ZTU rod bearings

[Alexander1997]

I finished rings, rebuilt cylinder blocks and valves on the ZTU, so I’m down to rod bearings.
The crank journals checked at 2.605 and according to what I find in the manual standard is 2.625, so my crank has been turned to .020 under.
Does anyone have know where to look for these rod bearings since they’re non standard?

 

[Dennis P]

Welters in Verona, Mo. 4174986496

 

[Duner Wi]

Sealed Power CB270 .020 or CB-270 .020 I think is # you are looking for. That might not be current Sealed Power number.

 

[JOCCO]

I got my R ones from welters I believe. They were standard though. I believe early Z 1941-47 take same as r as it is a 185 motor.

 

[Duner Wi]

These #s are Federal Mogul I believe.
9785SB .020 Rod Bearing for ZTU

 

[Dennis P]

If I remember correctly, the 206 rod bearings are what you’ll get now for R and Z. I think they are a little narrower than the EE and RE engines but work fine.

 

[Alexander1997]

These #s are Federal Mogul I believe.
9785SB .020 Rod Bearing for ZTU

Wow! 9785SB is what came out of my tractor. So that is the old number for a .020 rod bearing?? Not standard?
I feel dumb, when I first took them out my novice assumption was the “SB” stood for standard bearing so I made sure and got ahold of a caliper to test. Thanks a bunch!

 

[Alexander1997]

I got my R ones from welters I believe. They were standard though. I believe early Z 1941-47 take same as r as it is a 185 motor.

Much appreciated. I’ll probably call Welter’s Monday. Always been real satisfied with them

 

[Alexander1997]

Sealed Power CB270 .020 or CB-270 .020 I think is # you are looking for. That might not be current Sealed Power number.

Thank you!

Wow! 9785SB is what came out of my tractor. So that is the old number for a .020 rod bearing?? Not standard?
I feel dumb, when I first took them out my novice assumption was the “SB” stood for standard bearing so I made sure and got ahold of a caliper to test. Thanks a bunch!

And I guess I was stumped here because mine just had the 9785 SB, no .020 anywhere. But I’ve read those things were sometimes stamped in ink so guess it wore off. Thanks again

 

[molinegb]

Thank you!

And I guess I was stumped here because mine just had the 9785 SB, no .020 anywhere. But I’ve read those things were sometimes stamped in ink so guess it wore off. Thanks again

If you don't see .20 or date code you will have to measure. Going by that number not going to help.

 

[Alexander1997]

If you don't see .20 or date code you will have to measure. Going by that number not going to help.

The rod bearings that came out had no size, which had made me think they were standard. But two different people measured the journals with calipers and the journals show the crank has been turned. I guess it's possible the number wore off?

 

[Farmalldude45]

The rod bearings that came out had no size, which had made me think they were standard. But two different people measured the journals with calipers and the journals show the crank has been turned. I guess it's possible the number wore off?

It may be so simple as every bearing size has it's own unique part number. Thus, no need to stamp undersize. This is what International Harvestor did on their letter series tractors. Suggest you check parts manual to verify.

 

[Duner Wi]

It may be so simple as every bearing size has it's own unique part number. Thus, no need to stamp undersize. This is what International Harvestor did on their letter series tractors. Suggest you check parts manual to verify.

Moline did as you suggest. BUT aftermarket bearings that I am familiar with had one part number and suffixed the size if .010,.020, .030 etc.

 

[molinegb]

I highly doubt crank was cut. Lots of those cranks around. Not an easy job to remove shave and replace. Most of the rod bearings MM used do not cross to anything.

 

[Alexander1997]

Moline did as you suggest. BUT aftermarket bearings that I am familiar with had one part number and suffixed the size if .010,.020, .030 etc.

Yep, that's where I get confused but chalk it up to the number must've worn off. Bearing is stamped: Federal Mogul 80 9785SB
Nothing else but the crank doesn't' check out at 2.625 which the shop manual says is standard. All help here has been and is appreciated

 

[Duner Wi]

Yep, that's where I get confused but chalk it up to the number must've worn off. Bearing is stamped: Federal Mogul 80 9785SB
Nothing else but the crank doesn't' check out at 2.625 which the shop manual says is standard. All help here has been and is appreciated

My guess is who ever installed the 9785SB bearings you removed might have wiped the bearing with lacquer thinner and the printed ink .020 was removed. It would take a very poor operator or caliper that couldn't tell the difference between standard and .020. I always wipe new bearings with lacquer thinner and lint free rag or paper towel. Oil them just prior to installation but don't touch bearing surface with fingers.

 

[Alexander1997]

My guess is who ever installed the 9785SB bearings you removed might have wiped the bearing with lacquer thinner and the printed ink .020 was removed. It would take a very poor operator or caliper that couldn't tell the difference between standard and .020. I always wipe new bearings with lacquer thinner and lint free rag or paper towel. Oil them just prior to installation but don't touch bearing surface with fingers.

It was checked with two different calipers. Most consistently getting 2.605, but also got 2.601, 2.602, all around that ball park. I like to be on the safe side of things, so I might round up a micrometer first, or certainly I'll plastigauge with 0.020 bearings before the engine is ever fired up.
The shell off the rod in the tractor checked at 80-thousandths and the standard bearings I compared with checked on the calipers at
70-thousandths, so I'm pretty certain it's 0.020 bearings but I'll verify with a micrometer and plastigauge before I do any damage. Thanks for all the help