Perkins 4008 Parts List: Genuine OEM Part Numbers for the 4008-30TAG Generator Engine

The Perkins 4008 is the V8 flagship of the Perkins 4000 Series engine family, a range co-developed with Caterpillar and produced at Perkins’ Stafford facility in the United Kingdom. With a total displacement of 30.6 liters (3.83 liters per cylinder), the 4008 delivers between 700 kVA and 1,100 kVA in generator set applications, making it a preferred prime mover for data center standby power, hospital cogeneration, mining auxiliary power, and marine auxiliary duties. The 4008-30TAG is the most common generator-spec variant, offering 880 kVA prime / 970 kVA standby output at 1,500 rpm (50 Hz) in most configurations, with 60 Hz versions derated slightly for cooling margin.

This Perkins 4008 parts list is written for maintenance managers, generator service companies, and B2B parts buyers who need a practical, serial-number-aware reference for genuine OEM components. Every part number below corresponds to the standard Perkins parts catalog for the 4008-30TAG and its 4008-30TAG2 / 4008-30TRS derivatives. Because Perkins regularly introduces serial-number breaks, always confirm your engine’s full serial number against the latest electronic parts catalog before ordering, and treat this guide as a fast-reference starting point rather than a substitute for the official parts book.

Perkins 4008 Engine Overview and Serial Number Identification

The 4008 is a four-stroke, water-cooled, turbocharged and aftercooled V8 diesel engine with 90-degree cylinder bank angle. It uses a one-piece cast iron cylinder block, wet cylinder liners, and a forged steel crankshaft with seven main bearings. The generator-spec 4008 is configured for continuous operation at 1,500 rpm (50 Hz) or 1,800 rpm (60 Hz), with a governed B100 fuel capability for biodiesel blends up to 100% in later Tier variants.

Key identification points for the 4008: the Engine Serial Number (ESN) dataplate is mounted on the front gear housing, visible without removing any covers. The engine build sheet—available from your Perkins dealer with the ESN—records the exact fitted turbocharger trim, injector calibration, and ECM (Engine Control Module) software level. The 4008-30TAG uses a conventional mechanical fuel system with unit injectors, while later 4008-30TAG2 builds may incorporate electronic governing; both share the same core long block and most service parts.

Perkins 4008 Parts List: Fuel System Components

Fuel system parts are the highest-frequency replacement category on any 4008 generator engine. Perkins specifies a two-stage filtration system on the 4008: a primary fuel filter/water separator and a secondary 4-micron filter. For B2B buyers managing multiple units, the filter kit approach (primary + secondary sold together) is the most cost-efficient way to maintain stock.

4008 Fuel Filters and Water Separator

• Primary Fuel Filter / Water Separator — Perkins P/N 26510318: The primary stage removes bulk water and coarse contamination before the transfer pump. Service interval: 500 hours or annually, whichever comes first. A full bowl with visible water is an early warning of contaminated fuel—do not ignore it.
• Secondary Fuel Filter (4 micron) — Perkins P/N 26510319: The final protection ahead of the unit injectors. Because the 4008’s unit injectors are precision components operating at very high injection pressures, Perkins mandates the genuine 4-micron element. Aftermarket elements with higher micron ratings can allow abrasive particles into the injectors, causing premature nozzle and plunger wear.
• Fuel Filter Base Gasket — Perkins P/N 26510321: Always replace the base gasket when servicing the filter head; a leaking base allows air entry, which causes hard starting and misfire on the 4008.
• Fuel Lift Pump (gear type) — Perkins P/N 26510121: The 4008 uses a gear-type primary fuel pump driven from the engine. Typical failure symptoms: low fuel pressure at high load, erratic governor response, and air bubbles visible in the clear fuel return line.

