Engine Mechanical (QR25DE): Adjustments Suzuki Equator I

Drive Belts: Adjustment

There is no manual drive belt tension adjustment. The drive belt tension is automatically adjusted by the drive belt auto tensioner.

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1. Install Tool on auto tensioner pulley bolt and move in the direction of arrow (loosening direction of tensioner). Tool number: - (J-46535) WARNING: Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes off. CAUTION: Do not loosen the auto-tensioner pulley bolt. (Do not turn it counterclockwise.) If turned counterclockwise, the complete auto-tensioner must be replaced as a unit, including pulley.
2. Remove drive belt.

ADJUSTMENT

1. Perform adjustment depending on selected head thickness of valve lifter.

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1. Measure the valve clearance.
2. Remove camshaft. Refer to [ «CAMSHAFT: REMOVAL AND INSTALLATION»(ref-375720-S31651552502010102800000) ].
3. Remove valve lifters at the locations that are out of the standard.
4. Measure the center thickness of the removed valve lifters with a micrometer.
5. Use the equation below to calculate valve lifter thickness for replacement. Valve lifter thickness calculation: t = t 1 + (C 1 -C 2 ) t = Valve lifter thickness to be replaced t 1 = Removed valve lifter thickness C 1 = Measured valve clearance C 2 = Standard valve clearance: Intake: 0.28 mm (0.011 in) Exhaust: 0.30 mm (0.012 in) Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark "696" indicates 6.96 mm (0.2740 in) in thickness. NOTE: Available thickness of valve lifter: 26 sizes range 6.96 to 7.46 mm (0.2740 to 0.2937 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to [ «SERVICE DATA AND SPECIFICATIONS»(ref-375720-S23327977742010102800000) ].
6. Install the selected valve lifter.
7. Install camshaft. Refer to [ «CAMSHAFT: REMOVAL AND INSTALLATION»(ref-375720-S31651552502010102800000) ].
8. Manually rotate crankshaft pulley a few rotations.
9. Make sure that the valve clearances for cold engine are within specifications by referring to the specified values.
10. Installation of the remaining components is in the reverse order of removal.
11. Start the engine, and check for unusual noise and vibration.

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1. Warm up engine thoroughly.
2. Release fuel pressure. Refer to [ «FUEL PRESSURE CHECK: QR25DE»(ref-375719-S33684214322010102800000) ]
3. Disconnect fuel pump fuse to avoid fuel injection during measurement.
4. Remove spark plug from each cylinder. Refer to [ «SPARK PLUG: REMOVAL AND INSTALLATION»(ref-375723-S33049837312010102800000) ]
5. Connect engine tachometer (not required in use of SDT).
6. Install compression tester with an adapter into spark plug hole. Use the adapter whose pick up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it may be caught by cylinder head during removal.
7. With accelerator pedal fully depressed, turn ignition switch to "START" for cranking. When the gauge pointer stabilizes, read the compression pressure and the engine RPM. Perform these steps to check each cylinder. Compression pressure: COMPRESSION PRESSURE SPECIFICATIONS Unit: kPa (kg/cm 2 , psi) /rpm Standard Minimum Differential limit between cylinders 1,304 (13.3, 189) / 250 1,108 (11.3, 161) / 250 100 (1.0, 14) / 250 CAUTION: Always use fully a charged battery to obtain the specified engine speed. If the engine speed is out of the specified range, check battery liquid for proper gravity. Check engine speed again with normal battery gravity. If compression pressure is below minimum value, check valve clearances and parts associated with combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket). After the checking, measure the compression pressure again. If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression. If the added engine oil improves the compression, piston rings may be worn out or damaged. Check piston rings and replace if necessary. If the compression pressure remains at low level despite the addition of engine oil, valves may be malfunctioning. Check valves for damage. Replace valve or valve seat accordingly. If two adjacent cylinders have respectively low compression pressure and their compression remains low even after the addition of engine oil, cylinder head gasket is leaking. In such a case, replace cylinder head gasket.
8. After inspection is completed, install removed parts.
9. Start engine, and make sure that engine runs smoothly.
10. Perform trouble diagnosis. If DTC appears, erase it.

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