This site uses cookies to maintain login information on FarmallCub.Com. Click the X in the banner upper right corner to close this notice. For more information on our privacy policy, visit this link: Privacy Policy
NEW REGISTERED MEMBERS: Be sure to check your SPAM/JUNK folders for the activation email.
Cub Will not Start
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.
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.
-
- 10+ Years
- Posts: 76
- Joined: Thu Jun 23, 2011 2:32 pm
- Zip Code: 07849
Cub Will not Start
Hi everyone,
I have not been able to get my 1948 Cub started in some time now, so I took the time to really look it over and try and diagnose the issue. For starters, the last time i was able to get it running i had to run it on full choke the entire time. So being that i did not know when it was done last, I went and installed a basic carb kit from Steiner. I made sure all went back together nice and correctly. I checked for fuel flow and it seemed to be correct. I then checked for spark. All 4 cylinders had a good solid blue spark at the plug. When I go to start it I usually get one solid pop of the engine, just enough to disengage the starter and the engine stops. It will do this over and over again and never completely turn over. I checked and adjusted the needle valve on the carb as much as I could, still with no improvement. I am not sure where to go next with all this, I am thinking I should do a compression test and see what that tells me, but other than that I am not sure what to do. Any ideas or suggestions would be much appreciated.
Thanks,
A.J.
I have not been able to get my 1948 Cub started in some time now, so I took the time to really look it over and try and diagnose the issue. For starters, the last time i was able to get it running i had to run it on full choke the entire time. So being that i did not know when it was done last, I went and installed a basic carb kit from Steiner. I made sure all went back together nice and correctly. I checked for fuel flow and it seemed to be correct. I then checked for spark. All 4 cylinders had a good solid blue spark at the plug. When I go to start it I usually get one solid pop of the engine, just enough to disengage the starter and the engine stops. It will do this over and over again and never completely turn over. I checked and adjusted the needle valve on the carb as much as I could, still with no improvement. I am not sure where to go next with all this, I am thinking I should do a compression test and see what that tells me, but other than that I am not sure what to do. Any ideas or suggestions would be much appreciated.
Thanks,
A.J.
-
- 10+ Years
- Posts: 5206
- Joined: Tue Jan 12, 2010 2:08 pm
- Zip Code: 12514
- Circle of Safety: Y
Re: Cub Will not Start
A compression test is a good place to start, It can tell you a lot
Tim
Tim
- challenger
- 10+ Years
- Posts: 1087
- Joined: Sun Apr 18, 2010 6:22 am
- Zip Code: 21742
- Tractors Owned: 1955 F Cub (2)
1952 F Cub
1948 F Cub
2155 JD
216 JD - Circle of Safety: Y
- Location: Hagerstown MD
Re: Cub Will not Start
In addition to compression testing, I would static time the engine.
- clodhopper
- 10+ Years
- Posts: 807
- Joined: Sat May 07, 2011 8:20 pm
- Zip Code: 27526
- Tractors Owned: 1950 Cub Demo
1978 Cub Cadet 1650
cub 193 plow
cub 174 planter
cub sidedresser
cub 144 cultivator
cadet 50C deck - Circle of Safety: Y
Re: Cub Will not Start
challenger wrote:In addition to compression testing, I would static time the engine.
-
- 10+ Years
- Posts: 28
- Joined: Sat Jul 07, 2012 5:59 pm
- Zip Code: 17040
- Tractors Owned: 1947 farmall H
1951 farmall CUB - Location: Landisburg, Pa
Re: Cub Will not Start
after timing and a compression test try spraying a lubricant in each cylinder. I had the same problem only because all the cylinders where dry after that the engine starts every time.
- FCUBMAN
- 10+ Years
- Posts: 442
- Joined: Thu Dec 28, 2006 12:35 am
- Zip Code: 00000
- Tractors Owned: 2 Cubs
1 Simplicity
1 Craftsman
1 Farmall 130 with loader
1 Tiger - Location: CT, Northern
Re: Cub Will not Start
If the above steps don't work, try a new condenser. That was my problem - one pop would kick the starter out, time after time.
"Remember, I'm pulling for you - we're all in this together!"
Quoted from Red Green of Possum Lodge
When you get older, lack of pep is often mistaken for patience.
(1956 and 1948 Cubs)
Quoted from Red Green of Possum Lodge
When you get older, lack of pep is often mistaken for patience.
(1956 and 1948 Cubs)
-
- 10+ Years
- Posts: 13
- Joined: Fri Sep 07, 2012 7:52 am
- Zip Code: 12846
Re: Cub Will not Start
I don't claim to know what I'm talking about but; try changing your coil. Just because you have spark when vied @ the plugs and the point doesn't mean that spark isn't going away when you try to start and get a pop. When my coil went bad I could run the tractor for 10-20 min and it shut off. Eventually I couldn't start the tractor (just get a pop and still show spark @ plugs). Coils are cheap $25-$35 from various web sites. I hope that I've been helpful as others have helped me on this site.
- Lurker Carl
- Cub Pro
- Posts: 3970
- Joined: Mon Feb 03, 2003 9:54 am
- Zip Code: 16685
- Circle of Safety: Y
- Location: PA, Todd
Re: Cub Will not Start
Do not replace what may be perfectly good parts in haphazard fashion, perform a tune up instead. Engines have multiple components that require routine adjustment and tweaking. Perform the ignition and timing checks first, check the compression in each cylinder as you're examining spark plugs, then measure and adjust valve lash and deal with the fuel system and carburetor adjustments last.
