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
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
Maui
RE: Looking for source of 40mm connecting rod bearing
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
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
>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
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
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
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
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
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
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
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
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
what kind of failures do you get?
wiping?
flaking/cratering?
or ?
Jay
Jay Maechtlen
RE: Looking for source of 40mm connecting rod bearing
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
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
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
Cheers
Greg Locock
RE: Looking for source of 40mm connecting rod bearing
How long did it last and what was the application.
Ulf
RE: Looking for source of 40mm connecting rod bearing
Cheers
Greg Locock
RE: Looking for source of 40mm connecting rod bearing
The thread about crank polishing had several links.
RE: Looking for source of 40mm connecting rod bearing
RE: Looking for source of 40mm connecting rod bearing
Can someone post that link, please?
Jay Maechtlen