Toyota 1PZ Repair Manual page 158

FUEL SYSTEM Injection Nozzles (1 HD-T)
(b) Using a wooden stick, remove the carbon adhering to
(c) Using a brass brush, remove the carbon from the
(d) Check the seat of the nozzle body for burns or
(e) Check the nozzle needle tip for damage or corrosion.
If any of these conditions are present, replace the nozzle
assembly.
2. INSPECT NOZZLE ASSEMBLY
(a) Wash the nozzle in clean diesel fuel.
HINT: Do not touch the nozzle mating surfaces with your
fingers.
(b) Tilt the nozzle body about 60 degrees and pull the
(c) When released, the needle should sink down into the
(d) Repeat this test, rotating the needle slightly each time.
If the needle does not sink freely, replace the nozzle
assembly.
the nozzle needle tip.
exterior of the nozzle body (except lapped surface).
corrosion.
needle out about one third of its length.
body vent smoothly by its own weight.
FU-19