Main Bearings, Crankshaft and Cylinder Block Inspection - Suzuki Jimny Workshop Manual
1D
Main Bearings, Crankshaft and Cylinder Block Inspection
Crankshaft Thrust Play
1)
Install main bearing, thrust bearing, crankshaft and main bearing cap referring to
Main Bearings, Crankshaft and Cylinder Block Removal and Installation:K9K
.
2)
Using a dial gauge to read displacement in axial (thrust) direction of crankshaft.
If measured value is out of specification, replace thrust bearing.
If measured value is out of specification, replace thrust bearing.
Crankshaft thrust play
New thrust bearing:
0.045 – 0.252 mm (0.00178 – 0.00992 in.)
Reused thrust bearing:
0.045 – 0.852 mm (0.00178 – 0.03354 in.)
Crankshaft
Crankshaft journal
•
Inspect crankshaft journal for uneven wear or damage. Measure crankshaft journal diameter using a micrometer. If crankshaft journal is damaged or diameter is out of specification, replace crankshaft.
Crankshaft journal diameter:
47.990 – 48.010 (1.88937 – 1.89015 in.)
Crankshaft journal bore
•
Inspect crankshaft journal bore for uneven wear or damage. Measure crankshaft journal bore. If crankshaft journal bore is damaged or diameter is out of specification, replace cylinder block.
Crankshaft journal bore diameter “a”:
51.936 – 51.949 mm (2.04473 – 2.04523 in.)
Main Bearing
•
Inspect bearing shells for signs of fusion, pitting, burn or flaking and observe contact pattern. Bearing shells found in defective condition must be replaced.
Main bearing thickness “a”:
1.943 – 1.959 mm (0.07650 – 0.07712 in.)
Main bearing clearance
NOTE:
Do not rotate crankshaft while gauging plastic is installed.
1)
Before checking bearing clearance, clean bearing and crankshaft journal.
2)
Install bearing to cylinder block and main bearing cap referring to
Main Bearings, Crankshaft and Cylinder Block Removal and Installation:K9K
3)
Place a piece of gauging plastic (1) to full width of crankshaft journal as contacted by bearing (parallel to crankshaft), avoiding oil hole.
4)
Install main bearing cap referring to
Main Bearings, Crankshaft and Cylinder Block Removal and Installation:K9K
.
5)
Remove cap and using a scale (1) on gauging plastic (2) envelope, measure gauging plastic width at the widest point (clearance).
If clearance is out of specification, use a new bearing and remeasure clearance.
If clearance is out of specification, use a new bearing and remeasure clearance.
Crankshaft journal clearance:
0.027 – 0.054 mm (0.00107 – 0.00213 in.)
Selection of main bearings
If engine is under the following condition, select new bearing as follows, and install it.
•
Bearing is in malcondition.
• Bearing clearance is out of specification.
• Crankshaft or cylinder block is replaced.
• Bearing clearance is out of specification.
• Crankshaft or cylinder block is replaced.
1)
First, check journal diameter. As shown in the figure, crank web No.8 (1) or flywheel mating surface (2) has stamped journal diameter categories. Twelve kinds of alphabets (“A”, “B”, “C”, “G”, “H”, “J”, “K”, “L”, “O”, “R”, “S” and “T”) represent the following journal diameters.
Journal bore diameter categories represent journal diameters marked with an arrow in figure respectively. For example, stamped alphabet “A” indicates that corresponding journal diameter is 47.990 – 47.997 mm (1.88937 – 1.88964 in.).
Journal diameter
| Journal diameter category | Journal diameter |
|---|---|
| “A”, “G”, “K”, “R” | 47.990 – 47.997 mm (1.88937 – 1.88964 in.) |
| “B”, “H”, “L”, “S” | 47.997 – 48.003 mm (1.88965 – 1.88988 in.) |
| “C”, “J”, “O”, “T” | 48.003 – 48.010 mm (1.88989 – 1.89015 in.) |
| 3. | Crankshaft pulley side |
| 4. | Flywheel side |
2)
Next, check journal bore diameter. Distance “a” between cylinder head mating surface and drill hole (1) represents the following journal bore diameters.
For example, if distance “a” is 33 mm (1.30 in.), it means all journals bore diameter are 51.936 – 51.942 mm (2.04473 – 2.04496 in.).
Journal bore diameter
| Distance “a” between cylinder head mating surface to drill hole | Journal bore diameter |
|---|---|
| 33 mm (1.30 in.) |
51.936 – 51.942 mm
(2.04473 – 2.04496 in.) |
| 43 mm (1.69 in.) |
51.942 – 51.949 mm
(2.0943 – 2.04523 in.) |
3)
There are 4 kinds of bearings differing in thickness. To distinguish them, they are painted (1) in the following colors at the position as indicated in figure. Each color indicates the following thickness at the center of bearing.
Main bearing thickness
| Color painted (1) | Bearing thickness |
|---|---|
| Black |
1.943 – 1.949 mm
(0.07650 – 0.07673 in.) |
| Blue |
1.946 – 1.952 mm
(0.07662 – 0.07685 in.) |
| Yellow |
1.949 – 1.955 mm
(0.07674 – 0.07696 in.) |
| Red |
1.953 – 1.959 mm
(0.07689 – 0.07712 in.) |
4)
From alphabets stamped on crank web No.8 or flywheel mating surface and cylinder head mating surface to drill hole distance, determine new bearing to be installed to journal by referring to table shown.
For example, if alphabet stamped on crank web No.8 or flywheel mating surface is “A” and cylinder head mating surface to drill hole distance is 33 mm (1.30 in.) on cylinder block, install new bearings painted in “Yellow”.
For example, if alphabet stamped on crank web No.8 or flywheel mating surface is “A” and cylinder head mating surface to drill hole distance is 33 mm (1.30 in.) on cylinder block, install new bearings painted in “Yellow”.
Main bearing cross-reference table (new standard bearing)
| Journal diameter category | ||||
|---|---|---|---|---|
| “A”, “G”, “K”, “R” | “B”, “H”, “L”, “S” | “C”, “J”, “O”, “T” | ||
| Distance “a” between cylinder head mating surface and drill hole |
33 mm
(1.30 in.) |
Yellow | Blue | Black |
|
43 mm
(1.69 in.) |
Red | Yellow | Blue | |
Visual inspection
Check bearings for pitting, scratches, wear or damage.
If any malcondition is found, replace both upper and lower halves.
Never replace one half without replacing the other half.
Cylinder Block
Distortion of gasketed surface
•
Using straightedge and thickness gauge, check gasketed surface for distortion.
If flatness exceeds its limit, replace cylinder block.
If flatness exceeds its limit, replace cylinder block.
Cylinder block flatness
Limit: 0.03 mm (0.0012 in.)