Takeuchi TB 175 Handbuch Seite 788

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 a oil pan, a 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 horizontally, the
upper limit mark of the dip stick). Since the blowby gas redactor 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 maximum
angle of an engine.
[Reassembly]
Replace the diaphragm with new one, when it is damaged.
Point7
[Disassemble]
• Keep the removed push rods by attaching tags show-
ing corresponding cylinder Nos.
[Reassemble]
• Always apply oil to the contact portions of the push
rods and clearance adjusting screws.
Point8
[Disassemble]
• Loosen the cylinder head bolts in two steps in the
illustrated order.
• Place the cylinder head assy on a paper board to pre-
vent the combustion face from any damage.
[Reassemble]
• Remove the head gasket with a new one.
• Uniformly install the head bolts manually after apply-
ing oil on the threaded and seat portions.
• They shall be tightened in two steps in the reverse of
the order for disassembly.
• Tightening torque
TNV82A
30.0 to 34.0
First step
(3.1 to 3.5)
61.7 to 65.7
Second step
(6.3 to 6.7)
4TNV94L/98
49.0 to 58.8
First step
(5.0 to 6.0)
103.1 to 112.9
Second step
(10.5 to 11.5)
N•m (kgf•m)
TNV84-88
41.1 to 46.9
(4.2 to 4.8)
85.3 to 91.1
(8.7 to 9.3)
4TNV106 (T)
88.3 to 98.1
(9.0 to 10.0)
188.0 to 197.8
(19.0 to 20.0)
74
Disassembly
Camshaft side
8
14
2
12
10
4
6
13
Head bolt disassembly order
3 cylinder head
Assembly
Camshaft side
1
7
3
13
5
11
2
9
Head bolt tightning order
3 cylinder head
Disassembly
Camshaft side
7 16
1 18
9
3
11 17
5 13
Head bolt disassembly order
4 cylinder head
Assembly
Camshaft side
12 3
18
10 1
16 8 2
14 6
Head bolt tightning order
4 cylinder head
5
3
9
11 1
7
10
12
6
14
4
8
14 6
12 4
2
10
15 8
5 13
15
7
9 17
4 11