Genuine Mazda Protege Cylinder Head

Mazda Protege Cylinder Head Parts and Q&A

• Cylinder Head
  ZL01-10-100G
  Q: What steps should be taken for thorough cleaning and inspection of the cylinder head and valve train components during an engine overhaul on Mazda Protege?

  A:

  Careful cleaning of the cylinder head(s) and associated valve train parts, and careful examination of the parts, will allow you to determine the amount of valve service work required during the engine overhaul. Cleanse all of the old materials of gasket, sealing compound off the head gasket, intake manifold, and exhaust manifold sealing surfaces, and be careful not to gouge the cylinder head. Apply some special gasket-removal solvents that can be found at auto parts stores. Wipe all accumulated scale off the passages leading to the coolant and scrape a hard steel brush in the different holes to remove deposits. When there are heavy deposits of rust, then you can think over glossing by a machine shop. Clean up with a compressor of appropriate size, using a tap in each threaded hole to remove both corrosion and thread sealant, and remove debris using compressed air where possible. Clean the exhaust and intake threads with a wire brush and then clean the cylinder head in solvent and dry it completely using the power of compressed air. Decarbonization of chemicals can also come in handy but must be done cautiously. Wipe the lifters with the solvent and ensure that they are arranged so that they do not get mixed. Wipe down all the valve springs, spring seats, keepers and retainers individually to avoid any confusion. Cleaning The valves should be cleaned by a motorized wire brush, ensuring that the deposits are organized. Examine head: cracks, coolant leak, etc., seek advice of machine shop. Inspect the head gasket mating surface with a straightedge and feeler gauge and check the valve seats to see whether they are pitted, cracked or burned. Measure stem-to-guide clearance, deflection and record excessive movement that could necessitate guide replacement. Check every face of the valves, wear, deformation, and cracks and measure the width of the margin to know whether it should be replaced or not. Wear and free length Check valve springs and make sure that they are within specifications and be sure that they are square by placing them on a flat surface. Check spring retainers and keepers, looking at them in regards to wear and cracks, and replace any doubtful items. Any broken, or worn out parts, should be changed, and in case of inspection showing them to be in a bad condition, reassemble the valves in the cylinder head.
• Cylinder Head
  FS7N-10-100
  Q: What precautions should be taken regarding the Cylinder Head before beginning the engine procedure on Mazda Protege?

  A:

  Be careful: This procedure should not start before the engine is thoroughly cooled. Un-screw the negative cable of the battery and pull out the spark plugs. Empty the engine block and radiator of the coolant. Take out the engine oil and replace the oil filter. Take out the intake air intake tube assembly out of the intake plenum. Allow the resonance tube to be removed above the radiator, where appropriate. Unplug throttle cable (on automatic transmission models) and accelerator cable. Disassemble the brake vacuum hose, the fuel hose, radiator hoses, the purge control vacuum hose (intake plenum to firewall area), cruise control vacuum hose (where applicable) and the heater hoses and label them to be reinstalled later. Cut off any electrical connectors/wiring harness connections to the cylinder head, labeling the connectors to be installed later. Eliminate water bypass bolts/nuts where necessary, the bypass bolts are attached on the engine head. Take away the water pump pulley and a belt. Eliminate the air intake plenum and the fuel rail. DisJoin the exhaust pipe of the Exhaust Manifold and detach the exhaust manifold. Take off covers of the Timing Belt and the timing belt. Disconnect power steering pump and alternator drive belt(s). Take out the alternator brackets. On models up to 1998, delete the distributor, on 1999 and up delete the camshaft position sensor. Disassemble the power steering pump, where necessary, and place it on the side without unscrewing the hoses. Inspect the cylinder head and label and remove all other parts that will cause an obstruction when removing the cylinder head. On DOHC engines, the camshafts are removable to expose the head bolts. Loose the bolts of the cylinder head sequentially but in 1/4-turn steps, loosening them with a breaker bar and the correct Allen-head driver or socket, and then loosening them until they become removable with the hand. Removal of the cylinder head Lift the cylinder head off the engine block, prying up at the transaxle end, if it is stuck. Cleaning and inspection of the head This is best performed by removing all external parts to enable complete cleaning and inspection. When the cylinder head is fitted the mating surfaces of the cylinder head and block should be clean. Clean the mating surfaces of all carbon and old gasket, using a gasket scraper, and wipe the surfaces with lacquer thinner or acetone. In case there is any oil residue on the mating surfaces during the time the head is fitted, the gasket might not be fitted appropriately and leakages may occur. Putting together the block, to keep debris out of the cylinders, stuff the cylinders with clean shop rags and use a vacuum cleaner to take material into the cylinders, being careful not to gouge the soft aluminum of cylinder head. Inspect the block and head mating surfaces and look at them on nicks and deep scratches, and other damage; should it be slight it can be removed with a file, but when extreme, machining is the only option. Chase the thread of the head bolts using a thread die of the appropriate thread size without cutting any metal off the threads. In case of any metal cuttings as the threads are pursued, discontinue and replace the bolt by a new OEM replacement cylinder head bolt, specifically made and programmed to fit in this engine, and make sure it is right length and thread type. Wipe away the broken bolt and tap a hole using a thread-matching screw then clean away the holes with compressed air so that no residual is left and the threads are not ruined. Install the parts that have been removed in the head. Put the new gasket on the dowel pins of the block and place the head of the block on the new gasket with care not to press it out. Prior to fitting the head bolts, a small portion of engine oil which is clean should be applied on the threads, and then the bolts should be put in place and tightened either by fingers or using a wrench. Install the bolts in a few stages and according to the recommended order to a defined torque. The rest of the installation processes are in the opposite way of removal. Add oil to the engine, replace the cooling system and replace the oil filter. Test the engine and look at any leaks, adjust the ignition timing and road test. Oftentimes recheck the level of coolant during the initial hundred miles so that you know that there is no leakage.