
Workshop Manual, TPD 1350, issue 3
77
13
New 1000 Series
Data and dimensions
Note: This information is given as a guide for personnel engaged on engine overhauls. The dimensions which
are shown are those which are mainly used in the factory. The information applies to all engines, unless an
engine type code is shown.
Pistons
Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ."Fastram" combustion bowl
inserted top ring groove, graphite skirt
Diameter of bore for gudgeon pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39,703/39,709 mm (1.5631/1.5633 in)
Height of piston above top face of cylinder block . . . . . . . . . . . . . . . . . . . . . . . 0,38/0,50 mm (0.015/0.020 in)
Width of groove for top ring:
- Engine types AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Tapered
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,60/2,62 mm (0.1023/0.1031
Width of groove for second ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,56/2,58 mm (0.1008/0.1016 in)
Width of groove for third ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . 3,54/3,56 mm (0.1393/0.1401 in)
- Engine types, AR and AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,53/3,55 mm (0.1389/0.1397 in)
Piston cooling jets
Valve open pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178/250 kPa (26/36 lbf/in
2
) 1,8/2,6 kgf/cm
2
Piston rings
Top compression ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . Barrel face, molybdenum insert, wedge
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barrel face, molybdenum insert, rectangular
Second compression ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Taper face, cast iron, outside bottom step
Oil scraper ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coil spring loaded, chromium faced
Width of top ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tapered
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,475/2,49 mm (0.097/0.098 in)
Width of second ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,48/2,49 mm (0.097/0.098 in)
Width of third ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,47/3,49 mm (0.1366/0.1374 in)
Clearance of top ring in groove:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Wedge
- Engine types AR and AS only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,110/0,145 mm (0.004/0.006 in)
Clearance of second ring in groove. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,07/0,1 mm (0.003/0.004 in)
Clearance of third ring in groove . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,05/0,09 mm (0.002/0.003 in)
Gap of top ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . 0,28/0,63 mm (0.011/0.025 in)
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,28/0,51 mm (0.011/0.020 in)
Gap of second ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . 0,40/0,85 mm (0.016/0.034 in)
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,30/0,63 mm (0.012/0.025 in)
Gap of third ring:
- Engine types, AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . . 0,25/0,75 mm (0.010/0.031 in)
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,30/0,63 mm (0.012/0.025 in)
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Содержание New 1000 Series
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