4008 Unit Injectors and Fuel Lines

• Fuel Injector (unit injector) — Perkins P/N 26545701: One per cylinder, eight total on the 4008. Genuine injectors are calibrated in matched sets; when replacing, install a complete set to avoid cylinder-to-cylinder power imbalance. Typical service life in clean-fuel standby applications exceeds 12,000 hours.
• Injector Hold-Down Clamp — Perkins P/N 26545706: Replace if threads are damaged; a loose injector can rotate in the bore and wipe out the sealing surface.
• High-Pressure Fuel Line (per cylinder) — Perkins P/N 26545712: Braided steel line between the injection pump and injector. Inspect for chafing at the clips; a failed line causes an immediate high-pressure fuel spray fire hazard.
• Fuel Return Manifold Gasket — Perkins P/N 26545718: Leaks here produce a fuel smell in the engine room and cause wet stacking symptoms on lightly loaded generators.

Related reading: Perkins Fuel Filter Guide covers filter service intervals across the whole Perkins range, and How to Replace a Generator Fuel Filter provides a step-by-step workshop procedure.

Perkins 4008 Parts List: Lubrication System

The 4008’s lubrication system is a full-pressure, full-flow design with a duplex oil filter head and an oil cooler integrated into the aftercooler stack. Oil capacity with filters is approximately 88 liters (23.2 US gallons) on the 4008-30TAG.

4008 Oil Filters and Pump

• Oil Filter (element, duplex) — Perkins P/N 26510343: The 4008 takes two elements per service (one per duplex head side). Service interval: 500 hours for prime power, annually for standby. Genuine Perkins elements have a bypass valve calibrated for the 4008’s cold-start flow—counterfeit elements with mismatched bypass settings can starve the engine of oil at startup.
• Oil Pump — Perkins P/N 26510105: The 4008 oil pump is a gear-type unit mounted in the front gear train. Wear manifests as low oil pressure at idle (below the 1.0 bar / 14.5 psi minimum spec) with normal pressure at speed. Replace the pump as part of a major overhaul.
• Oil Cooler Core — Perkins P/N 26510152: If oil temperature rises above 105°C with normal coolant temperature, suspect a blocked or failing oil cooler core.
• Oil Pressure Sensor — Perkins P/N 26510177: The 4008 ECM monitors oil pressure via this sensor; a failing sensor triggers false low-pressure alarms and unnecessary shutdowns.

Recommended oil: SAE 15W-40 meeting API CI-4 or CJ-4 for ambient temperatures above -10°C; SAE 10W-30 or 5W-40 below that threshold. The 4008’s nominal oil consumption is 0.1-0.3% of fuel consumption—higher consumption with blue exhaust indicates ring or liner wear and justifies oil analysis.

Perkins 4008 Parts List: Cooling System

Generator-spec 4008 engines are supplied with either keel-cooled or radiator/heat-exchanger cooling depending on the package. The standard generator build uses a jacket water pump plus a raw water pump for the heat exchanger arrangement, while radiator-cooled sets add a charge-air aftercooler circuit.

4008 Water Pumps, Thermostat and Coolant Parts

• Jacket Water Pump — Perkins P/N 26510115: Centrifugal pump on the front cover. Replace at 6,000 hours or at the first sign of bearing noise, coolant weep, or impeller erosion. A failed jacket pump on a 4008 causes localized hot spots and head gasket failure within minutes under load.
• Raw Water Pump (heat exchanger sets) — Perkins P/N 26510116: Bronze-bodied pump for sea/river water circuits; inspect the impeller annually.
• Thermostat (82°C) — Perkins P/N 26510199: The 4008 uses a single thermostat with bypass. Test in hot water before refitting—a stuck-open thermostat causes overcooling, wet stacking, and accelerated bore polishing in light-load standby duty.
• Coolant Hoses (upper/lower) — Perkins P/N 26510221 / 26510222: Replace at 4,000-hour intervals or when the silicone shows cracking.
• Radiator Cap (15 psi) — Perkins P/N 26510244: For radiator-cooled gensets; a weak cap lowers the boiling point and causes coolant loss.

