Engine Mechanical - General - Engine Overhaul: Other Mazda Tribute I рестайлинг

Belt Tensioner - Mechanical

The only mechanical check that needs to be made is a check for tensioner stick, grab or bind.

1. With the engine not running, check routing of the belt.
2. Detach the belt in the area of the tensioner.
3. Using the correct tool, move the tensioner from its relaxed position, through its full stroke and back to the relaxed position to make sure there is no stick, grab or bind, and to make sure that there is tension on the tensioner spring.
4. Rotate the tensioner pulley and check for a binding, contaminated or seized condition. Install a new tensioner if necessary. See «ACCESSORY DRIVE BELT TENSIONER -- 2.3L»(ref-221816-S11035451662006022600000) or «ACCESSORY DRIVE BELT TENSIONER -- 3.0L (4V)»(ref-221817-S11352490302006022600000) .
5. Inspect the area surrounding the tensioner for oil leaks or contamination. Repair any leaks before installing a new tensioner. If the tensioner is contaminated, do not attempt to clean it as the damping mechanism inside may be damaged. Install a new tensioner if necessary. See «ACCESSORY DRIVE BELT TENSIONER -- 2.3L»(ref-221816-S11035451662006022600000) or «ACCESSORY DRIVE BELT TENSIONER -- 3.0L (4V)»(ref-221817-S11352490302006022600000) .
6. If the tensioner meets the above criteria, proceed to test the tensioner dynamically. If the tensioner does not meet the above criteria, install a new tensioner. See «ACCESSORY DRIVE BELT TENSIONER -- 2.3L»(ref-221816-S11035451662006022600000) or «ACCESSORY DRIVE BELT TENSIONER -- 3.0L (4V)»(ref-221817-S11352490302006022600000) ..

Belt Tensioner - Dynamic

The automatic belt tensioner can be checked dynamically as follows

1. With the engine running, observe the belt tensioner movement. The tensioner should move (respond) when the air conditioning clutch cycles (if equipped), or when the engine is accelerated rapidly. If the tensioner movement is excessive without air conditioning clutch cycling or engine acceleration, a pulley or shaft is possibly bent, or out of round or the damper mechanism inside the tensioner may be damaged. Excessive belt rideout (uneven depth of grooves in the belt) can cause excessive tensioner movement. Check condition by installing a new belt. See «ACCESSORY DRIVE BELT -- 2.3L»(ref-221816-S41124517472006022600000) or «ACCESSORY DRIVE BELT -- 3.0L (4V)»(ref-221817-S07836805682006022600000) .

Scheme 138

1. Measure the free length of each valve spring. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If out of specification, install new components as necessary.

Scheme 139

1. Use a Valve/Clutch Spring Pressure Gauge to check the valve spring for correct strength at the specified valve spring length. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If out of specification, install new components as necessary.

Scheme 140

1. Measure the out-of-square on each valve spring. Turn the valve spring and observe the space between the top of the valve spring and the square. Install a new valve spring if out of square.

Scheme 141

1. Inspect the following valve areas: the end of the stem for grooves or scoring the valve face and the edge for pits, grooves or scores the valve head for signs of burning, erosion, warpage and cracking. the valve head thickness for wear

Scheme 142

1. Measure the diameter of each intake and exhaust valve stem at the points shown. Verify the diameter is within specification. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If out of specification, install new components as necessary.

Scheme 143

1. Measure the inner diameter of the valve guides in two directions where indicated. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) .
2. If the valve guide is not within specifications, install a new cylinder head assembly.

Valve and Seat Refacing Measurements

Scheme 144

1. Check the valve head and seat. Check valve angles. Check margin width. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . Be sure margin width is within specification.
2. Inspect for abnormalities on the valve face and seat. Install a new cylinder head assembly if abnormalities are found.

Scheme 145

1. Use the Valve Seat Runout Gauge to check valve seat runout. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) .

Scheme 146

1. Measure the installed length of each valve spring. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If out of specification, install new components.

