Piston with connecting rod, removing and fitting
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Piston with connecting rod, removing and fitting
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2.
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Remove the oil intake pipe (1) from the oil pump and the engine block.
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4.
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Remove the big-end bearing cap from the connecting rod.
The fracture surfaces of the connecting rods and the big-end bearing caps form an individual fit and must not be interchanged or damaged. Do not rest the connecting rods or big-end bearing caps on their fracture surfaces to avoid damage.
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5.
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Remove combustion residue from the top part of the cylinder bore.
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1.
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Press out the piston together with the connecting rod upward from the cylinder bore.
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2.
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Check and clean all parts, change them if necessary. Change the piston - see
Piston, change
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3.
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Put the crankshaft big-end journal in "ND position" and moisten it with engine oil.
Adjust the piston ring positions:
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4.
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Oil scraper ring II: offset the steel ring gaps 25 to 50 mm to the left and right of the middle ring gap respectively. Piston ring I: offset the ring gap about 180°. Second piston ring with "TOP" face up.
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5.
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Moisten the piston rings with engine oil and compress them with a normal piston ring compressor.
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6.
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Push the piston into the cylinder bore with the handle of a hammer.
Caution
Note the fitting position of the piston and connecting rod.
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7.
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The arrow (1) on the bottom of the piston pointing towards the timing end of the engine, the boss (2) on the connecting rod towards the gearbox end.
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1.
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Note the order of the big-end bearing caps.
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2.
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Fit the big-end bearing caps - boss (1) on the big-end bearing cap pointing towards the gearbox end.
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3.
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Big-end bearing cap with new bolts on connecting rod - tightening torque 25 Nm + 30°.
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4.
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Fit the oil intake pipe (2) together with a new sealing ring on the oil pump - tightening torque 8 Nm
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Note
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Recut the threads before reuse and apply locking compound (red) when fitting the bolts. Mounting time including checking torque must not exceed 10 min.
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5.
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Fit the oil intake pipe onto the engine block - tightening torque 8 Nm.
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