Great Wall engine 4G64S4M. Manual — part 12
11-42
ENGINE
CYLINDER HEAD AND VALVE
bracket side
6EN0591
DEN0711
6LU0013
Inspection
Front Cover
(1)
Check whether the oil hole is blocked, and clean it where
necessary.
(2)
Inspect whether there is abrasion, damage or sintering at the
front bearing of left balancing shaft, if any, change the front
cover.
(3)
Check whether the front cover has crack or other damages, if
it has, change the front cover assembly.
Oil Seal
(1)
Check whether the lip of oil seal has abrasion or damage.
Change the oil seal if necessary.
(2)
Check whether the lip of oil seal has deterioration. Change the
oil seal where necessary.
Balancing Shaft
(1)
Check whether the oil hole is blocked.
(2)
Inspect whether the journal has sintering or damage, or
whether it interferences with the bearing. Change the balanc-
ing shaft, bearing or the front cover assembly in case any
defect is found.
Lubricating Oil Pump
(1)
Mount the gear of oil pump on the front cover, and then rotate
the gear to check whether it can runs smoothly and fixedly.
(2)
Ensure the contact face of the front cover and the gear flanks
of oil pump cover has no lophodont abrasion.
(3)
Check the side clearance.
Standard value:
Driving gear: 0.08-0.14mm
Driven gear: 0.06-0.12mm
Piston and Connecting Rod
Mount of Oil Filter
(1)
Clean the mounting face of the oil filter bracket.
(2)
Coat the engine oil on the O-ring of oil filter.
(3)
Screw in the oil filter, when the O-ring contacts the mounting
face, screw another 3/4 round (tightening moment: 1.4 kg.m)
N
11-43
ENGINE
CYLINDER HEAD AND VALVE
DISASSEMBLY AND ASSEMBLY
Disassembly Procedure
1. connecting rod nut
2. connecting rod cap
3. connecting rod bearing
4. piston and connecting rod cluster
5. connecting rod bearing
6. first air ring
7. second air ring
8. oil ring
9. piston pin
10. piston
11. connecting rod
12. connecting rod bolt
All inside parts must be
coated with engine oil
6EN0526
G
F
A
E
D
E
C
C
B
A
B
11-44
ENGINE
CYLINDER HEAD AND VALVE
Main Points in Disassembly
Disassembly of Connecting Rod Cap
(1)
Mark the cylinder No. on the side face of the larger end of the
connecting rod so as to ensure the correct assembly.
(2)
Put aside the dismantled connecting rod, connecting rod cap
and connecting rod bearing in order as per the cylinder No.
marked on.
Disassembly of Piston Pin
(1)
Insert the SST of compression bar from the side with arrow
mark at the piston top, then mount the guide block C at the end
of compression bar.
(2)
Keep the mark for forward face of the piston to face upwardly,
and mount the piston and connecting rod cluster on the base
seat (SST) of the assembler of piston pin.
(3)
Press the piston pin out with the pressure.
Notice:
Put aside the dismantled piston, piston pin and connecting
rod as per the cylinder No. marked on.
A
B
cylinder No.
DEN0050
Assembler for Piston Pin MD998780
pressing rod guide block B
conduit A=17.9mm
conduit A=18.9mm
conduit A=20.9mm
conduit A=21.9mm
guide block C
base seat
pressing rod
mark for forward
face
guide block C
base seat
mark for
f o r w a r d
face
7EN0390
7EN0431
11-45
ENGINE
CYLINDER HEAD AND VALVE
Main Points for Mount
Mount of Piston Pin
(1)
Measure the following dimensions of the piston, piston pin
and connecting rod;
A) Length of inserting hole of the piston pin;
B) Width between the keyway
C) Length of piston pin
D) Width of smaller end of connecting rod.
(2)
Calculate the dimension L by substituting the letters in the
below formula with the measured dimensions:
L
[(A C)(B D)] / 2
(3)
Insert the SST of compression bar in the piston pin and mount
the conduit A at the end of compression bar.
(4)
Conduct the assembly in such way that the mark for forward
face on the piston is in the same direction with that of the
connecting rod.
(5)
Coat the engine oil on the outside diameter of the piston pin.
(6)
Encase the piston pin, connecting rod and conduit cluster
assembled as Step (3) in the piston pin hole at the side with
mark for forward face with conduit A.
(7)
Screw the guide block B in the conduit A and ensure the
clearance between the guide block B and the guide block A is
the value of the sum of L calculated in Step (2) plus 3 mm..
(8)
Maintain the state that the mark for forward face of piston
faces upwardly, and mount the piston and connecting rod
cluster on the base seat of the assembler of piston pin.
(9)
Press in the piston pin with pressure. If the pressure force is
less than the standard value, Change the piston pin and the
piston cluster, or/and change the connecting rod.
Standard value: 750
1750kg
A
piston
piston pin
connecting rod
A
B
C
D
7EN0432
3mm+L
guide block B
conduit A
7EN0433
compression bar
piston pin
mark for forward face
mark for
f o r w a r d
face
conduit A
conduit B
base seat
7EN0391
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