Pic. 2.280. Crankshaft and its components
Disassembly
Remove the timing belt, front cover, flywheel, cylinder head and oil pan. Parts removal procedures are given in the relevant sections.
Remove the cylinder block rear plate and crankshaft rear oil seal.
Remove the connecting rod caps and connecting rod bearing shells.
Note. For correct subsequent installation, position the removed parts (connecting rod caps, connecting rod and main bearing shells) in order of their respective cylinder numbers and installation orientation.
Remove the connecting bracket of the main bearing caps of the main bearing cap and the crankshaft. Position the main bearing shells in order of their respective cylinder numbers.
Checking the crankshaft
Check the crankshaft main and connecting rod journals for damage (snags and grips), excessive wear and cracks. Clean the shaft oil channels. Repair or replace crankshaft if necessary.
Pic. 2.281. Checking the taper and ovality of the main and connecting rod journals of the crankshaft
Check the taper and ovality of the main and connecting rod journals of the crankshaft (pic. 2.281).
Rated value:
- Main journal diameter: 61.982–62.000 mm.
- Crankpin diameter: 47.982–48.000 mm.
Inserts of main and connecting rod bearings
Visually inspect the surface condition of each liner (flaking of the friction layer, uneven contact, risks, scoring, etc.). Replace defective earbuds.
Bearing clearance measurement
Pic. 2.282. Measuring the inside diameters of the main bearing holes
Measure the diameter of the main and connecting rod journals of the crankshaft. Measure the inner diameters of the main bearing holes in the crankshaft bed (in the cylinder block and bearing cap) and holes for connecting rod bearings (in the lower head of the connecting rod and the connecting rod cap) (pic. 2.282).
Measure the thickness of the connecting rod and main bearing shells. Calculate the clearance in the bearings from the results of the measurements (subtract from the inner diameter of the bearing hole the diameter of the shaft journal and two thicknesses of the bearing shell).
Rated value:
- Main bearing clearance: 0.004–0.022 mm.
- Connecting rod bearing clearance: 0.018–0.036 mm.
Limit clearance: 0.1 mm.
Measuring bearing clearance with a plastic gauge
Pic. 2.283. Installing a plastic gauge
Determination of the clearance in the main bearings of the crankshaft using the plastic gauge method.
Remove oil, grease or other contaminants from the shaft journals. Wash and dry the bearing shells.
Cut the plastic gauge into pieces equal in width to the shaft journals. Lay the gauges on the necks along the axis of the shaft (do not put the gauge on the oil supply holes).
Install the bearing shells, crankshaft and main bearing cap connecting bracket. Tighten the main bearing cap connecting bracket bolts to the specified torque. Do not rotate the crankshaft! Remove the connecting bracket. Measure the maximum width of the crushed part of the gauge using the scale on the gauge envelope. Determine bearing clearance. Repair or replace crankshaft or bearing shells as needed. If the gap cannot be corrected by replacing the bearing, regrind the shaft journals to the repair size with the corresponding replacement of the bearings.
Checking the stuffing box
Check the front and rear crankshaft oil seals for damage or wear on the sealing lips. In the presence of defects replace an epiploon.
Automatic transmission drive plate
Replace warped or cracked plate.
Assembly
Pic. 2.284. Upper and lower main bearing shells
Install the upper main bearing shells into the crankshaft bed on the cylinder block (pic. 2.284). The top bearings have an oil distribution groove.
Install the bottom bushings (without grooves) in the bed of the connecting bracket of the main bearing caps.
Apply engine oil to the crankshaft journals. Install the crankshaft.
Install the lower shells and main bearing caps with the mark toward the front of the engine.
Pic. 2.285. The order of tightening the bolts of the main bearing caps
Tighten the cover bolts to the nominal tightening torque (pic. 2.285).
The moment of an inhaling of bolts of fastening of a cover of the radical bearing: М7 (9–16) - 10–12 Nm, M10 (1–8) - 14–16 Nm.
Tighten the bolts gradually in four or five steps, then tighten to the specified torque.
Pic. 2.286. Measurement of crankshaft end play
Check the freedom of rotation of the crankshaft and measure the axial clearance (pic. 2.286).
Axial clearance:
- Nominal value: 0.07 - 0.25 mm.
- Limit value: 0.4 mm.
Pic. 2.287. Mandrel for oil seal installation
With mandrel (09231–33000) install the seal in its housing (pic. 2.287).
Pic. 2.288. Sealing locations
Apply sealant to the areas of the stuffing box shown in the illustration (pic. 2.288). Install the housing and seal.
The moment of an inhaling of bolts of fastening of the case of a back epiploon: 10–12 Н·м.
Establish a back plate of the block of cylinders and tighten bolts of its fastening.
The moment of an inhaling of bolts of fastening of a back plate: 10–12 Н·м.
Pic. 2.289. Torque converter plate installation diagram
Models with automatic transmission: Install the automatic transmission drive plate and adapter plate (pic. 2.289).
The moment of an inhaling of bolts of fastening of a plate: 73–77 Н·м.
Pic. 2.290. Flywheel Installation Diagram
Manual transmission models: install the flywheel. Tighten the fastening bolts to the nominal torque (pic. 2.290).
The moment of an inhaling of bolts of fastening of a plate: 73–77 Н·м.