The Caterpillar 3508B is a 34.5 L 8-cylinder ta engine rated at 1800 rpm, producing up to 698 kW. It powers generator sets from Caterpillar, including the 3508. It holds 397 L (104.9 gal) of oil and 103 L (27.2 gal) of coolant.
Also known as: Caterpillar 3508B, 3508B
The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.
Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.
| Oil capacity | 397.0 L |
|---|---|
| Coolant capacity | 103.0 L |
| Displacement | 34.5 L |
| Cylinders | 8 |
| Aspiration | TA |
| Rated speed | 1800 rpm |
| Gross power | 698 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air conditioner | R134a | Amazon Amazon eBay $585.30 eBay FridayParts $25.50 | ||
| Oil filter | 175-7546 | Amazon eBay | |||
| Battery | 245-5829 | Amazon eBay $98.00 | |||
| Coolant | 294-7420 | Amazon eBay | |||
| Oil | 227.1 L | — | 500 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| System | Test | 1 hr | ToCI quarterly: exercise system under full load for 1 hour | |
| Battery Electrolyte Level | Check | 250 hr | Every 250 Service Hours | |
| Belts | Inspect | 250 hr | Inspect/Adjust/Replace; Every 250 Service Hours | |
| Cooling System Coolant Sample (Level 1) | Other | 250 hr | Obtain; Every 250 Service Hours | |
| Cooling System Supplemental Coolant Additive (SCA) | Test | 250 hr | Test/Add; Every 250 Service Hours | |
| Engine Oil Sample | Other | 250 hr | Obtain; Every 250 Service Hours | |
| Engine Oil Sample | Test | 250 hr | Every 250 Service Hours - Obtain | |
| Engine Valve Lash | Adjust | 4000 hr | First service — Inspect/Adjust; Initial 250 Service Hours | |
| Fan Drive Bearing | Lubricate | 250 hr | Every 250 Service Hours | |
| Fuel Injector | Adjust | 4000 hr | First service — Inspect/Adjust; Initial 250 Service Hours | |
| Hoses and Clamps | Inspect | 250 hr | Inspect/Replace; Every 250 Service Hours | |
| Radiator | Clean | 250 hr | Every 250 Service Hours | |
| Speed Sensor | Clean | 250 hr | First service — Initial 250 Service Hours (Prime Power) - Clean/Inspect | |
| Air Shutoff | Test | 500 hr | Every 500 Service Hours (Prime Power) | |
| Cooling System Coolant Sample (Level 1) | Test | 500 hr | Every 500 Service Hours (Prime Power) | |
| Cooling System Coolant Sample (Level 2) | Test | 500 hr | First service — Initial 500 Hours for new, refilled and converted systems | |
| Engine Oil and Filter | Change | 500 hr | Every 500 Service Hours - standard sump; deep sump every 1000 hours | |
| Magnetic Pickups | Clean | 500 hr | First service — Clean/Inspect; Initial 500 Service Hours or at first oil change | |
| Cooling System Coolant Sample (Level 2) | Other | 1000 hr | Obtain; Every 1000 Service Hours | |
| Engine | Clean | 1000 hr | Every 1000 Service Hours | |
| Engine Crankcase Breather | Clean | 1000 hr | Every 1000 Service Hours | |
| Engine Protective Devices | Check | 1000 hr | Every 1000 Service Hours | |
| Engine Protective Devices | Test | 1000 hr | Check; Every 1000 Service Hours | |
| Fuel System Primary Filter | Replace | 1000 hr | Every 1000 Service Hours - Clean/Inspect/Replace | |
| Fuel System Secondary Filter | Replace | 1000 hr | Every 1000 Service Hours | |
| Generator Winding Insulation | Test | 1000 hr | Every 1000 Service Hours | |
| Rotating Rectifier | Inspect | 1000 hr | 12 mo | Every 1000 Service Hours or 1 Year - Inspect/Test |
| Crankshaft Vibration Damper | Inspect | 2000 hr | Every 2000 Service Hours | |
| Engine Mounts | Check | 2000 hr | Every 2000 Service Hours | |
| Generator | Other | 2000 hr | 6 mo | Every 2000 Service Hours or 6 Months - Dry |
| Generator Set Vibration | Test | 2000 hr | Every 2000 Service Hours - Test/Record | |
| Stator Lead | Check | 2000 hr | 6 mo | Every 2000 Service Hours or 6 Months |
| Turbocharger | Inspect | 2000 hr | Every 2000 Service Hours | |
| Cooling System Coolant (DEAC) | Change | 3000 hr | 36 mo | Every 3000 Service Hours or 3 Years |
| Cooling System Coolant Extender (ELC) | Other | 3000 hr | 36 mo | Every 3000 Service Hours or 3 Years - Add |
| Air Shutoff Damper | Check | 6000 hr | Every 6000 Service Hours - Remove/Check | |
