Checking the technical condition
Installation clearances, wear limits and repair dimensions of parts are given in subsection «Detailed Specifications».
Never clean the mating surfaces of cast parts. Use solvents to clean parts.
Disassembly and assembly of the connecting rod and piston group
Remove piston rings.
Lay the piston in a support with a cylindrical recess and use a mandrel to press out the pin.
Assemble pistons with connecting rods using tool 49 8134 040, including tool 48 8134 042.
Connect the piston to the connecting rod so that the mark or arrow on the inner surface of the piston pin is directed away from the oil hole on the rod of the connecting rod.
To connect the piston to the connecting rod, perform the following operations:
- lubricate the piston pin with engine oil;
- put your finger on the mandrel 49 8134 042;
- Using a press, push the piston pin into the piston bore and into the top end of the connecting rod until the guide 49 8134 044 rests against the support 49 8134 041 of the tool.
Lubricate the grooves on the piston and piston rings with engine oil and install the rings on the piston. Arrange the joints of the rings, as shown in the figure. Install compression rings with marks up.
Using a piston ring compressor, insert the pistons with connecting rods into the cylinders, making sure that the marks «F» on the pistons were directed towards the camshaft drive. Install the bearings in the connecting rods and connecting rod caps. Install the connecting rods and connecting rod caps on the crankshaft journals, tighten the connecting rod bolts. Connecting rod caps must be installed so that the mark on the cap is against the mark on the bottom head of the connecting rod.
In the future, assemble the engine by performing the disassembly operations in the reverse order of disassembly, taking into account the following:
- lubricate the main bearing shells and thrust half rings with engine oil;
- thrust half rings must face the grooves towards the thrust surfaces of the crankshaft;
- check and, if necessary, adjust the axial free play of the crankshaft;
- make sure the crankshaft rotates freely;
- install a new oil filter.