855811 Volvo.Penta Screw

Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     4C-6366     Valve Guide Driver     1    Start By:
Remove the inlet and exhaust valves and remove the valve stem seals. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: When new valve guides are installed, new valves and new valve seat inserts should be installed.
Illustration 1 g01369083
Typical example
Use Tooling (A) and a suitable press in order to remove valve guides (1) from the cylinder head. Refer to Illustration 1.
Remove the valve seat inserts. Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Seat Inserts - Remove and Install".Installation Procedure
Table 2
Required Tools    
Tool     Part Number     Part Description     Qty    
A     4C-6366     Valve Guide Driver     1    
B     4C-6370     Valve Guide Collar     1    
C     157-3720     Valve Seat Cutter     1    
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 2 g01369084
Typical example
Position valve guides (1) in the cylinder head. Carefully tap the valve guides with a soft faced hammer in order to locate the valve guides in the cylinder head.Note: Ensure that the valve guides are located squarely in the cylinder head.
Use Tooling (A), Tooling (B) and a suitable press in order to install the valve guides in the cylinder head. Press the valve guides until Tooling (B) bottoms out on the cylinder head.Note: The counterbore in Tooling (B) ensures that the valve guides are installed to the correct height.
Check the protrusion (X) of the valve guides. Refer to Specifications, "Cylinder Head Valves" for the protrusion of the valve guide above the valve spring recess in the cylinder head.
Install the valve seat inserts. Refer to Disassembly and Assembly, "Inlet and Exhaust Valve Seat Inserts - Remove and Install".
Illustration 3 g01000177
Note: After installing the valve guides and valve seat inserts, the valve guides must be reamed and the valve seat inserts must be cut to the finished diameter. The valve guides and valve seat inserts are cut and reamed in one operation. This procedure ensures the concentricity of the valve seat to the valve guide in order to create a good seal. Refer to Specifications, "Cylinder Head Valves" for the finished diameter of the valve guides and valve seat inserts.
Position Tooling (C) into the valve guide. Carefully turn Tooling (C) in a clockwise direction and gradually move the reamer into the valve guide until the valve guide is reamed to the finished size.
Continue to turn Tooling (C) in a clockwise direction in order to cut the valve seat insert. Remove the minimum amount of material in order to ensure a good valve seat. Keep the valve seat as narrow as possible.
Remove Tooling (C). Clean the debris from the valve guide and the valve seat.End By: Install the inlet and exhaust valves. Refer to Disassembly and Assembly, "Inlet and Exhaust Valves - Remove and Install".