Westerbeke 20B TWO Tehnical Manual page 62

Injection Nozzle Removal
1. Disconnect the injection pipe and fuel return pipe.
2. Remove the injection nozzle assembly from the cylinder head.
CAUTION
Attach an identification number tag to the removed injection nozzle. Plug the openings from
which the pipes are disconnected and the nozzle is removed to prevent intrusion of dust,
water, and other foreign particles into the pipes and combustion chamber.
Injection Nozzle Disassembly
If the removed nozzle assembly is assumed defective, disassemble the assembly and repair or replace the
faulty parts.
1. Grip the nozzle holder body in a vise. Loosen the retaining nut. Never vise the retaining nut to prevent
deformation.
2. Take out the shim washer, pressure spring, distance piece, and nozzle assembly.
CAUTION
Scrape off carbon deposits with a wooden spatula. Keep the removed parts immersed in
washing oil (kerosene). Take special care not to scratch the needle valve in the nozzle
assembly.
Injection Nozzle Inspection
Inspect the removed parts. If any part is found defec-
tive, replace it.
Injection Nozzle Assembly
1. Insert the nozzle assembly into the retaining nut so
that the nozzle is perfectly seated in the nut.
2. Place the distance piece, retaining pin, pressure
spring, and shim washer on the nozzle assembly.
3. Tighten the nozzle holder body fully by hand.
4. Grip the nozzle holder in a vise. Tighten the retain-
ing nut to the specified torque.
Tightening torque: 3.5 - 4.0 kgm
Westerbeke Engines
60
~
. Fatigue and
!gl/
break
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@
Poor contact
~
~
9
Inspecting Nozzle
~T
Deformation
and break
While immersed
in kerosene.
check for smooth
sliding.