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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 to perform a complete engine overhaul is not always easy to decide, as several factors need to be considered. High mileage...
The question of whether and when to perform a complete engine overhaul is not always easy to decide, as several factors need to be considered. High mileage...
Checking the compression ratio
Checking the compression ratio shows what the mechanical condition of the top end of the engine is (pistons, rings, valves, head gaskets). In particular, the...
Checking the compression ratio shows what the mechanical condition of the top end 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 a major or overhaul, there are some preliminary steps that should be taken. It is extremely important to...
If the decision is made to remove the engine for a major or overhaul, there are some preliminary steps that should be taken. It is extremely important to...
Removal and installation 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 an...
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 an...
Engine Overhaul Options
There are several options for performing a do-it-yourself engine repair. The decision to replace the cylinder block, pistons/connecting rods assembly, and...
There are several options for performing a do-it-yourself engine repair. The decision to replace the cylinder block, pistons/connecting rods assembly, and...
The procedure for disassembling the engine during major repairs
It is much easier to disassemble the engine and work with it on a portable stand. Often, a stand can be rented inexpensively from a tool rental agency. Before...
It is much easier to disassemble the engine and work with it on a portable stand. Often, a stand can be rented inexpensively from a tool rental agency. Before...
Disassembling the cylinder head
1. Remove the cylinder head (see Part Repair work carried out without removing the engine from the vehicle ). 2. Remove the oil pipe from the top of the...
1. Remove the cylinder head (see Part Repair work carried out without removing the engine from the vehicle ). 2. Remove the oil pipe from the top of the...
Cleaning and checking the condition of the cylinder head and components
A thorough cleaning of the cylinder head(s) and associated valve components followed by a detailed inspection of their condition will determine how much valve...
A thorough cleaning of the cylinder head(s) and associated valve components followed by a detailed inspection of their condition will determine how much valve...
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 perfectly clean. 2. If the valve head was sent to the workshop for valve service, the valves will already be...
1. Before assembly, make sure the cylinder head is perfectly clean. 2. If the valve head was sent to the workshop for valve service, the valves will already be...
Removal pistons/connecting rods
1. Before removing the piston/connecting rod assemblies, remove the cylinder head and oil pan. On M10, M20 and M30 engines, remove the oil pump. Refer to the...
1. Before removing the piston/connecting rod assemblies, remove the cylinder head and oil pan. On M10, M20 and M30 engines, remove the oil pump. Refer to the...
Removal 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, torsional vibration...
The crankshaft can only be removed after the engine has been removed from the vehicle. It is assumed that the flywheel or drive plate, torsional vibration...
Removal 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
The plugs installed in the cooling channels of the block may be difficult to remove or may not be removed at all. 1. Remove the plugs from the cylinder block....
The plugs installed in the cooling channels of the block may be difficult to remove or may not be removed at all. 1. Remove the plugs from the cylinder block....
Checking the condition of the cylinder block
1. Before checking the condition, the unit should be cleaned (see section Cleaning the cylinder block ). 2. Visually check for cracks, rust and corrosion. Look...
1. Before checking the condition, the unit should be cleaned (see section Cleaning the cylinder block ). 2. Visually check for cracks, rust and corrosion. Look...
Cylinder honing
Before assembling the engine, the cylinders must be honed to ensure that the piston rings seat properly and provide the best possible combustion chamber seal....
Before assembling the engine, the cylinders must be honed to ensure that the piston rings seat properly and provide the best possible combustion chamber seal....
Checking the condition of pistons / connecting rods
Before performing the inspection, the piston/connecting rod assemblies must be cleaned and the old rings removed from the pistons. Always use new rings when...
Before performing the inspection, the piston/connecting rod assemblies must be cleaned and the old rings removed from the pistons. Always use new rings when...
Checking the condition of the crankshaft
1. Use a scraper, file or abrasive stone to remove all burrs from the crankshaft oil holes. 2. Wash the crankshaft with solvent and dry with compressed air (if...
1. Use a scraper, file or abrasive stone to remove all burrs from the crankshaft oil holes. 2. Wash the crankshaft with solvent and dry with compressed air (if...
Checking the condition of main and connecting rod bearings
Although the main and connecting rod bearings are replaced during a major overhaul, the old bearings should be retained for careful inspection, as this can...
Although the main and connecting rod bearings are replaced during a major overhaul, the old bearings should be retained for careful inspection, as this can...
Sequence of engine assembly during major repairs
Before you begin assembling the engine, make sure you have all the necessary new parts, gaskets and seals, as well as the following items: General purpose hand...
Before you begin assembling the engine, make sure you have all the necessary new parts, gaskets and seals, as well as the following items: General purpose hand...
Installing piston rings
Before installing new piston rings, it is necessary to check the piston ring clearances. It is assumed that the piston ring side clearances have already been...
Before installing new piston rings, it is necessary to check the piston ring clearances. It is assumed that the piston ring side clearances have already been...
Installing the intermediate shaft
1. Clean the surfaces of the intermediate shaft bearings and the bearing bushings pressed into the cylinder block. 2. Lubricate the shaft and insert it into...
1. Clean the surfaces of the intermediate shaft bearings and the bearing bushings pressed into the cylinder block. 2. Lubricate the shaft and insert it into...
Installing the crankshaft and checking the main bearing lubrication clearances
Installing the crankshaft is the first important step in engine assembly. This step assumes that the cylinder block and crankshaft have been cleaned,...
Installing the crankshaft is the first important step in engine assembly. This step assumes that the cylinder block and crankshaft have been cleaned,...
Installing the rear crankshaft oil seal
1. First, install the crankshaft, then tighten the main bearing cap bolts. Then install a new seal in the holder and tighten the holder-to-block mounting...
1. First, install the crankshaft, then tighten the main bearing cap bolts. Then install a new seal in the holder and tighten the holder-to-block mounting...
Installing pistons/connecting rods assemblies and checking lubrication clearances in connecting rod bearings
1. Before installing the piston/connecting rod assemblies, the cylinder walls must be spotlessly clean, the top edge of each cylinder must be chamfered and the...
1. Before installing the piston/connecting rod assemblies, the cylinder walls must be spotlessly clean, the top edge of each cylinder must be chamfered and the...
Starting and running in the engine after major repairs
When starting the engine for the first time, have a fire extinguisher ready. 1. After installing the engine on the vehicle, carefully check the oil and coolant...
When starting the engine for the first time, have a fire extinguisher ready. 1. After installing the engine on the vehicle, carefully check the oil and coolant...
Engine fault diagnostics
Symptom Possible cause The engine does not turn over when trying to start The battery terminals are oxidized, or the wire ends are loose (see chapter Routine...
Symptom Possible cause The engine does not turn over when trying to start The battery terminals are oxidized, or the wire ends are loose (see chapter Routine...
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