Removing the crankshaft
This operation is possible only after removing the engine from the vehicle.
1. Disconnect the connecting rods from the crankshaft. If you only need to remove the shaft, you do not need to remove the head and remove the pistons with connecting rods.
2. Remove the oil pump and rear crankshaft seal cover.
3. Using a feeler gauge, check if the longitudinal clearance of the crankshaft is within the range of 0.07 to 0.17 mm. This can be done by inserting a feeler gauge between the central arm of the track-shaft and the support rings. Find out if the support rings need to be replaced.
4. Check to see if the symbols indicating the position of the main bearing covers are visible. It is important to install them in relation to the housing in the correct order. The cover number must be visible.
The numbering must start from the first cylinder or from the side of the timing belt. All numbers must be on the same side of the crankshaft, such as the air separator side of the main crankcase.
5. Unscrew the bolts and, lightly hitting with a hammer, slide the liner cover, and then remove it. Save the liners and support half rings by indicating their position relative to the cover
6. Remove the crankshaft from the main capter, and then the remaining liners and support rings, save according to the designation of their position relative to the casing (corps).
Control and repair of the crankshaft
7. It is necessary to check for scratches and abrasions on the surface of the pins and crankshaft liners.
Using a micrometer, check the oval of all connecting rod pins. If it exceeds 0.017 mm, the crankshaft must be ground and the liners replaced with larger liners. Place the shaft on prisms and check the runout of the crankshaft center trunnion. Allowable runout may be 0.03 mm Check the diameters of the main and crank pins. If they do not correspond to the allowable dimensions, it is necessary to give the shaft for regrinding.
8. Grinding of the crankshaft must be entrusted to a specialized workshop.
9. If the longitudinal clearance of the crankshaft exceeds the maximum value of 0.37 mm, it is necessary to replace the supporting half rings with larger half rings so that the clearance is reduced to an acceptable value.
Crankshaft installation
10. We wipe the back of the main liners, as well as the nests of the liners in the block and in the covers.
11. We insert the main liners into the body of the block, as well as into the nests of the covers and lubricate them with plenty of oil.
12. Lubricate the back of the support half rings with grease and glue them to the side of the central body of the main liner and its cover. The half rings must be clamped with their oil passages facing out.
13. We put the crankshaft on the liners, and then install the covers of the main liners according to the numbers. All numbers on the caps must be on the same side of the crankshaft. Note that with the correct installation of the cover with the half-liner, the tongues of the half-liners will be on one side of the crankshaft. Before installation, the crankshaft must be washed, the oil channels rinsed and blown, and the shaft trunnions rubbed and covered with oil.
14. We insert the bolts and tighten them gradually until the specified moment. Check if the crankshaft rotates freely. If the shaft rotates heavily, unscrew one cover at a time to determine the location of the desired pin. It usually turns out that one of the trunnions is poorly ground. To verify this, it is necessary to remove the shaft again and measure both the shaft journal and the hole in the housing along with the liners. The mounting clearance must be at least 0.005 mm. Check the runout of the middle trunnion of the shaft and the taper of all the trunnions.
Caution: The bushings must not be scraped off Install the rear seal cover (point 6) and oil pump, then put the connecting rods.
Visitor comments