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Hallo teman - teman dhevils mechanic, ketemu lagi dengan tulisan - tulisan dhevils mechanic ya ng pasti tak jauh dengan dunia mechanic Oil and Gas Industry. Dimana sering kita ulas terkiat spec suatu peralatan, troubleshot, maupun ide - ide creative dalam menyeleseikan permasalahan yang terjadi di dunia mechanic. dan kali ini yuk kita berkisah terkait Ajax gas engine compressor, terkait clearence dan torque pada unit - unit ajax
Untuk Perawatannya unit ajx ini sangat simple karena selain mengadopsi model 2 stroke engine juga integral engine sehingga tidak banyak part yang digunakannya, untuk system instrumentasinya juga simple karena sebagian besar masih mengunakan type peneumatic control system.
Nah sebagai seorang mechanic kita harus paham ukuran - ukuran clearance dan torque yang dibutuhkan pada setiap bagian - bagiannya, dan berikut ini coba kita share yang diambil dari berbagai sumber yang ada.
CLEARANCE AND TORQUE VALUES (cont’d)
Description DPC-300 DPC-360&2802
Clearances:
Roller Main Bearing:
- Fit to Shaft (tight) 002-.004 . 002-.004
- Bench Lateral (installed loose) .0003-.0074 .0021-.0085
Center Main Bearing: .004-.007 .004-.007
Crankpin Bearing-Power .003-.006 .003-.006
- Side Clearance .010-.026 .010-.026
- Compressor .003-.006 .003-.006
- Side Clearance .010-.026 .010-.026
Crosshead Pin Bearing-Power .0044-.0074 .0044-.0074
- Compressor .003-.006 .0035-.0055
Crosshead to Guide-Power .008-.012 .009-.015
- Compressor .012-.015 .012-.015
Piston to Power Cylinder:
- Skirt .027-.033 .027-.033
- Below 3rd Comp. Ring .067-.076 .067-.076
- 3rd Ring Land .142-.151 .142-.151
- 2nd Ring Land .142-.151 .142-.151
- 1st Ring Land .152-.161 .152-.161
Piston Ring End Gap .115-.135 .115-.135
Piston Ring to Side of:
- 1st & 2nd Groove .010-.0125 .010-.0125
- All Other Grooves .008-.0105 .008-.0105
Piston Crown to Head
Gasket Surface (distance) 2.250” 2.250”
Layshaft Drive Gear Backlash .003-.005 .003-.005
Layshaft End Play .005 .005
Mag Drive Shaft End Play .003-.014 .003-.014
Governor Drive Shaft End Play .003-.006 .003-.006
Flywheel Rim Runout
(external start) .020 .020
Mixer Manifold
(min. thickness after regrind)
- Old Style 4.425” 4.425”
- New Plate Style (square) .562” . 562”
Torque Values
(ft. lbs. for lubricated threads):
Connecting Rod Bolts
- Power-End 650-700 650-700
- Compressor-End 650-700 650-700
Cylinder Heads Stud Nuts 600 600
Piston Rod to Crosshead Nuts 3200 3200
Crosshead Pin Lock Screws 50 50
Piston Rod Lock Screws 50 50
Flywheel Bolt and Nuts 520 520
Cooler Drive Sheave Bolt/Nuts 225 225
Power Cyl. to Frame Studs 490 490
Main Bearing Support to Frame 150 150
Center Main Cap Bolts 250-265 250-265
Center Main Carrier to Frame Bolts 95 95
Compressor Guide to Frame Studs 280-300 280-300
B. CLEARANCE AND TORQUE VALUES (cont’d)
Description DPC-600&2803 DPC-800&2804
Clearances:
Main Bearing: .0046-.0076 .0046-.0076
Thrust Bearing Side Clearance .008-.018 .008-.018
Crankpin Bearing-Power .003-.006 .003-.006
- Side Clearance .010-.026 .010-.026
- Compressor .003-.006 .003-.006
- Side Clearance .022-.036 .022-.036
Crosshead Pin Bearing-Power .0044-.0074 .0044-.0074
- Compressor .0035-.0055 .0035-.0055
Crosshead to Guide-Power .009-.013 .009-.015
- Compressor .012-.015 .012-.015
Piston to Power Cylinder:
- Skirt .027-.033 .027-.033
- Below 3rd Comp. Ring .077-.086 .077-.086
- 3rd Ring Land .142-.151 .142-.151
- 2nd Ring Land .142-.151 .142-.151
- 1st Ring Land .152-.161 .152-.161
Piston Ring End Gap .115-.135 .115-.135
Piston Ring to Side of:
- 1st & 2nd Groove .010-.0125 .010-.0125
- All Other Grooves .008-.0105 .008-.0105
Piston Crown to Head
Gasket Surface (distance) 2.250” 2.250”
Layshaft Drive Gear Backlash .003-.005 .003-.005
