Yanmar 3TNV82A-B Service Manual page 130

PERIODIC MAINTENANCE
Proper operation of the fuel injectors is required to
obtain the optimum injection pattern for full engine
performance. The EPA / ARB requires that the fuel
injectors are inspected, cleaned and tested every
1500 hours. See Testing of Fuel Injectors on
page 7-38.
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
, 3TNV84T-Z, 4TNV84T-Z,
4TNV98T-Z
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, Clean and Test EGR Valve
4TNV84T-Z, 4TNV98T-E, 4TNV98-Z, 4TNV98T-Z
The EGR valve is a key component for cleaning
exhaust gas.
To prevent the valve from deteriorating in exhaust
gas recirculation performance due to carbon
accumulation, inspect, clean and test the valve at
least every 1500 hours.
Consult your local Yanmar dealer for this service.
Inspect and Clean EGR Lead Valve
4TNV84T-Z, 4TNV98T-Z
The EGR lead valve is located in the passage of
recirculated gas.
To prevent carbon accumulation in or clogging of
the lead valve, inspect and clean the lead valve at
regular intervals.
Consult your local Yanmar dealer for this service.
5-40
Periodic Maintenance Procedures
Clean EGR Cooler
4TNV84T-Z, 4TNV98T-Z
The EGR cooler is apt to be contaminated with rust
and scale that deteriorate the cooling performance.
Carbon accumulation in the exhaust gas passage
of the cooler hinders circulation of exhaust gas,
resulting in deterioration in exhaust gas cleanup
performance.
To prevent such a problem, clean the cooler at least
every 1500 hours.
Consult your local Yanmar dealer for this service.
EGR cooler
Figure 5-19
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.
TNV DI Service Manual
EGR valve
EGR lead valve