Bearing colour codes??? - Alfa Romeo Forum
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(Post Link) post #1 of 15 Old 17-07-09 Thread Starter
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Bearing colour codes???

Hi,

Following on from the bearing shells thread, one of the dealers that Mike2909 has asked for big-end bearings from are asking for the colour of the marker dot on the existing shells.

We've searched all over the conrod and bearings, but can't see what they're on about. Apparently there should be a coloured dot that indcates the bearing thickness.

Anyone ever spotted one?

Cheers,

Iain
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You wont find it on a second hand bearing Iain. They mark the SIDE of the shell in the middle with the colour but it would soon be oil washed away. These are the colours and sizes for the 1970cc Twin Spark.

Class A - Red 1.836 + 1.840 mm
Class B - Blue 1.839 + 1.842 mm
Class C - Yellow 1.842 + 1.846 mm

For the 1747 cc Twin Spark

Class A - Red 1.527 + 1.531 mm
Class B - Blue 1.531 + 1.535 mm
Class C - Yellow 1.535 + 1.539 mm


All is not lost though, the 3 sizes have different part numbers. You can get the part number off the back of a shell and Eper them. Mine were still very clear. The part number had changed but Eper allows for that.

81 'Sud 1.5 Super - '88 33 1.7 Green Cloverleaf -'92 164 2.0 Twinnie - '94 164 2.0 Twinnie -'99 166 2.5 V6 Sportronic -'00 166 2.5 V6 Manual-'03 156 2.4 JTD Veloce-'97 GTV 2.0 Twinspark

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Last edited by Mitch916; 18-07-09 at 13:14.
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(Post Link) post #3 of 15 Old 18-07-09 Thread Starter
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Thanks - I'll try that. I've certainly found the part number on the shells.

Cheers,

Iain
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PS Are the Class A ones the standard size?
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yes mate, red is std.
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Thanks!
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(Post Link) post #7 of 15 Old 19-07-09 Thread Starter
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Oooh, I'm really confused now

The shells that were on the conrods and crank that I am using to replace the wrecked one were from an R-reg 2.0 CF2 engine. The number on the shells is 7646454.

ePer says that these were replaced by P/N 71728417, which (according to ePer) are 1.8 Class A (SP=1,527-1,531)

The shells that were on the wrecked crank (2.0 CF3) are 46738752, and were replaced by 71718342, and are also SP=1,527-1,531.

71728417 is for M3/M5/M20 engines (2.0L)
71718342 is for M2/M15 engines (1.8L)

Maybe someone in the past has changed the crank in the donor engine...or...bought the wrong shells.

In which case, should I order the 2.0 shells or the 1.8 shells??? Either way, I need the SP=1,527-1,531 right????

Thanks again!

Last edited by iainfm; 19-07-09 at 14:51.
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I think you need to measure the crank journal and order the bearing to suit. Is there a part number on the crank so you can check it is correct? Thats the trouble with second hand parts (That we are all forced to use on occasion) you can never be 100% sure on what you are getting!
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(Post Link) post #9 of 15 Old 20-07-09 Thread Starter
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Journals measure as standard (50.80mm IIRC). Haven't checked the crank p/n... Will have a look tonight
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Yep 50.8mm would as you say, be standard. I would guess someone fitted the wrong shells then mate. Stick the STD ones on for the engine and you should be ok.

Edit

The 1.8 and the 2.0 have a common crank by the looks of things, it's just the con rods that have a different size.

Last edited by Mitch916; 20-07-09 at 09:07.
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I'll get a set of shells based on what were on the conrods and crank that were in the donor engine. They're going in as-was, with the pistons swapped with the recipient car...

Edit: The shells that were on the donor crank are definitely 2.0 standard shells.

ePer suggests that the 1.6 and 1.8 cranks are the same, but the 2.0 is different. Will need to check p/n of crank and conrods I think....

Edit 2: But the conrods for the 1.8 and 2.0 are the same, but the 1.6 is different.

Last edited by iainfm; 20-07-09 at 10:18.
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Damn confusing!!!
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be careful, each journel can be different sizes
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Quote:
Originally Posted by SEARs View Post
be careful, each journel can be different sizes
Not from new they wont be, possible if someone had one journal damaged and had it reground but from the factory all 4 will be the same.
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so a std journel is 50.8mm

Class A will fit that

Class B for upto +0.002mm

Calss C for upto another +0.004mm

Last edited by SEARs; 15-08-09 at 20:56.
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