Maintenance schedule
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil | genuine oil and filters recommended by Rehlko | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
The Kohler KDI 2504M is a 3.18 L 4-cylinder natural engine rated at 1800 rpm, producing up to 41 kW. It powers generator sets from Kohler, including the 20REOZK, K25 and KDI 2504 M. It holds 11.5 L (3.0 gal) of oil and 11.4 L (3.0 gal) of coolant.
Also known as: Kohler KDI 2504M
Part of the Kohler KDI2504 engine family — 15 variants share parts & fitment.
| Oil capacity | 11.5 L |
|---|---|
| Coolant capacity | 11.4 L |
| Displacement | 3.178 L |
| Cylinders | 4 |
| Aspiration | Natural |
| Rated speed | 1800 rpm |
| Gross power | 41 kW |
Compiled from service & troubleshooting documentation across every generator set that uses the Kohler KDI 2504M.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil | genuine oil and filters recommended by Rehlko | — |
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 | Change | 500 hr | Minimum 500 hours oil change interval |
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 |
|---|---|---|---|---|
| Other | 10 in. weld flange bolt circle diameter B | 361.95 | mm (14.25 in.) | |
| Other | 10 in. weld flange outside diameter C | 406.4 | mm (16.0 in.) | |
| Other | 10 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 12 in. weld flange bolt circle diameter B | 431.80 | mm (17.00 in.) | |
| Other | 12 in. weld flange outside diameter C | 482.6 | mm (19.0 in.) | |
| Other | 12 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 14 in. weld flange bolt circle diameter B | 476.25 | mm (18.75 in.) | |
| Other | 14 in. weld flange outside diameter C | 533.4 | mm (21.0 in.) | |
| Other | 14 in. weld flange quantity of bolts / bolt hole diameter D | 12, 28.58 | mm (1.13 in.) | |
| Other | 16 in. weld flange bolt circle diameter B | 539.75 | mm (21.25 in.) | |
| Other | 16 in. weld flange outside diameter C | 596.9 | mm (23.5 in.) | |
| Other | 16 in. weld flange quantity of bolts / bolt hole diameter D | 16, 28.58 | mm (1.13 in.) | |
| Other | 18 in. weld flange bolt circle diameter B | 577.85 | mm (22.75 in.) | |
| Other | 18 in. weld flange outside diameter C | 635.0 | mm (25.0 in.) | |
| Other | 18 in. weld flange quantity of bolts / bolt hole diameter D | 16, 31.75 | mm (1.25 in.) | |
| Other | 20 in. weld flange bolt circle diameter B | 635.00 | mm (25.00 in.) | |
| Other | 20 in. weld flange outside diameter C | 698.5 | mm (27.5 in.) | |
| Other | 20 in. weld flange quantity of bolts / bolt hole diameter D | 20, 31.75 | mm (1.25 in.) | |
| Other | 5 in. weld flange bolt circle diameter B | 215.90 | mm (8.50 in.) | |
| Other | 5 in. weld flange outside diameter C | 241.30 | mm (9.50 in.) | |
| Other | 5 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 6 in. weld flange bolt circle diameter B | 254.0 | mm (10.0 in.) | |
| Other | 6 in. weld flange outside diameter C | 279.4 | mm (11.0 in.) | |
| Other | 6 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 8 in. weld flange bolt circle diameter B | 298.45 | mm (11.75 in.) | |
| Other | 8 in. weld flange outside diameter C | 342.9 | mm (13.5 in.) | |
| Other | 8 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | Weld flange angle A (10, 12, 14 in. nominal pipe size) | 30 | deg. | |
| Other | Weld flange angle A (16, 18, 20 in. nominal pipe size) | 22.5 | deg. | |
| Other | Weld flange angle A (5, 6, 8 in. nominal pipe size) | 45 | deg. |
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 |
|---|---|---|---|---|---|
| Fuel | No 1 Diesel (US) - ASTM D 975-09 B - Grade 1-D S 15 and No 2 Diesel (US) - ASTM D 975-09 B - Grade 2-D S 15, S 500 for mechanical models only | ASTM D 975-09 B |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| A-226955 | Air cleaner assembly | Air filter |
| GM16944 | Element, air cleaner | Air filter |
| GM66601 | Element, Inner | Air filter |
| 8972824032 | Acid charge Pb-Ca maintenance free, 12V - 1100 CCA | Battery |
| 8972824033 | Acid charge Pb-Ca maintenance free, 12V - 1100 CCA | Battery |
| ED0082051350-S | COV.HEAD GASK.-OR SET 2504 TCR | Gasket |
| ED0082051370-S | COV.HEAD GASK.-OR SET 2504 M | Gasket |
| GM22310 | Hose, Reducer | Hose |
| GM86224 | Hose, Air Intake (Item 5) | Hose |
| GM92268 | Bracket, air cleaner Mtg. | Mounting |
| GM95611 | Bracket, Air Cleaner Mtg. | Mounting |
| ED0053029490 | 2.5 Blue smoke | Service part / kit |
| M125A-08-80 | Washer, Plain 8.4 ID x 16.0 OD | Service part / kit |
| 273377 | Gauge, restriction | Sensor |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
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 Kohler KDI 2504M engine has an oil capacity of 11.5 liters.
The Kohler KDI 2504M has a displacement of 3.178 liters with 4 cylinders.
The Kohler KDI 2504M powers 3 generator set(s), including Kohler 20REOZK, Kohler K25, Kohler KDI 2504 M.
A commonly reported issue on generators using the Kohler KDI 2504M is: The engine does not start. Cause: Sulphated battery terminals corroded. Fix: Clean the battery terminals.