Oil Pressure Test
Oil Pressure Test1. Disconnect and remove the oil pressure sensor from the engine.
2. Connect Engine Oil Pressure Gauge and Transmission Test Adapter SST 49 0187 280 or equivalent to the oil pressure switch oil galley port.
3. Run the engine until normal operating temperature is reached.
4. Run the engine at 3,000 rpm and record the gauge reading.
5. The oil pressure should be within specifications 276-414 kPa (40-60 psi) (hot @ 2,000 rpm).
6. If the pressure is not within specification, check the following possible sources:
- Insufficient oil
- Oil leakage
- Worn or damaged oil pump
- Oil pump screen cover and tube
- Excessive main bearing clearance
- Excessive connecting rod bearing clearance
Valve Train Analysis - Engine Off
Static checks (engine off) are to be made on the engine prior to the dynamic analysis.
Valve Train Analysis - Engine Off, Valve Cover Removed
NOTE: For the removal and installation of the valve cover.
Check for damaged and/or severely worn parts and correct assembly. Make sure correct parts are used with the static valve train analysis.
Valve Train Analysis - Engine Off, Valve Tappets
Inspect the valve tappets for:
- Excessive tappet gap
- Sticking tappet bucket
Replace valve tappets as necessary. See appropriate Mazda B-Series Engine Workshop Manual.
Valve Train Analysis - Engine Off, Camshaft - Overhead Camshaft Engines
Inspect the camshaft for:
- Scoring
- Scratches
- Excess wear on the camshaft lobes
Replace the camshaft if necessary. See appropriate Mazda B-Series Engine Workshop Manual.
Valve Train Analysis - Engine Off, Valve Springs
1. Check for broken or damaged valve springs.
2. Check valve spring strength. See appropriate Mazda B-Series Engine Workshop Manual. Replace as necessary.
Valve Train Analysis - Engine Off, Valve Spring Retainer and Valve Spring Retainer Keys
Check for proper seating of valve spring retainer keys on the valve stem and in the valve spring retainer.
Valve Train Analysis - Engine Off, Valves and Cylinder Head
1. Check for plugged oil drain back holes.
2. Check for worn or damaged valve tips.
3. Check for missing or damaged valve stem seals.
4. Check for excessive valve tappet gap.
5. Check installed valve spring length. See appropriate Mazda B-Series Engine Workshop Manual.
Replace components as necessary.
Valve Train Analysis - Engine Running
NOTE:
- Static checks (engine off) are to be made on the engine prior to the dynamic analysis.
Prior to performing any dynamic checks, make sure the transmission is in P (Park) (A/T) or N (Neutral) (M/T) and the parking brake is fully engaged.
Start and idle the engine. Check for proper operation of all parts.
1. Check for plugged oil gallery in the rocker arms or cylinder head.
2. Check for proper valve train lubrication.
Valve Train Analysis - Engine Running, Rocker Arm
1. Check for plugged oil in the rocker arms or cylinder head.
2. Check for proper overhead valve train lubrication.
If insufficient oiling is suspected, accelerate the engine to 1,200 rpm ± 100 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil hole such that valve tips and rocker arms are well oiled and/or, with the valve covers off, oil splash may overshoot the rocker arms. If oiling is insufficient for this to occur, check the oil passages for blockage.
Camshaft Lobe Lift
Inspect the camshaft lobe lift. Replace the camshaft if the lobe lift is not within specification. See appropriate Mazda B-Series Engine Workshop Manual.
Camshaft Lobe Lift - Valve Tappet, 2.3L, and 4.0L Engines
Valve tappet noise may be caused by any of the following:
- Excessive valve tappet gap
- Sticking valve tappet bucket
- Air in lubrication system
Excessive valve tappet gap may be caused by excessive wear on valve tappet face or shim. Check gap between valve shim and camshaft to determine if any other valve tappet parts are damaged, worn or out of adjustment. Valve clearances are adjustable on the 2.3L engine. See VALVE CLEARANCE INSPECTION / ADJUSTMENT - 2.3L.
Air bubbles in the lubrication system will prevent the valve tappet from supporting the valve spring load. This may be caused by incorrect oil level or by air being drawn into the system through a hole, crack or leaking gasket on the oil pump screen cover and tube.
Timing Chain - 2.3L, and 4.0L Engines
See TIMING CHAIN REMOVAL/INSTALLATION-2.3L, for the removal and installation of the timing chain and sprockets.
Make sure the timing marks on the crankshaft sprocket and the camshaft sprocket are positioned across from each other as shown in the illustration.
Timing Chain Deflection - 2.3L, and 4.0L Engines
1. Remove the engine front cover.
2. Rotate the crankshaft so the camshaft sprocket and crankshaft sprocket timing marks line up.
3. Mark the top link(s) of the timing chain.
4. Have an assistant hold the crankshaft sprocket with a suitable tool so it cannot turn.
5. Place a machinist's scale above the timing chain (camshaft sprocket) to measure its movement.
6. Put a torque wrench and socket on the camshaft sprocket bolt.
7. Apply a maximum of 20 N.m {2 kgf.m, 15 ft.lbf} torque in a clockwise direction.
8. Note the location of the marked link on the scale.
9. Apply a maximum of 20 N.m {2 kgf.m, 15 ft.lbf} torque in a counterclockwise direction while measuring the amount the marked link moves.
10. If movement is excessive, replace the timing chain.