855268 Volvo.Penta Acceleration pump

General
Table 1
Inspection point     Nominal     Standard     Limit     Remark    
Maximum rotation speed (rated rotation speed used as reference)     Varies depending on the specifications         Adjust governor setting.    
Minimum rotation speed    
Compression pressure    
2.94 MPa (427.00 psi)        
2.55 MPa (370.00 psi)     When oil and water temperatures at
20 to 30 °C (68 to 86 °F) (150 to 200 rpm) or more    
Engine oil pressure     at 750 rpm    
0.1 MPa (14.0 psi) or more    
0.05 MPa (7.00 psi)        
at 1500 rpm
0.29 to 0.49 MPa (42.00 to 71.00 psi)    
0.15 MPa (21.00 psi)     When oil temperature is
70 to 90 °C (158 to 162 °F)    
Valve timing     Inlet valve Open     BTDC 30 degrees     3 degrees         (Crank angle)    
Inlet valve Close ABDC 50 degrees    
Exhaust valve Open BBDC 74 degrees    
Exhaust valve Close ATDC 30 degrees    
Valve clearance (when cold)        
0.250 mm (0.0098 inch)         Both inlet and exhaust    
Fuel injection timing     Varies depending on the specifications            
Fan belt deflection (crankshaft pulley to alternator pulley)         Approx.
13.0 mm (0.51 inch)         Amount of deflection when pressed with the thumb firmly.
98 N (22 lb)    Basic engine
Table 2
Inspection point    Nominal    Standard    Limit    Remark    
Rocker     Rocker arm inside diameter    
19.0 mm (0.75 inch)    
19.010 to 19.030 mm (0.7484 to 0.7492 inch)            
Rocker shaft outside diameter
19.0 mm (0.75 inch)    
18.980 to 19.000 mm (0.7472 to 0.7480 inch)            
Clearance between rocker arm and shaft    
0.010 to 0.050 mm (0.0004 to 0.0020 inch)    
0.070 mm (0.0028 inch)        
Valve and valve guide     Valve stem outside diameter     Inlet    
8.0 mm (0.31 inch)    
7.940 to 7.955 mm (0.3126 to 0.3132 inch)    
7.900 mm (0.3110 inch)        
Exhaust
8.0 mm (0.31 inch)    
7.920 to 7.940 mm (0.3118 to 0.3126 inch)    
7.850 mm (0.3091 inch)        
Clearance between valve stem and guide Inlet        
0.045 to 0.075 mm (0.0018 to 0.0030 inch)    
0.130 mm (0.0051 inch)        
Exhaust    
0.060 to 0.095 mm (0.0024 to 0.0037 inch)    
0.150 mm (0.0059 inch)        
Height to top of valve guide
15.50 mm (0.610 inch)    
15.10 to 15.60 mm (0.594 to 0.614 inch)            
Valve seat     Valve seat angle (B)     30 degrees             Refer Illustration 1    
Valve sinkage (D)
0.80 mm (0.031 inch)    
0.70 to 0.90 mm (0.028 to 0.035 inch)    
1.30 mm (0.051 inch)    
Seat width (A)
1.180 mm (0.0465 inch)    
1.040 to 1.320 mm (0.0409 to 0.0520 inch)    
1.60 mm (0.063 inch)    
Valve margin (C)
1.70 mm (0.067 inch)         Refacing permissible up to
1.20 mm (0.047 inch)    
Valve spring     Free length (G)        
48.850 mm (1.9232 inch)    
47.600 mm (1.8740 inch)     Refer Illustration 2    
Perpendicularity (F)     Θ (E) = 1.5 Δ =
1.3 mm (0.051 inch) Lf =
48.850 mm (1.9232 inch)     Δ =
1.50 mm (0.059 inch) at the end    
Set length/set load    
43.0 mm (1.69 inch) /
176 to 196 N (40 to 44 lb)    
43.0 mm (1.69 inch) /
147 N (33 lb)        
Push rod     Runout        
0.30 mm (0.012 inch) or less         Runout (dial gauge reading) when pushrod is supported along center line of spherical surface at either end.    
Cylinder head     Distortion of bottom face        
0.050 mm (0.0020 inch) or less    
0.200 mm (0.0079 inch)     Reface minimum thickness.    
Compressed thickness of gasket
1.300 mm (0.0512 inch)    
1.270 to 1.370 mm (0.0500 to 0.0539 inch)            
Piston     Outside diameter     STD    
87.970 mm (3.4634 inch)    
87.955 to 87.985 mm (3.4628 to 3.4640 inch)    
87.770 mm (3.4555 inch)        
0.250 mm (0.0098 inch) O/S
88.220 mm (3.4732