01-27
Engine Service
01-27
SERVICE PROCEDURES (Continued)
8.
Remove fluid from cup and bleed fluid from
tappet by working plunger up and down. This
step will aid in depressing tappet plungers when
checking valve clearance.
9.
If a valve tappet is not within specifications:
l
Replace defective valve tappets with new
ones. It is not necessary to disassemble and
clean new valve tappets to test them since
they are shipped with testing fluid.
Oil Pan
Cleaning
Scrape any dirt or metal particles from the inside of the
oil pan. Scrape all old gasket material from the gasket
surface. Wash the pan in a solvent and dry it
thoroughly. Make sure all foreign particles are
removed.
Inspection
Check the oil pan for cracks, holes or damaged drain
plug threads. Check the gasket surface for damage
caused by over-tightened bolts. Replace with a new oil
pan (6675) if repairs cannot be made.
Cylinder Heads
NOTE: Do not plane or grind more than 0.254mm
(0.010 inch) from original cylinder head gasket
surface.
Replace the cylinder head (6049) if it is cracked.
Remove all burrs or scratches with an oil stone.
Cleaning
With the valves installed to protect the valve seats,
remove deposits from the combustion chambers and
valve heads with a scraper and a wire brush. Be
careful not to damage the cylinder head gasket
surface. After the valves are removed, clean the valve
guide bores. Use cleaning solvent to remove dirt,
grease and other deposits from the valves with a fine
wire brush or buffing wheel.
Inspection
Inspect the cylinder head for cracks or excessively
burned areas in the exhaust outlet ports.
Check the cylinder head for cracks and inspect the
gasket surface for burrs and nicks. Small
imperfections of this type can be dressed down using
an oil stone. Replace the cylinder head if it is cracked.
The following inspection procedures are for a cylinder
head that is to be completely overhauled. For
individual repair operations, use only the pertinent
inspection procedure.
Spark Plug Thread Service
NOTE: The use of power or air driven tools is not
approved for the installation of tapersets.
Damaged spark plug threads in the cylinder head can
be serviced using Rotunda Taperset Installation Kit
107-R0901,
or equivalent.
The procedure involves cutting new threads in the
spark plug hole. After rethreading operation, a tapered
sleeve will be installed in the cylinder head. The sleeve
is threaded on the inside and outside. The outside
threads into the cylinder head while the inside
provides new threads for the spark plug
(12405).
The service is permanent and will have no effect on
cylinder head or spark plug life.
CAUTION:The
cylinder head must be removed
from the engine before installing a taperset.The
service procedure includes a thread cutting
process which produces metal chips. Performing
this procedure while the cylinder head is on the
engine will cause metal chips to fall into the
cylinder. Once in the cylinder, these chips can
damage the cylinder wall when the engine is
started.
SETS
ROTUNDA TAPERSET
INSTALLATION KIT 107-R0901
A24224-A
I.
Thoroughly clean spark plug counter bore, seat
and threads of all dirt or other foreign material.
2.
Start tap into spark plug hole being careful to
keep it properly aligned.
As tap begins cutting new threads, apply oil to
tap.
Continue cutting threads and applying oil until
stop ring bottoms against spark plug seat.
3.
Remove tap. Remove all metal chips using
compressed air.
4.
Coat threads of mandrel with cutting oil. Thread
taperset onto mandrel until one thread of mandrel
extends beyond taperset.
TAPERSET
A23459-A
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