Valve Timing; Connecting Rods; Piston Pins - International Harvester Company BD-144 Series Service Manual

7-1
BC-144 Series
80-144 Series
80-154 Series
VALVE PUSH RODS
Diameter
( in) 0.3125
0.3125 0.3125
Length
( in) 10.690/10.720
10.510/10.540 10.510/10.540
VALVE TIMING
Inlet opens
20
0
before TDC 20
0
before TDC
20
0
Before TDC
Inlet closes
40
0
after BDC 40
0
after BDC 40~ after BDC
Exhaust opens
40
0
before BDC 40
0
before BDC 40 before BDC
Exhaust closes
100 after TDC 10
0
after TDC 10
0
after TDC
TORQUE LOADINGS
Cylinder head bolts
(lb ft)
75/80 75/80
75/80
Nozzle body stud or
bolt to cylinder head (Ib ft)
20/30
20/30
Nozzle body nut to
stud (lb ft) 30/35 30/35
Tappet adjusting screw
nut
(lb ft)
20/25 20/25
20/25
Valve housing cover
nut (lb ft)
20/25
20/25 20/25
3. CONNECTINGRODS.
PISTONSAND CYLINDER
SLEEVES
CONNECTING RODS
Crankshaft bearing
diameter ( in) 1. 8755/1. 8760 1. 8755/1. 8760 1. 8755/1. 8760
Running clearance ( in) 0.001/ O.0029 O.001/ O.0029 O.001/ O.0029
Side clearance ( in) 0.003/0.010 0.003/0.010 0.003/0.010
Piston pin bush ID ( in) 1.1028/1.1031 1.1028/1.1031 1.1028/1.1031
PISTON PINS
Diameter
( in)
Standard 1.1021/1.1023 1.1021/1.1023 1.1021/1.1024
Oversize - marked +5 1. 1071/1. 1073 1.1071/1. 1073 1.1071/1.1074
Clearance between end
of pin and circlip ( in) O.OOS/ 0 .020
0.012/0.020
O.012/ O.021
Clearance in piston
( in) O.00025 Loose to 0.00025 Loose to O.0003 Loose to
O.00015 tight O.00015 tight O.0005 tight
Clearance in con rod (in) 0.0005/0.0010
o.
OOOS/ 0.0010 O.0005/ 0.0010
Length ( in) 2.898/2.902 2.898/2.902 3.019/3.024
PISTONS
Skirt clearance at bot-
tom 900 from pinhole ( in)
Graded 0.0031/0.0039 0.0031/0.0039
0.0031/ 0.0039
Individual replacements 0.0"039/0.0047
0.0039/ 0.0047 0.0039/0.0047
Number of rings 4 5
5