DISASSEMBLE CYLINDER HEADS

3208 INDUSTRIAL AND MARINE ENGINES

DISASSEMBLY AND ASSEMBLY

CYLINDER HEADS

DISASSEMBLE CYLINDER HEADS

15-1101

Tools Needed

FT806 Cylinder Head Stand

FT967 Adapter Plate

8S2263 Valve Spring Tester

551330 Valve Spring Compressor

8S7170 Valve Seat Insert Puller Group

start by:

a) remove cylinder heads

1. Fasten a hoist and put the cylinder head in

position on tool (A). Use adapter plates (1) from

tooling (A) to hold the head in place.

2. Put tension on the valve springs with tool (C)

and remove the locks.

NOTE: Later engines have only one valve spring and a

spacer instead of the inner spring.

3. Remove tool (C), retainer, springs, washer, and

valve from the cylinder head. Put identification

on the valve as to its location in the cylinder

head.

4. Check the spring force with tool (B). The spring

force for the outer spring is 35 5 lb. (15.9 2.3

kg) when the length of the spring under the test

force is 1.715 in. (43.56 mm). The spring force

for the inner spring (if so equipped) is 16.5 4

lb. (7.4 1.8 kg) when the length of the spring

under the test force is 1.715 in. (43.56 mm).

5. Do Steps 2 through 4 again for the remainder of

the valves.

6. Remove the exhaust valve seat inserts with

tooling (D).

NOTE: The valve guides are part of the cylinder head.

Measure the bore in each valve guide .75 in. (19.0 mm)

from the outside edge on both ends of each valve guide.

The bore must be .3745 .0005 in. (9.512 0.013 mm).

The maximum permissible bore is .3760 in. (9.550 mm).

Valve guides worn more than the maximum

specification can be made to the original size by

knurling.