×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Looking for source of 40mm connecting rod bearing

Looking for source of 40mm connecting rod bearing

Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

Contact NSK at 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

RE: Looking for source of 40mm connecting rod bearing

(OP)
Maui,

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

Ulf

RE: Looking for source of 40mm connecting rod bearing

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





RE: Looking for source of 40mm connecting rod bearing

(OP)
>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.

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

"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

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

Cheers

Greg Locock

RE: Looking for source of 40mm connecting rod bearing

(OP)
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

RE: Looking for source of 40mm connecting rod bearing

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

RE: Looking for source of 40mm connecting rod bearing

Is the lube pressure fed thru the crank via the main bearings?  If pressure fed, there are right and wrong locations to introduce oil for a particular crank rotation, and allowing alternate rotations is not helping matters any.  A groove in the final destination bearing is pretty bad too, reducing capacity by much more than the lost area.  Maybe left over from a splash design, or a borrowed part ?  

The thread about crank polishing had several links.

RE: Looking for source of 40mm connecting rod bearing

(OP)
I will look for that link, thanks!!

RE: Looking for source of 40mm connecting rod bearing

I searched for that thread, couldn't find it.
Can someone post that link, please?

Jay Maechtlen

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources