Car engine overhaul BMW 5 Series E28
This document describes the overhaul procedures for the cylinder head and internal engine components. From recommendations for preparing for a major overhaul and the acquisition of new elements, to detailed paragraph-by-paragraph procedures covering the removal and installation of internal engine components and inspection of elements. The following Sections are set out under the suggestion that the engine be removed from the vehicle.
General information about engine overhaul
The question of whether and when a complete engine overhaul should be carried out is not always an easy one to decide as several circumstances need to be...
The question of whether and when a complete engine overhaul should be carried out is not always an easy one to decide as several circumstances need to be...
Checking the compression ratio
The compression ratio check shows what the mechanical condition of the top level of the engine is (pistons, rings, valves, head gaskets). In particular, the...
The compression ratio check shows what the mechanical condition of the top level of the engine is (pistons, rings, valves, head gaskets). In particular, the...
Engine Removal Methods and Precautions
If the decision is made to remove the engine for an overhaul or major overhaul, then some preliminary steps should be taken. It is extremely important to...
If the decision is made to remove the engine for an overhaul or major overhaul, then some preliminary steps should be taken. It is extremely important to...
Removal and installation of the engine
If your vehicle's radio is equipped with an anti-theft system, make sure you know the correct activation code before disconnecting the battery. If, after...
If your vehicle's radio is equipped with an anti-theft system, make sure you know the correct activation code before disconnecting the battery. If, after...
Engine overhaul options
Self-repair of the engine can be performed in several ways. The decision to replace the cylinder block, piston/connecting rod assemblies and crankshaft depends...
Self-repair of the engine can be performed in several ways. The decision to replace the cylinder block, piston/connecting rod assemblies and crankshaft depends...
The procedure for disassembling the engine during a major overhaul
It is much easier to disassemble the engine and work with it on a portable stand. You can often rent a stand inexpensively at a tool rental office. Before...
It is much easier to disassemble the engine and work with it on a portable stand. You can often rent a stand inexpensively at a tool rental office. Before...
Disassembly of the cylinder head
1. Remove the cylinder head (see Part Repair work carried out without removing the engine from the car ). 2. Remove the oil pipe from the top of the cylinder...
1. Remove the cylinder head (see Part Repair work carried out without removing the engine from the car ). 2. Remove the oil pipe from the top of the cylinder...
Cleaning and checking the condition of the cylinder head and components
Thorough head cleaning (heads) cylinders and associated valve components, followed by a detailed condition check, will determine how much valve work needs to...
Thorough head cleaning (heads) cylinders and associated valve components, followed by a detailed condition check, will determine how much valve work needs to...
Valve maintenance
1. Check the condition of the valves, as described in Section Cleaning and checking the condition of the cylinder head and components (items 2 and 1). Replace...
1. Check the condition of the valves, as described in Section Cleaning and checking the condition of the cylinder head and components (items 2 and 1). Replace...
Cylinder head assembly
1. Before assembly, make sure the cylinder head is immaculately clean. 2. If the valve service head has been sent to the workshop, the valves will already be...
1. Before assembly, make sure the cylinder head is immaculately clean. 2. If the valve service head has been sent to the workshop, the valves will already be...
Removing pistons / connecting rods
1. Before removal of pistons/connecting rods in gathering remove a head of cylinders and the pallet. On M10, M20 and M30 engines, remove the oil pump. Refer to...
1. Before removal of pistons/connecting rods in gathering remove a head of cylinders and the pallet. On M10, M20 and M30 engines, remove the oil pump. Refer to...
Removing the crankshaft
The crankshaft can only be removed after the engine has been removed from the vehicle. It is assumed that the flywheel or drive plate, vibration damper, timing...
The crankshaft can only be removed after the engine has been removed from the vehicle. It is assumed that the flywheel or drive plate, vibration damper, timing...
Removing and checking the condition of the intermediate shaft
The intermediate shaft is used only on the M20 engine. The shaft rotates in the cylinder block parallel to the crankshaft. It is driven by the timing belt and...
The intermediate shaft is used only on the M20 engine. The shaft rotates in the cylinder block parallel to the crankshaft. It is driven by the timing belt and...
