Technical Data MD7A
General
Type designation
Output at flywheel (DIN) at 43 rev/sec. (2600 rev/mm.)
Number of cylinders
Bore
Stroke
Capacity
MD7A
10 kW (13.4 h.p.)
2
76 mm (2.9921”)
82 mm (3.2283”)
0.744 dm
3
Compression ratio
Compression pressure at starter motor speed
Direction of rotation, viewed towards flywheel
Idling speed
Oil pressure, full speed, hot engine
Oil pressure, idling, hot engine
17:1
2-2.5 MPa (20—25 kp/cm2) (284—355 lbf/in2)
Clockwise
11—13 rev/sec (650—780 rev/min)
2 2
0.35-0.40 MPa (3.5-4.0 kp/cm ) (50-57 lbf/in )
2 2
0.08-0.15 MPa (0.8-1.5 kp/cm ) (11-21 lbf/in )
Cylinders
Material
Bore, standard
Cast iron
76.00—76.03 mm (2.9921—2.9933”)
76.25—76.28 mm (3.0020—3.0032”)
76.50—76.53 mm (3.0118—3.0130”)
0.25
0.50
mm (0.010”) oversize
mm (0.020”) oversize
Pistons
Material
Light-alloy
Height, total
Height from gudgeon pin centre to piston crown
Piston clearance in cylinder
Pistons, standard diameter
0.25 mm (0.010”) oversize
0.50 mm (0.020”) oversize
76.4 mm (3.0079”)
51.4 mm (2.0236”)
0.073—0.118 mm (0.0029—0.0046”)
75.912—75.927 mm (2.9883—2.9893”)
76.162—76.177 mm (2.9985—2.9991”)
76.412—76.427 mm (3.0084—3.0090”)
Gudgeon pins
Diameter
Gudgeon pin bushing, diameter
Clearance, gudgeon pin - bushing
28.000—28.004 mm (1.1024—1.1025”)
28.0125—28.0225 mm (1.1029—1.1032”)
0.0085—0.0230 mm (0.0003—0.0009”)
Piston rings
Compression rings, number
Oil scraper ring, number
The upper compression ring is chromium lined
Piston rings are available for standard size, 0.250 mm
(0.010’) and 0.500 mm (0.020”) oversize
2
1
Piston ring clearance in groove, axially:
Upper compression ring
Lower compression ring
Oil scraper ring
0.070—0.102 mm (0.0028—0.0040”)
0.050—0.082 mm (0.0020—0.0030”)
0.030—0.062 mm (0.0012—0.0024”)
Piston ring gap in cylinder
Upper compression ring
Lower compression ring
Oil scraper ring
0.30—0.50 mm (0.0120-0.020”)
0.30—0.50 mm (0.0120-0.020”)
0.25—0.50 mm (0.010-0.020”)
Crankshaft
Material
Crankshaft axial clearance
Main bearing radial clearance
Big-end bearings, radial clearance
Nodular iron
0.080—0.313 mm (0.0032—0.0123”)
0.026—0.075 mm (0.0010—0.0030”)
0.026—0.075 mm (0.0010—0.0030”)
39
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD6A, Volvo Penta MD7A |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
(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
Well i haven't read it yet but it's gonna help me out when I do.