Valve Springs; Push Rods; Valve Seats - Tecumseh V-twin Technician's Handbook

VALVE SPRINGS

Specification English Std.
Valve Spring 1.935 - 1.995
Free Length
The valve springs should be checked for both ends being
parallel and the free length being 1.935/1.995 (49.15/
50.67 mm). Replace the springs if less than the
specification. (Illust. 7-16)
The valve springs are progressively wound. Meaning one
end of the spring has the coils closer together. When
installing the valve spring these coils must be opposite
the cap and retainer. (Illust. 7-17)
7-6

PUSH RODS

The push rods should be checked for straightness and
the ends for wear. If the push rod ends are worn or
Metric
damaged, inspect the corresponding rocker arm socket
or valve lifter for wear. Replace if necessary.
49.15 - 50.67

VALVE SEATS

Valve seats are not replaceable. If they are burned, pitted,
or distorted they can be reconditioned using a grinding
stone or a valve seat cutting tool. Valve seats are ground
to a width of 3/64" (1.191 mm) at 46 degrees.
The recommended procedure to properly cut a valve seat
is to use the Neway Valve Cutting System, which consists
of three different cutters.
First, use the 60 degree cutter to clean and narrow the
seat from the bottom to the center. (Illust. 7-18)
NARROWING
7-16
NARROWING
Second, use the 31 degree cutter to clean and narrow
the seat from the top toward the center. (Illust. 7-19)
CLOSE COILS
TOWARD HEAD
SEAT
7-17
BOTTOM
CUTTER
60
0
BOTTOM
TOP NARROWING
CUTTER
SEAT
7-18
31
0
7-19