Crankshaft Bearing Mark Question

[ERNRAM]

I am in the process of rebuilding a 2F out of a 86 FJ60. The machine shop inspected the journals and said they are good to go back to STD. The problem is the STD set is no longer available, but each of the 4 bearings are, but they seem to have a "Mark 1-5" on the Toyota ordering form.

First question is what does the mark mean?
Second question is I assume that I need to replace with all the same mark?

Thanks
Ernie

 

[ERNRAM]

@FJ40Jim

Hi Jim,

Any guidance you could provide would be very much appreciated.

Thanks
Ernie

 

[ERNRAM]

Above is the example of the Mark 1-5 options for journal #2

 

[FJ40Jim]

The marks are stamped on the oil pan rail, 4 for mains, 6 for rods.

 

[ERNRAM]

Jim,

Ok, I think I understand, , but just want to double check.

Your saying that there is a stamp on the oil pan rail next to each of the 4 crankshaft bearing caps that then indicate which of the 5 avaliable Toyota options to select for each journal. Hope I summarized that correctly.

Why would Toyota have 5 different bearing options for the same crank journal? Seems a bit crazy.

Thanks
Ernie

 

[ERNRAM]

Jim,

The numbers are 7767
And
221222

I don't know if that gets me any closer to figuring out what I need to order for the 4 main journals.

Is there a decoder tool for this?

Thanks
Ernie

 

[ERNRAM]

This is the one time it absolutely socks that the crank is at STD.

 

[ERNRAM]

Apparently I think you add the block bore number to the crank journal number to get the right bearing you need.

This is for a different type of toyota engine

 

[ERNRAM]

Don't know if this is any help, but the crank bearing sets for your year are still available in 0.25 and 0.50 U/S.

View attachment 1338491

View attachment 1338492

Hi output,

Where is this website?

Thanks
Ernie

 

[FJ40Jim]

Sorry, my mistake. The 6 numbers are the cylinder bore size classes, not the rod journals. IDK if they bothered with rod size class.

4 numbers are main journal size class. They are stamped in a cluster on the pan rail, not next to each main cap.

 

[ERNRAM]

Sorry, my mistake. The 6 numbers are the cylinder bore size classes, not the rod journals. IDK if they bothered with rod size class.

4 numbers are main journal size class. They are stamped in a cluster on the pan rail, not next to each main cap.

Jim,

I think you right.....he toyota catalog does not indicate unique rod bearings. so back to the crank numbers. are they stamped on the ccounterweight?

Thanks so much. I love learning this small detail.

Thanks
Ernie

 

[FJ40Jim]

Main journal size class numbers are the 4 digits stamped in a group on the pan rail.

 

[ERNRAM]

 

[ERNRAM]

Basically looks like Toyota bins their main bearings in increments of one ten thousands of an inch
0.0001"

Here is an example I found

 

[ERNRAM]

After market bearings are effectively thinner than Mark 1, thus it is like an Type O universal blood donor. Being universal means it's not optimized for the larger block main journal bore.

It's cool to learn new things.


It now makes sense why these engines have such good reliability . They are basically blueprinted from the factor.........40 years ago

 

[88red]

My block is stamped 7668 and the crank is 4554. That gives me a t3,t1,t1,t4 front to back according to the fsm. I'm not sure how that translates to ordering from Toyota. Mark1 no.3, Mark2 no.1, etc...?

 

[FJ40Jim]

Is the crank still the same size as the day it was built?

 

[ERNRAM]

Is the crank still the same size as the day it was built?

Yes....he machinist says it's exactally at nominal dimension

 

[ERNRAM]

My block is stamped 7668 and the crank is 4554. That gives me a t3,t1,t1,t4 front to back according to the fsm. I'm not sure how that translates to ordering from Toyota. Mark1 no.3, Mark2 no.1, etc...?

Hi Red,

Can you take a picture of where you found the 4554
I assume it's one number per location.

My machinest is have a hard time finding the locations on the crankshaft.

Thanks
Ernie

 

[88red]

I t

Hi Red,

Can you take a picture of where you found the 4554
I assume it's one number per location.

My machinest is have a hard time finding the locations on the crankshaft.

Thanks
Ernie

I tried taking a picture. The marks are too faint. They are on the center balance section of the crank right above the oil pump. You may need to rotate until it faces downward(away from the block). I needed a flashlight with raking light to read all four numbers.