Cleaning the cylinder block
Plugs installed in the cooling channels of the unit may be difficult to remove or even not be removed at all. 1. Remove the plugs from the cylinder block. To...
Plugs installed in the cooling channels of the unit may be difficult to remove or even not be removed at all. 1. Remove the plugs from the cylinder block. To...
Checking the condition of the cylinder block
1. Before checking the status, the unit should be cleaned (see Section Cleaning the cylinder block ). 2. Visually inspect for cracks, rust and corrosion. Look...
1. Before checking the status, the unit should be cleaned (see Section Cleaning the cylinder block ). 2. Visually inspect for cracks, rust and corrosion. Look...
Cylinder honing
Before assembling the engine, the cylinders must be honed so that the piston rings are seated properly and provide the best possible tightness of the...
Before assembling the engine, the cylinders must be honed so that the piston rings are seated properly and provide the best possible tightness of the...
Checking the condition of pistons / connecting rods
The piston/connecting rod assemblies must be cleaned and the old rings removed from the pistons before the test can be carried out. When assembling the engine,...
The piston/connecting rod assemblies must be cleaned and the old rings removed from the pistons before the test can be carried out. When assembling the engine,...
Checking the condition of the crankshaft
1. Use a scraper, file, or abrasive stone to remove any burrs from the crankshaft oil holes. 2. Wash the crankshaft with solvent and dry with compressed air...
1. Use a scraper, file, or abrasive stone to remove any burrs from the crankshaft oil holes. 2. Wash the crankshaft with solvent and dry with compressed air...
Checking the condition of the main and connecting rod bearings
Although the main and connecting rod bearings must be replaced during a major overhaul, the old bearings should be kept for close inspection, as this can...
Although the main and connecting rod bearings must be replaced during a major overhaul, the old bearings should be kept for close inspection, as this can...
Engine assembly sequence during overhaul
Before assembling the engine, make sure you have all the necessary new parts, gaskets and seals, as well as the following items: General purpose hand tools...
Before assembling the engine, make sure you have all the necessary new parts, gaskets and seals, as well as the following items: General purpose hand tools...
Installation of piston rings
Before installing new piston rings, the piston ring clearances must be checked. It is assumed that the piston ring backlashes have already been measured and...
Before installing new piston rings, the piston ring clearances must be checked. It is assumed that the piston ring backlashes have already been measured and...
Installation of an intermediate shaft
1. Clean the surfaces of the intermediate shaft bearings and the bearing bushes pressed into the cylinder block. 2. Lubricate the shaft and insert it into the...
1. Clean the surfaces of the intermediate shaft bearings and the bearing bushes pressed into the cylinder block. 2. Lubricate the shaft and insert it into the...
Installing the crankshaft and checking the lubrication gaps of the main bearings
Installing the crankshaft is the first important step in assembling an engine. This step assumes that the cylinder block and crankshaft have been cleaned,...
Installing the crankshaft is the first important step in assembling an engine. This step assumes that the cylinder block and crankshaft have been cleaned,...
Installation of a back epiploon of a cranked shaft
1. Install the crankshaft first, then tighten the main bearing cap bolts. Then a new oil seal is installed in the holder and the bolts securing the holder to...
1. Install the crankshaft first, then tighten the main bearing cap bolts. Then a new oil seal is installed in the holder and the bolts securing the holder to...
Installing the piston / connecting rod assemblies and checking the lubrication gaps in the connecting rod bearings
1. Before installing the piston/connecting rod assemblies, the cylinder walls must be immaculately clean, the top edge of each cylinder must be chamfered, and...
1. Before installing the piston/connecting rod assemblies, the cylinder walls must be immaculately clean, the top edge of each cylinder must be chamfered, and...
Starting and running in the engine after a major overhaul
Always have a fire extinguisher ready when starting the engine for the first time. 1. After installing the engine on the vehicle, carefully check the oil and...
Always have a fire extinguisher ready when starting the engine for the first time. 1. After installing the engine on the vehicle, carefully check the oil and...
Engine Troubleshooting
Symptom Possible reason Engine won't crank when trying to start The battery terminals are oxidized, or the wire lugs are loose on them (see chapter Car...
Symptom Possible reason Engine won't crank when trying to start The battery terminals are oxidized, or the wire lugs are loose on them (see chapter Car...
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