GENERAL INFORMATION
The 4B12 (2.4 L) engine is an in-line four-cylinder engine. The cylinder numbers are assigned as 1-2-3-4 from the front of the engine (timing chain side). The firing order is 1-3-4-2.
| ITEMS | SPECIFICATIONS | ||
|---|---|---|---|
| Type | In-line DOHC | ||
| Number of cylinders | 4 | ||
| Bore mm (in) | 88 (3.46) | ||
| Stroke mm (in) | 97 (3.82) | ||
| Total displacement cm 3 (cu. in) | 2, 359 | ||
| Compression ratio | 10.5 | ||
| Firing order | 1-3-4-2 | ||
| Valve timing | Intake valve | Opens (BTDC) | 0° - 40° |
| Closes (ABDC) | 64° - 24° | ||
| Exhaust valve | Opens (BBDC) | 44° - 24° | |
| Closes (ATDC) | 0° - 20° | ||
| Lubrication system | Pressure feed, full-flow filtration | ||
| Oil pump type | Trochoid type | ||
GENERAL INFORMATION
OPERATION CHECK
Required Special Tool
MB992278: Belt tension release wrench
Scheme 267
- Stop the engine from the idle state.
- Remove the radiator condenser tank mounting bolt, and move the radiator condenser tank to a place where it does not interfere with the auto-tensioner check (Refer to «RADIATOR»(ref-592635-S40209669162014011000000) ).
- Check that the drive belt are not protruding from the pulley width of drive belt auto-tensioner.
- Remove the drive belt (Refer to «<< B >> DRIVE BELT REMOVAL»(ref-592642-S15094576832014011000000) ). WARNING: Always work from above when releasing the tension of the auto-tensioner. When you try to gain access from underneath the vehicle, you will experience difficulty, thus causing the tool to be dropped off. CAUTION: To work at the optimum angle, you must choose a most suitable box-type wrench is applied to the special tool. WARNING: Be sure to set the box-type wrench and the special tool MB992278 to the hexagonal parts securely to prevent the tool from falling off because the tension of the auto-tensioner is high.
- Install special tool MB992278 and a box-type wrench at the optimum angle.
- Check that no binding is present by turning the auto-tensioner in the left and right directions.
- If there are any problems in the procedure 3 or 6, replace the auto-tensioner (Refer to «TIMING CHAIN»(ref-592642-S11741338352014011000000) ).
- Install the drive belt (Refer to «>> B << DRIVE BELT INSTALLATION»(ref-592642-S12894839532014011000000) ).
- Install the radiator condenser tank to the original position (Refer to «RADIATOR»(ref-592635-S40209669162014011000000) ).