Scheme 147

1. Remove the valve cover. See «VALVE COVER»(ref-221816-S30441511922006022600000) for the 2.3L engine, or «VALVE COVER -- RH»(ref-221817-S20945219832006022600000) for the 3.0L (4V) engine. CAUTION: Turn the engine clockwise only, and only use the crankshaft bolt. NOTE: Before removing the camshafts, measure the clearance of each valve at base circle, with the lobe pointed away from the tappet. Failure to measure all clearances prior to removing the camshafts will necessitate repeated removal and installation and wasted labor time.
2. Use a feeler gauge to measure the clearance of each valve and record its location. NOTE: The number on the valve tappet only reflects the digits that follow the decimal. For example, a tappet with the number 0.650 has the thickness of 3.650 mm. NOTE: A midrange clearance is the most desirable: Intake: 0.22-0.28 mm (0.008-0.011 inch) Exhaust: 0.27-0.33 mm (0.010-0.013 inch)
3. Select tappets using this formula: tappet thickness = measured clearance + the base tappet thickness - most desirable thickness. Select the tappets and mark the installation location.
4. If any tappets do not measure within specifications, install new tappets in these locations. See «VALVE SEALS AND VALVE TAPPETS»(ref-221816-S05684361632006022600000) for the 2.3L engine.

Scheme 148

1. Inspect camshaft lobes for pitting or damage in the contact area. Minor pitting is acceptable outside the contact area. If excessive pitting or damage is present, install new components as necessary. See «CAMSHAFTS»(ref-221816-S04636661912006022600000) for 2.3L, and «CAMSHAFTS -- LH»(ref-221817-S11550761802006022600000) or «CAMSHAFTS -- RH»(ref-221817-S27570751032006022600000) for 3.0L .

Scheme 149

1. Use a Dial Indicator Gauge with Holding Fixture to measure camshaft intake/exhaust lobe lift. Rotate the camshaft and subtract the lowest indicator reading from the highest indicator reading to figure the camshaft lobe lift. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) .

Scheme 150

1. Measure each camshaft journal diameter in two directions. If out of specification, install new components as necessary. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) .

CAMSHAFT - RUNOUT

Note. Camshaft journals must be within specifications before checking runout.

Scheme 151

1. Use a Dial Indicator Gauge with Holding Fixture to measure the camshaft runout. Rotate the camshaft and subtract the lowest indicator reading from the highest indicator reading. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If out of specification, install new components as necessary.

CAMSHAFT JOURNAL - CLEARANCE, PLASTIGAGE METHOD

Note. The camshaft journals must meet specifications before checking camshaft journal clearance.

Scheme 152

1. Remove the camshaft bearing cap and lay Plastigage(R) across the surface. NOTE: Do not turn the camshaft while carrying out this procedure.
2. Position the camshaft bearing cap and install the bolts.
3. Use Plastigage to verify the camshaft journal clearance. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If it is out of specification, install new components as necessary.

Scheme 153

1. Use a Dial Indicator Gauge with Holding Fixture to measure camshaft end play.
2. Position the camshaft to the rear of the cylinder head.
3. Zero the indicator.
4. Move the camshaft to the front of the cylinder head. Note and record the camshaft end play. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If camshaft end play exceeds specifications, install new camshaft and recheck end play. See «CAMSHAFTS»(ref-221816-S04636661912006022600000) for 2.3L, and «CAMSHAFTS -- LH»(ref-221817-S11550761802006022600000) or «CAMSHAFTS -- RH»(ref-221817-S27570751032006022600000) for 3.0L . If camshaft end play exceeds specification after camshaft installation, install a new cylinder head. See «CYLINDER HEAD»(ref-221816-S18655295452006022600000) for 2.3L, and «CYLINDER HEAD -- LH»(ref-221817-S18987911452006022600000) or «CYLINDER HEAD -- RH»(ref-221817-S06258133792006022600000) for 3.0L.

Scheme 154

1. Measure the crankshaft end play. Use a Dial Indicator Gauge with Holding Fixture to measure crankshaft end play.
2. Position the crankshaft to the rear of the cylinder block.
3. Zero the indicator.
4. Move the crankshaft to the front of the cylinder block. Note and record the crankshaft end play. See «SPECIFICATIONS»(ref-221843-S16789763792006022600000) . If crankshaft end play exceeds specifications, install a new crankshaft thrust washer or crankshaft thrust main bearing.