72436A 1 Mercury TRIM TAB ASSEMBLY, GEAR HOUSING

Table 1
Specifications for 336-5446 Inlet Valve and 336-5447 Exhaust Valve    
Callout     Part Number     Part Name     Specification Description    
3     332-7941     Spring     The load for the inlet valve spring is
209 to 231 N (47 to 52 lb).
The length of the inlet valve spring is
31.5 mm (1.2402 inch).
The load for the inlet valve spring is
389.5 to 430.5 N (87.5 to 97 lb).
The length of the inlet valve spring is
22.2 mm (0.87401 inch).    
3     326-7290     Spring     The load for the exhaust valve spring is
161.5 to 178.5 N (36.3 to 40.1 lb).
The length of the exhaust valve spring is
31.5 mm (1.2402 inch).
The load for the exhaust valve spring is
337.9 to 373.5 N (76 to 84 lb).
The length of the exhaust valve spring is
21.5 mm (0.8465 inch).    
-     -     -     Inlet valve face angle is 30 degrees.
Exhaust valve face angle is 45 degrees.    
-     -     -     Inlet valve stem diameter is
0.03 mm (0.0018 inch).
Maximum clearance of the inlet valve stem is
0.05 mm (0.0020 inch).
The service limit for the inlet valve stem is
0.08 mm (0.0031 inch).
Exhaust valve stem diameter is
5.927 to 5.942 mm (0.2333 to 0.2339 inch).
Maximum clearance of the exhaust valve stem is
0.065 mm (0.0026 inch).
The service limit for the exhaust valve stem is
0.09 mm (0.0035 inch).    
5     -     Valve     Length of inlet valve is
107.925 to 108.375 mm (4.2490 to 4.2667 inch).
Length of exhaust valve is
107.703 to 108.153 mm (4.2403 to 4.2580 inch).    
-     -     -     Diameter of inlet valve head is
35 mm (1.3780 inch).
Diameter of inlet valve head is
33 mm (1.2992 inch).    Removal Procedure
Table 2
Required Tools    
Tool     Part Number     Part Description     Qty    
A     9U-6195     Valve Spring Compressor     1    
268-1969 Adapter     1    
276-1221 Head     1    Start By:
Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head" for the correct procedure.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Clean the bottom mating surface of the cylinder head. Check the depth of the valves below the face of the cylinder head before the valve springs are removed.
Place a temporary identification mark on the heads of the valves in order to identify the correct position.Note: Inlet valves have a recess in the center of the head.
Use a suitable lifting device to position the cylinder head with the valve springs upward. The weight of the cylinder head is approximately 65 kg (143 lb).Note: Ensure that the cylinder head is kept on a clean, soft surface in order to prevent damage to the machined face.
Personal injury can result from being struck by parts propelled by a released spring force.Make sure to wear all necessary protective equipment.Follow the recommended procedure and use all recommended tooling to release the spring force.
Illustration 1 g02511756
Install Tooling (A) in position on the cylinder head in order to compress appropriate valve spring (3) .
Ensure that the valve spring is compressed squarely or damage to the valve stem may occur.
Apply sufficient pressure to Tooling (A) in order to remove valve keepers (1) .Note: Do not compress the spring so that valve spring retainer (2) touches valve stem seal (4) .
Slowly release pressure on Tooling (A) .
Illustration 2 g02511676
Place a temporary identification mark on valve spring (3) in order to identify the correct position.
Remove valve spring retainer (2). Remove valve spring (3) .
Repeat Step 4 through Step 8 for the remaining valves.
Remove Tooling (A) .
Remove valve stem seals (4) .
Use a suitable lifting device in order to carefully turn over the cylinder head.
Remove valves (5) .Installation Procedure
Table 3
Required Tools    
Tool