The Continental
L-head (flat head) engines used in material handling applications,
lift trucks, tow tractors, welders, etc. have had a tendency
to pump oil past the valve guides. We have found that this can
be overcome by using Hastings P.S. valve seals.
We
are finding that some of the replacement guides are not held
to close tolerances as far as stem to guide clearances are
concerned, and even when clearances are at specifications
there is valve guide oil consumption.
These engines have full main line oil
pressure from the oil pump fed directly to the lifters. This
results in a heavy oil spray in the valve guide area, particularly
as wear occurs and lifter to lifter bore clearances increase.
When these engines are in the process
of being rebuilt, the valve guides, of course, should be replaced.
By making a fixture, or carefully retaining in a vise, the
new guide can be machined for installation of the proper P.S.
valve seal for the application. The proper seal, although
not listed in Hastings catalog applications, can be determined
by matching the proper valve stem size with the seal stem
diameter. Then find the next size smaller seal housing than
the valve guide outside diameter measures.
Do this
by using the P.S. seal set contents chart on the back page of
the P.S. seal catalog. Then, taking into account the number
of cylinders the engine has, you can quickly determine which
seal set to use. The chart will also show the necessary machining
tool for each set installation. The P.S. 6 & 7 Valve Seal
sets and 1756 Machining Tool apply to the lift truck engines
in most cases. These engines would include the 227, 226, 245,
145, 163, 135, and 244.
After
machining, the guides are pressed into the engine block in
the normal manner. While the block is still disassembled the
seals are tapped into place on the guides through the corresponding
lifter bore. The engine is then assembled in the specified
manner.
The new guides may be installed in
their original condition or be knurled for longer life. The
seal effectively stops oil consumption past the guides, without
danger of complete loss of the necessary valve stem lubrication.
On Engine Models
124, 140, 145, 162, 163
Use Tool No. 1756 for P.S. 6
On Engine Models
186, 209, 226, 227, 244, 245
Use Tool No. 1756 for P.S. 7
