Measuring And Adjusting Valve Clearance - Yanmar 3TNV82A Service Manual

ENGINE
Reassembly of the Valve Cover
1. Lightly grease a new valve cover gasket
(Figure 6-73, (6)). Place the gasket in the
groove of the valve cover (Figure 6-73, (3)).
2. Place the valve cover on the cylinder head.
3. Be sure new O-rings (Figure 6-73, (5)) are
installed on the valve cover nuts. Reinstall and
tighten the valve cover nuts (Figure 6-73, (4)).
(2)
(1)
Figure 6-73
4. Reinstall the fuel injector grommets
(Figure 6-73, (1)).
5. Reinstall the exhaust manifold using a new
gasket. Tighten the bolts to specification.
6. Reinstall the intake manifold using a new
gasket. Tighten the bolts to specification.
7. Reconnect the fuel injector return hose and fuel
injection pump coolant hoses.
8. Reinstall the high-pressure fuel line grommets
into the valve cover.
6-60
(3)
(4)
(5)
(6)
0001877

Measuring and Adjusting Valve Clearance

9. Reinstall the high pressure and fuel return lines.
See Installation of the Fuel Injectors on
page 7-37.
10. Reinstall the coolant pump. See Reassembly of
Engine Coolant Pump on page 8-11.
11. Reinstall the alternator. See Installation of
Alternator on page 12-16.
12. Reconnect the turbocharger oil supply and
drain lines.
13. Reconnect the air intake hose.
MEASURING AND ADJUSTING
VALVE CLEARANCE
Measure and adjust while the engine is cold.
Notes:
• The No. 1 piston position is on the flywheel end
of the engine, opposite the radiator. The firing
order is 1-3-2 for 3-cylinder engines and
1-3-4-2 for 4-cylinder engines.
• 3-cylinder engines fire every 240° of crankshaft
rotation.
• 4-cylinder engines fire every 180° of crankshaft
rotation.
• Valve clearance of both the intake and exhaust
valves can be checked with the piston for that
cylinder at top dead center (TDC) of the
compression stroke. When a piston is at TDC
of the compression stroke, both rocker arms
will be loose and the cylinder TDC mark on the
flywheel will be visible in the timing port of the
flywheel housing.
• If there is no valve clearance, and the cylinder
is at TDC of the compression stroke, extreme
wear, or damage to the cylinder head or valves
may be possible.
TNV DI Service Manual