2002/07/01 Caterpillar

Front Housing Bolts for the C-10 and C-12 {1151}

Usage:

C-12 1YN

Truck Engine: C-10 (S/N: 2PN1-UP; 3CS1-UP; 8YS1-UP) C-12 (S/N: 1YN1-UP; 2KS1-UP; 9NS1-UP; 9SM1-UP; CPD1-UP; CPN1-UP)

The front of the engine block has been modified. This modification requires the use of a new front cover gasket and different bolts that attach the front housing to the engine block. The new front cover gasket and different bolts help to provide an improved seal between the front housing and the engine block. The correct bolts need to be used to attach the front housing. Use Table 1 to identify your Type of engine.

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Table 1
	Engine Model	Serial Number (Type 1)	Serial Number (Type 2)
Truck	C-10	S/N:2PN1-UP	-
	C-10	S/N:8YS1-UP	-
	C-10	S/N:3CS1-21950	S/N:3CS21951-UP
	C-12	S/N:1YN1-UP	-
	C-12	S/N:9NS1-UP	-
	C-12	S/N:2KS1-69602	S/N:2KS69603-UP
	C-12	S/N:CPD1-304	S/N:CPD305-UP
	C-12	S/N:CPN1-323	S/N:CPN324-UP
	C-12	S/N:9SM1-862	S/N:9SM863-UP

Table 1 is your guide for selecting your correct Type of engine. If your engine is a Type 1 proceed to "Type 1". If your engine is a Type 2 proceed to "Type 2". If you have a remanufactured engine proceed to "Remanufactured Engines". The following illustrations will provide added information on the installation of the front housing.

Check for availability of a gasket kit. The gasket kit will include a new front cover gasket, both the 30 mm (1.18 inch) bolts and the 40 mm (1.57 inch) bolts. This kit can be used to service Type 1, Type 2, and Remanufactured Engines.

Type 1

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Illustration 1	g00856488
6V-2317 Bolt

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Illustration 2	g00856491
204-0712 Bolt

The two bolts (Type 1) are 30 mm (1.18 inch) long. Marks on the head of the bolt represent the grade of the bolt. These markings can be seen in illustration 1 and 2. The 6V-2317 Bolt is replaced by 204-0712 Bolt. The 204-0712 Bolt has a torque value of 40 ± 8 N·m (30 ± 6 lb ft). 13 bolts are required for the installation of the front housing.

Type 2

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Illustration 3	g00856344
40 mm (1.57 inch)

The 40 mm (1.57 inch) is 10 mm (0.39 inch) longer than the 204-0712 Bolt. The longer bolt is needed due to a deeper counterbore and the tapped hole. Do Not use the 204-0712 Bolt or the 6V-2317 Bolt. This could result in damage to the threads. The torque on the 40 mm (1.57 inch) bolt is 35 ± 8 N·m (26 ± 6 lb ft). 13 bolts are required for the installation of the front housing.

Remanufactured Engines

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Illustration 4	g00838008
Depth of counterbore (Y) requires engines to use 204-0712 Bolt .

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Illustration 5	g00838007
Depth of counterbore (Z) requires engines to use a 40 mm (1.57 inch) bolt.

The counterbore in the engine block must be measured in order to determine the bolts that will be used. If your engine block has a counterbore (Y) of 5 mm (0.20 inch), proceed to "Type 1". If your engine block has a counterbore (Z) of 15 mm (0.60 inch), proceed to "Type 2".

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