The Caterpillar G3508 is a 34.5 L 8-cylinder ta engine rated at 1200 rpm, producing up to 472 kW. It powers generator sets from Caterpillar. It holds 356 L (94.0 gal) of oil and 114 L (30.1 gal) of coolant.
Also known as: Caterpillar G3508, G3508
| Oil capacity | 356.0 L |
|---|---|
| Coolant capacity | 114.0 L |
| Displacement | 34.5 L |
| Cylinders | 8 |
| Aspiration | TA |
| Rated speed | 1200 rpm |
| Gross power | 472 kW |
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| oil | Change | 500 hr | 3000 Series service intervals increased to 500 hours as standard (3013C, 3024C, 3054, 3056) | |
| minor overhaul | Other | 20000 hr | 3600 engines designed to run 20 000 hours between minor overhauls using No. 2 fuel | |
| major overhaul | Other | 40000 hr | 3600 engines designed to run 40 000 hours between major overhauls using No. 2 fuel | |
| cylinder liners and pistons | Other | 80000 hr | 3600 cylinder liners and pistons designed for 80 000 hours using No. 2 fuel |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Crankshaft end play | .178 to .635 | mm (0.0070 to 0.0250 inch) | measured with dial indicator |
| Clearance | Crankshaft end play after assembly | 0.178 to 0.635 | mm (0.0070 to 0.0250 inch) | after assembly |
| Clearance | End play at heat sink after assembly | 0.076 to 0.635 | mm (0.0030 to 0.0250 inch) | after assembly |
| Clearance | Gap at 3, 6, 9, 12 o'clock positions | 0.03 to 0.13 | mm (0.001 to 0.005 inch) | between |
| Clearance | Gap between generator and flywheel housing at locations (E), (F), (G), (H) | >0.03 and <0.13 | mm (0.001 inch to 0.005 inch) | more than 0.03 mm and less than 0.13 mm |
| Clearance | Generator forward offset from midpoint of end play | + 0.50 | mm (+ 0.0200 inch) | while generator supported by crane |
| Clearance | Rotor end play | 3.81 to 7.62 | mm (.150 to .300 inch) | approximately |
| Clearance | Shim thickness divisor for number of shims | 0.8 | mm (0.03 inch) | divide Letter L by this value |
| Clearance | Support deflection during bolt tightening | 0.13 | mm (0.005 inch) | maximum allowed movement |
| Other | Gross Input Torque (TH55-E70) | 12 667 | N•m (9350 lb-ft) | |
| Other | Gross Input Torque (TH55-E90) | 12 677 | N•m (9350 lb-ft) | |
| Other | Rating condition (diesel 7 L and higher) | 99 kPa (29.31 in Hg) dry barometer, 25°C (77°F) | SAE J1995 inlet air standard | |
| Other | Rating condition (diesel up to 6.6 L) | 100 kPa (29.5 in Hg) total barometric pressure, 1 kPa (.295 in Hg) vapor pressure, 25°C (77°F) | ISO/TR14396 inlet air standard | |
| Other | Rating condition (gas) | 100 kPa (29.61 in Hg) and 25°C (77°F) | SAE J1349 standard | |
| Other | Stall Torque Ratio (TH55-E70) | 2.23 | ||
| Other | Stall Torque Ratio (TH55-E90) | 2.23 | ||
| Pressure | Explosion relief valve opening pressure | 1.6 psi (11 kPa) | psi (kPa) | per valve |
| Pressure | Gas Pressure | 35 | psi (242 kPa) | |
| Pressure | Unit injector fuel injection pressure | 1240 | bar (18 000 psi) | |
| Pressure | WS255 pump plunger load | 238,000 | lb (107,960 kg) | |
| Pressure | WS273XD pump plunger load | 275,000 | lb (124 738 kg) | |
| Pressure | WS305XD pump plunger load | 250,000 | lb (113 398 kg) | |
| Speed | Engine Speed | 1400 | rpm | |
| Speed | Maximum Input Speed (TH55-E70/TH55-E90 transmissions) | 1970 | rpm | |
| Speed | Rated Input Speed (TH55-E70/TH55-E90 transmissions) | 1900 | rpm | |
| Torque | Bolts (10) | 100 | N-m (75 lb ft) | Tighten in pairs at 180 degree intervals in three stages |
