Clevite Cam Bearing GM 231 3.8L 1995-2004 FI STD.

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Description
Brand: Clevite
Part Number: SH1812S
Condition: New
Sold As: Individual

General Motors Clevite B-1, Bi-Metal Cam Bearing Set fits the following:
231 CID 3.8L Fuel Injected Buick V6 cylinder 1995-2004 NOTE: VIN K,
231 CID 3.8L Supercharged Buick Supercharged V6 cylinder 1996-2004.

Clevite B-1 Cam Bearings are B-60 Steel backed bearing with a conventional babbit lining

Clevite Cam Bearing Set part number: SH1812S (Standard)

The first commonly used bearing material was an alloy of lead, tin, antimony and arsenic called “Babbitt” which was named after its inventor. Babbitt has physical properties similar to solder. It’s soft which allows it to conform to minor imperfections in geometry and alignment of mating parts. This softness also allows Babbitt to absorb dirt and wear particles that might pass through the bearings clearance space. Babbitt is also very slippery which minimizes friction in the absence of oil during startup.

Although Babbitt is the best bearing material based on its surface behavior, it has one serious shortcoming. By itself, in thick layers, Babbitt cannot carry high loads for long periods. Under the repeated cyclic loading of an internal combustion engine Babbitt will break up and flake out. This reaction to cyclic loading is called “Fatigue.” Bearings are typically constructed with a steel backing to provide support and allow the bearing shells to be an interference fit with their housing.

The earliest insert bearings were Bi-metal construction with a lining of Babbitt. As mentioned above, although Babbitt offered optimum surface behavior, it lacked fatigue strength. It was found however, that the fatigue strength of Babbitt could be significantly improved by reducing its thicknes.

Clevite B-1 Cam Bi-metal “MICRO BABBITT” bearings use a thinner layer of Babbitt lining to provide better fatigue resistance, and Tri-metal bearings which use an extremely thin electroplated overlay layer of Babbitt over a stronger intermediate layer to combine the surface properties of Babbitt with the greater fatigue strength of the intermediate layer. An alloy of Copper, Lead and Tin is the most commonly used intermediate layer.

Original Equipment bearings have employed all of the popular types of materials and construction over the years. Bi-metal Babbitt, Bi-metal Copper- Lead, and Bi-metal Aluminum, have all been used at various times in numerous applications.

Installation of bearings into the block must be done with care to avoid shaving metal off the backs of the bearings. This galling action may cause a build-up of metal between the bearing OD and the housing bore which will result in a reduction in clearance. To prevent galling, check housing bores for a proper 25 to 30 degree lead-in chamfer before installing cam bearings. On blocks without grooves behind the cam bearings, care must be taken to insure that oil holes line up between the bearings and block. Where the block has a groove behind the bearing, the bearing should be installed with the oil hole at the 2 o’clock position when viewed from the front for normal clockwise camshaft rotation. This will introduce oil into the clearance space outside of the loaded area and allow shaft rotation to build an oil film ahead of the load.

Component No. SH-1812 SH-1813

Positions 1-4 2-3

Material B-1 B-1

Min. Std. Shaft Diameter 1.8448"
46.8579mm 1.8448"
46.8579mm

Max. Std. Shaft Diameter 1.8462"
46.8935mm 1.8462"
46.8935mm

Min. Vert. Oil Clearance 0.0005"
0.0127mm 0.0011"
0.0279mm

Max. Vert. Oil Clearance 0.0055"
0.1397mm 0.0057"
0.1448mm

Max. Wall 0.0741"
1.8821mm 0.0641"
1.6281mm

Min. Brg. O.D. or Housing Bore 1.9955"
50.6857mm 1.9755"
50.1777mm

Max. Brg. O.D. or Housing Bore 1.9975"
50.7365mm 1.9775"
50.2285mm

Max. Length 0.7450"
18.9230mm 0.6300"
16.0020mm

Competitor Interchanges

Qty

Comp Qty

Comp Part No.

Comp Name

4C1812S-00

ACL

4C5108-00

ACL

SH1812S

CLEMEX

B-14

DURA BOND

CS4401BB

KING

1889M

SEALED POWER

*Part of a combination interchange requiring multiple parts competitor parts

When installing any bearing
DO NOT ATTEMPT TO POLISH THE BEARING RUNNING SURFACE WITH ANY TYPE OF ABRASIVE PAD OR PAPER.
Bearing overlay layers are extremely soft and thin, typically .0005” on high performance parts.
These thin layers can easily be damaged or removed by abrasive media. Because the overlay layer is electroplated,
it may exhibit microscopic plating nodules that make it feel slightly rough.
The nodules are the same material as the rest of the plated layer and will quickly be flattened by the shaft.