Layshaft End Play .005 .005
Mag Drive Shaft End Play .003-.014 .003-.014
Governor Drive Shaft End Play .003-.006 .003-.006
Flywheel Rim Runout (external start) .020 .020
Mixer Manifold (min. thickness after regrind:
- New Plate Style (square) .562” .562”
Torque Values (ft. lbs. for lubricated threads):
Connecting Rod Bolts
- Power-End 650-700 650-700
- Compressor-End 650-700 650-700
Frame Tie-Bar Bolts 260 260
Main Cap Studs (in frame) 250 250
Main Cap Nuts 360 360
Cylinder Heads Stud Nuts 600 600
Piston Rod to Crosshead Nuts 3200 3200
Crosshead Pin Lock Screws 50 50
Piston Rod Lock Screws 50 50
Flywheel Bolt and Nuts (split style) 520
Flywheel Bolts (Ringfeder) 185
Cooler Drive Sheave Bolt/Nuts. 225
Cooler Drive Sheave (Ringfeder) 185
Vibration Damper Bolts 225
Power Cyl. to Frame Studs 490 490
Compressor Guide to Frame Studs 280-300 280-300
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C. Wear Limits 13-1/4” and 15” Bore Units ONLY
Description As New Limits Max. Acceptable
Power-End
13-1/4” Cylinder Bore 13.247-13.251 13.263, Max of .002 TIR
13-1/4” Piston Skirt Diameter 13.220-13.222 13.213
13-1/4” Piston-to-Cylinder Clearance .025-.031 .045
13-1/4” Piston Ring 1 & 2 Side Clearance .010-.0125 .015
13-1/4” Piston Ring 3 & 4 Side Clearance .008-.0105 .013
13-1/4” Piston Ring End Gap .100-.126 .145
15” Cylinder Bore 14.997-15.001 15.013, Max of .002 TIR
15” Piston Skirt Diameter 14.968-14.970 14.961
15” Piston-to-Cylinder Clearance .027-.033 .045
15” Piston Ring 1 & 2 Side Clearance .010-.0125 .015
15” Piston Ring 3 & 4 Side Clearance .008-.0105 .013
15” Piston Ring End Gap .115-.135 .145
Piston Rod O.D. 2.497-2.500 2.495
Crosshead Guide 12.000-12.002 12.004
Crosshead O.D. 11.987-11.989 11.985
Crosshead-to-Guide Clearance .009-.013 .016
Connecting Rod Pin Bushing I.D. 5.5044-5.5069 5.509
Connecting Rod Side Clearance .010-.026 .029
Crosshead Pin O.D. 5.4995-5.500 5.4985, Max .001 TIR
Crosshead-to-Pin Clearance .0044-.0074 .0085
Connecting Rod Bearing Bore 7.503-7.505 7.507, Max .001 TIR
Crank Pin O.D. 7.499-7.500 7.4975, Max .0015 TIR
Crank Pin-to-Bearing I.D. Clearance .0044-.006 .0075
Main Bearing Journal O.D. 8.374-8.375 8.3725
Main Bearing I.D. 8.3796-8.3816 8.3831, Max .002 TIR
Main Journal-to-Bearing I.D. Clearance .0046-.0076 .0091
Main Bearing Thrust (600, 800, 2803 & 2804 only) .010-.020 .022
Layshaft Bearing Bore 1.502-1.503 1.504
Layshaft O.D. 1.498-1.500 1.497
Layshaft O.D.-to-Bearing Clearance .002-.005 .007
Center Main Bearing I.D. (2 cyl units only) 7.754-7.756 7.757
Crankshaft Journal O.D. (2 cyl units only) 7.749-7.750 7.748
Center Main-to-Journal Clearance (2 cyl only) .004-.007 .0084
Note: Specific Unit Performance and Maintenance Requirements May Vary Based on
Application Conditions and Maintenance Practices.
These Component Dimensional Specifications and Wear Limits Should Be Used as a Guide
for Maintenance Programs for Ajax Equipment
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C. Wear Limits 13-1/4” and 15” Bore Units ONLY
Description As New Limits Max. Acceptable
Compressor-End
Piston Rod, 2-1/2” 2.497-2.500 2.495
Piston Rod, 2-1/4” 2.249-2.250 2.2455
Crosshead Guide 11.999-12.001 12.008
Crosshead O.D. 11.984-11.986 11.982
Crosshead-to-Guide Clearance .011-.015 .018
Connecting Rod Pin Bushing I.D. 4.5035-4.5062 4.507
Crosshead Pin O.D. 4.4995-4.500 4.4985
Crosshead-to-Pin Clearance .0044-.006 .0066
Connecting Rod Bearing I.D. 7.503-7.505 7 .506
Crank Pin O.D. 7.499-7.500 7.498
Crank Pin-to-Bearing Clearance .0042-.0066 .008
Demikianlah terkait guiden dalam merawat unit gas engine kompressor merk ajax, semoga dapat membuka wawasan kita terkait dunia mechanic oil and gas.
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