Question 1

How to clean and inspect the cylinder head and valve train components during an engine overhaul on Ford Bronco?

Accepted Answer

These decarbonizing chemicals are very beneficial in the cleaning of cylinder head and valve train parts, but are very aggressive and will hence require extreme precaution on their usage as reiterated on the container information. Cylinder head and a great many other related valve train parts should be cleaned and then inspected to discover what kind of valve service will be needed during the course of the engine overhaul. Start by using a wire cut to remove old gasket material and sealing compounds from the head gasket and intake and exhaust manifold sealing surfaces but a care should be taken not on gouge the cylinder head. Scrape off the coolant deposits from the passage, scrub off deposits in various holes by using a metal stiff wire brush, and to eliminate corrosion and thread sealant, tap the correct size into the threaded holes. It is recommended that the threads of the rocker arm bolt and the cylinder head are cleaned with solvent and then dried, though air drying can be accelerated with the help of application of air pressure. Rocker arms, fulcrums, and pushrods need to be cleaned individually and do not mix even if they are off the same cylinder, all valve springs, the keepers, and retainers must be cleaned individually too. Foul formations on these valves should be scraped off with the use of a wire brush on the heads and on the stems of the valves without interchanging the valves. Check the cylinder head for scratch, signs of coolant seepage and etc., if you find one you should replace the cylinder head. Use straightedge and feeler gauge on the head gasket mating surface for warpage and for pitted, cracked or burnt valve seats especially if they need professional valve service. Check the valve stem to guide clearance using a dial gauge and in case of any problem with the valve guides, contact an automotive machine shop. The faces of all valves should be checked for signs of wear, deformation and checks for crack; if there exist any of the mentioned, then the service of a professional is required. Check the margin width on each of the valves and replace those with a margin that is not wider than 1/32 of an inch. Examine check valve springs for wear or pits, measure that free length of springs is still to specifications, if its sagged then its should not be used. Check the squareness of every spring and also check for wear and crack on retainers and keepers and replace such parts. Rocker arm faces checked for wear and damage, rocker arm bolts or studs threads checked for wear as well as worn rocker arms are to be replaced. In order to inspect the general poor condition of the valve elements if exists, the valves installed that in cylinder head for further servicing advice; when no parts worn severely are found, and the valve face and seat are both in good conditions, the valve train parts can be directly reassembled for servicing.

Question 2

What are the steps involved in the removal and installation of a cylinder head in SOHC four cylinder engine on 2000-2011 Ford Ranger?

Accepted Answer

On 2.5L engines, have the air conditioning refrigerant recovered by a dealer service department or service station, then relieve the fuel system pressure. Disconnect the cable from the negative battery terminal and position the number one piston at Top Dead Center (TDC) on the compression stroke. Drain the cooling system, remove the air cleaner assembly and air duct, and take off the drivebelt. Remove the bolt retaining the heater hose to the valve cover if equipped, then take out the spark plug wires, ignition coil packs, and spark plugs. Label and disconnect any electrical connectors or vacuum hoses attached to components on the cylinder head, and remove the dipstick tube. Remove the upper and lower intake manifolds, the valve cover, and the air conditioning compressor from its mounting bracket without disconnecting the hoses. Remove the bracket, power steering pump, and alternator bracket mounting bolts, then disconnect the upper radiator hose at both ends. Remove the radiator fan/clutch assembly, water pump pulley, and timing belt front cover, confirming that all camshaft and crankshaft marks are still aligned before loosening the timing belt tensioner and removing the timing belt from the camshaft or oil pump sprockets. Remove the heat shield from the exhaust manifold and the exhaust manifold mounting bolts, allowing the manifold to remain in place. Remove the timing belt tensioner bolts and spring stop from the cylinder head, disconnect the oil pressure sending unit wiring harness connector, and remove the intake manifold. Using a new head gasket, outline the cylinders and bolt pattern on cardboard, indicating the front of the engine and punching holes at the bolt locations. Loosen the cylinder head mounting bolts in 1/4-turn increments until they can be removed by hand, storing them in the cardboard holder to ensure proper reinstallation. Lift the head off the engine, using a soft-face hammer or block of wood if necessary to break the gasket seal, and place it on a block of wood to prevent damage to the gasket surface. If a new cylinder head is being installed, transfer all external parts from the old head to the new one, ensuring the mating surfaces of the cylinder head and block are perfectly clean. Use a gasket scraper to remove all traces of carbon and old gasket material, then clean the surfaces with lacquer thinner or acetone, taking care to remove any debris that falls into the cylinders. Check the block and head mating surfaces for damage, using a file for slight imperfections and considering machining for excessive damage. Chase the threads in the head bolt holes with a tap of the correct size, and run a die down the threads of each bolt to remove corrosion. Position the new gasket over the dowel pins in the block without using a gasket sealer, and confirm that the crankshaft is at TDC, rotating it if necessary. Before installing the cylinder head, turn the camshaft until the pin is in the five o'clock position to avoid valve damage, ensuring the camshaft lobes are in the correct position for all valves to be seated. Carefully position the head on the block without disturbing the gasket, install the cylinder head bolts, and tighten them in sequence to the specified torque. Return the camshaft to its original TDC position, and complete the installation in reverse order of removal, finishing by changing the engine oil and filter.

OEM Ford Cylinder Head

240 Cylinder Heads found

Ford Cylinder Head, Passenger Side Part Number: FR3Z-6049-A

Ford Cylinder Head, Driver Side Part Number: JC3Z-6049-B

Ford Cylinder Head, Passenger Side Part Number: BC3Z-6049-T

Ford Cylinder Head, Passenger Side Part Number: FL3Z-6049-K

Ford Cylinder Head, Driver Side Part Number: BC3Z-6049-U

Ford Cylinder Head Part Number: GR3Z-6049-G

Ford Cylinder Head, Passenger Side Part Number: 9C3Z-6049-C

Ford Cylinder Head Part Number: LC3Z-6049-K

Ford Cylinder Head Part Number: CJ5Z-6049-B

Ford Cylinder Head Part Number: LC3Z-6049-SL

Ford Cylinder Head Part Number: LC3Z-6049-E

Ford Cylinder Head Part Number: ML3Z-6049-E

Ford Cylinder Head Part Number: ML3Z-6049-H

Ford Cylinder Head, Driver Side Part Number: GL3Z-6049-A

Ford Cylinder Head, Driver Side Part Number: JT4Z-6049-B

Ford Cylinder Head, Passenger Side Part Number: GL3Z-6049-B

Ford Cylinder Head, Driver Side Part Number: CR3Z-6049-D

Ford Cylinder Head, Passenger Side Part Number: CR3Z-6049-C

Ford Cylinder Head Part Number: 8C3Z-6049-BRM

Ford Cylinder Head, Driver Side Part Number: HC3Z-6049-B

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