Rod bearing and main bearing having differences.

[cvtroger]

After my motor tear down, I was told I needed specific parts.

1995 LE S/C

13041-75022 - Rod Bearings all "Mark 5"

For the main bearings, #1 and #5 are 11701, while #2-#4 are 11071, just a difference in size.


Is this common?

[pdgizwiz]

Toyota grades bearings to allow tighter control over clearances than would otherwise be practical given the outcome of conventional machining tolerances. On the Previa they nail the main and rod journals on the crankshaft, but fit bearing shells to fit to the block and rods based on actual measurements of the bores achieved.
The first and last of the five main bearings are a little longer (wider) than the other three. Toyota calls these "No. 2" and the other three "No. 1".The grades for the five block bearings are stamped on the block:
http://www.gizmowizard.com/Toyota/2TZ-FE_Rebuild/main-caps_2TZ-FE.jpg


http://www.gizmowizard.com/Toyota/2TZ-FE_Rebuild/main-brg-codes-on-2TZ-FE-block.jpg


The rod grading numbers are etched on to the side of the rods.
The mark "2" is shown clearly here on the rod itself:
http://www.gizmowizard.com/Toyota/2TZ-FE_Rebuild/rod-grade-mark-2TZ-FE.jpg

The three dots here are my own code, added with a center punch, to indicate that this is rod number three of the four.

The bearing shells have ink-stamped numbers which are very hard to see, much less photograph, but here's an attempt:
http://www.gizmowizard.com/Toyota/2TZ-FE_Rebuild/Rod-shell-grade-mark_2TZ-FE.jpg

I've cheated here, and outlined the "2" on the image. You can just barely read the inked "2".


**It looks like for the S/C engines the rod shell grades go from 1 to 6. On the N/A engines they just go to 3. I guess they opened up their bore tolerance and started making thicker shells?**

**Correction! Up through 93/07, the rod shells are graded 1 through 3, and afterwards from 4 through 6. It looks like they were getting some changes in place for the S/C engine, but I'm not sure.

In other Toyota Engines I've worked on both the crank and block were graded. The grade numbers had to be added to arrive at the shell number needed. But tolerances are controlled to within a few microns. It sounds like your shop knows what they're doing. If you just bought a generic set of 'std" bearings from fleabay you might well wind up with greater clearances than the shells being replaced.

[cvtroger]

Thanks for the great information. When it comes to getting stuff of ebay, I will NEVER get parts that depend on my vehicle to run. I've seen way too many functionally dependent components go out prematurely because they are knock offs (water pump, fuel pump...). I did get my brake rotors off a seller that I have been using since 2002.

I ordered the bearing set through 1sttoyotaparts.com and since it was a big order, it was good for shipping. With that said, I was on the phone this morning with one of the part reps and he was telling me that Toyota doesnt make the bearings set marked "5", so he cannot get them. He also tell me this:

"That part number (13041-75020-05) is for the individual bearings, you ordered the whole set which all come in one size and are used if the crankshaft has been machined to use them. Many times three of the bearings will be one size and the fourth will be different, but not always. If you're having the crankshaft machined you should be able to use the set you ordered, if the crankshaft is as it was new than you'll need to order them individually by the numbers. The bummer is that your VIN doesn't tell me what sizes you may need."

So I will have to get my crankshaft machined to match those bearings. I do like the shop that is doing the work, as they are Toyota specialists and have done great work on my other car. But I saved over $800 just by getting my own parts.

Thank you for the information. I have been away from car stuff too long and I need to get back into it.

[pdgizwiz]

Hmmmm......

Pesonally, I think it's a shame to machine a crank if it is still in spec. Maybe yours is worn.. I don't know.

I refreshed a low-miles 5MGE recently and sourced individual bearings to match the originals from http://www.toyotapartszone.com/
They don't show the exploded diagrams any more, but I can still see them at http://www.toyomotorparts.com/
They list the whole ball-o-wax here: http://www.toyomotorparts.com/components/toyota-1995-previa_crankshaft-piston-13-01-11338.html

Click "more info" and then "view" for the diagram

It appears to me that your rod bearings are 13041-75022-05 $12 each, give or take a few cents.

Individual crank bearings for the end ("No. 2") positions are 11701-75022-0x Where x is the grade code
Individual crank bearings for the center three (No. 1") positions are 11071-75022-0x.

You should check all these numbers yourself, of course.

If you're a hammer, everything looks like a nail. If you're a machine shop, every piece of metal needs to have some removed.

[cvtroger]

Great perspective. I will go with that. Yup, my crankshaft is good and inspect, so I might have to go with what you posted.

Let me get cracking on these parts.

[TheMAN]

DO NOT turn down a crankshaft unless absolutely necessary
when you make the journals smaller, you weaken the crank

for a stock engine and especially for an over engineered engine like the 2TZ, will it matter? not really, but why not just leave it tough as nails because it was that way to begin with?

[cvtroger]

DO NOT turn down a crankshaft unless absolutely necessary
when you make the journals smaller, you weaken the crank

for a stock engine and especially for an over engineered engine like the 2TZ, will it matter? not really, but why not just leave it tough as nails because it was that way to begin with?

After this information, I decided to NOT have any machining done on the crankshaft. I followed the link that pdgizwiz provided and ordered my parts from them. When I was talking to a 1sttoyotaparts rep, he said they didnt make the grade 5 anymore, so the set I ordered from their website was what is available.

So, just waiting for those parts to arrive this week and I will have everything.

[cvtroger]

I am almost sure grade matters.

I got order in today and going through the bearings really quick, I noticed that the crankshaft bearings that I ordered (11701-75022-02), one of them was marked with 2, the other marked with 1.

1873