Vedeneyev M-14P, Maintenance Manual

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112
TO M-14P M.S. TASK CARD No. 247
M.S ITEM
072.30.00f procedure: Check of Clearance between Rocker Rollers
and Valve Stem Ends
OPERATIONS AND TECHNICAL REQUIREMENTS CORRECTIVE ACTIONS
CH
ECKED BY
1. Lift the cable tensioning wing nuts upwards. 2. Remove the cables and. valve case
covers.
3. Undo the union nuts for attachment of ignition cable elbows to front spark plugs.
4. Drive out the front spark plugs (Ref. 074.20.02, Task Card Ho. 201). 5. Turn the engine
crankshaft by the airscrew in its normal direction.
6, Set the piston to the compression stroke TDC in cylinder Mo. 1.
NOTE: With such a position of the piston in cylinder No. 1 both valves should be
closed and the rockers should move easily by hand.
7. Push the rocker arm on the adjustment screw side and check clearance between the
rocker roller and the inlet valve stem with a feeler gauge.
8. Also check a clearance between the roller and the stem of the exhaust valve«
T.R. Clearance should be (0,3
+0,15
-0,10
) mm on the cold engine. If clearance
is more than 0.45 mm or less than 0.2 mm, readjust it to set 0.3 mm, 9. Undo the
adjustment screw locking nut for 1 to 1.5 turns.
Adjust clearance as in-
structed in Items 9 through 12