3618 Engine Caterpillar

Cylinder Head - Disassemble

Usage:

3618 2MW

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1U-9352	Engine Stand	1
A	8T-2826	Head Adapter	1
B	-	Fabricated Plate ⁽¹⁾	1
	-	Fabricated Plate ⁽²⁾	1
	8T-2679	Valve Guide Rod	1
	1D-4720	Nut	2
C	8T-2660	Valve Spring Compressor	1
	515–1161	Valve Spring Compressor Tool ⁽³⁾	-
	8F-6350	Bolt	1
	5B-2638	Bolt	1
	4B-5271	Washer	1
D	9U-5096	Bridge Assembly	1
	130-1449	Valve Seat Puller	1
	6V-7047	Hydraulic Puller	1
E	1P-1860	Retaining Ring Pliers	1
F	8T-2676	Valve Guide Driver	1
G	9U-5096	Bridge Assembly	1
	6V-7047	Hydraulic Puller	1
	4C-8731	Dowel Puller Rod	1
H	9U-6399	Valve Guide Installation Gauge	1
H	9U-6401	Valve Guide Wear Gauge	1

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⁽¹⁾	Fabricate the plate from 6.4 mm (0.25 inch) flat stock. The outside dimensions of the plate are 32 mm (1.25 inch) by 133 mm (5.25 inch). Drill a 16.5 mm (0.65 inch) hole in the center.
⁽²⁾	Fabricate the plate from 6.4 mm (0.25 inch) flat stock. The outside diameter is 203 mm (8 inch). Drill a 16.5 mm (0.65 inch) hole in the center.
⁽³⁾	This tool is an alternative Valve Spring Compressor Tool.

Start By:

Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove".

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NOTICE

Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.

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Illustration 1	g00651675

Install cylinder head (1) on Tooling (A). The weight of cylinder head (1) is approximately 205 kg (450 lb). Position cylinder head (1) with the springs upward.
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Illustration 2 g00651685

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Illustration 3 g00651686

Install Tooling (B) onto the cylinder head. The threaded end of the rod protrudes from the bottom of the cylinder head.

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Illustration 4	g00651692

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Do not remove or install the spring locks with your fingers. If the spring should move, personal injury may result.

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Personal injury can result from parts and/or covers under spring pressure.
Spring force will be released when covers are removed.

Be prepared to hold spring loaded covers as the bolts are loosened.

Install Tooling (C) onto the cylinder head.
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Illustration 5 g00651693
Compress the springs with Tooling (C) and use a magnet to remove locks (2).
Remove Tooling (C) from the cylinder head.
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Illustration 6 g00651698
Remove rotocoils (3).
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Illustration 7 g00651700

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Illustration 8 g00651701
Remove outer valve springs (4) and inner valve springs (5). Inspect the valve springs.
The free length of inner valve spring (5) is 107.00 mm (4.213 inch). The force that is required to compress inner valve spring (5) to a length of 79.25 mm (3.120 inch) is 325 to 397 N (73 to 89 lb).
The free length of outer valve spring (4) is 114.00 mm (4.488 inch). The force that is required to compress outer valve spring (4) to a length of 84.87 mm (3.340 inch) is 682 to 834 N (153 to 188 lb).
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Illustration 9 g00651713
Remove spring guides (6).
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Illustration 10 g00651717
Rotate the cylinder head for 180 degrees to orient the valve seats upward. Be careful not to allow the valves to fall from the cylinder head and remove Tooling (B).
Remove valves (7). Mark the valves and the bores for original installation upon assembly.
Inspect the valves and valve seats for wear. Reface the valves to get a new sealing surface.
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Illustration 11 g00651728
If valve seats (8) must be removed, use Tooling (D). Engage the seat removal plate of Tooling (D) with the lower edge of the valve seat.
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Illustration 12 g00651752
Use Tooling (E) to remove the retaining ring from valve guide (9).

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NOTICE

Do not strike the highly finished surface of the cylinder head with hammer at any time, or damage to this surface will occur.

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Illustration 13 g00651758
Use Tooling (F) to remove valve guides (9). Inspect the valve guides.
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Illustration 14 g00651770
Remove O-ring seals (10) from valve guide (9).
Use Tooling (H) to measure the inside diameter of valve guide (9). The correct inside diameter is 16.031 ± 0.028 mm (0.6311 ± 0.0011 inch).
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Illustration 15 g00651774
Inspect bridge dowels (11). If the bridge dowels must be replaced, use Tooling (G) to remove the bridge dowels. Do not allow Tooling (G) to fall as the bridge dowels are removed from the cylinder head.
Thoroughly clean the cylinder head and inspect the cylinder head.
Inspect the water jacket of the cylinder head. If cleaning is necessary, remove all the plugs from the cylinder head. Use the hot tank process for cleaning.