TM 5-3810-300-24&P-3
1.0
SHOP NOTES-TROUBLE SHOOTING-SPECIFICATIONS-SERVICE
TOOLS
SHOP NOTES
PISTON AND CYLINDER LINER USAGE
1. "N" pistons are .030" longer than the "E" pistons and
port cylinder liners can be used with fire ring
approximately .155" longer than the special "E" piston. In
turbocharged pistons.
The standard figure 8 port
addition, the fire ring turbocharged piston is .125" longer
cylinder liner should be used only with the non-fire ring
than the non-fire ring turbocharged piston.
These
two valve piston.
dimension differences dictate that pistons cannot be
mixed in an engine. To do so would result in misfiring
4. Crown valve injectors can be used with the 18.7:1
and a rough idle condition which could ultimately result in
pistons. Crown valve and needle valve injectors must
cylinder liner scuffing.
not be mixed in an engine.
2. The "E" and "turbo" figure 8 cylinder liner has .900 "
5. When converting to "N" pistons (see Item 1), it is
long ports compared to 1.055 " long ports in the oval port
important that the exhaust valve protrusion be measured
liner and .703" long ports in the standard two valve figure
carefully to assure that when fully closed the exhaust
8 port liner. These port dimension differences prohibit
valves do not protrude more than .006 " above the
mixing of cylinder liners in an engine which would result
cylinder head fire deck. Only the "thin" exhaust valve
in a timing differential and compression ratio changes.
inserts (for two valve or four valve heads) which are
.247" /.251" thick can be used with the "N" piston.
3. Only the oval port cylinder liners can be used with
18.7:1 compression ratio pistons. In addition, only oval
TEFLON WRAPPED PIPE PLUG
Pipe plugs with a baked teflon coating are available for
2. Start the tape one or two threads from the small or
service. However, pipe plugs can be hand wrapped
leading edge of the plug, joining the tape together with
satisfactorily with teflon tape to provide a better seal and
an overlap of approximately 1/8 " .
facilitate plug removal. When a teflon wrapped plug is
installed, it is extremely important that the specified
3. Wrap the tape tightly in the same direction as you
torque not be exceeded.
would turn a nut. The tape must conform to the
configuration of the threads (be pressed into the minor
Hand wrap a pipe plug with teflon tape as follows:
diameter of the threads) without cutting or ripping the
tape.
1. Be sure the pipe plug is thoroughly clean and dry
4. Hand tighten and hand torque the pipe plug and do
prior to applying the teflon tape. All dirt, grease, oil and
not exceed the specified torque. Do not use power tools.
scale must be removed.
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