Connecting rod bearing?

garrettohio

Member

Equipment
Kubota L2900
Sep 16, 2023
89
2
8
Ohio
I checked on crank and everything.its no where to be found.im thinking someone worked on it before and forgot to put bearing back in.probably why piston was hitting head a little.the crank journals look good tho.
 

Oleracer

Well-known member

Equipment
B2150 Kubota LA 350 750 Woods S250 Bobcat 300x deere
Jul 18, 2024
222
258
63
CT
If no bearing ( no bearing in that cap and rod)you have some big problems if it ran. Yikes cant imagine how bad the crank is…. Thats now a complete rebuild out if tractor. Cap looks like bearing spun…
 

woodman55

Well-known member

Equipment
L6060HSTC, RTV 1100
May 15, 2022
937
733
93
canada
Try holding the cap back on the journal and see how much gap you have. With no bearing it should be almost a 1/4 inch. If only a bit, then the bearings are bonded to the crank.
 

Oleracer

Well-known member

Equipment
B2150 Kubota LA 350 750 Woods S250 Bobcat 300x deere
Jul 18, 2024
222
258
63
CT
Try holding the cap back on the journal and see how much gap you have. With no bearing it should be almost a 1/4 inch. If only a bit, then the bearings are bonded to the crank.
It this point it really wont matter. Motor has to come out or box it up and send it down the road. Its toast.. no fixing it in Tractor. Well maybe a patch job to run a 1/2 hour even thats doubtful
 

garrettohio

Member

Equipment
Kubota L2900
Sep 16, 2023
89
2
8
Ohio
It this point it really wont matter. Motor has to come out or box it up and send it down the road. Its toast.. no fixing it in Tractor. Well maybe a patch job to run a 1/2 hour even thats doubtful
That's just it.the journals have no grooves or anything.they look good.
 

Oleracer

Well-known member

Equipment
B2150 Kubota LA 350 750 Woods S250 Bobcat 300x deere
Jul 18, 2024
222
258
63
CT
That's just it.the journals have no grooves or anything.they look good.
Sorry wishful thinking. If it ran 1 min its done if no bearings. I saw this all the time with customers thinking it would be a cheap fix when a rod or main spun…. It aint its a complete rebuild. Unless the rod fairy came in the middle of the night and removed bearings. The rod cap clearly shows evidence of rod bearing tangs at one time and looks like it spun. No crosshatch marks on rod and cap were it was sized.
But i wish you the best. Get some professional help to look it over. Even if it costs you 100 bucks. Be money will spent and better than listening to somebody on the internet you have never meet .🤣 👍👍
 

Ktrim

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Equipment
B2400, lA352 loader,3pth quick hitch/z122r zero turn/restored 52 farmall super a
Dec 23, 2020
431
354
63
Nazareth Pa
Send it to joesmith he'll polish it right up.
 
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lugbolt

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ZG127S-54
Oct 15, 2015
5,248
1,923
113
Mid, South, USA
i find it hard to believe that the engine ran without bearings in the rod. It would have rattled so bad that nobody in their right mind would even bother trying to buy it, or continue running it. And, the crankshaft would be all chewed up in about 1 minute, and it would have low compression (piston won't go all the way to tdc without a rod bearing)

my guess is that the bearing is stuck on the journal. I've done this and it's not always obvious. That or they fell out while removing. Can you get a picture of the crank journal?
 
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Oleracer

Well-known member

Equipment
B2150 Kubota LA 350 750 Woods S250 Bobcat 300x deere
Jul 18, 2024
222
258
63
CT
i find it hard to believe that the engine ran without bearings in the rod. It would have rattled so bad that nobody in their right mind would even bother trying to buy it, or continue running it. And, the crankshaft would be all chewed up in about 1 minute, and it would have low compression (piston won't go all the way to tdc without a rod bearing)

my guess is that the bearing is stuck on the journal. I've done this and it's not always obvious. That or they fell out while removing. Can you get a picture of the crank journal?
Absolutely
 

whitetiger

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Kubota tech..BX2370, RCK60, B7100HST, RTV900 w plow, Ford 1100 FWA
Nov 20, 2011
2,942
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113
Kansas City, KS
Get out your micrometers and measure the crankpin diameter and the big end of the rod's inner size.
 
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GeoHorn

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Lifetime Member

Equipment
M4700DT, LA1002FEL, Ferguson5-8B Compactor-Roller, 10KDumpTrailer, RTV-X900
May 18, 2018
6,052
3,323
113
Texas
Are you sure you didn’t drop them down in the sump…? …or they’re stuck on the crank..?
There’s no way they were operated without bearings with no heavier damage evident.
 
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