| Alternator | Inspect | 6000 hr | 72 mo | Every 6000 Service Hours or 6 Years |
| Cooling System Coolant (ELC) | Change | 6000 hr | 72 mo | Every 6000 Service Hours or 6 Years |
| Cooling System Water Temperature Regulator | Replace | 6000 hr | 72 mo | Every 6000 Service Hours or 6 Years |
| Prelube Pump | Inspect | 6000 hr | 72 mo | Every 6000 Service Hours or 6 Years |
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 | Air shutoff damper plunger distance A (minimum) | 18.3 | mm | 0.72 inch; replace plunger if less |
| Clearance | Coolant level below bottom of filler pipe | 13 | mm | no sight gauge |
| 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 |
| Gap | Air shutoff damper plunger distance A (replace if less) | 18.3 | mm | |
| Other | Air cleaner element cleaning limit | six times | replace at least once per year regardless | |
| Other | Altitude capability without derate | 1525 | m | |
| Other | Altitude capability without derate | 800 | m | |
| Other | Coolant Sample (Level 1) interval for Cat DEAC | 250 | hours | |
| Other | Cooling system cleaner amount (heavy deposits) | 0.5 | L per 3.8 to 7.6 L capacity | 1 pint per 1 to 2 US gal |
| Other | Cooling system cleaner amount (normal deposits) | 0.5 | L per 15 L capacity | 1 pint per 4 US gal |
| Other | Cooling system cleaning duration (heavy deposits) | 90 | minutes | minimum, coolant at least 82 C (180 F) |
| Other | Cooling system cleaning duration (normal deposits) | 30 | minutes | minimum, coolant at least 82 C (180 F) |
| Other | Cooling system fill rate maximum | 19 | L/min | |
| Other | Damper fluid viscosity degradation limit | 20 | percent | majority of applications |
| Other | Damper fluid viscosity degradation limit (Hasse & Wrede) | 20 | percent | majority of applications |
| Other | Damper operating hours before rebuild/replace (damper without sampling port) | 20000 | hours | |
| Other | Damper without sampling port - rebuild/replace interval | 20000 | hours | or at major overhaul |
| Other | Exercise under full load | 1 | hour | ToCI quarterly |
| Other | Fast Acting Cooling System Cleaner amount | 0.5 L per 15 L | L | cooling system capacity, normal deposits |
| Other | Fast Acting Cooling System Cleaner amount | 0.5 L per 3.8 to 7.6 L | L | cooling system capacity, heavy deposits |
| Other | Full load test duration | 4 | hours | Once per year |
| 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 | Hydrosolv cleaner concentration | 2 to 5 | percent | temperatures up to 93 C (200 F) |
| Other | Load bank data recording interval | 15 | minutes | During load bank test |
| Other | Load bank test load level | 80 | % of generator nameplate capacity | 4-hour resistive load bank test |
| Other | Load bank test profile | 2 hours at 50%, 1 hour at 75%, 1 hour at 100% | Annual four (4) hour load bank test | |
| Other | Maximum air pressure at nozzle for cleaning purposes | 205 | kPa | 30 psi |
| Other | New drive belt tension recheck after operation | 30 | minutes | rated rpm |
| 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 | ||
| Other | Starting motor cool-down between cranking periods | 2 | minutes | |
| Other | Supplemental coolant additive concentration maximum (conventional coolant) | 6 | percent | |
| Other | Supplemental coolant additive concentration maximum (water and SCA) | 8 | percent | |
| Other | Thread lock cure time minimum before air shutoff use | 1 | hour | |
| Pressure | Air cleaner service indicator restriction (clean/replace) | 6 | kPa | 25 inches of H2O |
| Pressure | Engine air cleaner differential pressure (nominal) | 3 | kPa | normal engine operation |
| Pressure | Engine air cleaner maximum differential pressure (replace element) | 6.2 | kPa | |
| Pressure | Engine oil filter differential pressure (nominal) | 60 | kPa | normal engine operation |
| Pressure | Engine oil filter differential pressure (normal) | 60 | kPa | normal engine operation |
| Pressure | Engine oil filter differential pressure (replace elements) | 103 | kPa | oil filter elements to be replaced |
| Pressure | Engine oil pressure during cranking | 70 | kPa | cranking with fuel off |
