Yanmar 3TNV82A Service Manual page 124

PERIODIC MAINTENANCE
This procedure is considered normal maintenance
and is performed at the owner's expense. This
procedure is not covered by the Yanmar Limited
Warranty.
Inspect Turbocharger (Blower Wash as
Necessary) - 3TNV84T, 4TNV98T, 4TNV84T,
and 4TNV106T
Turbocharger service is required by the EPA / ARB
every 1500 hours. Inspect, clean and blower wash
the unit if necessary (see Periodic Inspection on
page 10-13). If you notice that the engine seems
sluggish or the exhaust color is abnormal NEVER
wait until the next service interval.
Inspect Crankcase Breather System
Proper operation of the crankcase breather system
is required to maintain the emission requirements
of the engine. The EPA / ARB requires that the
crankcase breather system is inspected every 1500
hours.
There are three different crankcase breather
systems used on the TNV engines. Only the non-
turbo TNV engines crankcase breather system
requires periodic maintenance.
The non-turbo TNV engines use a crankcase
breather system that has a spring-backed
diaphragm (Figure 5-19, (1)) in the valve cover
(Figure 5-19, (2)). When the crankcase pressure
reaches a predetermined value, the diaphragm
opens a passage that allows crankcase fumes to
be routed to the intake manifold.
5-38
Periodic Maintenance Procedures
To inspect the diaphragm and spring
(Figure 5-19, (3)):
1. Remove the bolts retaining the diaphragm
cover (Figure 5-19, (4)).
(4)
Figure 5-19
2. Remove the diaphragm cover, spring,
diaphragm plate (Figure 5-19, (5)) and
diaphragm.
3. Inspect the diaphragm for tears. Inspect the
spring for distortion. Replace components if
necessary.
4. Reinstall the diaphragm, diaphragm plate,
spring and diaphragm cover. Tighten the
diaphragm bolts to specified torque.
Failure of the diaphragm and / or spring will cause
the loss of pressure control and allow an excessive
amount of crankcase fumes to be routed to the
intake manifold. This could result in excessive
deposits in the intake system, high engine exhaust
smoke levels, excessive engine oil consumption,
and / or engine run-on due to the burning of the
engine oil.
TNV DI Service Manual
(3)
(5)
(1)
(2)
0002135