Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE
Section 10 (Engine Mechanical System (2.4L)): General Description: Specification: Engine
WARNING: This page is about a different variant/trim than selected.
| Model | 2.4 L | ||||
| Cylinder arrangement | Horizontally opposed, liquid cooled, 4-cylinder 4-stroke gasoline engine | ||||
| Valve system mechanism | Chain driven, double overhead camshaft, 4-valve/cylinder | ||||
| Bore x Stroke | mm (in) | 94.0 x 86.0 (3.70 x 3.39) | |||
| Displacement | cm3 (cu in) | 2, 387 (146) | |||
| Compression ratio | 10.6 | ||||
| Compression pressure (at 200 - 300 r/min) | kPa (kg/cm2 , psi) | Standard | 1, 350 - 1, 750 (14 - 18, 196 - 254) | ||
| Number of piston rings | Compression ring: 2 Oil ring: 1 | ||||
| Intake valve timing | Open | Max.retard | ATDC 36° | ||
| Min.advance | BTDC 42° | ||||
| Close | Max.retard | ABDC 92° | |||
| Min.advance | ABDC 14° | ||||
| Exhaust valve timing | Open | Max.retard | BBDC 11° | ||
| Min.advance | BBDC 66° | ||||
| Close | Max.retard | ATDC 55° | |||
| Min.advance | ATDC 0° | ||||
| Cam clearance | mm (in) | Intake | Standard | 0.13+0.02
-0.03 (0.0051+0.0008 -0.0012) |
|
| Exhaust | Standard | 0.22 ±0.02 (0.0087±0.0008) | |||
| Idle rpm (select lever in "P" or "N" range) | r/min | No load | Standard | 700±100 | |
| A/C ON | Standard | 800 - 885±100 | |||
| Ignition order | 1 → 3 → 2 → 4 | ||||
| Ignition timing | BTDC/{r/min} | Standard | 0°±10°/700 | ||
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
