adapter, F-M.
Figure 3-58. Indicator valve, F-M.
76
taken, the pressure indicator is screwed on the end of the indicator valve. Opening of the valve backs a beveled collar seat on the valve stem against a beveled seat on the valve gland and closes small vent holes in the valve body. Pressure is then free to pass to the indicator without
leakage and burning of the valve stem which is not packed.
As the indicator valve is closed, the beveled collar is forced against the other seat in the inlet port, and the pressure in the indicator is free to escape through the vent holes in the valve body.
77
GENERAL MOTORS
ENGINE DATA, RATINGS, AND CLEARANCES
MAIN ENGINES AUXILIARY
ENGINE
Model number 16-278A 16-248 8-268
Number of cylinders 16 16 8 Bore and stroke 8 3/4 x 10 1/2 8 1/2 x 10 1/2 6 3/8 x 7
Brake horsepower (continuous) 1600 1600 437
Generator output 1134 kw 1134 kw 300 kw
Rated engine speed 750 rpm 756 rpm 1200 rpm
BMEP (continuous) 83.6 psi 88.6 psi 80.7 psi
Type of engine 2 cycle 2 cycle 2 cycle
Cylinder arrangement 40 degrees "V" 40 degrees "V" In line
Cylinder firing order for left-hand rotation
1-9-8-16-2-10- 6-14-4-12-5- 13-3-11-7-15
1-9-8-16-2-10- 6-14-4-12-5- 13-3-11-7-15
1-6-5-2- 8-3-4-7
Cylinder firing order or right-hand rotation
1-15-7-11-3- 13-5-12-4-14- 6-10-2-16-8-9
1-15-7-11-3- 13-5-12-4-14- 6-10-2-16-8-9
Starting system Air Air Air
Injection system Mechanical Mechanical Mechanical
Scavenging Uniflow Uniflow Uniflow
Operating Pressures of Full Load and Speed
Lub. oil-cooler to engine 40-50 psi 50 psi 35-45 psi
Fuel oil to injectors 40-50 psi 35 psi 50-60 psi
Sea water-pump to coolers 15-35 psi 34 psi 10-40 psi Fresh water-pump to engine 18-35 psi 31 psi 15-28 psi Starting air pressure to engine 500 psi 500 psi 500 psi
Operating Temperatures at Full Load and Speed
Max. exhaust at 3" Hg. back pressure
550-650 degrees F670 degrees F 650 degrees-750 degrees F
Lubricating oil-engine to cooler
Range 140-180 degrees F138 degrees-147
degrees F
140 degrees-180 degrees F
Preferred 170 degrees F 145 degrees F 170 degrees F
Lubricating oil-from cooler 130-160 degrees F114 degrees-119 degrees F
120 degrees-155 degrees F
Fresh water-engine to cooler
Range 140 degrees-170
degrees F
150 degrees-154 degrees F
140 degrees-180 degrees F
Preferred 160 degrees F 160 degrees F 160 degrees F
Fresh water-from cooler 105 degrees-130 degrees F
130 degrees-134 degrees F
115 degrees-135 degrees F
Sea water temperature rise through fresh water cooler
10-20 degrees F 17-19 degrees F 10-25 degrees F
Pressure Relief Valve Settings Lubricating oil regulating
At full load and speed 40-50 psi At 375 rpm - no load 8-12 psi
Lubricating oil at engine 50 psi 50 psi 35-45 psi
Fuel oil to injectors 40-50 psi 35 psi 50-60 psi
Miscellaneous
Overspeed trip setting 802 rpm 805 rpm 1350 rpm
Torque limits for bolts, studs-ft lb
Cylinder head studs 650 325
Connecting rod bolts 100 70
Main bearing bolts 550 300
Cylinder liner studs 175
78
Clearances of General Motors Principal Parts (in Inches)
Main Bearing Model
278A
Model 248
Model 268A
Model 268
Shell to Shaft Clearance (New) .006-.009 .006-.009 .0035-.0065
.0035-.0065
Shell to Shaft Clearance-Max. Allowable (Worn)
.030 .030 .020 .020
Min. Allowable Shell Thickness (Worn) .3601 .360 .240 .240
Thrust Bearing End Clearance-New .030-.035 .118-.125
.030-.035 .010-.013 .010-.013
Thrust Bearing End Clearance-Max.
