Yanmar 6CXM-GTE2 Service Manual download pdf (Page 102)

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3.11.12 Disassembly of fuel feed pump

1) Remove the piston spring stopper plug and pull out the

piston spring.

2) Remove the piston.

3) Push the tappet from the opposite side of the plug and

remove the snap ring.

4) Remove the tappet and inter spindle.

5) Loosen the screw at the bottom of the priming pump

and remove the priming pump assembly.

6) Remove the inlet and outlet check valve springs and

check valves.

3.11.13 Inspection after disassembly

1) Block the inlet port of the priming pump with your fin-

ger and push in the piston. If the piston returns by the

spring force, the piston does not have enough negative

pressure. Always replace the priming pump as a set.

2) Check the piston spring for cuts, cracks, uneven wear

and rust.

3) If the piston, inter spindle, or tappet assembly is

extremely worn, replace the part.

4) Check the contact surface of the valve and valve seat

for defects.

5) When there is play between a valve seat and feed

pump body, the whole fuel pump body must be

replaced.

6) Clean the filter screen in cleaning solvent and check it

for damage or clogging. Replace it if damaged.

3.11.14 Assembly of fuel feed pump

Assemble in the reverse order of disassembly.

3.11.15 Inspection after assembly

1) Air leak test

Inspect the air-tightness of each pipe and packing etc.

Especially check the inlet side because air is likely to

enter due to the negative pressure of the suction.

2) Leakage from inter spindle seals

Plug the outlet, apply compressed air at 0.29 MPa

through the outer port, place the feed pump in a fuel

tank and inspect for leakage from the inter spindle

seals. If there are air bubbles, replace the oil seals,

inter spindle or the feed pump body.

3.11.16 Test of fuel feed pump

1) Setting of the pump

Set the fuel feed pump on the injection pump, and

operate the assembled unit on the pump tester.

Fuel piping should be provided directly from the tank,

not through the delivery pump of the tester.

Note:

Play in the valve seat hinders the opening and

closing of the valve, causing insufficient fuel

supply and abnormal wear of the tappets and

camshaft.

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Yanmar 6CXM-GTE2 Service Manual Page 102

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