Confusing Bearing Part Numbers

[Sam]

Yay! The last parts for my 1500 engine have arrived - But I cant make sense of the part numbers.

I ordered (and paid for) king trimetal bearings.

 

The big end shells are stamped:

M341 STD MK

 

The Box reads:

CB6041 STD and MB 341AM STD

 

The Invoice reads:

RTC1753 CL STD "Copper Lead"

 

The BEs are a similar scenario.

 

Anyone know if these are the good bearings?

 

Thanks very much!

[Nick Jones]

I thought the Tri-metal ones had "HD" on them somewhere? Could be wrong about that though. Have some somewhere will look 'em out.

 

Nick

[Sam]

I think I've sorted it out....

 

From the King website:

Alloy (AM), an alloy of aluminum, tin and copper-Plus Alloy on high-strength steel. (Bi-metal bearing)

Babbitt on Steel (BB) in precision, micro or conventional thickness. (For Cam Bearings)

Copper-Lead on Steel (CP) with .001" Copper-Lead-Tin Overplate. (Tri-metal bearing)

Alecular Silicon (SI), a highly versatile, wear-resistant and durable material preferred by OE manufacturers. (Bi-metal bearing)

 

The CL ("copper lead") and CB tags confused me. CP is what I need.

 

I managed to get hold of the seller who confirmed a mistake and that these are the wrong parts. Unfortunately this means yet another productive weekend lost.

 

I stumbled on this article that explains bearing materials quite well,if anyone is interested:

http://www.enginebuildermag.com/Article/2054/crankshafts_and_bearings__keeping_the_relationship_strong.aspx