Technical Data
Technical Data MD6A
General
Type designation
Output (DIN) at 40 rev/sec (2400 rev/mm)
Number of cylinders
Bore
Stroke
Capacity
MD6A
7.4 kW (10 h.p.)
2
70 mm (2.7560”)
82 mm (3.2283”)
0.63 dm
3
Compression ratio
Compression pressure at starter motor speed
Direction of rotation, viewed towards flywheel
Idling speed
Oil pressure, hot engine
Oil pressure, idling, hot engine
18.7:1
23—25 kp/cm2 (327—355 lbf/in2)1)
Clockwise
12 rev/sec (700 rev/min)
4 kp/cm (57 lbf/in )
0,8 kp/cm (11 lbf/in2)
2
2
2
Cylinders
Material
Bore, standard
0.500 mm (0.020”) oversize
Cast iron
70.000—70.019 mm (2.7560—2.7566”)
70.500—70.519 mm (2.7755—2.7763”)
Pistons
Material
Height, total
Height from gudgeon pin centre to piston crown
Piston clearance in cylinder
Pistons, standard
0.500 mm (0.020”) oversize
Light-metal
81 mm (3.19”)
51 mm (2.00”)
0.086—0.130 mm (0.0034—0.0051”)
69.889—69.914 mm (2.7515—2.7525”)
70.389—70.414 mm (2.7712—2.7722)
Gudgeon pins
Diameter
Gudgeon pin bushing, diameter
Clearance, gudgeon pin — bushing
27.9975—28.0025 mm (1.1023—1.1025”)
28.0125—28.0225 mm (1.1029—1.1032”)
0.010—0.025 mm (0.0004—0.0010”)
Piston rings
Compression rings, number
Oil scraper ring, number
2
1
Upper compression ring has chromium lining
Piston rings are available for standard size and 0.500 mm
(0.020”) oversize
Piston ring clearance in groove, axially:
Upper compression ring
Lower compression ring
0.062—0.113 mm (0.0024—0.0044”)
0.037—0.087 mm (0.0015—0.0034”)
0.037—0.089 mm (0.0015—0.0035”)
Oil scraper ring
Piston ring gap in cylinder:
Upper compression ring
Lower compression ring
0.279—0.406 mm (0.0110—0.0160”)
0.203—0.330 mm (0.0080—0.0130”)
0.350—0.480 mm (0.0140—0.0189”)
Oil scraper ring
Crankshaft
Material
Crankshaft axial clearance
Main bearing radial clearance
Connecting rod radial clearance
Nodular iron
0.08—0.31 mm (0.0031—0.0122”)
0.026—0.075 mm (0.0010—0.0030”)
0.026—0.075 mm (0.0010—0.0030”)
1)Measured with Moto Meter nipple 884535 and yoke 884543.
35
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD6A, Volvo Penta MD7A |
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(2 votes, average: 3.5 out of 4)
Marine readers have rated Volvo Penta MD6A MD7A Workshop Manual 3.5 out of 4.0 based on 2 product reviews. good manual just what I needed
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