4. DISASSEMBLY, INSPECTION AND REASSEMBLY OF ENGINES [NOTICE] 1) When a diaphragm is damaged, pressure control inside the crankcase becomes insufficient, and troubles occur. When the internal pressure of the crankcase decreases too much due to the damage of a spring, much blowby gas containing oil is reduced in intake air system, and it may cause the combustion defect by the early dirt of the intake valve or the urgent rotation of the engine by the oil burning. When pressure progresses in the crank case too much due to the wrong operation of the diaphragm and so on, it is considered that oil leakage from the joint of an oil pan, an oil seal and so on will occur.
When a diaphragm is damaged, blowby is discharged from the breathing hole on the side of diaphragm cover, and not reduced in the intake manifold. Therefore, be careful of the diaphragm trouble. 2) At lubricating oil replacement or lube oil supply The amount of lubricating oil isn't to be beyond the standard upper limit (in the engine horizontality, the upper limit mark of the dip stick). Since the blowby gas reductor is adopted, be careful that the amount of oil mist may be inducted in the combustion chamber and the oil hammer sometimes may occur, when the lubricating oil quantity is beyond the upper limit or an engine is operated beyond the allowable max- imum angle of an engine.
[Reassembly] Replace the diaphragm with new one, when it is damaged. Point 7 [Disassemble] Keep the removed push rods by attaching tags showing corresponding cylinder Nos. [Reassemble] Always apply oil to the contact portions of the push rods and clearance adjusting screws. Point 8 [Disassemble] Loosen the cylinder head bolts in two steps in the illustrated order. Place the cylinder head ass’y on a paper board to prevent the combustion face from any dam- age. [Reassemble] Remove the head gasket with a new one. Uniformly install the head bolts manually after applying oil on the threaded and seat portions. They shall be tightened in two steps in the reverse of the order for disassembly.
Tightening torque Nm {kgm} 82E-5 – 98E-5 SERIES 4-17 3D82AE (S)3D84E (S)4D84E 3D88E 4D88E 4D94LE (S)4D98E First step 30.0 – 34.0 {3.1 – 3.5} 41.1 – 46.9 {4.2 – 4.8} 49.0 – 58.8 {5.0 – 6.0} Second step 61.7 – 65.7 {6.3 – 6.7} 85.3 – 91.1 {8.7 – 9.3} 103.1 – 112.9 {10.5 – 11.5}