ALTROZ SERVICE MANUAL

1.2L REVOTRON ENGINE 13 'Squeal' or 'chirping' while engine is running. Worn, oil-fouled, or improperly adjusted engine accessory belt.  Check engine accessory belt condition and tension. Adjust or replace. Belt tensioner not properly tightened or defective  Inspect the belt tensioners. Tighten or replace as necessary. 'Clunking' or 'rapping' noise from bottom end of engine Defective piston wrist pin, rod, or main bearings  If noise occurs after taking foot off accelerator pedal, inspect piston wrist pins.  If noise is constant inspect rod bearings and main bearings for proper clearance and condition  Replace bearings as necessary. 'Tapping' or 'ticking' noise from the top end of the engine Fuel injectors worn excessively  Fuel injectors will make some ticking noise. Replace fuel injectors if not putting out enough fuel to cylinders. Excessively worn camshaft  Inspect camshaft. lobes and runout for excessive wear. Replace as necessary. Valve springs, tappets, or rocker arms worn  Inspect valve train components; replace as necessary. 5. Exhaust System Condition Possible Cause Remedy Engine emits white smoke from tailpipe. Obstructed air filter or air Inlet  Clean or replace air filter or Inlet. Head gasket leaking coolant into combustion chamber  Inspect engine oil for coolant and perform engine compression test. Engine cylinder head or block cracked  Inspect engine oil for coolant and perform engine compression test. Engine oil or other substance on exhaust manifold  Inspect exhaust manifold for foreign material. Improper grade or contaminated fuel  Rush fuel system with fresh, clean, fuel of the correct type. Replace fuel filter. Mix of oil and water in oil cooler  Check for oil and water mix up in oil cooler. Flush and clean. Engine emits blue smoke from tailpipe. Worn or damaged valve guide seals  Remove rocker arm cover and inspect valve guide seals. Replace as necessary. Engine crankcase overfilled with oil  Check oil level; drain oil as necessary.