DETROIT DIESEL 53
1.2.2 Exhaust Valves
The cylinder head must first be removed before the
exhaust valves, valve seat inserts or valve guides can
be removed for replacement or reconditioning.
However, the valve springs may be replaced without
removing the cylinder head.
Remove Exhaust Volvo Spring (Cylinder Hood
Installed)
An exhaust valve spring may be removed, without
removing the cylinder head from the engine, as
follows:
1. Clean and remove the valve rocker cover.
2. Crank the engine over to bring the valve and
injector rocker arms in line horizontally.
3. Disconnect and remove the fuel pipes from the
injector and the fuel connectors.
CAUTION: Immediately after removing the fuel
pipes. cover each injector opening with a
shipping cap to prevent dirt or other foreign
matter from entering the injector.
Fig. 4 - Cleaning Valve Guide
4. Remove the two bolts holding the rocker arm shaft
brackets to the cylinder head and remove the brackets
piston travel may be observed, then turn the
and shaft.
crankshaft until the piston is at the top of its stroke.
5. Remove the cylinder block air box cover so that the
6. Thread the spring compressor tool into one of the
rocker arm support bolt holes (Fig. 2). Then compress
the spring and remove the two-piece valve lock.
7. Release the tool and remove the valve spring cap,
valve spring and spring seat.
Remove Exhaust Valves and Valve Springs
(Cylinder Head Removed)
With the cylinder head removed from the engine,
remove the exhaust valves and springs as follows:
1. Support the cylinder head on 2 " thick wood blocks
to keep the cam followers clear of the bench.
2. Disconnect and remove the fuel pipes from the
injectors and the fuel connectors.
CAUTION: Immediately after removing the fuel
pipes, cover each injector opening with a
shipping cap to prevent dirt or other foreign
matter from entering the injector.
Fig. 3 - Testing Valve Spring
3. Remove the two bolts holding the rocker arm shaft
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