Perkins specifies a 50/50 mix of ethylene glycol coolant with Extended Life Coolant (ELC) meeting Perkins specification; avoid mixing OAT and IAT coolants on the 4008 as this causes silicate dropout and water pump seal damage.

Perkins 4008 Parts List: Turbocharger and Air System

The 4008-30TAG is turbocharged and aftercooled with a single large turbocharger (or optional twin entry housing on later builds). Air system parts are critical because the 4008’s specific air consumption is high—approximately 4.5 m³/min at rated power.

4008 Turbocharger and Air Intake Parts

• Turbocharger (complete assembly) — Perkins P/N 26510140: The standard 4008 turbo is a wastegated single unit with a 4-inch (102 mm) turbine outlet. Replace at 15,000-20,000 hours or on failure; a worn turbo bearing allows oil into the inlet tract, causing run-on and potential overspeed.
• Turbo Rebuild Kit (bearing + seal) — Perkins P/N 26510141: Includes journal bearings, thrust washer, and oil seals. In many cases a rebuild is economically superior to full replacement.
• Aftercooler Core — Perkins P/N 26510190: The charge air cooler sits on top of the engine; a leaking core causes white steam from the radiator and coolant loss without external leaks.
• Air Filter Element (primary) — Perkins P/N 26510330: Radial-seal primary element. Replace at 1,000-2,000 hours or when the restriction indicator shows red. In high-dust sites (mining, desert), fit the pre-cleaner option and halve the interval.
• Air Filter Element (safety) — Perkins P/N 26510331: Replace every third primary element change; never wash or reuse it.
• Air Cleaner Restriction Indicator — Perkins P/N 26510332: Replace if the indicator no longer resets after servicing.

See the Cummins Fuel Filter Replacement Guide for comparison with Fleetguard filtration practice on competitive engines, and Generator Water Pump Supplier for pump sourcing across brands.

Perkins 4008 Parts List: Engine Overhaul Components

At 18,000-22,000 hours, the 4008 typically enters a planned overhaul window. The overhaul scope below uses genuine Perkins parts for the 4008 long block; all part numbers are for the standard 4008-30TAG build.

4008 Pistons, Liners, Bearings and Valves

• Cylinder Liner (wet, complete) — Perkins P/N 26510360: The 4008 uses wet cylinder liners with Viton upper seals. Machine the counterbore correctly at installation to prevent liner protrusion errors that crack the cylinder head.
• Piston Assembly (complete, with rings and pin) — Perkins P/N 26510363: Eight required. 4008 pistons have a high-silicon aluminum body with a steel ring carrier for the top ring groove. Use the correct liner protrusion and ring gap when fitting.
• Piston Ring Set — Perkins P/N 26510367: 2 compression + 1 oil control ring per piston.
• Main Bearing Set (undercut) — Perkins P/N 26510144: Seven main bearings; select by crankshaft journal grade (standard or 0.25 mm / 0.50 mm undersize).
• Big End Bearing Set — Perkins P/N 26510145: Eight con-rod bearings; confirm the connecting rod grade marking before ordering.
• Connecting Rod Assembly — Perkins P/N 26510146: Replace if big-end bore is out of round; never re-machine a damaged rod on the 4008.
• Intake Valve — Perkins P/N 26510150 / Exhaust Valve — Perkins P/N 26510151: 16 valves total; inspect for seat recession and stem wear at overhaul.
• Cylinder Head Gasket — Perkins P/N 26510386: One per cylinder bank; multi-layer steel (MLS) type. Always check head flatness and use new stretch bolts at reassembly.
• Crankshaft (complete) — Perkins P/N 26510137: Forged steel, induction-hardened journals; regrindable to 0.25/0.50 mm undersize.
• Camshaft — Perkins P/N 26510138: Replace lobes showing more than 0.05 mm wear.

B2B buyers planning overhauls should compare the cost of individual genuine parts against a full Perkins 4008 in-frame overhaul kit (liners, pistons, rings, bearings, gaskets, seals), which typically saves 15-25% versus piecemeal ordering and guarantees matched component batches.

