Installation Of Exhaust Sampling Port - Yanmar 4JH45 Operation Manual

PERIODIC MAINTENANCE
Inspection and Maintenance
See Inspection and Maintenance of EPA Emission-Related Parts on page 83 for the EPA
emission-related parts. Inspection and maintenance procedures not shown in Inspection
and Maintenance of EPA Emission-Related Parts on page 83 are covered in Periodic
Maintenance Schedule on page 81 .
This maintenance must be performed to keep the emission values of your engine in the
standard values during the warranty period. The warranty period is determined by the age
of the engine or the number of hours of operation.

Installation of Exhaust Sampling Port

All engines subject to emission standards shall be equipped with a connection in the
engine exhaust system that is located downstream of the engine, and before any point at
which the exhaust contacts water (or any other cooling / scrubbing medium), for the
temporary attachment of gaseous and / or particulate emissions sampling equipment. This
connection shall be internally threaded with standard pipe threads of a size not larger than
12.7 mm (0.5 in.), and shall be closed by a pipe plug when not in use. Equivalent
connections are allowed.
The instructions for the proper installation and location of the required sample port, in
addition to those specified above in the quoted federal regulation, are as follows:
1. The connection should be located as far downstream as reasonably practicable from
any sharp bend (of 30 degrees or more) in the exhaust pipe to help ensure that a
well-mixed exhaust flow sample may be taken;
2. The requirement that the connection be located before any point at which the exhaust
contacts water (or any other cooling / scrubbing medium) does not include contact with
water used to cool exhaust manifolds, unless the water is allowed to come into direct
contact with the exhaust gases;
3. To allow ready access to the sample port, the connection should be located, if possible
given the constraints of vessel design, approximately 0.6 to 1.8 m (2 to 6 ft) above a
deck or walkway;
4. To facilitate insertion and withdrawal of an exhaust sample probe, there should be no
obstructions for at least one and one-half exhaust pipe / stack diameters
perpendicular, i.e., 90 degrees, from the sample port; and
5. If a threaded connection is used, both the internal and external threads should be
coated with a high-temperature, anti-seize compound before the initial installation and
at every subsequent re-installation to facilitate removal of the connection for testing.
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JH Series Operation Manual