The Perkins 1004G is a 3.99 L 4-cylinder naturally aspirated engine rated at 1500 rpm, producing up to 47.5 kW. It powers generator sets from Atlas Copco, FG Wilson, Olympian and Perkins, including the QAS48, P40P1, P44E1 and P45P1. It holds 8.1 L (2.1 gal) of oil and 15.7 L (4.1 gal) of coolant.
Also known as: Perkins 1004G
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 | 8.1 L |
|---|---|
| Coolant capacity | 15.7 L |
| Displacement | 3.99 L |
| Cylinders | 4 |
| Aspiration | Naturally aspirated |
| Rated speed | 1500 rpm |
| Gross power | 47 kW |
Shared across brands: Atlas Copco, FG Wilson, Olympian, Perkins
Compiled from service & troubleshooting documentation across every generator set that uses the Perkins 1004G.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Fuel filter | T64102003 | Amazon eBay $33.55 PartsGeek $15.97 KuduParts $22.00 | |||
| Oil filter | T74105021 | Amazon eBay $19.00 NAPA $20.60 | |||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
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 |
|---|---|---|---|---|
| oil and filter | Change | 450 hr | 1300 Series EDi - oil and filter changes at 450 hours reduce down time | |
| service interval | Other | 500 hr | 1100C range - 500 hour service intervals |
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 |
|---|---|---|---|---|---|
| Engine oil | API CH4/ACEA E5 | 1100 Series (1103C/1104C) | |||
| Engine oil | 15W40 | ACEA E3 or API CG4 | 1300 Series EDi | ||
| Engine oil | multi-grade oil | API-CH4/CI4 | 1106D-E66TAG | ||
| Engine oil | single or multigrade oil | ACEA E1 E2 or CD/SD | 1000 Series | ||
| Fuel | BS 2869 Part 2 1998 Class A2 or ASTM D975 D2 | 1000/1300 Series |
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 Perkins 1004G engine has an oil capacity of 8.1 liters.
The Perkins 1004G has a displacement of 3.99 liters with 4 cylinders.
The Perkins 1004G powers 7 generator set(s), including Atlas Copco QAS48, FG Wilson P40P1, FG Wilson P44E1, FG Wilson P45P1, FG Wilson P50E1.
The Perkins 1004G uses oil filter part numbers Perkins T74105021, Donaldson P554403, Wix 51806.
The Perkins 1004G uses fuel filter part numbers Perkins T64102003, Donaldson P550588, Wix 33472.
A commonly reported issue on generators using the Perkins 1004G is: The engine does not start or is difficult to start. Cause: Starter motor turns engine too slowly.