The principle of operation of the engine A piston engine is a metal block containing a series of round chambers, or cylinders. These chambers can be arranged in a line in a row or in a V-shape; therefore, in the description, the engine is referred to as "4",...
Tips for major repairs Most engine overhaul procedures are fairly standard. In addition to the procedures for replacing certain parts and the complete specifications of your engine, this Chapter is also a guide to common remanufacturing...
Checking engine compression Significant lack of engine power, excessive oil and/or fuel consumption are all indicators of internal engine wear. Worn piston rings, gouged or worn liner surfaces, leaking gases through the cylinder head gasket,...
Engine — removal and installation CAUTION: If any repair operation requires the removal of an air conditioning system component (on equipped vehicles), do not disconnect lines with refrigerant. If it is not possible to move the component out of the way...
Valve cover or rocker cover — removal and installation Withdrawal 1. On some models, it will be necessary to remove the air filter assembly. 2. Disconnect the ground cable, wires to the spark plug (if it is needed) and throttle cable (if it is needed) from the rocker cover....
Rocker axle — removal and installation Rocker arms and axle are a single unit and are removed together. Refer to section " Camshaft, removal and installation ". The camshaft can be removed after removing the rocker arms, their axles and rack assemblies. For...
Thermostat — removal and installation The thermostat housing is located on the cylinder head on all models except the 1990-91 Accord, where it is located at the end of the water pump intake pipe. 1. Disconnect the cable from the negative battery terminal....
Intake manifold — removal and installation Models with a carburetor 1. Place a clean, dry container under the radiator, remove the plug, and drain the coolant from the radiator. 2. Remove the air filter and its casing from the carburetor. 3. Remove the air...
Exhaust manifold — removal and installation Carburetor engines WARNING: DO NOT perform this procedure on a hot or even warm engine. 1. Raise and secure the vehicle. 2. Unscrew the nuts securing the manifold to the exhaust pipe, remove the pipe, move the pipe away...
Radiator and electric fans — removal and installation Honda engines use a water cooling system. The coolant, circulating through the pipes under the action of the water pump, heats up as the number of cycles through the engine increases. As the coolant circulates in the...
Oil cooler — removal and installation Fuel-injected PRELUDE vehicles since 1988 have used a water-cooled oil filter to remove some of the heat from the oil flow. The same cooling system appears on the 1991 ACCORD cars. Coolant flows through the oil cooler...
Water pump — Accord 1984-89 and Prelude 1984-87 These operations require the removal and installation of a large number of small parts. Some of the operations can be performed both from above and below, depending on the length of your arms and skill. If you are...
Water Pump — Accord 1990-91 WARNING: These operations include the removal and installation of the camshaft drive belt. DO NOT attempt to remove the water pump unless you know how to install the camshaft belt. Withdrawal 1. Disconnect the cable...
Water pump — Prelude 1988-91 This operation requires the removal of the camshaft drive belt. DO NOT attempt to remove the water pump unless you know how to remove the camshaft drive belt. Withdrawal 1. Disconnect the cable from the negative battery...
Cylinder head — 1984-89 Accord and Prelude, SOHC engine The Environmental Protection Agency warns that prolonged contact of engine oil with the skin causes skin pathology, including skin cancer. Use a variety of protective equipment to minimize such contact. Wear protective...
Cylinder head — 1988-89 Prelude, DOHC engine The temperature of the cylinder head must be below 38°C; let the engine cool down for a few hours. Rotate the flywheel so that the number one piston is at top dead center. Withdrawal 1. Disconnect the earth cable from...
Cylinder Head — 1990-91 Accord Withdrawal 1. Disconnect the cable from the negative battery terminal. 2. Set cylinder No. 1 to TDC by turning the crankshaft. 3. Drain the coolant from the cooling system. Use a clean container; close it with a lid...
Cylinder Head — 1990-91 Prelude Withdrawal 1. Disconnect the cable from the negative battery terminal. Crank the engine to bring the number 1 cylinder to TDC. 2. Raise and secure the vehicle. Drain the coolant. 3. On 2.0L engines. Remove the exhaust...
Cleaning and inspection of the cylinder head 1. Remove the valve assembly from the cylinder head. 2. Using a small wire brush, clean carbon deposits from combustion chambers and valve passages. 3. Inspect the cylinder head for cracks in the exhaust passages,...
Valve springs and valve stem seals The valve springs push the valve against the seat and close it after the camshaft action has opened it. Honda valve springs rarely fail. The springs must be removed to allow access to the valve stem seals. Valve stem...
Valves and springs — removal, installation and inspection Removal and installation A special puller is required to remove the valves and springs. A small magnet can be very useful for extracting cotters and spring washers. Place the cylinder head on its side on a stand....
