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 AIR INLET AND EXHAUST SYSTEM
TESTING AND ADJUSTING
EXHAUST TEMPERATURE
Valves
Valve removal and installation is easier with use
of the IP3527 Valve Spring Compressor Assembly.
Valve Seat Inserts
To remove and install valve seat inserts, use the
6V4805 Valve Seat Extractor Group. For installation,
lower the temperature of the insert before it is installed in
the head.
Valve Guides
Tools needed to remove and install valve guides
are the 5P1729 Bushing and 7M3975 Driver. The
counterbore in the driver bushing installs the guide to the
correct height. Use a I P7451 Valve Guide Honing
1P3060 PYROMETER GROUP
Group to make a finished bore in the valve guide after
installation of the guide in the head. Special Instruction,
Use the IP3060 Pyrometer Group to check
Form No. SMHS7526 gives an explanation for this
exhaust temperature. Special Instruction, Form No.
procedure. Grind the valves after the new valve guides
SMHS7179 is with the tool group and gives instructions
are installed.
for the test procedure.
Checking Valve Guide Bores
CRANKCASE (CRANKSHAFT
COMPARTMENT) PRESSURE
Use the 5P3536 Valve Guide Gauge Group to
check the bore of the valve guides. Special Instruction,
Pistons or rings that have damage can be the
Form No. GMG02562 gives complete and detailed
cause of too much pressure in the crankcase. This
instructions for use of the 5P3536 Valve Guide Gauge
condition will cause the engine to run rough. There will
Group.
also be more than the normal amount of fumes coming
from the crankcase breather. This crankcase pressure
can also cause the element for the crankcase breather to
have a restriction in a very short time. It can also be the
cause of oil leakage at gaskets and seals that would not
normally have leakage.
COMPRESSION
An engine that runs rough can have a leak at the
valves, or have valves that need adjustment. Removal
of the head and inspection of the valves and valve seats
is necessary to find those small defects that do not
normally cause a problem. Repair of these problems is
normally done when reconditioning the engine.
CYLINDER HEADS
The cylinder heads have valve seat inserts,
valve guides and bridge dowels that can be removed
when they are worn or have damage. Replacement of
these components can be made with the tools that
follow.
SP3536 VALVE GUIDE GAUGE GROUP
134
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