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Car engine overhaul BMW 7 Series E32
Engine Overhaul. General Information
This section includes descriptions of the basic repair procedures for the cylinder head, engine block and its internal components. The information provided...
This section includes descriptions of the basic repair procedures for the cylinder head, engine block and its internal components. The information provided...
Engine overhaul. General information
High mileage is not always an indication that a rebuild is necessary, nor is low mileage always an indication that a rebuild can be avoided. Frequency of...
High mileage is not always an indication that a rebuild is necessary, nor is low mileage always an indication that a rebuild can be avoided. Frequency of...
Checking the compression in the cylinders
Checking the compression in the cylinders will show what condition the upper part of the engine is in (i.e. pistons, rings, valves, head gasket). Specifically,...
Checking the compression in the cylinders will show what condition the upper part of the engine is in (i.e. pistons, rings, valves, head gasket). Specifically,...
Engine Removal — General Information
Before removing the engine, it is necessary to clean the engine compartment from dirt and traces of oil. A winch or lift is required. Prepare all necessary...
Before removing the engine, it is necessary to clean the engine compartment from dirt and traces of oil. A winch or lift is required. Prepare all necessary...
Engine Removal — Methods and Precautions
If you decide that the engine needs to be removed for overhaul or repair, there is some preparatory work that needs to be done. It is extremely important to...
If you decide that the engine needs to be removed for overhaul or repair, there is some preparatory work that needs to be done. It is extremely important to...
Engine — removal and installation
Warning: Gasoline is extremely flammable, so extreme caution must be exercised when working on any part of the fuel system. Do not smoke or allow open flames...
Warning: Gasoline is extremely flammable, so extreme caution must be exercised when working on any part of the fuel system. Do not smoke or allow open flames...
Engine repair options
A mechanic who intends to perform an engine overhaul will have to make a number of choices. The decision to replace the cylinder block, piston/connecting rod...
A mechanic who intends to perform an engine overhaul will have to make a number of choices. The decision to replace the cylinder block, piston/connecting rod...
General preparation for engine repair
So, the engine is on the shop floor, separated from the transmission. The oil has been drained and all coolant has been removed. Sometimes this is not the...
So, the engine is on the shop floor, separated from the transmission. The oil has been drained and all coolant has been removed. Sometimes this is not the...
Engine overhaul — sequence of disassembly and assembly
Note: This chapter provides a general procedure for disassembling and assembling engines. For detailed information on checking individual engine components,...
Note: This chapter provides a general procedure for disassembling and assembling engines. For detailed information on checking individual engine components,...
Camshaft(s) — Removal and Installation
M30 Series Engine Camshaft - Removal and Installation Mounting elements of the camshaft of the M30 series engine 1 — chain; 2 - asterisk; 3 — lock washer; 4 -...
M30 Series Engine Camshaft - Removal and Installation Mounting elements of the camshaft of the M30 series engine 1 — chain; 2 - asterisk; 3 — lock washer; 4 -...
Cylinder head — disassembly
Elements of the gas distribution mechanism of the M30 series engine 1 - rocker axis; 2 - cork; 3 — axis; 4 - lining; 5 - spring cup; 6 - outer spring; 7 -...
Elements of the gas distribution mechanism of the M30 series engine 1 - rocker axis; 2 - cork; 3 — axis; 4 - lining; 5 - spring cup; 6 - outer spring; 7 -...
Cylinder head — cleaning and inspection
If the engine has been overheating significantly, the cylinder head may have become warped. Clean all traces of sealant and old gaskets from the surface of the...
If the engine has been overheating significantly, the cylinder head may have become warped. Clean all traces of sealant and old gaskets from the surface of the...
Cylinder head
Carefully inspect the cylinder head for cracks, signs of coolant leakage, or other damage. If there are cracks and they cannot be repaired in a specialized...
Carefully inspect the cylinder head for cracks, signs of coolant leakage, or other damage. If there are cracks and they cannot be repaired in a specialized...
Lapping valves
Clean all valves from carbon deposits. Make sure the valve and seat surfaces are clean, apply grinding paste evenly to the valve surface. Using a suction cup,...
