ENGINE DIAGNOSTIC TEST PROCEDURES
MEASURE SMOKE INTENSITY (Continued)
10. Determine Bosch smoke number and compare with
Bosch number specified in Performance Data
11. If smoke emission sample exceeds published limit
correct as required.
NOTE: Filter discs to be evaluated should show no
signs of water drops or soot spots. Avoid excessive
handling and particularly touching darkened surface
as much as possible.
Smoke Meter Maintenance
Soot deposits must be periodically cleaned from
sampling hose and probe, depending on use and
smoke densities encountered. Detach sampling
hose from pump by loosening knurled nut. Blow
compressed air through hose and probe.
Remove shield from probe and seal off end and
side holes with a short piece of tight-fitting hose
which is plugged on one end.
Insert and clamp a filter disc in place.
Cock the pump and release in the normal
Time plunger movement for its full stroke. A
time of 10 seconds or longer indicates filter
clamping is satisfactory.
Periodic inspection of pump seal:
Insert and clamp a rubber disc in filter holder.
release pump, making sure to
perceptible movement of pump piston indicates
satisfactory pump seal.
Periodic pump cleaning.
Abnormal force required to operate pump
indicates need for cleaning.
Disassemble, clean, lubricate pump cylinder,
reassemble and check for leaks.
OIL BURNER SMOKE SCALE
DEVELOPED IN COOPERATION WITH
SHELL DEVELOPMENT COMPANY
This scale is based on a test flue gas
volume of 2250 cubic Inches per square
inch of filtering area, which is equivalent to
6 full strokes for models RZB and RAC
Testers and 10 full strokes for Models
RCC and RCC-B Testers. For motor
operated smoke meter see instructions for
This Scale Conforms to ASTM D 2156-63T
Bahoroach Instrument Co.
Pittsburgh Pa., U.S.A.
Made in U.S.A.
*Chart C compares darkness of filter paper to
Robert Bosch Smoke Number.
Printed in United States of America