Doosan G20P-5, Service Manual

Page: 75 / 306

G424F(FE) Service Manual Chapter 3. Engine Mechanical System 73
Important
• The Tensioner roller lug (1) should be positioned
in the guide housing (2) of the oil pump case.
12.
Crankshaft timing pulley and attaching bolt,
without tightening.
13.
With a 17-mm socket and torque wrench.
Tighten
• Bolts: 135 + 30° + 15° (99 lb
·
ft. + 30° + 15°).
14.
Timing pulley rear cover; see “Timing Pulley
Rear Cover – Installation”, in this section.
Oil Pump Assembly
Disassemble
1.
Remove the oil pump; see “Oil Pump – Removal”,
in this section.
2.
Pump cover, with a proper posi-drive screwdriver.
3.
Drive gear.
4.
Driven gear.
5.
Oil pressure switch, with a 26-mm wrench.
6.
Oil filter gallery plug, with a 19-mm combination
wrench.
7.
Relief valve plug, with a 24-mm combination
wrench.
8.
Sealing washer.
9.
Spring.
10.
Valve plunger.
Clean
• All pump parts.
Inspect
• Parts for wear.
Measure
Play between the following parts:
• Driven gear and case, which should be 0.11 –
0.19 mm.
• Drive gear and crescent, which should be 0.35 –
0.45 mm.
• Gear and cover, which should be 0.03 – 0.10
mm.
Assemble
1.
Plunger in the valve. (1)
2.
Spring. (2)
3.
Sealing washer. (3)
4.
Relief valve plug, with a 24-mm socket wrench
and torque wrench.(4)
Tighten
• Valve plug: 45 – 60 N
•
m (33 – 44 lb
•
ft).
5.
Driven gear. (5)
6.
Drive gear. (6)
7.
Oil pump cover and attaching screws, with a posi-
drive screwdriver. (7)
8.
Oil pump gallery plug, with a torque wrench. (8)
Tighten
• Gallery plug: 30 – 35 (22 – 25,7 lb
·
ft)
9.
Oil pressure switch, with a 26-mm socket and
torque wrench.