Governor/Engine surging

Farmall Cub Forum -- 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.

Governor/Engine surging

Postby Richard1159 » Mon Apr 15, 2013 10:39 am

I have a 1956 Farmall Cub and after running for 5 minutes or so, the engine begins to surge. THis occurs at low and high speeds.
Is the governor sticking?
What controls the governor?
The sediment bowl is clear with fresh gas.
Richard1159
 
Posts: 1
Joined: Mon Apr 15, 2013 10:28 am
Zip Code: 77095

Re: Governor/Engine surging

Postby cub47 » Mon Apr 15, 2013 11:59 am

Has your carburetor been removed or adjusted recently?

First I would remove and clean the main jet on the lower side of your carburetor (I am assuming you have an IH style). Clean it out with smooth brass wire and blow out with compressed air.

Then I would follow the procedures laid out in the following links from the service manual courtesy of Rudi to make sure the carb is set to your governor.

http://www.cleancomputes.com/Cub/Blue%2 ... -02-18.jpg
http://www.cleancomputes.com/Cub/Blue%2 ... -02-19.jpg

You may also have to make adjustments to the bumper spring on the governor body itself, described here:

http://www.cleancomputes.com/Cub/Blue%2 ... -02-20.jpg

Locations of the bumper spring shown here:

http://www.cleancomputes.com/Cub/Blue%2 ... -02-19.jpg
cub47
501 Club
501 Club
 
Posts: 2198
Joined: Fri Dec 03, 2004 3:17 pm
Zip Code: 00000
Tractors Owned: Banned for multiple site rule violations.
Circle of Safety Award
Circle of Safety: Y

Re: Governor/Engine surging

Postby Eugene » Mon Apr 15, 2013 12:33 pm

My first thought is the fuel flow is partially restricted, almost but not fully keeping up with engine consumption. Could be external to the carburetor or internal. If the surging is fuel flow related it should be considerably more pronounced at higher rpms.

Next thought is the linkage adjustments indicated by Brian.
I have an excuse. CRS.
Eugene
Team Cub Mentor
Team Cub Mentor
 
Posts: 12121
Joined: Fri Jul 02, 2004 9:52 pm
Location: Mo. Linn
Zip Code: 65051
Circle of Safety Award
Circle of Safety: Y

Re: Governor/Engine surging

Postby gitractorman » Mon Apr 15, 2013 8:18 pm

Also, something easy to check is to see if the linkage from the governor to the carburetor is rubbing against the engine block, or if crud has built up in there causing it to rub. I've seen this on MANY cubs, even ones that have recently been re-painted and the carburetor re-installed. It's really easy to get that little rod bent towards the block and not even realize that it's rubbing. On the cub I did a few years ago, I think I bent the rod when I went to re-install it onto the carb. Did the exact same thing as you're describing. Saw where it was touching the block, grabbed it with both hands and gave it a little bend outward, problem solved!
1951 Farmall Cub, Cub Cadets 102, 104, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller
User avatar
gitractorman
501 Club
501 Club
 
Posts: 2023
Joined: Mon Oct 24, 2005 11:35 am
Location: Grand Island, NY
Zip Code: 14072
eBay ID: toysforjake
Tractors Owned: Lots of Cub Cadets!
1951 Farmall Cub
1977 IH Cub
1966 IH Cub
1965 IH Lo Boy
1949 Farmall Cub
Several IH 154 Lo Boys
1979 IH 184 Lo Boy
Simplicity 4416 Sovereign
Simplicity Conquest
Simplicity Legacy 4x4 Diesel
Circle of Safety Award
Circle of Safety: Y

Re: Governor/Engine surging

Postby Rudi » Tue Apr 16, 2013 9:46 am

Lubricate and make sure that all the linkages move freely - see breakdown :

Image
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship

User avatar
Rudi
Team Cub
Team Cub
 
Posts: 28425
Joined: Sun Feb 02, 2003 8:37 pm
Location: NB Dieppe, Canada
Zip Code: E1A7J3
eBay ID: ve9rhs
Skype Name: R.H. "Rudi" Saueracker, SSM
Tractors Owned: 1947 Cub "Granny"
1948 Cub "Ellie-Mae"
1951 Cub "Jethro"
Dad's Putt-Putt
IH 129 CC
Circle of Safety Award
Circle of Safety: Y
Twitter ID: Rudi Saueracker, SSM


Return to Farmall Cub

Who is online

Users browsing this forum: calcub, danovercash, jpcubs, pan60 and 6 guests