2000/12/01 Caterpillar

New Cylinder Head Gasket for C-10and C-12 Truck Engines {1124}

Usage:

C-12 1YN

Engine: C-10 (S/N: 2PN1-UP; 3CS1-UP; 8YS1-UP); C-12 (S/N: 1YN1-UP; 2KS1-UP; 9NS1-UP)

SEBD6730, 01, December 2000, New Cylinder Head Gasket for C-10 and C-12 Truck Engines . Disregard this previous article. The article that follows has updated information.

Description Of Change: New cylinder head gaskets have been introduced for the C-10 and C-12 engines.

Adaptable To:

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Illustration 1	g00764790
187-3307 Cylinder Head Gasket (1) Straight Edge

The new 187-3307 Cylinder Head Gasket Assembly is used for current production and parts service. This part number replaces part numbers in Table 1. This gasket must be used on C-10 engines with serial numbers: 3CS719 - Up and 8YS5389 - Up. On C-12 engines, this gasket must be used with serial numbers: 9NS16228 - UP and 2KS389 - Up. See Illustration 1.

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Illustration 2	g00764788
187-3306 Cylinder Head Gasket (1) Scalloped Edge

The 187-3306 Cylinder Head Gasket Assembly is used for service parts only. This part number replaces part numbers in Table 1. This gasket must be used on C-10 engines with serial number ranges: 2PN1 - Up, 8YS1-5388 and 3CS1 - 718. On C-12 engines, this gasket must be used with serial numbers:1YN1 - Up, 9NS1 - 16227 and 2KS1 - 388. See Illustration 2.

See Table 1 for usage of gasket.

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Table 1
Component	Scalloped Edge - Former	Scalloped Edge - Current	Straight Edge - Former	Straight Edge - Current
Cylinder Head Gasket	116-3779 126-0065 148-2048 162-0486 172-8182 175-7350	187-3306⁽¹⁾⁽²⁾	162-0682 170-4833 175-7400	187-3307⁽³⁾⁽⁴⁾
Cylinder Block		128-0406		162-0681
Cylinder Head		4P6510		162-0683
Lifter Bracket Assembly		129-2882		148-2064

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⁽¹⁾	Gasket to be used with Serial Numbers: 1YN1 - Up, 2PN1 - Up, 9NS1 - 16227, 2KS1 - 388 and 3CS1 - 718
⁽²⁾	See Illustration 2.
⁽³⁾	Gasket to be used with Serial Numbers: 9NS16228 - Up, 2KS389 - Up, 3CS 719 - Up and 8YS5389 - Up
⁽⁴⁾	See Illustration 1.

Note: It is very important to use the correct cylinder head gasket. Refer to the description of components and Table 2 for interchangeability.

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Table 2
Cylinder Block	Cylinder Head	Head Gasket
162-0681	162-0683	187-3307
162-0681	4P6510	187-3306
128-0406	4P6510	187-3306
128-0406	162-0683	187-3306

Cylinder Head

There are two cylinder heads. The old design has 4P-6510 on the casting. This design has a scalloped edge along the camshaft side of the cylinder head. The new design has 162-0683 on the casting. This design has a straight edge along the camshaft side of the cylinder head. See Table 2 for interchangeability.

Cylinder Block

There are two cylinder blocks. The old design has 128-0406 on the casting. This design has a scalloped edge along the camshaft side of the cylinder block. The new design has 162-0683 on the casting. This design has a straight edge along the camshaft side of the cylinder block. See Table 2 for interchangeability.

Lifter Bracket Assembly

There are two new bracket assemblies. The new 148-2064 Bracket As for the camshaft followers will replace the former 129-2884 Bracket As. The new 148-2065 Bracket As will replace the former 129-2882 Bracket As.

Use the 148-2063 Valve Lifter Group with the new brackets for the camshaft follower.

Note: The old 129-2884 Bracket As for the camshaft follower can not be used with the 162-0681 Cylinder Block. The new 148-2064 Bracket As for the camshaft follower can not be used with the old 128-0406 Cylinder Block.