Valve seats — inspection, removal and installation All valve seats in motors, hidden in guides, are non-replaceable and must be cut when service requires it. Cutting saddles requires special tools and experience and should be done in a machine shop. Seat concentricity...
Oil pan — removal and installation WARNING: Prolonged contact with USED engine oil can cause a number of skin conditions INCLUDING rec! You must make every effort to minimize your contact with used engine oil. Protective gloves must be worn when changing...
Oil pump — removal and installation 1988-91 Prelude, 1990-91 Accord Withdrawal 1. Drain the engine oil. Turn the crankshaft and align the white groove on the crankshaft pulley with the pointer on the camshaft belt cover (align the T mark on the flywheel...
Oil pump overhaul These procedures are performed with the oil pump removed from the engine. 1984-87 Prelude, 1984-89 Accord 1. Check the rotor radial clearance for both the inner and outer rotors. Gap - 0.15-0.20 mm. 2. Using a feeler...
Camshaft and cover belt — 1984-89 Accord, 1984-87 Prelude Withdrawal 1. Rotate the crankshaft to align the flywheel pointer with TDC (TDC) on the compression stroke of cylinder 1. 2. Remove the bolts of the valve cover and the top cover of the camshaft drive belt and the...
Camshaft and Cover Belt — 1990-91 Accord Withdrawal See figures 95 and 97 . 1. Disconnect the wire from the negative battery terminal. 2. Rotate the engine to align the marks on the camshaft pulley and set cylinder #1 to TDC. Once the motor is in this...
Camshaft and cover belt — 1988-91 Prelude Withdrawal See drawings 100, 101 and 102 . 1. Disconnect the wire from the negative battery terminal. 2. Rotate the engine to align the marks on the camshaft pulley and set the number 1 cylinder to TDC. Once the motor...
Camshaft sprockets — removal and installation Withdrawal Although the camshaft drive belt does not need to be completely removed, it will need to be removed from the pulley (ov) camshaft. Take great care to protect the belt from bending, twisting and contamination...
Camshaft — SOHC engines Withdrawal The engine temperature must be below 38°C. To facilitate installation, make sure the Number 1 piston is at top dead center before removing the camshaft. 1. Remove valve cover. 2. Remove the distributor or...
Camshaft — DOHC engines Withdrawal The engine temperature must be below 38°C. To facilitate installation, make sure the Number 1 piston is at Top Dead Center before removing the camshaft. 1. Remove valve cover. 2. Remove the distributor or...
Pistons and connecting rods — removal This procedure requires the removal of the head and oil pan. It is much easier to do this work with the engine removed and installed on the stand. 1. If pistons and connecting rods are removed due to extreme wear,...
Connecting rod bearing replacement The connecting rod bearings in all Honda engines consist of two halves or shells that are not interchangeable for the connecting rod and cap. When the bushings are placed in place, their ends protrude slightly from the...
Inspection of pistons and connecting rods 1. Measure the cylinder liner at three levels (in the upper position of the upper ring, in the center and at the bottom of the cylinder) and in two directions (longitudinal and transverse dimensions) - only six...
Piston pin — installation The piston pin is pressed into place. Special tools are required for disassembly and assembly, including a pin drift, guide bushing, pin retainer spring mandrels, and a hydraulic press. 1. Remember that if you install...
Crankshaft and main bearings — removal and installation Except Accord 90-91 1. Remove the engine from the vehicle and place it on a work stand. 2. Remove the crankshaft pulley mounting bolts and washers. 3. Remove the front cover and air conditioning guide pulley assembly if...
Crankshaft and balancer shafts Accord 1990-91 Steps are given to remove the crankshaft without changing the position of the pistons in the cylinder block. 1. Remove the engine from the car, as well as the flywheel from the engine, unscrew the rear or...
Crankshaft main oil seals — removal and installation Accord 1984-89, Prelude 1984-87 1. Front and rear main oil seals are held on the crankshaft by end caps; they are released and removed with the crankshaft. When assembling, apply non-hardening grease at the seams where...
Flywheel / drive plate — removal and installation Withdrawal 1. Remove transmission. 2. Remove mounting bolts and flywheel. 3. The back cover can be removed (only for manual transmission). For installation: All major rotating parts, including the flywheel/drive plate,...
Exhaust system Precautionary measures For a number of reasons, working on the exhaust system can be the most dangerous job you can do on your vehicle. Always observe the following precautions: Securely anchor the vehicle. Wear safety...
Tightening torques for threaded connections Tightening torques Component Moment Generator - 1984-85 -- Generator regulator 22 Nm -- Rotary gods generator 45 Nm - 1986-89 -- Alternator through bolt and nut 45 Nm -- Top bolt 24 Nm - 1990-91 -- Generator cantilever...