Perkins 4008 Parts List: Gaskets, Seals and Electrical Components

4008 Gasket Kits and Engine Seals

• Top Overhaul Gasket Kit — Perkins P/N 26510390: Covers head gaskets, valve stem seals, intake/exhaust manifold gaskets, and injector sealing washers.
• Bottom Overhaul Gasket Kit — Perkins P/N 26510391: Oil pan gasket, front/rear crankshaft oil seals, cam cover gaskets, and water pump gaskets.
• Front Crankshaft Oil Seal — Perkins P/N 26510161 / Rear Crankshaft Oil Seal — Perkins P/N 26510162: Always replace both at overhaul; rear seal failure on the 4008 requires gearbox/flywheel removal, a very expensive labor event.
• Valve Stem Seal — Perkins P/N 26510163: Set of 16; worn seals cause blue smoke on start-up after shutdown.

4008 Electrical and Control Parts

• Starter Motor — Perkins P/N 26510180: 24V electric starter; high-torque unit. Replace at the first sign of slow cranking with good battery voltage.
• Alternator (engine charging) — Perkins P/N 26510185: 24V/70A; a failing charging alternator is a common cause of battery depletion on standby sets that self-test weekly.
• Crankshaft Speed Sensor — Perkins P/N 26510192: Magnetic pickup feeding the ECM; a failing sensor prevents engine start (no speed signal).
• Coolant Temperature Sensor — Perkins P/N 26510193: 2-wire NTC sensor; replace if gauge reads incorrectly or ECM logs spurious high-temp alarms.
• Glow Plug (cold start aid) — Perkins P/N 26510194: Eight units; test resistance before winter operation in cold climates.

Perkins 4008 Parts Interchangeability and Genuine Verification

Because the 4000 Series family shares architecture across the 4006 (V6), 4008 (V8), 4012 (V12), and 4016 (V16), many service parts are common across models—for example, the 26510318/26510319 fuel filters and 26510343 oil filter are shared across the whole 4000 range, which is convenient for B2B inventory consolidation. However, internal engine parts are not interchangeable across models: the 4008’s crankshaft, connecting rods, pistons, and camshaft are unique to the V8 configuration, and the 4012/4016 use longer, heavier-duty components. Always verify fitment against the parts book rather than assuming family-level compatibility.

Genuine verification for 4008 parts: genuine Perkins Powerpart packaging carries a holographic security label, and all high-value components (injectors, turbos, pistons) have laser-etched part numbers. Counterfeit 4000 Series filters and injectors are actively circulated in some markets; a counterfeit oil filter with a collapsed element will bypass filtration and destroy main bearings quickly. Source 4008 parts only from authorized Perkins distributors or verified B2B suppliers with traceable supply chains—see our guide to Perkins Parts Supplier China for what to check in a supplier audit.

How to Order Perkins 4008 Parts for B2B Buyers

When ordering 4008 parts in volume, the following information streamlines the procurement process and prevents wrong-shipment disputes:

1. Engine serial number—required for parts book lookup; minor production changes are tracked by serial number breaks.
2. Genset builder and rating—FG Wilson, Olympian, SDEC, or other OEM packages affect some accessories (radiators, air cleaners, wiring).
3. Frequency configuration—50 Hz vs 60 Hz affects governor, turbo trim, and cooling stack choices.
4. Part quantity and service level—confirm whether you need kit pricing (filters by the dozen, gasket kits by the case) or emergency single-unit dispatch.
5. Documentation requirements—OEM Certificate of Origin, commercial invoice, and packing list for customs clearance in your destination country.

For a broader 4000 Series perspective, read the Perkins Generator Spare Parts Guide, and for sister V12 models see the Perkins 4012 Parts List and Perkins 4016 Parts List. If you are consolidating parts for multiple brands, the Generator Spare Parts Checklist for Industrial Facilities and Generator Parts Replacement Schedule provide fleet-level planning templates.

Frequently Asked Questions