Volvo Penta D25A MS, Operator'S Manual

Page: 79 / 87

79
Technical Data
Important Bolts and Nuts D30
Thread Torque
Description Diam.xPitch Nm kpm lbf.ft Notes
(M-Thread)
Cylinder Head 22 x 2,5 539 55 398 (a)(b)(c)
Cylinder head nozzle gland (studs) 14 x 2,0 69-78 7-8 51-58
Rocker case 12 x 1,25 108 11 80
Rocker shaft 14 x 2,0 147 15 108
Rocker arm lock nuts 12 x 1,25 64 6,5 47
Bridge lock nuts 10 x 1,25 55 5,6 40
Camshaft gear 12 x 1,25 127 13 94
Camshaft thrust plate 12 x 1,25 59 6 43
Main bearing caps 22 x 2,5 490 50 362 (a)
Hanger 12 x 1,25 108 11 80
Piston cooling nozzle 12 x 1,75 34 3,5 25 (d)
Timing gear case 16 x 1,5 216 22 159
Rear plate 12 x 1,25 108 11 80
Oil pan 12 x 1,25 59 6 43
Front mounting bracket 12 x 1,25 108 11 80
Rear mounting bracket 16 x 1,5 216 22 159
Connecting rod bearing caps 22 x 1,5 539 55 398 (a) (e)
Flywheel 22 x 1,5 539 55 398 (a)
Viscous damper 22 x 1,5 490 50 362
Rear idler shaft 12 x 1,25 108 11 80
Rear idler shaft thrust plate 10 x 1,25 29 3 22
Exhaust manifold V-clamp nuts 8 x 1,25 19,6 2 14,5
Exhaust manifold mounting bolts 1/4 x 28 9 0,9 6,5 UNF
Exhaust pipe V-clamps 10 x 1,5 98 10 72
Oil pump 12 x 1,25 108 11 80
Oil pump cover 10 x 1,25 26,3-39,7 2,7-4,1 18-32
Fresh water pump 12 x 1,25 59 6 43
Fresh water pump shaft pulley (nuts) 24 x 1,5 245 25 181 For alternator drive.
(a) Wet , apply lubrication oil to the threads of the nut and bolt.
(b) 2-step tightening method,
(c) Tighten cylinder head bolts according to the angle method, tighten to 294 Nm [30 kpm; 217 lbf.ft], then tighten 60° more.
(d) Extremely important to use torque wrench in tightening the piston cooling nozzles. Failure to do so may result in excessive
tightening torque, which may cause valve malfunctions that could lead to seizing of pistons due to insufficient lubrication.
(e) Tighten connecting rod caps according to the angle method, tighten to 245 Nm [25 kpm; 181 lbf.ft], then tighten 60° more.
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