Page 1969 of 3371
EM-86Revision: August 2007
CYLINDER BLOCK
2004 QX56
When Cylinder Block and Crankshaft are Reused
1. Measure inside diameter of cylinder block main bearings housing and outside diameter of crankshaft jour-
nal.
2. Apply measurement in above step 1 to "Main Bearings Selection Table".
3. The following steps are same as in “When New Cylinder Block and Crankshaft are Used”.
Refer to EM-85
.
Main Bearings Selection Table (No. 1 and No. 5 journal)
WBIA0608E
Page 1970 of 3371
CYLINDER BLOCK
EM-87
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
Main Bearings Selection Table (No. 2, 3 and 4 journal)
WBIA0609E
Page 1971 of 3371

EM-88Revision: August 2007
CYLINDER BLOCK
2004 QX56
Main Bearings Grade Table (All Journals)
Unit: mm (in)
Use Undersize Bearing Usage Guide
Use undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
When using undersize (US) bearing, measure inside diameter of bearing installed and grind journal until
oil clearance falls within specification.
Bearing undersize table
Unit: mm (in)
CAUTION:
Do not damage fillet R when grinding crankshaft journal in
order to use undersized bearing (All journals).
Grade number UPR/LWR Thickness Identification color Remarks
0 — 2.483 - 2.486 (0.0978 - 0.0979) Black
Grade is the same for upper
and lower bearings. 1 — 2.486 - 2.489 (0.0979 - 0.0980) Brown
2 — 2.489 - 2.492 (0.0980 - 0.0981) Green
3 — 2.492 - 2.495 (0.0981 - 0.0982) Yellow
4 — 2.495 - 2.498 (0.0982 - 0.0983) Blue
5 — 2.498 - 2.501 (0.0983 - 0.0985) Pink
6 — 2.501 - 2.504 (0.0985 - 0.0986) Purple
7 — 2.504 - 2.507 (0.0986 - 0.0987) White
8 — 2.507 - 2.510 (0.0987 - 0.0988) Red
01UPR 2.483 - 2.486 (0.0978 - 0.0979) Black
Grade and color are different
for upper and lower bearings. LWR 2.486 - 2.489 (0.0979 - 0.0980) Brown
12UPR 2.486 - 2.489 (0.0979 - 0.0980) Brown
LWR 2.489 - 2.492 (0.0980 - 0.0981) Green
23UPR 2.489 - 2.492 (0.0980 - 0.0981) Green
LWR 2.492 - 2.495 (0.0981 - 0.0982) Yellow
34UPR 2.492 - 2.495 (0.0981 - 0.0982) Yellow
LWR 2.495 - 2.498 (0.0982 - 0.0983) Blue
45UPR 2.495 - 2.498 (0.0982 - 0.0983) Blue
LWR 2.498 - 2.501 (0.0983 - 0.0985) Pink
56UPR 2.498 - 2.501 (0.0983 - 0.0985) Pink
LWR 2.501 - 2.504 (0.0985 - 0.0986) Purple
67UPR 2.501 - 2.504 (0.0985 - 0.0986) Purple
LWR 2.504 - 2.507 (0.0986 - 0.0987) White
78UPR 2.504 - 2.507 (0.0986 - 0.0987) White
LWR 2.507 - 2.510 (0.0987 - 0.0988) Red
Undersize Thickness
0.25 (0.0098) 2.618 - 2.626 (0.1031 - 0.1034)
Fillet R : 1.5 - 1.7 mm (0.059 - 0.067 in)
PB I C 0 111E
Page 1972 of 3371

CYLINDER BLOCK
EM-89
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
Inspection After DisassemblyEBS00ILZ
CRANKSHAFT END PLAY
Measure the clearance between the thrust bearings and the
crankshaft arm when the crankshaft is moved fully forward or
backward using suitable tool.
If the measured value exceeds the repair limit, replace the thrust
bearings, and measure again. If it still exceeds the repair limit,
replace the crankshaft also.
CONNECTING ROD SIDE CLEARANCE
Measure side clearance between connecting rod and crankshaft
arm using suitable tool.
If the measured value exceeds the repair limit, replace the con-
necting rod bearings, and measure again. If it still exceeds the
repair limit, replace the crankshaft also.
PISTON AND PISTON PIN CLEARANCE
Piston Pin Hole Diameter
Measure the diameter of piston pin hole using suitable tool.
Piston Pin Diameter
Measure diameter of piston pin using suitable tool.Standard : 0.10 - 0.26 mm (0.0039 - 0.0102 in)
Limit : 0.30 mm (0.0118 in)
PBIC0 114 E
Standard : 0.20 - 0.40 mm (0.0079 - 0.0157 in)
Limit : 0.40 mm (0.0157 in)
PBIC0 115 E
Standard : 21.993 - 21.999 mm (0.8659 - 0.8661 in)
PBIC0 116 E
Standard : 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0 117 E
Page 1973 of 3371

