How do you pick the correct size cranck shaft bearing and Con rod bearing.

[Davezj]

well i have stripped my engine out of my car to replace the head gasket due to a failure.

so while it is out i am going to refresh the bearings on the cranck shaft and the con rod big end.

i have done a bit of reading on the subject and i know the bears fitted at the factory are stampted in the block and on the crank.
the block numbers are for the bearings and the crank numbers are for the con rods.

the conrods bearings are ok are i can work out what size i need 2 2 1 2 2 2

thrust bearings are a one size fits all set

but the crack bearings are listed as 0 0 1 1 and all the stuff i look at specify size 1 2 3 4 5 so i am not sure what is going on.


any help will be greatly received.

[TAR]

Crankshaft bearings are usually stamped on the back edge. You need to take one out and clean the back of it. Thet are likely to be standard size. If the crankshaft is not grooved, pitted or otherwise damaged, you'll probably just need more standard sized shells.

You can measure them to check the bearing clearance using a micrometer and a dial bore gauge.

[Davezj]

Yeh I kind of know that,
But I have not stripped the bearings out of the engine yet. So I can't see the colour code on the back
So I thought I could find out what the number mean.

I know the numbers reference the size of the bearings. With a max and min dimension.
But the zero does not seem to exist.




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[adaxo]

Im sure @Adam.Findlay will know that Dave

[Davezj]

The mark on the block are layed out like this.

CBB 0011
BBB

I should have taken a pic while the sump was off.
The letter are something to do with the cylinder bores. The crank bearing size are the 0 0 1 1 as there are only 4 of them.

The mark on the crank itself looks like this.

II II
I II
II II 1

these are the con rod bearings size.

So if anyone know where I can look these bombers up to get the correct size bearings it would be very helpful


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[Davezj]

Im sure @Adam.Findlay will know that Dave

Yes he probably will know, but he is not on here very often.
I think I will give him a shout on OZVR4.

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[Davezj]

Ok so here is all the info from ozvr4

https://www.ozvr4.com/threads/crank-...em-with.16302/

But it has no more info than I already have.

I must be reading the manual page wrong as I can't work out which size bearings I need to get.


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[Davezj]

ok so here is the PWE9622 supliment engine manual.
it covers 6A12 DOHC and 6A13 SOHC NOT the 6A13TT DOHC but the way you work out the size of the bearings is the same.

6A12_6A13 engine manual.pdf

see pages 11A-14-5 for con rods bearing selector charts based on the numbers stamped on the Crank.

see pages 11A-15-2 for crank bearing selector charts based on the numbers stamped on the Block.

can someone tell me how the table should be read.

[Davezj]

Ok so it looks like i am reading the manul wrong for the crank bearing.
the marks on the crank at the gearbox end which i have quoted above is the con rod size ident mark which should be repeated on the back of the bearing shell with a colour but basically the ident mark is the size of the con rod bearing you need. see below.


Con rod bearing size ident.jpg


this is what i was having trouble working out for the crank shaft bearings. i think i am missing a bit of info i need to know the correct size of the bearings.
i dont have the size ident markings from the timing belt end of the crank.
so i think it is this that is confusing me.

Crank bearing ident.jpg

right so i have got it now.
you use the cranshaft journal number (which i dont have) from the timing belt end of the crank. Then apply the Cylinder Block Bearing Bore number (which i do have 0 0 1 1) and this will give you the bearing number to order from the 1 to 5 size option.

So as an example for my engine

for the no. 1 bearing
cranshaft journal number 1 (guess for the exaple)
Cylinder Block Bearing Bore number 0
Bearing shells size required is 1 (MD344357 STD 1)

[Davezj]

Here are the Standard factory available Mitsubishi part numbers of all the bearing you might need and the Mitsubushi Dealer retail price at time of writing post.

Crank shaft Bearings:-
required 4
£11.59 +Vat (£13.91) Each

MD344357 STD 1
MD344358 STD 2
MD344359 STD 3
MD344360 STD 4
MD344361 STD 5

Crank Thrust Bearing Set:-
Required 1
£20.45 +Vat (£24.54)

MD344362

Con Rod Bearings:-
required 6
£11.69 +Vat (£14.03) Each

MD344363 STD 1
MD344364 STD 2
MD344365 STD 3


And for good measure

Piston Rings Set:-
required 1
£132.21 +vat (£158.65)

MD336736 STD

[Davezj]

I now have all the info I need from the engine to pick the correct bearings.
See pic below.

IMG_20171112_134900.jpg

IMG_20171112_134436.jpgIMG_20171112_134443.jpgIMG_20171112_134451_HDR.jpg

[Davezj]

from the information gained today i have worked out the bearings i need to buy for my engine are as follows.

crank bearing required:-

CJ = Crank Journal
CBBB = Cylinder Block Bearing Bore

Bearing 1 = CJ 3 CBBB 0 = size 3 (MD344359 STD 3)

Bearing 2 = CJ 2 CBBB 0 = size 2 (MD344358 STD 2)

Bearing 3 = CJ 2 CBBB 1 = size 3 (MD344359 STD 3)

Bearing 4 = CJ 3 CBBB 1 = size 4 (MD344360 STD 4)


Con Rod Beraings:-

CP = Crackshaft Pin

Bearing 1 = CP II = size 2 (MD344364 STD 2)

Bearing 2 = CP II = size 2 (MD344364 STD 2)

Bearing 3 = CP I = size 1 (MD344363 STD 1)

Bearing 4 = CP II = size 2 (MD344364 STD 2)

Bearing 5 = CP II = size 2 (MD344364 STD 2)

Bearing 6 = CP II = size 2 (MD344364 STD 2)



Does anyone see any errors in my working out.