This Part Fits The Following Vehicles

Year Make Model Engine Fit Note
2004 - 1996 Buick LeSabre Custom 3.8L V6 231ci
2004 - 1996 Buick LeSabre Limited 3.8L V6 231ci
2004 - 1995 Buick Park Avenue 3.8L V6 231ci
2004 - 1996 Buick Park Avenue Ultra 3.8L V6 231ci
1998 - 1998 Buick Regal 25th Anniversary Edition 3.8L V6 231ci
1996 - 1996 Buick Regal 3.8L V6 231ci
1996 - 1996 Buick Regal Custom 3.8L V6 231ci
1996 - 1996 Buick Regal Gran Sport 3.8L V6 231ci
2004 - 1997 Buick Regal GS 3.8L V6 231ci
2000 - 2000 Buick Regal GSE 3.8L V6 231ci
1996 - 1996 Buick Regal Limited 3.8L V6 231ci
2004 - 1997 Buick Regal LS 3.8L V6 231ci
2000 - 2000 Buick Regal LSE 3.8L V6 231ci
1996 - 1996 Buick Regal Olympic Gold Edition 3.8L V6 231ci
1999 - 1995 Buick Riviera 3.8L V6 231ci
2002 - 1995 Chevrolet Camaro 3.8L V6 231ci
1997 - 1996 Chevrolet Camaro RS 3.8L V6 231ci
2004 - 2000 Chevrolet Impala 3.8L V6 231ci
2004 - 2000 Chevrolet Impala LS 3.8L V6 231ci
2003 - 2003 Chevrolet Impala LS Sport 3.8L V6 231ci
2004 - 2004 Chevrolet Impala SS 3.8L V6 231ci
1999 - 1999 Chevrolet Lumina 3.8L V6 231ci
1999 - 1999 Chevrolet Lumina LS 3.8L V6 231ci
1999 - 1998 Chevrolet Lumina LTZ 3.8L V6 231ci
1999 - 1999 Chevrolet Monte Carlo Indianapolis 500 Pace Car 3.8L V6 231ci
1999 - 1999 Chevrolet Monte Carlo LS 3.8L V6 231ci
2004 - 2000 Chevrolet Monte Carlo SS 3.8L V6 231ci
2002 - 2002 Chevrolet Monte Carlo SS 35th Anniversary Edition 3.8L V6 231ci
2002 - 2002 Chevrolet Monte Carlo SS Dale Earnhardt Signature Edition 3.8L V6 231ci
2003 - 2003 Chevrolet Monte Carlo SS High Sport 3.8L V6 231ci
2003 - 2003 Chevrolet Monte Carlo SS Pace Car 3.8L V6 231ci
1999 - 1998 Chevrolet Monte Carlo Z34 3.8L V6 231ci
1999 - 1995 Oldsmobile 88 Royale 3.8L V6 231ci
1999 - 1995 Oldsmobile 88 Royale LS 3.8L V6 231ci
1995 - 1995 Oldsmobile 88 Royale LSS 3.8L V6 231ci
1996 - 1995 Oldsmobile 98 Regency Elite 3.8L V6 231ci
1998 - 1998 Oldsmobile Intrigue 3.8L V6 231ci
1999 - 1998 Oldsmobile Intrigue GL 3.8L V6 231ci
1999 - 1998 Oldsmobile Intrigue GLS 3.8L V6 231ci
1999 - 1999 Oldsmobile Intrigue GX 3.8L V6 231ci
1999 - 1996 Oldsmobile LSS 3.8L V6 231ci
1998 - 1997 Oldsmobile Regency 3.8L V6 231ci
2004 - 1995 Pontiac Bonneville SE 3.8L V6 231ci
2004 - 2000 Pontiac Bonneville SLE 3.8L V6 231ci
1999 - 1995 Pontiac Bonneville SSE 3.8L V6 231ci
2003 - 2000 Pontiac Bonneville SSEi 3.8L V6 231ci
2002 - 1995 Pontiac Firebird 3.8L V6 231ci
2003 - 1997 Pontiac Grand Prix GT 3.8L V6 231ci
2004 - 2004 Pontiac Grand Prix GT1 3.8L V6 231ci
2004 - 2004 Pontiac Grand Prix GT2 3.8L V6 231ci
2004 - 1997 Pontiac Grand Prix GTP 3.8L V6 231ci
2002 - 1997 Pontiac Grand Prix SE 3.8L V6 231ci



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