EM-90Revision: August 2007
CYLINDER BLOCK
2004 QX56
Piston and Piston Pin Clearance
(Piston pin clearance) = (Piston pin hole diameter) – (Piston pin
diameter)
If clearance exceeds specification, replace either or both of pis-
ton/piston pin assembly and connecting rod assembly with refer-
ence to specification of each part.
Refer to piston selection table to replace piston/piston pin
assembly. Refer to EM-83, "
HOW TO SELECT PISTON" .
Refer to connecting rod bearing selection table to replace con-
necting rod. Refer to EM-84, "
HOW TO SELECT CONNECTING
ROD BEARING" .
NOTE:
The connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant.
For service parts, no grades can be selected. (Only 0 grade is
available.)
Refer to EM-92, "Connecting Rod Bushing Oil Clearance (Small
End)" for the values for each grade at the plant.
PISTON RING SIDE CLEARANCE
Measure side clearance of piston ring and piston ring groove
using suitable tool.
If out of specification, replace piston and/or piston ring assembly.
PISTON RING END GAP
Check if diameter of cylinder bore is within specification.
Refer to EM-94, "
Piston to Cylinder Bore Clearance" .
Insert piston ring until middle of cylinder with piston, and mea-
sure gap.Standard : 0.002 - 0.006 mm (0.0001 - 0.0002 in)
KBIA2496E
KBIA2536E
Standard:
Top ring : 0.035 - 0.085 mm (0.0014 - 0.0033 in)
2nd ring : 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Oil ring : 0.015 - 0.050 mm (0.0006 - 0.0020 in)
Limit:
Top ring : 0.11 mm (0.0043 in)
2nd ring : 0.10 mm (0.0039 in)
SEM 02 4AA
Standard:
Top ring : 0.23 - 0.33 mm (0.0091 - 0.0130 in)
2nd ring : 0.25 - 0.40 mm (0.0098 - 0.0157 in)
Oil ring : 0.20 - 0.60 mm (0.0079 - 0.0236 in)
Limit:
Top ring : 0.56 mm (0.0220 in)
2nd ring : 0.52 mm (0.0205 in)
Oil ring : 0.96 mm (0.0378 in)
PBIC0 118 E
Page 1974 of 3371

CYLINDER BLOCK
EM-91
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
If out of specification, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylin-
der and use oversized piston and piston ring.
CONNECTING ROD BEND AND TORSION
Check the connecting rod alignment using suitable tool.
If measurement exceeds the limit, replace connecting rod
assembly.
CONNECTING ROD BEARING (BIG END)
Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod large end inside diameter.
Refer to EM-77, "
ASSEMBLY" .
If measurement exceeds the standard, replace the connecting
rod.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Connecting Rod Inside Diameter (Small End)
Measure inside diameter of bushing using suitable tool.Limit:
Bend
: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
To r s i o n
: 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
SEM 00 3F
SEM 03 8F
Standard : 57.000 - 57.013 mm (2.2441 - 2.2446 in)
PBIC1641E
Standard : 22.000 - 22.006 mm (0.8661 - 0.8664 in)
PBIC0120E
Page 1975 of 3371

EM-92Revision: August 2007
CYLINDER BLOCK
2004 QX56
Piston Pin Diameter
Measure diameter of piston pin using suitable tool.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inside diameter of con-
necting rod small end) – (Piston pin diameter)
If the measured value exceeds the standard, replace the con-
necting rod assembly and/or piston and piston pin assembly.
If replacing the piston and piston pin assembly, refer to the Table
for Selective Fitting for Piston to select the piston corresponding
to the applicable bore grade of the cylinder block to be used.
Refer to EM-83, "
HOW TO SELECT PISTON" .
Factory installed parts grading:
Only grade 0 is available.
Unit: mm (in)
CYLINDER BLOCK DISTORTION
Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.
CAUTION:
Do not allow any debris to enter the oil or coolant passages.
Measure the block upper face for distortion in six directions as
shown.
If measurement exceeds the limit, replace the cylinder block.Standard : 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0 117 E
Standard : 0.005 - 0.017 mm (0.0002 - 0.0007 in)
KBIA2536E
Grade 0
Connecting rod bushing inside diameter22.000 - 22.006
(0.8661 - 0.8664)
Piston pin diameter21.989 - 21.995
(0.8657 - 0.8659)
Piston pin hole diameter21.993 - 21.999
(0.8659 - 0.8661)
KBIA2496E
Standard : 0.03 mm (0.0012 in)
Limit : 0.1 mm (0.004 in)
SEM 12 3C
Page 1976 of 3371

CYLINDER BLOCK
EM-93
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
MAIN BEARING HOUSING INSIDE DIAMETER
Install the main bearing caps with the main bearings removed,
and tighten the bolts to the specified torque. Refer to EM-77,
"ASSEMBLY" .
Measure the inside diameter of the main bearing housing.
If out of the standard, replace the cylinder block and main bear-
ing caps as an assembly.
NOTE:
These components must be replaced as a single unit, because
they were processed together.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Diameter
Measure cylinder bore for wear, out-of-round and taper at six dif-
ferent points on each cylinder ("X" and "Y" directions at "A", "B"
and "C").
NOTE:
When determining cylinder bore grade, measure cylinder bore at
B position.
If the measured value exceeds the repair limit, or if there are
scratches and/or seizure on the cylinder inner wall, hone or bore the inner wall.
An oversize piston is provided. When using an oversize piston, hone the cylinder so that the clearance
between the piston and cylinder satisfies the standard.
If oversize piston is used, use it for all cylinders with oversize piston rings.
Piston Skirt Diameter
Measure piston skirt diameter using suitable tool.Standard : 68.944 - 68.968 mm (2.7143 - 2.7153 in)
PBIC1643E
PBIC0123E
Standard diameter:
98.000 - 98.030 mm (3.8583 - 3.8594 in)
Wear limit:
0.20 mm (0.0079 in)
Out-of-round (Difference between X and Y):
Limit: 0.015 mm (0.0006 in)
Taper limit (Difference between A and C):
Limit: 0.010 mm (0.0004 in)
Piston oversize Grade No. 0 (Service) : 0.20 mm (0.0079 in)
PBIC0124E
Standard : 97. 980 - 98. 010 mm (3.8575 - 3.8587 in)
PBIC0125E