PERIODIC MAINTENANCE
5-24
TNV IDI Service Manual
Periodic Maintenance Procedures
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 5-18, (1)) in the valve cover
(Figure 5-18, (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.
Figure 5-18
To inspect the diaphragm and spring
(Figure 5-18, (3)):
1. Remove the bolts retaining the diaphragm cover
(Figure 5-18, (4)).
2. Remove the diaphragm cover, spring,
diaphragm plate (Figure 5-18, (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 the specified torque. See
Tightening Torques for Standard Bolts and Nuts
on page 4-26.
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_IDI_ServiceManual_A4.book 24 ページ ２０１２年２月２４日 金曜日 午前１０時２４分
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