| Torque | Bolts (7) for shim pack and plate assembly | 525 + 45 | N-m (390 + 30 lb ft) | Tighten bolts (7) |
| Torque | Coupling plate assembly bolts (5) | 525 + 25 | N-m (390 + 20 lb ft) | Tighten in 180 degree intervals in three stages |
| Torque | Fan mounting bolts (11) | 200 | N-m (150 Ib ft) | Tighten in pairs at 180 degree intervals in three stages |
| Torque | Generator mounting bolts (half of standard torque) | 450 | N-m (332 lb ft) | one half of standard torque |
| Torque | Generator support bolts (half of final torque) | 450 | N-m (332 Ib ft) | half of final torque |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | Cat DEAC | Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis | |||
| Coolant | Cat ELC | Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis | |||
| Coolant | Cat NGEC | Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first | |||
| Engine oil | EPA 2D 89.330-96 (fuel reference, Diesel <6.6 L, density 0,845-0,850 kg/L a 15 °C) | Reference condition only, not a lubricant recommendation | |||
| Engine oil | Cat NGEO | Natural Gas | |||
| Engine oil | low sulfated ash oil | Required for U.S. EPA Tier 4 Final, EU Stage IV engines. | |||
| Engine oil | Cat Arctic DEO SYN SAE 0W-30 | -40°C to 30°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SYN SAE 5W-40 | -30°C to 50°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SAE 10W-30 | -18°C to 40°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SAE 15W-40 | -9°C to 50°C | Engine Crankcase; Industrial Engines | ||
| Fuel | Ultra Low Sulfur Diesel (ULSD) | Contains less than or equal to 15 parts per million sulfur (mg/kg); required for U.S. EPA Tier 4 Final, EU Stage IV engines. B20 biodiesel capability available. | |||
| Fuel | 35° API gravity, LHV 42 780 kJ/kg (18,390 btu/lb) | SAE J1995 | Diesel engines 7 liter and higher; used at 29°C (84.2°F) with density 838.9 g/L | ||
| Fuel | EPA 2D 89.330-96 | EPA 2D 89.330-96 | Diesel engines up to 6.6 liter; density 0.845-0.850 kg/L @ 15°C (59°F); fuel inlet temperature 40°C (104°F) | ||
| Fuel | No. 2 fuel | 3600 engines designed for 80 000 hours on No. 2 fuel; ratings based on API gravity of 35 at 15 C (60 F), LHV of 42 780 kJ/kg used at 29 C (84 F) with a density of 838.9 g/L | |||
| Fuel | dry natural gas, LHV 35.54 MJ/Nm3 (905 btu/ft3) | Gas ratings based on SAE J1349 standard conditions of 100 kPa (29.61 in Hg) and 25°C (77°F) | |||
| Fuel | natural gas | LHV 35.54 MJ/Nm3 (905 Btu/cu-ft); pipeline natural gas HHV 39.7 MJ/Nm3 (1010 Btu/cu-ft); HD-5 propane HHV 104.0 MJ/Nm3 (2645 Btu/cu-ft) | |||
| Grease | Cat Generator Set Grease | Part Number 108-8611 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Tools: crane, dial indicator, shims, torque wrench
Tools: shims, torque wrench
Tools: torque wrench, shims
⚠ Damage to engine and generator can result if electric set is operated with a plate assembly that does not have proper clearance.
⚠ If N or O is less than initial A, disassemble and check coupling plate for bowing; replace if bowed.
Tools: dial indicator, straight edge, magnetic bases, crane, torque wrench, 17 5N-4478 Plates
⚠ Damage to engine and generator can result if electric set is operated with a plate assembly that does not have proper clearance.
Tools: dial indicator, indicator assembly, bar, torque wrench, guide bolt, crane
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
The Caterpillar G3508 engine has an oil capacity of 356.0 liters.
The Caterpillar G3508 has a displacement of 34.5 liters with 8 cylinders.
The Caterpillar G3508 powers 1 generator set(s), including Caterpillar G3508.