Timing marks on crank pulley

The Cub Club -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
Dave F.
10+ Years
10+ Years
Posts: 505
Joined: Fri Feb 07, 2003 12:36 pm
Location: WV, Morgantown

Timing marks on crank pulley

Postby Dave F. » Fri Feb 07, 2020 8:24 pm

Correct me if I Am wrong. While hand cranking the engine over to see the timing marks, the 1st mark to the pointer should be 16 degrees before tdc ? and the 2nd mark should be tdc. If this is correct where do I set my timing ? I've installed a Pertronx electronic ignition. And I want to use a timing light to to set timing Also do I set timing at 16*before tdc or top dead center? Thanks Dave F.

coppersmythe
10+ Years
10+ Years
Posts: 1595
Joined: Thu Dec 24, 2009 9:19 am
Zip Code: 00000
Tractors Owned: '48 trimmed dash high crop cub , '78 3/4 cub , lo-boy/59 mower , '64 "galvanized" cub , cub-6 toolbar , sicklebar mowers , 54 blade , plow , mott mower , early belly mower . . international 1010 pickup with 345ci v-8 .
Circle of Safety: Y
Location: louisiana

Re: Timing marks on crank pulley

Postby coppersmythe » Fri Feb 07, 2020 8:54 pm

i'm pretty sure you set the Idle timing at the first mark . dont take my advice alone . let the real experts come along . i've set mine with a timing light , and when idling up the rpm , the "mark " hardly moved . not sure what the second groove in the pully is for . coppersmythe..............

tst
10+ Years
10+ Years
Posts: 4370
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Timing marks on crank pulley

Postby tst » Fri Feb 07, 2020 9:59 pm

yes, 1st mark is tdc and 2nd is 16, make sure the advance weights are free, lubed and working in the distibutor

User avatar
ricky racer
10+ Years
10+ Years
Posts: 5296
Joined: Wed Sep 12, 2007 8:40 pm
Zip Code: 49120
Circle of Safety: Y
Location: Niles / Buchanan, Michigan

Re: Timing marks on crank pulley

Postby ricky racer » Fri Feb 07, 2020 10:28 pm

tst wrote:yes, 1st mark is tdc and 2nd is 16, make sure the advance weights are free, lubed and working in the distibutor

Isn't that backwards? The first should be 16 degrees before TDC and the second one should be TDC. Correct me if I'm wrong....
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19231
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Timing marks on crank pulley

Postby Eugene » Fri Feb 07, 2020 10:47 pm

ricky racer wrote:
tst wrote:yes, 1st mark is tdc and 2nd is 16, make sure the advance weights are free, lubed and working in the distibutor

Isn't that backwards? The first should be 16 degrees before TDC and the second one should be TDC. Correct me if I'm wrong....
Yup. First mark to line up with the pointer is 16 degrees before TDC.

Initial engine timing, static time at TDC. Get the engine started and running well. Then you can either set the timing using fast idle,16 degrees before TDC, or at low idle at Zero degrees TDC.

Once timing is set, test at both low and high idle.

Evident slop and wear. I prefer to set the low idle timing just a thin, very thin hair after TDC.
I have an excuse. CRS.

User avatar
Glen
5+ Years
5+ Years
Posts: 5014
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Timing marks on crank pulley

Postby Glen » Sat Feb 08, 2020 1:03 am

Hi,
Below is a page from the Cub service manual, showing the timing marks.
I would time it at the TDC mark, when the engine is running at low idle speed, 500 RPM.
Then as you speed the engine up, the timing should advance up to the 16 degree mark, when the engine is at high speed, which is 1800 RPM for Cubs up to serial number 192113. :)

http://www.farmallcub.info/manuals/gss- ... 001-43.jpg

They are talking about other things on the page, the pic has the info with the timing marks.

Dave F.
10+ Years
10+ Years
Posts: 505
Joined: Fri Feb 07, 2003 12:36 pm
Location: WV, Morgantown

Re: Timing marks on crank pulley

Postby Dave F. » Sat Feb 08, 2020 4:41 pm

I think the picture is wrong the 1st.mark as you crank to the pointer should be 16*btdc & the 2nd. mark should be tdc. the picture has it backwards. Dave F.

