Yanmar 6CXM-GTE2 Service Manual download pdf (Page 90)

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3.11.8 Inspection of fuel injection pump

(1) Inspection of plunger

1) Thoroughly wash the plungers, and replace the plung-

ers that have scratches on the plunger lead or are dis-

colored.

2) The plunger is in good condition if it slides down

smoothly when it is tilted at about 60q.

Turn the plunger and try this test several times. If the

plunger slides down too quickly or stops part way,

repair or replace it.

(2) Inspection of delivery valve

1) Clean the delivery valve well before inspection.

Replace as a set if the collar or seat of the delivery

valve is scratched, scored, scuffed, worn etc.

2) The valve is good if it returns smoothly when released

after being pushed down with your finger. (While the

hole at the bottom of the delivery guide seat is cov-

ered.) Replace it if necessary. Likewise, the valve

should completely close by its own weight when you

take your finger off the hole at the bottom of the deliv-

ery guide sheet.

(3) Inspection of pump housing

1) Inspect the sliding surface against the tappet guide for

extreme wear. Scratches on the sliding surface against

the roller pin are not a problem.

2) If there are burrs or discoloration, repair or replace the

body as this will lead to dilution of the lubricant.

(4) Inspection of fuel camshaft and bearings

1) Fuel camshaft

Inspect for scratches or wear of cam surface, deforma-

tion of key grooves and screw on both ends. Replace it

if necessary.

2) Replace the bearings if the outer race surface are

flaked or worn.

(5) Inspection of tappet

1) Inspect the surface of the tappet, roller and roller pin

for wear or damage. Replace it if necessary.

2) Measure the clearance between the roller and pin.

Replace them if the clearance exceeds 0.2mm.

(6) Inspection of rack and pinion

Inspect the rack and pinion for wear and burrs on tooth

surface. Replace them if necessary.

(7) Inspection of plunger spring and delivery valve

spring

Inspect the spring for scratches, cracks, breakage,

uneven wear and rust. Replace it if necessary.

(8) Inspection of setting screws

Inspect all setting screws and bolts for wear or damage.

Replace it if necessary.

(9) Inspection of oil seal

Inspect the oil seal lips for wear or damage. Replace it if

necessary.

Note:

When fitting new parts, wash with diesel oil and

perform the above inspection.

Note:

Replace the fuel camshaft and bearings together.

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Yanmar 6CXM-GTE2 Service Manual Page 90

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