Crank bearings color code?

[Radugns]

Hi,

I am very confused as after disassemble my 172 engine the main bearings and big end bearings are engraved with a part number that could not be found after calling Renault dealer and some colors. The big end bearings are engraved with NOIR and the main bearings are engraved with BLEU. Does the color says anything regarding the grinding level the crankshaft from factory?

Thanks,
Radu

 

[Gray]

The colour relates to clearance / size of the bearings IIRC... Renault installed different size bearings to accommodate tool wear, when manufacturing the engine.

Annoyingly, Renault only supply 1 set of main and big end bearings for the engine - As you've found out.

Your best bet is having the block / caps line bored and purchasing bearings to suit.

 

[flebay]

The colour relates to clearance / size of the bearings IIRC... Renault installed different size bearings to accommodate tool wear, when manufacturing the engine.

Annoyingly, Renault only supply 1 set of main and big end bearings for the engine - As you've found out.

Your best bet is having the block / caps line bored and purchasing bearings to suit.

That's got to be the most useful thing I've read on cliosport for years.

 

[Gray]

That's got to be the most useful thing I've read on cliosport for years.

Maybe because I am old skool, or maybe because I went through the same grief building a forged F4R engine... Or maybe both!

 

[Radugns]

So I have to use aftermarket bearings because Renault ones are only in standard size. Nice one Renault!

 

[Gray]

So I have to use aftermarket bearings because Renault ones are only in standard size. Nice one Renault!

The Renault items *might* be fine, all depends how your clearances measure up... If they're out, look at King or Glyco bearings - They offer different sizes for the F4R engine.

 

[Radugns]

The Renault items *might* be fine, all depends how your clearances measure up... If they're out, look at King or Glyco bearings - They offer different sizes for the F4R engine.

Thanks a lot. I will measure the journals and then check for Glyco because are available in Romania also.

Radu

 

[JamesBryan]

Plastigauge them and see if they are in tolerance.

 

[Radugns]

I will use a micrometer as I do not have plastiguage.

 

[STEVE.M]

I will use a micrometer as I do not have plastiguage.

http://plastigauge.co.uk/

 

[m&l172ph1]

Hi,

I am very confused as after disassemble my 172 engine the main bearings and big end bearings are engraved with a part number that could not be found after calling Renault dealer and some colors. The big end bearings are engraved with NOIR and the main bearings are engraved with BLEU. Does the color says anything regarding the grinding level the crankshaft from factory?

Thanks,
Radu

Have the same in my f4rt.

Did you use std bearings OK?

 

[Radugns]

Have the same in my f4rt.

Did you use std bearings OK?

Yes, standard ones have 0.04 and 0.05 clearance which is right.