| Pressure | Fuel filter differential pressure (nominal) | 60 | kPa | normal engine operation |
| Pressure | Fuel filter differential pressure (normal) | 60 | kPa | normal engine operation |
| Pressure | Fuel filter differential pressure (replace secondary elements) | 103 | kPa | fuel filter elements to be replaced |
| Pressure | Maximum air pressure at nozzle for cleaning | 205 | kPa | |
| Pressure | Maximum air pressure for cleaning (aftercooler core) | 205 | kPa | 30 psi; at nozzle |
| Pressure | Maximum air pressure for cleaning (radiator) | 205 | kPa | 30 psi; deadheaded nozzle |
| Pressure | Maximum air pressure for cleaning air cleaner element | 207 | kPa | 30 psi |
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 DEAC (Diesel Engine Antifreeze/Coolant) | Conventional coolant; SCA required; see SEBU6251 | |||
| 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 ELC (Extended Life Coolant) | Add Cat ELC Extender once; do not use conventional SCA with Cat ELC | |||
| Coolant | Cat ELC Extender | Needs to be added only once; add per cooling system capacity | |||
| Coolant | Cat NGEC | Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first | |||
| Coolant | Commercial long life / heavy-duty coolant meeting Caterpillar EC-1 | Caterpillar Engine Coolant Specification -1 (EC-1) | Obtain Level 1 coolant sample | ||
| Coolant | Commercial long life coolant meeting Caterpillar EC-1 | Caterpillar Engine Coolant Specification -1 (EC-1) | |||
| Coolant | Supplemental Coolant Additive (SCA) | Max 6 percent with conventional coolant; max 8 percent with water and SCA | |||
| 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 | air tool oil | below 0°C | Air starting motor lubricator; temperatures below 0 C (32 F) | ||
| Engine oil | low sulfated ash oil | Required for U.S. EPA Tier 4 Final, EU Stage IV engines. | |||
| Engine oil | meeting manufacturer's specs | Add crankcase oil (grade meeting manufacturer's specs) to correct level (SCI) | |||
| 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 | ||
| Engine oil | nondetergent SAE 10W | above 0°C | Air starting motor lubricator; temperatures greater than 0 C (32 F) | ||
| 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 at 60°F (16°C) | LHV 18,390 Btu/lb (42 780 kJ/kg) | Fuel at 85°F (29°C) weighing 7.001 lbs/U.S. gal (838.9 g/liter) | ||
| 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) | |||
| Grease | Cat Generator Set Grease | Part Number 108-8611 | |||
| Grease | EA6 | -40°C to 80°C | Non-regreasable bearings 311-0843/311-0844 | ||
| Grease | Mobilith SHC220 | -40°C to 80°C | 2.8 g | Roller bearings 139-0349/139-0350; every 250 service hours | |
| Grease | 2S-3230 Bearing Lubricant | -29°C to 80°C | 51.2 g | Generator bearings; 59 mL (2 oz); every 2000 service hours or 12 months | |
| Grease | UNIREX N3 | -29°C to 60°C | Do not exceed 60 °C (140 °F) above ambient; some bearings non-regreasable |
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
⚠ Slippage of loose belts can reduce efficiency of driven components
⚠ Too tight belts place unnecessary stress on components
Tools: torque wrench, shims
⚠ Check the wiring for the air shutoff switches, and for the solenoids
⚠ High voltage can cause electrocution. Discharge instrument leads and generator windings.
Tools: 300-8648 Insulation Testing Gp
⚠ 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
⚠ Do not use a high concentration of caustic cleaner
⚠ Do not use high pressure when the fins are cleaned
⚠ Batteries give off combustible gases which can explode; ensure proper ventilation.
⚠ Always recycle a battery; never discard a battery.
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.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.
The Caterpillar 3508B engine has an oil capacity of 397.0 liters.
The Caterpillar 3508B has a displacement of 34.5 liters with 8 cylinders.
The Caterpillar 3508B powers 1 generator set(s), including Caterpillar 3508.
The Caterpillar 3508B uses oil filter part numbers Caterpillar 3890434, Donaldson P551808, Wix 57792.
The Caterpillar 3508B oil change interval is every 500 hours.