Figure 3-2. Cylinder compression relief valve

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Figure 3-1. Cylinder head removal and installation.

TM-55-1925-204-12 TUG Harbor Diesel 1200 H. P. Steel 100 Ft Design 3006 Flight One FSN 1925-375-3003 Manual

Figure 3-3. Cylinder head valves.

Figure 3-2. Cylinder compression relief valve

(9) Back off the cap bolts holding the water

the connecting plate has been

manifold to the cylinder head and the cylinder block.

removed.

Lift off the water manifold and store in a safe place.

(12) Place two eye bolts in the threaded holes

NOTE

provided for this purpose -in the cylinder head. Position

Before removing head stud nuts,

a chain hoist over the cylinder head to be removed.

Using a wire sling, make fast to the chain hoist hook and

mark position of the stud nuts by

the eye bolts. Hoist the cylinder head clear of the

making a small punch mark on the

cylinder block studs. Move the cylinder head to a

cylinder head and a punch mark on

working area. Set the cylinder head on wooden blocks

the head stud nut. When the cylinder

or a plank.

head is installed, draw down on the

(13) The compression relief valve can now be

stud nuts until the punch marks line

removed. Back off the cap bolts holding compression

up to insure proper seating. Punch

relief valve cage to the cylinder head, and lift

mark each head stud nut and stud

compression relief valve from the cylinder head. Store

starting from one to eight. It is

in a safe place.

important that the head stud nuts be

(14) Remove the cylinder head gasket.

returned to the same stud from

NOTE

which it was removed.

Use new gaskets when installing the

(10) Back off head stud nuts and tag them with

cylinder head.

the number of the cylinder from which removed

c. Cleaning, Inspection, and Repair.

(11) Back off the two head stud nuts on the

(1) Clean carbon deposits from the cylinder

adjoining cylinder head to remove the connecting plate

head. Use a wire brush on stubborn deposits, then blow

(plate connecting cylinder head to the adjoining cylinder

clean with ships service air.

head). Lift off the connecting plate and store in a safe

(2) Inspect the combustion chamber portion

place. Return the head stud nuts to the corresponding

of the cylinder head for minute cracks. When defects

studs on the adjoining cylinder and tighten.

are found report them to general support maintenance,

NOTE

or replace the head with a new one.

When al cylinder heads are to be

(3) Inspect the water coolant passages in the

removed for overhaul, it will not be

cylinder head for clogging scale. Scrape it clean then

necessary to replace the head stud

blow out with ships service air.

nuts on the adjoining cylinder after

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