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#1 connecting rod bearing

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Kenk
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Zip Code: V0X1C2
Tractors Owned: 1943 Farmall A
1948 Farmall Cub
1999 New Holland TN55D
2008 JD 3720

#1 connecting rod bearing

Postby Kenk » Sun Jan 03, 2021 6:26 pm

Finally got time to pull the 48 cub engine. #1 connecting rod bearing is toast. This pic is of the #4 bearing. Is it standard size or 20 over? Thanks for your help.
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DA48AFA5-22AB-4569-9CAA-A5A9068B8143.jpeg
Ken K
Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
1962 Farmall 140 Hi-Clear 17059 JHC
1999 New Holland TN55D
2008 JD 3720
Our tractors work for a living!
The Cawston Market Farmer

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k hutchins
10+ Years
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Joined: Tue Mar 27, 2012 5:48 pm
Zip Code: 48843
Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
Woods 59 C3
Cub 144 cultivator
Cub 22 mower
Cub 172 one row planter
Original manuals for all the above
Circle of Safety: Y

Re: #1 connecting rod bearing

Postby k hutchins » Sun Jan 03, 2021 6:49 pm

Ixm no expert, but l just replaced all of my bearings and they were all stamped STD. I would guess it is an oversized.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

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Glen
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
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Location: Wa.

Re: #1 connecting rod bearing

Postby Glen » Sun Jan 03, 2021 7:05 pm

Hi,
The .020 on the bearing means it is .020" undersize.
Below is a page from the Cub parts manual showing the bearings. Your part number is almost the same as it shows for a .020" undersize bearing, except they added another 1 at the end of the number.
I don't know what the change was, it could be because the parts manual is newer than the bearings you have, but I don't know.

There are 2 different part number bearing for each size because IH changed the connecting rods in newer engines.

http://www.farmallcub.info/manuals/cub_ ... 012-04.jpg

I would measure the crankshaft while it is apart, and check for wear. :)

Nelson 634
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1952 100
1960 460 Utility
Location: Central Va.

Re: #1 connecting rod bearing

Postby Nelson 634 » Sun Jan 03, 2021 8:28 pm

Your both saying the same thing. It's a glass half full vs. half empty thing. The bearing is made .020 thicker for a crank which .020 worn away. Glen is calling it a bearing for a .020 under sized crank. The bearing is .020 over in size.
Walter

Jim Becker
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Re: #1 connecting rod bearing

Postby Jim Becker » Sun Jan 03, 2021 9:26 pm

Standard terminology is to call that undersized. The crankshaft has been reground to .020 smaller than standard. The hole through the middle of the bearing insert is also .020 undersize. By the way, having #4 .020 undersize is no guarantee that #1 is .020 undersize. Check each rod journal separately.

Kenk
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Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V0X1C2
Tractors Owned: 1943 Farmall A
1948 Farmall Cub
1999 New Holland TN55D
2008 JD 3720

Re: #1 connecting rod bearing

Postby Kenk » Sun Jan 03, 2021 9:38 pm

Thanks for the replies. I will check all the Bearings and measure. Damage on #1 could be an issue. Thank you again.
Ken K
Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
1962 Farmall 140 Hi-Clear 17059 JHC
1999 New Holland TN55D
2008 JD 3720
Our tractors work for a living!
The Cawston Market Farmer

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Glen
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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: #1 connecting rod bearing

Postby Glen » Mon Jan 04, 2021 12:57 am

Hi,
Nelson 634, I wasn't trying to disagree with k hutchins about what to call the bearing, if that's what you thought, I was simply using the term I normally use, to tell Kenk that it isn't a standard size bearing.

I know people on here use either term for the bearings.
The Cub parts manual calls them U/S after each listing for the undersize bearings, meaning undersize, I suppose.

Magnum
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Re: #1 connecting rod bearing

Postby Magnum » Mon Jan 04, 2021 4:49 pm

So this may be a silly question , but here it is anyways , what tipped you off to do the inspection of the bearings ? Knocking ? Low oil psi ? All the above ?

Jim Becker
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Re: #1 connecting rod bearing

Postby Jim Becker » Mon Jan 04, 2021 8:15 pm

Magnum wrote:So this may be a silly question , but here it is anyways , what tipped you off to do the inspection of the bearings ? Knocking ? Low oil psi ? All the above ?

This is kind of a part two to a story from before you joined.
viewtopic.php?f=1&t=108333&p=859473

Magnum
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Re: #1 connecting rod bearing

Postby Magnum » Mon Jan 04, 2021 8:41 pm

Ok thanks all caught up now

Eugene
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Re: #1 connecting rod bearing

Postby Eugene » Mon Jan 04, 2021 8:49 pm

Jim Becker wrote:
Magnum wrote:So this may be a silly question , but here it is anyways , what tipped you off to do the inspection of the bearings ? Knocking ? Low oil psi ? All the above ?

This is kind of a part two to a story from before you joined.
http://www.farmallcub.com/phpBB2/viewto ... 3&p=859473
And a lack of good compression and/or poor engine performance. I think most would be found during the inspection in preparation for an engine overhaul.
I have an excuse. CRS.

tst
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Re: #1 connecting rod bearing

Postby tst » Tue Jan 05, 2021 8:16 am

low oil pressure is more likely main bearings, knock is most likely rod bearing

Kenk
5+ Years
5+ Years
Posts: 35
Joined: Sun Oct 16, 2016 6:26 pm
Zip Code: V0X1C2
Tractors Owned: 1943 Farmall A
1948 Farmall Cub
1999 New Holland TN55D
2008 JD 3720

Re: #1 connecting rod bearing

Postby Kenk » Sun Jan 10, 2021 12:40 am

Sorry for the slow reply. Weather here is nice so building an equipment shelter.
Main bearings look great. Rod bearings are good but number 1 is toast. I will not be able to remove the crank as the pully is welded on. Guess they needed to make sure it stayed in place. Go figure. Have started to clean up the journal to see if it’s possible to use it. Otherwise I will cut it up and get a new one. Thanks for the replies.
Ken K
Cawston BC Canada
1948 FCUB #56087
1943 Farmall A FAA78723
1962 Farmall 140 Hi-Clear 17059 JHC
1999 New Holland TN55D
2008 JD 3720
Our tractors work for a living!
The Cawston Market Farmer

k hutchins
10+ Years
10+ Years
Posts: 675
Joined: Tue Mar 27, 2012 5:48 pm
Zip Code: 48843
Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
Woods 59 C3
Cub 144 cultivator
Cub 22 mower
Cub 172 one row planter
Original manuals for all the above
Circle of Safety: Y

Re: #1 connecting rod bearing

Postby k hutchins » Sun Jan 10, 2021 9:02 am

I just replaced all 3 journal bearings, and all 4 piston arm bearings and never removed the crankshaft.
I Plastiguaged the old bearings to see where l stood, and found that none were that far out of tollerance. So l replaced with new STD bearings. For the top half of the journal bearings, l was able to "drive" them out using a piece of strapping. Then just slipped the new one in lightly tapping if it was tight.
I was working with the block upside down on a stand, it might be more difficult working from underneath.

Good luck
Why is there never enough time to do the job right, but always enough time to do it over. :?:

tst
10+ Years
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Posts: 5189
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: #1 connecting rod bearing

Postby tst » Sun Jan 10, 2021 10:03 am

An easy trick to replace bearings in the motor while you are doing it from underneath it, use a screw or nail, low profile head, put it in the oil hole of the crankshaft, turn crank and it will walk the bearing right out, same to install once it is started


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