User avatar
tmays
10+ Years
10+ Years
Posts: 3048
Joined: Wed May 11, 2011 8:59 pm
Zip Code: 39154
Tractors Owned: 1948 Allis Chalmers G
1947 Cub
1952 Cub
1940 Farmall H
154 Cub LoBoy
Location: Vicksburg, MS

Re: Timing marks on crank pulley

Postby tmays » Sat Feb 08, 2020 4:59 pm

Dave F. wrote:I think the picture is wrong the 1st.mark as you crank to the pointer should be 16*btdc & the 2nd. mark should be tdc. the picture has it backwards. Dave F.

Pic is correct
Thomas

User avatar
Glen
5+ Years
5+ Years
Posts: 5014
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Timing marks on crank pulley

Postby Glen » Sat Feb 08, 2020 9:45 pm

Hi,
The engine turns clockwise as viewed from the front, looking at the tractor.

The number 2 mark in the manual pic gets to the pointer first, it is the advanced mark.

A Cub hand crank will only turn the engine one direction, clockwise, as viewed from the front. :)

coppersmythe
10+ Years
10+ Years
Posts: 1595
Joined: Thu Dec 24, 2009 9:19 am
Zip Code: 00000
Tractors Owned: '48 trimmed dash high crop cub , '78 3/4 cub , lo-boy/59 mower , '64 "galvanized" cub , cub-6 toolbar , sicklebar mowers , 54 blade , plow , mott mower , early belly mower . . international 1010 pickup with 345ci v-8 .
Circle of Safety: Y
Location: louisiana

Re: Timing marks on crank pulley

Postby coppersmythe » Sat Feb 08, 2020 11:20 pm

my '48 only has one "mark" . would that be top dead center or the advance ? i'm guessing i time to it first and then adjust by "ear". (magneto) coppersmythe.................

Jim Becker
Team Cub
Team Cub
Posts: 15873
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: Timing marks on crank pulley

Postby Jim Becker » Sat Feb 08, 2020 11:57 pm

coppersmythe wrote:my '48 only has one "mark" . would that be top dead center or the advance ? i'm guessing i time to it first and then adjust by "ear". (magneto) coppersmythe.................

If the pulley only has one mark,it is TDC.
No, do not time first to the mark then by ear. Time it to the mark then leave it there.

User avatar
Glen
5+ Years
5+ Years
Posts: 5014
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: Timing marks on crank pulley

Postby Glen » Sun Feb 09, 2020 2:50 am

Hi,
Below is a page from the 1949 Cub operator's manual, telling about timing a Cub with a magneto, if you need it. :)

http://farmallcub.com/rudi_cub/www.clea ... age-32.jpg

coppersmythe
10+ Years
10+ Years
Posts: 1595
Joined: Thu Dec 24, 2009 9:19 am
Zip Code: 00000
Tractors Owned: '48 trimmed dash high crop cub , '78 3/4 cub , lo-boy/59 mower , '64 "galvanized" cub , cub-6 toolbar , sicklebar mowers , 54 blade , plow , mott mower , early belly mower . . international 1010 pickup with 345ci v-8 .
Circle of Safety: Y
Location: louisiana

Re: Timing marks on crank pulley

Postby coppersmythe » Sun Feb 09, 2020 8:44 am

Glen wrote:Hi,
Below is a page from the 1949 Cub operator's manual, telling about timing a Cub with a magneto, if you need it. :)

http://farmallcub.com/rudi_cub/www.clea ... age-32.jpg
Jim Becker wrote:
coppersmythe wrote:my '48 only has one "mark" . would that be top dead center or the advance ? i'm guessing i time to it first and then adjust by "ear". (magneto) coppersmythe.................

If the pulley only has one mark,it is TDC.
No, do not time first to the mark then by ear. Time it to the mark then leave it there.
thank you Jim for the info, i did not know the early cubs only had one mark . after reading the magneto instructions , i'm pretty sure i must have the governor gear off by a tooth . i painted the correct teeth and was careful installing it . But , when i crank the motor over the mag impulse snaps about 1 1/2 " past the timing mark . thanks again , coppersmythe...............


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: tucker86 and 7 guests