Allowable (Worn)
31 .050 .025 .025
Connecting Rod
Shell to Shaft Clearance-New .0065-.0085
.0065-.0085
.0025-.0065
.0025-.0065
Shell to Shaft Clearance-Max. Allowable (Worn)
.025 .025 .010 .010
Min. Allowable Shell Thickness (Worn) .2381 .2381 .180 .180 Min. Allowable Piston Pin Dia. (Worn) 2.992 2.99266 2.620 2.620
Min. Allowable Piston Pin Bushing-Outer Dia. (Worn)
3.864 3.86466 Shrink fit Shrink fit
Max. Allowable Piston Pin Bushing-Inner Dia. (Worn)
3.012 3.01266 2.637 2.637
Clearance-Piston Pin to Conn. Rod Bushing .0025- .0025- .004-.0057 .004-.0057
New) .0045 .004566 .0022-.00378
.0022-.00378
Max. Allowable Piston Pin to Conn. Rod Bushing Clearance (Worn)
.015 .01566 .010 .010
Piston and Liner
Piston to Liner Clearance-New .0525-.05552
Max. Allowable Piston to Liner Clearance (Worn) Min. Allowable Piston Dia. (Worn) 8.7204 8.4754 6.4804 6.3554 Max. Allowable Liner Dia. (Worn) 8.775 8.525 6.520 6.395
Max. Allowable Liner Out of Roundness (Worn)
.007 .007 .005 .005
Max. Piston Pin Bushing Dia. (Worn) 3.008 3.008 2.632 2.632
Piston Pin to Piston Bushing Clearance-New
Piston Pin to Piston Bushing Clearance-Max. Allowable (Worn)
.016 .016 .012 .012
Piston Rings19
Compression-Gap Clearance (New) .030-.050 .030-.050 .025-.040 .025-.040 Oil Control-Gap Clearance (New) .030-.050 .030-.050 .026-.041 .026-.041 Compression-Gap Clearance-Max. Worn .100 .100 .100 .100 Oil Control-Gap Clearance-Max. Worn .100 .100 .100 .100
Compression-Side Clearance (New) .008-.01056 .004-.00656
.008-.01055 .004-.00656
.0075-.01005 .0045-.007012
.0030-.005566
Oil Control-Side Clearance (New) .002-.0045.002-.0045 .0025-.0055
.0020-.0045
Compression-Side Clearance-Max. (Worn) .020 .020 .012 .012 Oil Control-Side Clearance-Max. (Worn) .020 .020 .012 .012
Camshaft
Min. Shell Thickness (Worn) .117 .180 .092 .092
Clearance Shell to Shaft-(New) .0035-.0061
.0025-.0045
.0025-.0055
.0025-.0055
Max. Allowable Shell to Shaft Clearance (Worn)
.010 .010 .010 .010
Valves
Exhaust Valve Tappet Clearance (Cold) .015 .01565 .018 .018
Exhaust Valve Guide to Valve Stem Clearance-New
.002-.004 .002-.004 .003-.005 .003-.005
Max. Allowable Exhaust Valve Guide to Valve Stem Clearance (Worn)
.012 .012 .010 .010
Miscellaneous
Injection Nozzle Opening Pressure 100067 320068
3200 100067 320068
100067 320068 Injector Tappet Clearance
Injector Timing (BTC) 7
degrees32
7 degrees3212 degrees32
12 degrees32 Lube Oil Recommended-Navy Symbol (First 9370- 9370- 9370- 9370-(9250)
Choice Substitute in Paren.) (9250) (9250) (9250)
1 For Satco shells only-replace Tri-metal bearings when intermediate bronze lining starts to show through
8 Bushing with two radial holes
2 At top of piston 9 Bottom of taper below fourth
ring groove
3 Between fourth and fifth ring grooves 31 Replace when backing begins to show through bearing metal
4 At skirt 32 Position of flywheel for checking
injector with injector timing tool
