Question 1

How to remove and install the cylinder head on 2.4L engine on Honda Civic?

Accepted Answer

Before starting work, release any fuel system pressure and disconnect the black battery cable to reduce likelihood of electrical mishaps while working. Drain the cooling system. Remove the drivebell and the drivebelt tensioner. Remove the catalytic converter/exhaust manifold. Remove the intake manifold. First take off the timing chain, the camshafts, and the rocker arm unit. Disconnect the head's electrical wires that block the removal process, using tape to label each connection correctly for reassembly. Also, detach any coolant lines that would interfere. Loosen the cylinder head bolts gradually, twice as fast when removing as you tightened them by 1/4 turn per bolt at a time. Save the bolts for reuse and throw out the old ones. To get the cylinder head off, first lift it carefully, then use wood, block, and hammer if you feel any resistance. If the cylinder head still doesn't come off, use a cast contracting tool to force it from its spot. Set the cylinder head on wood blocks before you start to protect the gasket areas, then take off the old gasket. Before installing the head, both surfaces - cylinder head and engine block - need to be absolutely free of carbon and old gasket material, which you can wipe down entirely using brake system cleaner. Examine the engine block and cylinder head contact areas for bumps, large scrapes, and other damage. Also have a car repair shop check the cylinder head to see if it's not flat enough. You must run a matching tap tool in each of the small openings where your cylinder head bolts will go, to keep the threads clean and in good shape. Keep the new gasket placed where it belongs on the block where the dowels are. Sit the cylinder head gently on the engine block, place new bolts in place, and tighten them in order, according to the specified force. Put the rocker arm parts in place, then fit the camshafts back, put on the timing chain, and put the exhaust system and fuel intake systems back on. To reinstall everything, follow the steps we just went through in reverse order. Reattach the battery, replace engine oil and filter, top up your engine's cooling system, and start the engine to check for any oil or coolant leaks.

Question 2

What steps should be taken for thorough cleaning and inspection of the cylinder head and valve train components during an engine overhaul on Honda Del Sol?

Accepted Answer

Intensive washing of the cylinder head and other associated with this part parts of the valve train together with their careful examination will allow to define the amount of necessary valve first during the further work on the engine. Start by removing all the gasket materials and sealants from the head gasket, intake and exhaust manifold surfaces but be very careful not to harm the cylinder head. Scrape off the accumulated deposits on the coolant passages and scrub with a stiff wire brush on the various holes. Deburr the threaded holes of course, with clean up to such size in taps; by compressed air if possible, remove corrosion and debris. Remove any dirt, oil or grease on the threads of the camshaft bearing cap bolt and the cylinder head using solvent, after which wipe with clean cloth and the use compressed air is recommended until the surface is very dry. Use decarbonizing chemicals where necessary but with due regard to the instructions issued above. Remove the rocker arms and remove the bearing caps; then clean all the parts with solvent then make sure that the parts are duly dried without interchanging the following parts: valve springs, spring seats, keepers and retainers for one valve only. Scrape off the large volumes on the valves with a motorized wire brush while avoiding the cross loading of the lots. Check for cracks and coolant leakage and other damages on the cylinder head and you may need to seek an automotive machine shop for a fix. Verify the head gasket mating surface for warpage using a straightedge and a feeler gauge and inspect the valve seats for pitting, cracking or burning that may be required professional valve reconditioning. Check the valve stem-to-guide clearance with a dial indicator and if you have any of the concerns about the valve guides take it to a machinist. Check each of the face of the valves for any sign of wear, deformation or cracks and check the margin widths and replace such valves as do not conform to the acceptable standard. On each valve spring, freely measured and examined for wear and pits, free length and its must no less than the prescribed length, it must be checked for squareness. Please check the springs retainers and keepers for their condition, that means they should be checked for signs or wear and cracks and if any of the part seems to be in bad condition then it must be replaced in order to avoid failure during operation. If action a results in a poor condition of the valve components, then reinstall the valves into the cylinder head.

Question 3

What are the key types, components, and rebuilding procedures for automobile cylinder heads on Honda Prelude?

Accepted Answer

There are two basic types of cylinder heads used on today's automobiles, OHV and OHC, with reference to OHC, SOHC and DOHC. In general, a head equipped with a single camshaft is an OHC head and an engine with an OHV cylinder head is referred to as a push rod engine. Aluminum alloy is used in most cylinder heads because of light weight, strength, and heat dissipation; however, cast iron is still applied in numerous vehicles. All cylinder heads incorporate valves and seats; most have two valves per cylinder, while higher engine grades include multiple valves per cylinder arrangement. The valve stoke with the seat of the precision machined surface sealing the combustion chamber while each of the valve has guide offer centreing and freedom of movement. The valve by its guide clearance is very delicate; if the clearance is too large, the valve will consume oil and cause damage; if it is too small, the valves will stick. Valve springs are responsible for maintaining the position of the valves to against their seats and to revert to this position each time they are actuated. Essentially, when a cylinder head is rebuilt it has to have new valves, guides, seats and spring, but not always depending the maintenance of the engine. Wear results from poor tuning, in the sense that rich mixtures wash oil from guides, and that lean mixtures causes excessive heat. Mileage also affects wear; however, there are many parts here that can be machined and re-employed. In case one of the valve is burnt then all the valves in the same circuit should be replaced to avoid the same operating conditions that caused the burning of the first valve. The heads of OHC are also dismantled to reveal the parts that need changing; due to the presence of two camshafts, it can be complex to label the parts properly. In this case the camshaft followers are of cup-type and thus a C-clamp style valve spring compressor and an OHC spring removal tool shall be used while in case of rocker arm-type camshaft followers, a standard valve spring compressor may be necessary. Inspection of cleaned components consists of examination of valves in terms of crack, wear, tulipping while measurement of valve guides and spring are conducted to determine their specifications. Apart from the above, there are certain key characteristics of the cylinder head that should be checked they include guide condition, seals, flatness of surface and any signs of crack as well as any form of physical damage. Reconditioning and reconditioning usually needs a little machinist work; especially guides and seats whilst assembling needs a considerable amount of greasing and positioning of different parts of the valve.

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