Perkins 2800 - Pistons and Connecting Rods Specifications

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Workshop Manual, TSD3450E, Issue 1 13
2800
Pistons and connecting rods
Piston ring gaps measured with the ring fitted in a new liner with a bore size 139,66 mm (5.498 in):
Top piston ring (F4) . ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,50 +/- 0,10 mm (0.020 +/- 0.004 in)
Intermediate ring (F3).. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,83 +/- 0,15 mm (0.033 +/- 0.006 in)
Oil control ring (F2).. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,450 +/- 0,150 mm (0.0177 +/- 0.0059 in)
Width of groove for oil control ring in new piston. ... ... ... ... ... ... ... 4,033 +/- 0,013 mm (0.1588 +/- 0.0005 in)
Thickness of a new oil control ring .. ... ... ... ... ... ... ... ... ... ... ... ... 3,980 +/- 0,010 mm (0.1567 +/- 0.0004 in)
Clearance between piston ring groove and new oil control ring.. ... 0,053 +/- 0,023 mm (0.0021 +/- 0.0009 in)
Maximum permissible clearance between piston
ring groove and new oil control ring. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0,15 mm (0.006 in)
Bore of piston crown bearing (F1) ... ... ... ... ... ... ... ... ... ... ... . 55,0355 +/- 0,0055 mm (2.1667 +/- 0.0002 in)
Bore of piston skirt bearing (F1) .. ... ... ... ... ... ... ... ... ... ... ... ... . 55,020 +/- 0,005 mm (2.1661 +/- 0.0002 in)
Gudgeon pin diameter (F1) . ... ... ... ... ... ... ... ... ... ... ... ... ... ... . 55,000 +/- 0,005 mm (2.1654 +/- 0.0002 in)
Length of gudgeon pin. ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 113,20 +/- 0,15 mm (4.457 +/- 0.006 in)
Bore in connecting rod for small end bearing (F7) .. ... ... ... ... ... . 59,640 +/- 0,013 mm (2.3480 +/- 0.0005 in)
Bore of connecting rod small end bearing (F6) ... ... ... ... ... ... ... . 55,035 +/- 0,008 mm (2.1667 +/- 0.0003 in)
Bore in connecting rod for big end bearing shells (F5) ... ... ... ... . 96,200 +/- 0,013 mm (3.7874 +/- 0.0005 in)
Distance between centres of big and small end bearings (F8) ... ... . 261,62 +/- 0,05 mm (10.300 +/- 0.002 in)