooth idler. Are the stamps on the same side or is the ignition drive stamps on the back side of the idler. I've been lining up the governor ignition drive dot with the 2 dots for the crankshaft! That's probly why things arn't lining up. But those are the only ones i can find. GAINING ON THIS CUB BUT LOSING MY SANITY!!!!

catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sat Aug 11, 2018 8:46 pm

http://www.farmallcub.info/manuals/gss- ... 001-42.jpg

This page says to mesh single dot with double dots. but the other picture shows they are both single dots.

my brain is gonna explode

catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sat Aug 11, 2018 8:55 pm

well, it doesnt say double dots it says the two chalk marked teeth, but 70 years later i doubt the chalk is still there

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Glen
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Re: distributor 180 degrees off?

Postby Glen » Sat Aug 11, 2018 9:43 pm

Hi,
Sorry if you are confused.
The page you posted above says at the Note, at the top of the page to mark the teeth edge with chalk, so they are easy to see.
It looks like they marked 2 of the teeth on the idler gear, and didn't really say they did that. It looks like the mark on the governor gear goes between those 2 marks.
The 2 marks are not already there, they are saying put chalk on the teeth.

You could put 1 mark on the idler gear, to align the mark on the governor gear.
There is a single mark on the idler gear on the side facing the rear of the engine, you can see it in the pic looking in through the hole in the engine, in the page you posted. There are not 2 punch marks on 1 gear facing rearward.

The 2 marks on the front side of the idler gear are for timing with the crankshaft gear only. The 2 marks on the front side of the idler gear should be down aligned with the crankshaft gear when you have the engine at number 1 cylinder TDC.
Don't use the 2 marks on the front side of the idler gear to align with the mark on the governor gear.

The single mark on the rear side of the idler gear is to align with the single mark on the governor gear.
Find the single mark on the rear facing side of the idler gear.
I posted the gears and marks in a post on the 2nd page of this post. The single mark is on the rear facing side of the idler gear.
The single mark is nearly half way around the gear, on the other side of the gear from the 2 marks on the front of the gear.

catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sun Aug 12, 2018 9:13 am

I have a mirror ill look for the single mark. thank you!!

catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sun Aug 12, 2018 9:37 am

Here's an honest question. If my rotor has to be at 2 and 8 what difference does the teeth make? as long as I'm at TDC and the rotor lines up at 8 o'clock and 2 o'clock?

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Re: distributor 180 degrees off?

Postby Crimson Tim » Sun Aug 12, 2018 9:48 am

2 and 8 is not very precise, it’s just a rule of thumb to provide a quick check if things are obviously off. Are you at 2:07 and 8:07 or 1:55 and 7:55?
I believe I have heard that you can luck into the proper timing of all the outer components even if the dots inside are not in proper alignment, but making sure the dots are aligned removes several of the variables of the timing equation.

catmotorhead
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Re: distributor 180 degrees off?

Postby catmotorhead » Sun Aug 12, 2018 9:52 am

thanks Tim, thats a fair answer. I'll suck it up and take it apart again!

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Re: distributor 180 degrees off?

Postby catmotorhead » Sun Aug 12, 2018 6:49 pm

i found it. it was right there when the engine was at TDC. timing is set i believe but she doesn't start. fires an awful lot. i pulled the plugs out after choking and hand choking the breather and they are dry. I don't believe they getting gas. tomorrow I'll look into that mess.
Thanks for the help

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John *.?-!.* cub owner
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Re: distributor 180 degrees off?

Postby John *.?-!.* cub owner » Sun Aug 12, 2018 8:47 pm

If it has an IH carb the load jet screws into the side near the bottom, and frequently becomes plugged especially after setting a while. Don't forget to turn the gas on. Don't ask why I would think of that. :oops:
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Glen
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Re: distributor 180 degrees off?

Postby Glen » Sun Aug 12, 2018 10:30 pm

Hi,
Good that you found the timing marks.

Below are pics of what John said above. The 1st pic shows where the main jet is on the IH carburetor.
It is the 6 sided brass colored part on the lower side of the carb. It screws out.
Clean it with a small wire, like is shown in the 2nd pic, then wash the jet.

You could check the gas flow at the carb.
If you turn on the gas when the main jet is out of the carb, gas should run out of the hole in a stream.
Let it run for 30 seconds to see if the stream is steady. Catch it in a clean can, and you can put it in the gas tank again, if it looks clean.
The carb could have plugged passages, if it was sitting with old gas in it.

Tighten the main jet, and everything on the carb gently, the carb is soft metal, and the threads can strip out.
Sometimes the gasket on the main jet doesn't seal again, if it is old, and you reuse it. TM Tractor has a new gasket for it, or some gas resistant sealer might seal the gasket. :)
Attachments
Cub carb 3.jpg
Cub jet.jpg

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John *.?-!.* cub owner
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Re: distributor 180 degrees off?

Postby John *.?-!.* cub owner » Mon Aug 13, 2018 10:17 am

catmotorhead wrote:Here's an honest question. If my rotor has to be at 2 and 8 what difference does the teeth make? as long as I'm at TDC and the rotor lines up at 8 o'clock and 2 o'clock?
If the rotor is not timed right, it will not deliver spark to the right plug wire when it fires. The mark on the back of rotor (opposite pointer arm) should line up with a notched tooth on the drive gear, or on some gears a dot, every other round of the drive gear.
viewtopic.php?f=140&t=83108

If you have lots of fire you need to make sure it is at the right plug at the right time.
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Re: distributor 180 degrees off?

Postby staninlowerAL » Mon Aug 13, 2018 11:02 am

catmotorhead wrote:Here's an honest question. If my rotor has to be at 2 and 8 what difference does the teeth make? as long as I'm at TDC and the rotor lines up at 8 o'clock and 2 o'clock?
Adding to John's explanation, the spark to the plug has to be delivered at the time both valves are closed to fire correctly. Valve position is determined by the timing of the gears with the timing marks. If the marks are not set correctly not only will the spark not be correct for the plug but incorrect for the valve positions.

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Re: distributor 180 degrees off?

Postby Eugene » Mon Aug 13, 2018 4:01 pm

The spark timing on a magneto is fixed in only one or two positions, TDC during engine start up and the advanced position upon engine starting. The spark occurs when the points open.

You can set the magneto's rotor any place you want, but if the magneto spark timing does not occur at TDC #1 or #4 cylinder and the rotor's position is not correct, no starting - running engine.
I have an excuse. CRS.

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Re: distributor 180 degrees off?

Postby Glen » Mon Aug 13, 2018 5:20 pm

Hi,
Below is a pic of the rotor and rotor drive gear alignment, for the magneto.
I would look at them, and be sure they are aligned right, if you didn't. Remove the 2 screws that hold the cover on, to get to it.
The Cub owner's manual says clean the area, and apply new grease to the gears. :)
Attachments
Cub magneto 4.jpg
Cub magneto 4.jpg (25.13 KiB) Viewed 62 times


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