Contents: General characteristics 🠛 Precautions when washing the engine 🠛 Repair of threaded holes 🠛 Tightening torques 🠛 Parts that are not allowed to be…🠛
Engine K7J (longitudinal section): 1 - crankshaft; 2 - crankshaft main bearing cap; 3 - oil pump drive chain sprocket; 4 - auxiliary drive belt pulley; 5 - toothed pulley of the crankshaft; b - front crankshaft oil seal; 7 - water pump; 8 - toothed pulley of water pump; 9 - valve timing belt cover; 10 - camshaft toothed pulley; I - camshaft oil seal; 12 - cylinder head cover; 13 - valve drive rocker arm axis; 14 - camshaft; 15 - cylinder head; 16 - cylinder block; 17 - flywheel; 18 - rear crankshaft oil seal; 19 - oil pan; 20 - connecting rod bearing shell; 21 - main bearing shell; 22 - oil pump inlet pipe
Engine K7J (cross section): 1 - connecting rod cover; 2 - connecting rod; 3 - piston pin; 4 - piston; 5 - inlet pipe; b - camshaft; 7 - inlet valve; 8 - intake valve rocker; 9 - adjusting bolt; 10 - adjusting bolt lock nut; 11 - valve drive rocker arm axis; 12 - exhaust valve rocker; 13 - valve spring plate; 14 - valve spring; 15 - valve guide bushing; 16 - exhaust valve; 17 - crankshaft; 18 - flywheel; 19 - oil pan
General characteristics
- Engine - K7J 700
- Engine displacement: 1390 cm³
- Cylinder diameter - 79.5 mm
- Piston stroke - 70 mm
- Compression ratio - 9.5/1
- The firing order of the cylinders is 1-3-4-2
Precautions when washing the engine
Protect the camshaft and alternator drive belts from water and detergents. Do not allow water to enter the air intake ducts.
Repair of threaded holes
Threaded holes in all parts of the engine can be repaired by using spiral inserts with the appropriate thread.
Tightening torques
Sectional view and tightening torques of threaded connections. (1) - Threads and contact surfaces under the bolt heads lubricated with engine oil, (2) - Pre-tightening to 20 Nm followed by an additional turn at an angle of 68±6°, (3) - Bolt and nut M6, (tightening torque 10 Nm), bolt M8 (tightening torque 22 Nm), (4) - Tightening torque of the camshaft belt tensioner nut 50 Nm, (5) - Before tightening, lubricate the bolt thread and the surface under its head with engine oil.
Sectional view and tightening torques of threaded connections. (1) - Pre-tighten to 10 Nm, then tighten to 43 Nm.
Sectional view and tightening torques of threaded connections. (1) - See tightening of cylinder head mounting bolts in subsection "Installing the cylinder head", (2) - Pre-tighten the bolts to a torque of 25 Nm, then tighten further to an angle of 47±5°.
Parts that are not allowed to be reused
1. All seals and gaskets.
2. Flywheel mounting bolts.
3. Valve guide bushings.
4. Cylinder head mounting bolts.
5. Crankshaft main bearing cap bolts.
The main difference between the K4J engine and the K7J engine - the presence of two camshafts (separate intake and exhaust valves) in the cylinder head. The camshafts are driven by a reinforced toothed belt. Sixteen engine valves are driven by the camshafts using roller rocker arms (rockers). Hydraulic compensators automatically ensure gap-free contact of the camshaft cam with the valve. The cylinder block, crankshaft, flywheel, pistons, piston pins, and connecting rods of both engines are identical. The lubrication, cooling, and power supply systems are also identical in design.