GASKET 1218079 - Caterpillar

Truck Engines:
C-12 (S/N: 1YN1-UP)
C-10 (S/N: 2PN1-UP)
Service Manual Module, SENR1002-02, "Disassembly and Assembly", Page 63, "C-10 & C-12 Truck Engines"In the "Cylinder Head Assembly" section, the procedure for tightening the cylinder head bolts has been changed. Refer to the following procedure in order to tighten the cylinder head bolts.
Lubricate the following components with 6V-4876 Lubricant : the bolt threads, the underside of the bolt heads and the washers. Install the cylinder head bolts and the washers.
Illustration 1 g00517501
Note: There are currently two types of cylinder head bolts that are being used. The first type is a full shank design that is shown in Illustration 2. The second type is a reduced shank design that is shown in Illustration 3.Note: Engines that are equipped with a compression brake will have three head bolt studs. Install the head bolt studs in positions (2), (8), and (10). Tighten the head bolt studs in sequence with the cylinder head bolts.
Illustration 2 g00661561
Cylinder head bolt with full shank designDimension (A) for the full shank design is the following amount: 15.73 mm (0.619 inch)
Tighten the cylinder head bolts with the full shank design according to the following procedure:
Tighten bolt (1)