Something is restricting fuel flow if any choke is required after the engine runs for a few minutes. My guess is the entire fuel system needs a good cleaning. Even if the culprit resides within the carburetor, chances are it came from the fuel tank and more goobers are in there.
Something is restricting fuel flow if any choke is required after the engine runs for a few minutes. My guess is the entire fuel system needs a good cleaning. Even if the culprit resides within the carburetor, chances are it came from the fuel tank and more goobers are in there.
"Chance favors the prepared mind."
- Louis Pasteur
"In character, in manners, in style, in all things, the supreme excellence is simplicity."
- Henry Wadsworth Longfellow
- Louis Pasteur
"In character, in manners, in style, in all things, the supreme excellence is simplicity."
- Henry Wadsworth Longfellow
-
- 10+ Years
- Posts: 99
- Joined: Tue Feb 21, 2012 11:02 pm
- Zip Code: 19520
- Tractors Owned: 1948 Farmall Cub
2007 Cub Cadet
Re: Cub Will not Start
tst wrote:A compression test is a good place to start, It can tell you a lot
Tim
I had a difference in one cylinder (#4) from the others of about 25 psi. It backfired a little through the carb and had very little power, and of course was very hard to start. I had two issues - bad rings and a warped head. Not sure how common that is.
-
- 10+ Years
- Posts: 76
- Joined: Thu Jun 23, 2011 2:32 pm
- Zip Code: 07849
Re: Cub Will not Start
Thank you all for the replies. I borrowed a compression tester from and a friend and will be working on it soon. I will also check all the vital signs you guys have mentioned and be sure to return back with the results.
A.J.
A.J.
-
- 10+ Years
- Posts: 76
- Joined: Thu Jun 23, 2011 2:32 pm
- Zip Code: 07849
Re: Cub Will not Start
worked on the cub today, retimed the engine. Did not have time to check compression yet but found another issue. While attemping to fire it up noticed fuel leaking from around the main metering jet. After looking at it found that the threads for ther main metering jet are striped out. My question is, can this be retapped and fixed. What are my options to fix this. If nothing else this cub is helping more learn some lessons the hard way. HA.
Thanks,
A.J.
Thanks,
A.J.
- Rudi
- Cub Pro
- Posts: 28706
- Joined: Sun Feb 02, 2003 8:37 pm
- Zip Code: E1A7J3
- Skype Name: R.H. "Rudi" Saueracker, SSM
- Tractors Owned: 1947 Cub "Granny"
1948 Cub "Ellie-Mae"
1968 Cub Lo-Boy
Dad's Putt-Putt
IH 129 CC
McCormick 100 Manure Spreader
McCormick 100-H Manure Spreader
Post Hole Digger
M-H #1 Potato Digger - Circle of Safety: Y
- Twitter ID: Rudi Saueracker, SSM
- Location: NB Dieppe, Canada
- Contact:
Re: Cub Will not Start
A.J.:
Yes you can fix the threads - easiest way is a helicoil. This thread might be useful: How To Decide Which Taps Are Needed For My 3/4" IH Carb
So you need to find that set on or locally.
Helicoil 5528-4 - Thread Repair Kit 1/4" - 28
Yes you can fix the threads - easiest way is a helicoil. This thread might be useful: How To Decide Which Taps Are Needed For My 3/4" IH Carb
1/4-28 NF for the Main Metering Jet Part # 354 192 R91
So you need to find that set on or locally.
Helicoil 5528-4 - Thread Repair Kit 1/4" - 28
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
-
- 10+ Years
- Posts: 76
- Joined: Thu Jun 23, 2011 2:32 pm
- Zip Code: 07849
Re: Cub Will not Start
awesome, thank you
-
- Team Cub
- Posts: 11851
- Joined: Tue May 25, 2004 8:02 pm
- Zip Code: 80501
- Tractors Owned: Cubs, MH Pony, Shaw, Allis G, 1934 Silver King, JD LA and LI, Gibson D, David Bradley Tri-Trac
- Circle of Safety: Y
- Location: CO, Longmont
Re: Cub Will not Start
Does your main jet have the fiber gasket on it? I'd try and chase the threads first before inserting the helicoil. If you have to helicoil, you also have to drill a larger hole in the side of the carb where the main jet inserts in order to insert the larger drill for the helicoil.
Bob
Edit: that helicoil takes a G size drill (.26")
Bob
Edit: that helicoil takes a G size drill (.26")
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
-Albert Einstein
-
- 10+ Years
- Posts: 38
- Joined: Fri Apr 25, 2003 7:03 am
- Zip Code: 27587
- Tractors Owned: 1949 Cub
1969 CC125
1970 Gravely CI - Circle of Safety: Y
- Location: Wake Forest NC
Re: Cub Will not Start
Regarding the starter kicking out just as it catches - my '49 with magneto ignition will sometimes do the same thing. I have actually found that it will start easier on the crank for the first start of the day. I have wonderered if the impulse in the mag will make a stronger spark if cranked over slow vs. the higher revolutions of the starter. If yours is mag equipped it may be worth a try to see how it will do on the crank once your fuel issues are resolved.
FWIW,
Chad
FWIW,
Chad
Who is online
Users browsing this forum: No registered users and 47 guests