Vedeneyev M-14P, Maintenance Manual

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The set of a tappet (Ref. Pig. 9) includes guide bushing (3), tappet (4), tappet end piece (2), spring
(1), roller (5), roller bushing (6), roller pivot (7).
Tappet (4) is a steel cylindrical rod having a slot, in its lower part with holes for the pivot carrying a
floating bronze bushing and the roller. Installed in the upper part of the tappet is a spring and end piece with
spherical recess for the push rod end.
The tappets, push rod ends, adjustment screws and valve rockers have passages to supply oil to the
valve case mechanisms.
Tappet guide bushing (3) is made of steel, has an oval flange with two holes for securing to the
intermediate crankcase. The guide bushing lower part is made with a slot equal in width to that of the roller
and fixing the latter relative to the cam plate raceway.
The guide bushings of the tappets of inlet valves in cylinders Kos 1, 2, 8 and 9, as well as of the
exhaust valves in cylinders Nos 1, 2, 3, 8 and 9 have slots and holes to supply oil under pressure.
Tappet push rod (1) (Ref. Pig. 10) is made of a seamless steel pipe with steel end pieces having
spherical ends pressed into its bored ends.
Spherical ends of the push rods enter respective recesses of the rocker adjustment screw and the
tappet. Each push rod is arranged in casing (4).
The push rod casing is a thin-walled aluminium pipe flared at one end and having a bead at the other.
All casings and push rods are interchangeable.
The flared end of the push rod casing is attached by union nut (5) to the connection on
the cylinder valve case, while its other end is attached by rubberized fabric hose (2)
with the guide bushing of the tappet.
Thrust tapered ring (6) is installed under nut (5) to press by its surface the end of casing (4) to the
connection. The rubberized fabric hoses are fastened with clamps (3).
Valve rockers (Ref. Pig. 11) serve to transmit motion from the push rods to the valves at opening and
from the valves to the rods at closing of the valves.
The rockers are made of steel forgings and are installed on needle rollers (8) which rest on steel axle
(10) inserted in the cylinder valve case holes. One end of the rocker is forked. The fork has roller (2) mounted
on pivot (3) to transmit force to the valve stem during operation of the engine. The other end of the rocker has
an adjustment screw which is secured by lock nut (7) after the required clearance between the rocker roller
and the valve stem is adjusted.