timing gears

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69ranger
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Tractors Owned: 1948 Cub, 1952 Cub, 1953 Cub, 1946 Farmall A, 1949 Farmall M, 1956 IH 130, 1979 IH 140, 1959 Farmall 240.
Several Brand X Green tractors that sound strange when they run.
1969 F-100 fully restored, 1969 F 100 original paint, 1973 F 100, 50 K original miles all original, 1978 F250 repainted, 1978 Bronco, 1967 Mustang, 1973 Mach ! Mustang.
Several single cylinder Honda motorcycles from the early 70's. Adding more junk all the time.
Location: Parsons, Kansas

timing gears

Postby 69ranger » Fri Dec 17, 2021 11:33 pm

Hello everyone,

Tonight while working on the cub motor, I ran into a problem. The way the book shows the timing gears, seems pretty straight forward, and I have timed up engines in the past..
:lost:
The cam gear has one mark, that lines up with the one dot on the crank gear, and the idler gear has two marks that line up with the two dots on the crank gear. All seem to be arranged correctly, as the manual shows.

Now comes the part that i am struggling with. there is another mark on the idler gear that is approximately 8 o'clock or exactly 9 teeth to the left, or clockwise, when facing the engine. This mark is not where it is supposed to be, or at least where the book shows it to be.

I am pretty sure this mark probably don't matter that much, as long as the governor lugs are where they are supposed to be at roughly 2 and 8 looking in from the magneto side. However as of now they are not, when I have the line and mark on the magneto side of the gov gears lined up.

I am running a magneto, so I wont have the as much adjustment on the timing, and it needs to be perfect.
By the way, the # 1 piston is a top dead center on the compression stroke, and I put the cover and crank pulley on just enough to confirm that its pointing at the right spot.

Any help is greatly appreciated, as i am about to open up a salvage yard starting with this one.

I took a picture of it, but cant seem to get it to post. I reduced the size as much as I could be it still is too large.
Its not been a very good night

Sorry for the long winded post, and I hope my above info in understandable.

Thanks to any one willing to tackle this mess.

tst
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Re: timing gears

Postby tst » Sat Dec 18, 2021 12:01 am

marks are on the other side of the ear to line up with the governor gear

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Glen
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Location: Wa.

Re: timing gears

Postby Glen » Sat Dec 18, 2021 1:55 am

Hi,
Align the matching marks on the front sides of the gears. Then the mark for timing the governor gear should be in the right place.

The mark for timing the governor gear is on the rear facing side of the idler gear.

Below is a pic from TM Tractor showing the mark. It is 1 mark, on the rear side of the gear.
It is on the right side in the pic.

The 2nd pic shows the timing mark on the governor gear, it is 1 mark, on the left side of the pic.
You have to use a light, and look forward, in through the hole in the block for the magneto drive.
It important that the marks be aligned, so the magneto can be timed right. :)
Attachments
Cub idler gear.jpg
Cub gov gear 2.jpg

tst
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Re: timing gears

Postby tst » Sat Dec 18, 2021 3:05 am

paint the teeth so you can see the alignment when installing governor to idler as you cannot se the dots at that point

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Bill V in Md
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LT1045 Cub Cadet
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Re: timing gears

Postby Bill V in Md » Sat Dec 18, 2021 8:36 am

Maybe this reference will help: Page 41 of the IH Engine Service Manual has a good photo of the assembled timing gears in their proper orientation with timing marks. You can access this manual from the Quick Links tab.
Bill VanHooser
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69ranger
5+ Years
5+ Years
Posts: 180
Joined: Sun Jan 20, 2013 10:36 pm
Zip Code: 67357
Tractors Owned: 1948 Cub, 1952 Cub, 1953 Cub, 1946 Farmall A, 1949 Farmall M, 1956 IH 130, 1979 IH 140, 1959 Farmall 240.
Several Brand X Green tractors that sound strange when they run.
1969 F-100 fully restored, 1969 F 100 original paint, 1973 F 100, 50 K original miles all original, 1978 F250 repainted, 1978 Bronco, 1967 Mustang, 1973 Mach ! Mustang.
Several single cylinder Honda motorcycles from the early 70's. Adding more junk all the time.
Location: Parsons, Kansas

Re: timing gears

Postby 69ranger » Sat Dec 18, 2021 9:40 pm

Thank you all for the help. I did not get to work on it today, but did go out and find the mark on the back of the gear.
I am going to ignore the other mark on the front of the idler gear is meaningless, and the other mark seems to be the right place, so I should be fine now.
I will hopefully get the most of it back together tomorrow, after Church.

The rest of my parts came in today, while i was gone.

Again... thank you!


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