5 First and second rings from top 66 Engines with C. I. pistons
6 Third, fourth, and fifth rings from top 67 Spherical check valve type
7 Bushing with six radial holes 68 Needle valve type
79
FAIRBANKS-MORSE
ENGINE DATA, RATINGS, AND CLEARANCES
MAIN ENGINES AUXILIARY ENGINE
Model number 38D 8 1/8 38D 8 1/8 38E 5 1/4
Number of cylinders 10 9 7
Bore and stroke 8 1/8 x 10 8 1/8 x 10 5 1/4 x 7 1/4
Brake horsepower
Emergency 1600 hp @ 720
rpm
1600 hp @ 720 rpm
Continuous 1280 hp @ 650 rpm
1280 hp @ 650 rpm
Generator output
Emergency 1120 kw @ 720
rpm
1120 kw @ 720 rpm
300 kw
Continuous 900 kw @ 650 rpm 900 kw @ 650 rpm
Rated engine speed - - 1200 rpm
BMEP (continuous) 84 psi 94.3 psi 64.3 psi
Type of engine 2 cycle 2 cycle 2 cycle
Cylinder arrangement Opposed Opposed Opposed
Cylinder firing order for left-hand rotation
1-8-7-3-5-9-4-2-10-6
1-9-2-7-4-5-6-3-8 1-7-2-5-4-3-6
Cylinder firing order for right-hand rotation
1-6-10-2-4-9-5-3-7-8
1-8-3-6-5-4-7-2-9
Starting system Air Air Air
Injection system Mechanical Mechanical Mechanical
Scavenging Uniflow Uniflow Uniflow
Operating Pressures at Full Load and Speed
Lub. oil-cooler to engine 50 psi 50 psi 40 psi
Fuel oil to injectors 25 psi 25 psi 25 psi
Starting air pressure to engine250 psi 250 psi 250 psi
Operating Temperatures at Full Load and Speed
Maximum exhaust, individual cylinder
770 degrees F 770 degrees F 590 degrees F
Lubricating oil-engine to cooler
Range 140 degrees-180 125 degrees-190 140 degrees-180
degrees F degrees F degrees F
Preferred 165 degrees F 150 degrees-170 degrees
F 165 degrees F
Fresh water-engine to cooler
Range 140 degrees-170
degrees F
120 degrees-190 degrees F
140 degrees-170 degrees F
Preferred 160 degrees F 150 degrees-170 degrees F
160 degrees F
Oil Pressures
Lubricating oil-engine upper header
17-32 psi 17-32 psi 2147 psi
-Fuel oil to fuel injection pump5-20 psi 5-20 psi 7-21 psi
Miscellaneous
Overspeed trip setting 778-835 rpm 800 rpm 1290-1370 rpm
Clearances of Principal Parts (in Inches)
Camshaft bearings 0.0035-0.0060 0.0035-0.0060 0.0015-0.0040 Connecting rod bearings 0.0050-0.0075 0.0050-0.0075 0.0030-0.0055 Main bearings 0.0090-0.0115 0.0090-0.0115 0.0070-0.0095 Main thrust bearings-width 0.0050-0.0100 0.0050-0.0100 0.0050-0.0110 Piston diameter 0.0085-0.0135 0.0095-0.0125 0.0080-0.0100 Piston rings:
Compression rings (top 2)
side clearance 0.0080-0.0100 0.0080-0.0100 0.0090-0.0110 gap clearance 0.0300-0.0400 0.0300-0.0400 0.0200-0.0300 Compression rings (3 and 4)
side clearance 0.0050-0.0080 0.0050-0.0075 0.0070-0.0090 gap clearance 0.0300-0.0400 0.0300-0.0400 0.0200-0.0300 Oil rings
oil cutter ring, side 0.0005-0.0020
oil cutter ring, gap 0.0250-0.0300
other oil rings, side 0.0015-0.0045 0.0015-0.0040 0.0030-0.0036 other oil rings, gap 0.0150-0.0250 0.0150-0.0250 0.0150-0.0250 Piston pin bearing 0.0055-0.0065 0.0020-0.0034 0.0015-0.0029 Vertical drive gears Backlash 0.0120-0.0160 0.0120-0.0160 0.0030-0.0100