This article mainly introduces DooSan Diesel Engline D18NAP Injector Disassembly
1. Remove the breather hose
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CAUTION
Do not reuse the clamps but replace with new ones.
2. Remove the common rail and the injection pipes
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1) Loosen the fixing bolt (E).
2) Loosen the nuts of the fuel injection pipes.
3) Remove 4 fuel injection pipes (C) and (D)
CAUTION
Do not reuse fuel injection pipes; replace them
with new ones. If fuel injection pipes are reused
it may allow foreign substances into the fuel
pipes or cause oil leaks from bolt clamping and
cause a critical fault in engine performance.
4) Loosen 2 collared hex bolts (B) of the common rail.
5) Remove the common rail (A) from the intake
manifold.
3. Remove the glow plug.
1) Loosen 3 hex nuts (D) and remove 3 washers (C).
2) Remove the electric connector (B) and 3 glow
plugs (A).
4. Remove the fuel return hose
1) Loosen the flange hex bolts (C).
2) Remove the hose clips and disconnect the fuel
hose (A)
5. Remove the right and left cylinder head cover.
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1) Loosen 8 flange hex bolts (D).
2) Remove the right cylinder head cover (C).
3) Loosen 10 flange hex bolts (B).
4) Remove the left cylinder head cover (A).
6. Remove the injectors
1) Loosen 3 hex bolts (D).
2) Remove 3 injector fixtures (C).
3) Remove 4 injectors (B).
4) Remove 3 injector seal ring washers (D)
CAUTION
• Do not reuse the head cover rubber seal and
the injector oil seal but replace with new
ones.
• Be careful not to damage the injector oil seal
of the cylinder head cover.
• Remove it by turning the injector slowly from
left to right
