Cub 3 No More Knock

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.
User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Cub 3 No More Knock

Postby pickerandsinger » Mon Jun 09, 2014 12:50 pm

Took the hood and tank off and put the aux tank on to give the "rod knocker" some diagnostic testing…I had taken the mower off and noticed the hydraulics were operating badly…I pressure washed the tractor and did the broomstick thing…Thinking I needed to address the hydraulics before it was torn down, I filled and bled the TC….Guess what, it took a substantial amount of Hyd fluid and the knock has gone away…The crankcase doesn't seem to be overfull so I guess I lucked out…Just a reminder that the TC being abnormally low will cause a pronounced engine knock…I kinda figured that and I guess I was right….for once…Thought I'd share that….Dave :thumbsup:

Now on to the clutch…..
In Memory of 58,286

User avatar
Hengy
10+ Years
10+ Years
501 Club
501 Club
Posts: 7147
Joined: Sat Feb 18, 2006 8:12 pm
Zip Code: 15101
eBay ID: lacrosseorgans
Skype Name: Mike.Hengelsberg
Tractors Owned: 1949 Cub "Merlin"
1955 Cub "Lewis"
Cub Trailer
A-60 Blade
Cub-22 Mower
193 Plow
Circle of Safety: Y
Location: PA, Allison Park (Am Hengelsberg)

Re: Cub 3 No More Knock

Postby Hengy » Mon Jun 09, 2014 1:48 pm

I have never heard of a low TC tank causing a knocking sound before. If it is that low, I would triple check the TC pump just to make sure. There has to be a leak someplace since the TC system is a closed loop system.
Mike (Happy as a Lark in Allison Park, PA)
Image Image

Check out my Restoration Thread (1955 Cub, Lewis)

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock

Postby pickerandsinger » Mon Jun 09, 2014 4:50 pm

What tipped me off was it started to squeal a little….The tractor has sit for many years…Last PO just bought it to sell, and before that it had been sitting for who knows how long..I just started it up noticed a knock, drove it across the field to my house and let it sit till yesterday when I put it in the shop..The listening stick told me the occasional chirp and the knock were coming from the front…I have no idea how long the tractor has sit unattended…But its a long time…And occasional parts have been canibalized….Doesn't seem to leak and is not going into the crankcase…Just didn't have any fluid in it..LOL…Anyhow the knock is gone from adding 3 Mickey Dees coffee cups of hydraulic fluid…( I think they were medium…LOL)
In Memory of 58,286

cub 3
5+ Years
5+ Years
Cub Star
Cub Star
Posts: 77
Joined: Sun May 29, 2011 10:31 pm
Zip Code: 27932
Tractors Owned: 53F
55 lo-boy
Location: N eastern, nc

Re: Cub 3 No More Knock

Postby cub 3 » Mon Jun 09, 2014 8:24 pm

Was that with cream an sugar! Keep on trucking!!

User avatar
Trent M
Cub Pro
Cub Pro
501 Club
501 Club
Posts: 3324
Joined: Wed Aug 09, 2006 6:21 pm
Zip Code: 62859
Circle of Safety: Y
Location: Illinois Southern

Re: Cub 3 No More Knock

Postby Trent M » Mon Jun 09, 2014 11:24 pm

Keep checking the level of the oil in the crankcase as you use the tractor, just to be sure the coffee you put in doesn't end up there. :wink:
Trent McPeak

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock

Postby pickerandsinger » Tue Jun 10, 2014 6:23 am

cub 3 wrote:Was that with cream an sugar! Keep on trucking!!
….Nah we drink cowboy coffee here…Black no sugar…LOL...
In Memory of 58,286

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock

Postby pickerandsinger » Tue Jun 10, 2014 6:26 am

Trent M wrote:Keep checking the level of the oil in the crankcase as you use the tractor, just to be sure the coffee you put in doesn't end up there. :wink:
…Will do, and I'm hoping it just wasn't coincidence they both happened at the same time and it starts knocking again... :mrgreen:
In Memory of 58,286

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock

Postby pickerandsinger » Tue Jun 10, 2014 3:03 pm

Hengy wrote:I have never heard of a low TC tank causing a knocking sound before. If it is that low, I would triple check the TC pump just to make sure. There has to be a leak someplace since the TC system is a closed loop system.
….Well we shall see Mike, I hear a faint knock at 3/4 throttle now and have to split it anyway so I may as well plastigauge things and check the engine out thoroughly and go from there…It'll be awhile….I'm in no hurry and got a lot to do this time of year…But its ready to split as I jot this down….
In Memory of 58,286

User avatar
Buzzard Wing
Cub Pro
Cub Pro
501 Club
501 Club
Posts: 10455
Joined: Mon Aug 09, 2004 10:14 pm
Zip Code: 02840
Location: RI, Newport

Re: Cub 3 No More Knock

Postby Buzzard Wing » Wed Jun 11, 2014 7:27 am

Could the knock have been from not having a good prime on the oil pump??
1971 Cub (Rufus) 1950 Cub (Cathy) 1965 Lo Boy Fast Hitch (Nameless III) 1970 Cub 1000 Loader & Fast Hitch (Lee)

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock

Postby pickerandsinger » Wed Jun 11, 2014 5:42 pm

Buzzard Wing wrote:Could the knock have been from not having a good prime on the oil pump??
Good thought…Never gave that a thought…I'm going to drop the pan tomorrow and check the rod bearings etc before I split it to do a clutch….But you know that does sound like a reasonable explanation…When I was preparing it for splitting I noticed the oil filter outside top was full of oil.(gasket leaking I presume)….It might have just gotten primed….still a subdued knock…You can't hear it at idle…(or I can't LOL)….May as well check it out well as long as its down…Ed suggested I lap the valves while its down also…I think he wants me to break a head bolt…. :lol:
In Memory of 58,286

User avatar
pickerandsinger
501 Club
501 Club
Posts: 1182
Joined: Thu Oct 18, 2012 3:23 pm
Zip Code: 13143
Tractors Owned: 1957 Cub Low Boy w/ Danco c3 (Cubby)
1953 Cub w/ sprayer and 54A blade (Chompers)
1954 Cub w/fast hitch (Ira)
1948 Cub ( Papa Paul)
Mutt mix Cub (BattleAxe)
1950 Farmall Cub (basket case demo)
1950 Ferguson TO20 w/ loader (John Henry)
1951 Ferguson TEA 20 (parts)( Uncle Rusty)
F/H Disc Harrow for cub L-38
C-22 Sickle Bar Mower
IH C2 and C3 mower
Universal tool attachment with disc hillers..Rear cultivators (various tips)
Henderson Loader
York Rake for Cub home made
Single bottom Plow for Cub F194
Gravely 5660 12 hp/ w snoblower.rototiller,bush hog
Circle of Safety: Y

Re: Cub 3 No More Knock (ammended)

Postby pickerandsinger » Sat Jun 14, 2014 4:42 am

Number 4 rod bearing was the culprit….Nix the hydraulic system comment.. :lol: ….The bearing had moved slightly thus tightening up at the same time I filled the hyd fluid…Thus the screech I heard…And the knock subsided somewhat…( Another Irish guess)... :mrgreen:
In Memory of 58,286


Return to “Farmall Cub”

Who is online

Users browsing this forum: mva1958 and 7 guests