Looking for source of 40mm connecting rod bearing

[ujonsson]

Hi,

I am trying to improve the life of a Connecting rod bearing in a compressor. The Bearing is a Aluminum Tin Copper bearing (79/20/1). The Crank shaft is a hardened nodular iron shaft. I have got the advice that the bearing alloy is not a good choice for an application with a nodular iron shaft where direction of rotation is random.

I am trying to find a source of a 40mm AlSnSi or a Tri-metal bearing that could fit. The bearing od is 43mm and the overall width is about 27mm. The conrod is 30 wide.

The only one I found by searching the web is a Toyota engine 4A-GE that has the right diameter and od but I don't know the width.

Any help is deeply appreciated.

Ulf

 

[Maui]

Contact NSK at

http://www.nsk-corp.com

and ask for help in selecting a compressor bearing for your specific application. There are a variety of other bearing manufacturers as well. A google search should provide you with some results. Good luck.

Maui

 

[ujonsson]

Maui,

Thanks for the suggestion but NSK is not making journal bearings according to their website.

Ulf

 

[Chumley]

ujonsson: from your description, I'm assuming you are
looking for a bearing insert rather than a roller bearing
for your connecting rod application. If so, you can get
more information from Mahle (a major manufacturer) here:

http://www.mahleinc.com/home_inc.nsf/out/1.1.2.8?OpenDocument&,8547522

Kolbenschmidt is another major bearing insert manufacturer.

http://www.kolbenschmidt.de/en/index.php

Federal-Mogul is too:

http://www.federal-mogul.com/cda/channel/index/0,2186,2601_5864,00.html

Clevite is also:

http://www.engineparts.com/

There is some other interesting info here:

http://www.kp.dlr.de/WB-RS/Erstarrung/web_eng/lager_eng.html

http://www.bobistheoilguy.com/bearingwear/bearingwearanalysis.htm

Hope this helps,

Chumley

 

[ujonsson]

>There is some other interesting info here:

>

http://www.kp.dlr.de/WB-RS/Erstarrung/web_eng/lager_eng.html

That was a cool link, Allmost like making them out of an Unobtanium alloy

I am working with some bearing manufacturer. My hope was to find a car out there that happen to use a 40x43x30 size bearing or close enough that we can do testing on.

 

[PJGD]

It just so happens that I have been looking for a full set of crank bearings for my obsolete (old British sports car) engine, and had contacted Dana (Clevite/Vandervell/Glacier) with the dimensions and original part numbers. They have just sent me an (internal) listing of all their bearing dimensions, saying "Take your pick" since the original bearings are not available.

Bottom line: Looking at their list for your sizes yielded Clevite Part Number "CB-1405AL" which has the correct ID and OD, but is only 18 mm wide, not 30 mm. Material is Aluminium They do not have a 30 mm wide bearing of your dimensions. Going by another recent post about the VW narrow Vee engines, typical L/D ratios are around 0.3 for grooveless bearings, so your 0.75 L/D sounds like overkill.

PJGD

 

[ujonsson]

Great!

I will contact Clevite, Maybe they can make a wider one in the same tooling. The current bearing has a 360 deg groove so the one you found can probably carry as good or better load. An other posibility would be to cut it to 1/2 the width and install two in one conrod for testing what the material wear properties are against the nodular iron shaft.

Thanks!

Ulf

 

[tbuelna]

ujonsson:

I checked my Clevite book and you can try Clevite p/n
CB-602AL (40.0mm ID x 43.7mm OD x 24.4mm W) It's an aluminum rod bearing for a Fiat engine. If you want a more durable steel-backed bearing, take a look at some motorcycle con rod bearings.

Regards,
Terry

 

[ujonsson]

Thats Great! Thanks a lot!!!

24.4 is about the width we have now accounting for the groove. To have a full bearing will make a lot of difference. Did it specify what type of material? What Fiat?

Ulf

 

[tbuelna]

Ulf:

The Clevite book says Fiat 1089cc engine (1953-1968) and 1221cc engine (1958 on). The bearing material is listed as Clevite AL-3, "steel backed aluminum alloy without overplate".

A bearing construction without plating should be pretty simple to modify width on. It can be machined to proper width without fear of flaking-off of the plating.

Good luck.
Terry

 

[PJGD]

Terry;
Interestingly, the Clevite part number that you quoted does not appear on the list that Clevite e-mailed to me just this week. My understanding was that this list represented currently available bearing part numbers, both new and aftermarket. Your Fiat application is quite old (it overlaps with my obsolete early fifties application). Is it possible that it too is unavailable direct from Clevite?

Ulf may have to look for that bearing as NOS from within the Fiat community........

PJGD

 

[JayMaechtlen]

"direction of rotation is random"????
how can this be?

by the way- have you looked at oil type and supply?
what kind of failures were you getting with the stock inserts?

Jay


Jay Maechtlen

 

[ujonsson]

We have very good oil supply, around 50 to 80psi, builds up in 0.2-0.3 seconds.

The radom directionality is due to a three phase motor. There is no easy way to check direction of rotation.

Ulf

 

[JayMaechtlen]

I didn't know there were 3-phase motors that would randomly chose direction. (oh- you mean that, in the field, it could be wired either way?)

what kind of failures do you get?
wiping?
flaking/cratering?
or ?

Jay

Jay Maechtlen

 

[ujonsson]

Right, you cant be sure how it is wired by the installer.

The bearing show heavy abrasive/adhesive wear during start-stop testing.

Anyone with experience of aluminum-tin bearings versus Al,Sn,Si bearings in terms of ability to manage nodular iron shafts? Tri metal vs aluminum?

Ulf

 

[GregLocock]

Jay

the usual problem is that the machining and finishing on the cranks raises burrs. The wear rate if you run the crank the wrong way can lead to unacceptable failures at 1% or less of the normal life of the bearing.

BT, very expensively, DT



Cheers

Greg Locock

 

[ujonsson]

I seen this claim before. Do you have any direct experience?

We can see a fair amount of ferrite caps left on the shafts. 20% of them maybe?

Ulf

 

[GregLocock]

Yes, the problem was the direction of the lapping on the crank.

Cheers

Greg Locock

 

[ujonsson]

What was the failure mechanism? abrasive wear or a secondary effect due to the ferrite caps?

How long did it last and what was the application.

Ulf

 

[GregLocock]

Wear of the shaft or the shell (I don't know). At a guess it was 20-50 hours? Sorry can't tell you the app.

Cheers

Greg Locock