AR01.40-B-9271A | Widen cylinder bore in crankcase | 12.02.16 |
Cumbustion engine 372, 374, 376, 377, 386 with Vehicle 382.### #B, 382.### #D, 384.### #B, 384.### #D, 386.### #B, 386.### #D, 682.### #B, 682.### #D, 684.### #B, 684.### #D, 688.### #B, 688.### #D, 693.### #B, 693.### #D, 694.### #B, 694.### #D, 695.### #B, 695.### #D
B01.40-0015-06
1 Engine block
A Height of engine block
B Cylinder liner housing diameter, in basic bore
c Cylinder liner collar housing diameter, in basic bore
d Depth of seat for cylinder liner collar housing
e/e1 Chamfer on seat surface for the cylinder liner collar
E Minimum permissible wall thickness between the cylinder liner basic bore and the coolant gallery
F Max. radius in cylinder liner collar housing
g Bore widening diameter in cylinder liner basic bore at first pass
h Maximum depth of the first widening pass of cylinder liner basic bore
| Check: | ||
1 | Check height (A) of engine block (1). | Replace the engine block, in case the height (A) is smaller than the lowest tolerance limit prescribed for repair stage III (-0.9). | |
Machining | |||
2 | Secure the engine block (1) in the broaching machine. | ||
3 | Center the cylinder to be machined, in relation to the broaching machine. | As centering reference, adopt the diameter of the cylinder, in the area above the reversing point of the 1st piston ring. | |
4 | Adjust the tool and carry out the machining, in several steps, until attaining a diameter 0.05 mm smaller than the final diameter (B). | Diameter (B) of the housing for the cylinder liner (final finish). In those cases when machining more than one cylinder, observe the working sequence, to prevent damage due to excessive heating: 4-cylinder engines; 2-4-1-3 and 6-cylinder engines; 1-3-5-2-4-6. Broaching machine setting values: Speed; 250 - 280/min (rpm). Tool feeding; 0.04 - 0.06 mm/turn. | |
5 | Hone the cylinder liner housing until obtaining the diameter (B), final finish. | Diameter (B) of cylinder liner housing. | |
Surface finish (roughness) of housing surface (B). | |||
Honing machine setting values: Working pressure; 2.5 - 3.0 bar. Speed; 60 - 100/min. (rpm). Honing angle; 40o- 60o. Double stroke; 30 - 40/min. | |||
6 | With a tool, having a cutting angle of 90o, machine the housing for the cylinder liner collar. | Ensure the data listed next are obtained: | |
Housing diameter (C). | |||
Depth (D) of the collar housing. | |||
Max. radius (E) in the housing for the collar. | |||
7 | Machine the chamfer (e/e1) on the seating surface for cylinder liner collar. | Remove eventual burr at corners of the chamfer (e/e1). | |
Chamfer (e) on basic bore for cylinder liner. |
Inspection data of crankcase
Número | Denominação | Engine 374.9 | Engine 372.9, 376.9, 377.9, 386.9 | |||
BE01.40-B-1001-02A | Block height (A) | Standard | mm | 358,82...359,07 | 358,82...359,07 | |
Repair I (- 0.3) | mm | 358,52...358,77 | 358,52...358,77 | |||
Repair III (- 0.9) | mm | 357,92...358,17 | 357,92...358,17 | |||
BE01.40-B-1002-02A | Liner lodging diameter (B) | mm | 100,400...100,435 | 100,400...100,435 | ||
BE01.40-B-1003-02A | Liner collar lodging diameter (C) | mm | 103,572...103,626 | 103,572...103,626 | ||
BE01.40-B-1004-02A | Liner collar lodging depth (D) | mm | 4,6...4,8 | 4,6 ... 4,8 | ||
BE01.40-B-1005-02A | Cylinders finishing roughness, for the liners installation (Maximum Rz) | mm | 0,016...0,022 | 0,016...0,022 | ||
BE01.40-B-1011-02A | Chamfer for the liner lodging orifice | and | degrees | 45 | 45 | |
e1 | mm | 0,3...0,4 | 0,3...0,4 | |||
BE01.40-B-1012-02A | Diameter of the liner lodging widening | First pitch | mm | 99,2 | 99,2 | |
Second pitch | mm | 100,2 | 100,2 | |||
BE01.40-B-1019-02A | Radius (F) in the liner collar lodging (maximum) | mm | 0,2 | 0,2 | ||