Clean all valves from carbon deposits. Make sure the valve and seat surfaces are clean, apply grinding paste evenly to the valve surface. Using a suction cup,...
Valve seats — processing
The treatment of valve seats with traces of wear or carbon deposits can be performed on all engines if the correction angle and width of the contact surface...
The treatment of valve seats with traces of wear or carbon deposits can be performed on all engines if the correction angle and width of the contact surface...
Valve guides — checking and replacing
When restoring a cylinder head with leaky valves, it is not enough to treat the valves and valve seats or replace them. It is very important to check the valve...
When restoring a cylinder head with leaky valves, it is not enough to treat the valves and valve seats or replace them. It is very important to check the valve...
Cylinder head — assembly
Sequence of installation of valve elements 1 — valve; 2 - valve stem seal; 3 - lower spring plate; 4 - valve spring; 5 - upper spring plate; 6 - valve...
Sequence of installation of valve elements 1 — valve; 2 - valve stem seal; 3 - lower spring plate; 4 - valve spring; 5 - upper spring plate; 6 - valve...
Pistons and connecting rods — removal
Typical elements of a crank mechanism 1 — crankshaft; 2 — main bearing shells; 3 - thrust bearings; 4 — connecting rod; 5 — connecting rod bearing shell; 6 —...
Typical elements of a crank mechanism 1 — crankshaft; 2 — main bearing shells; 3 - thrust bearings; 4 — connecting rod; 5 — connecting rod bearing shell; 6 —...
Crankshaft — Removal
Caution: Before removing the crankshaft, the following must be removed: flywheel, oil pan, oil pump, pistons with connecting rods and rear oil seal housing....
Caution: Before removing the crankshaft, the following must be removed: flywheel, oil pan, oil pump, pistons with connecting rods and rear oil seal housing....
Cylinder Block — Cleaning
Most engine plugs are badly corroded from the time the engine has been running. Place a small chisel on one end of the plug and hammer it in until the other...
Most engine plugs are badly corroded from the time the engine has been running. Place a small chisel on one end of the plug and hammer it in until the other...
Cylinder Block — Check
The block must be cleaned before testing. Inspect the block for cracks, corrosion, or damage to the threads in the holes. A special workshop can check for...
The block must be cleaned before testing. Inspect the block for cracks, corrosion, or damage to the threads in the holes. A special workshop can check for...
Cylinder honing
Before assembling the engine, the cylinder walls should be honed to allow the new piston rings to fit onto the walls. Honing can be done independently using...
Before assembling the engine, the cylinder walls should be honed to allow the new piston rings to fit onto the walls. Honing can be done independently using...
Pistons and connecting rods — check
Before checking, the pistons and connecting rods must be cleaned and the old rings removed from the pistons. Caution: Install new piston rings whenever the...
Before checking, the pistons and connecting rods must be cleaned and the old rings removed from the pistons. Caution: Install new piston rings whenever the...
Crankshaft — Check
Clean the crankshaft with solvent and dry it. Clean the oil holes with a stiff brush and wash them with solvent. Check the main and connecting rod journals for...
Clean the crankshaft with solvent and dry it. Clean the oil holes with a stiff brush and wash them with solvent. Check the main and connecting rod journals for...
Main and connecting rod bearings — inspection
Although the connecting rod and main bearings are replaced with new ones during reconditioning, the old bearings should be left for detailed examination, as...
Although the connecting rod and main bearings are replaced with new ones during reconditioning, the old bearings should be left for detailed examination, as...
Inspection and repair of the flywheel
If the flywheel end surface shows scratches or pits due to clutch slippage, it may be necessary to resurface the surface. Overheating can cause surface cracks....
If the flywheel end surface shows scratches or pits due to clutch slippage, it may be necessary to resurface the surface. Overheating can cause surface cracks....
General instructions for engine assembly
If the work has been done carefully and all the elements have been repaired or replaced, the engine is ready for assembly. This is the most enjoyable part of...
If the work has been done carefully and all the elements have been repaired or replaced, the engine is ready for assembly. This is the most enjoyable part of...
Crankshaft — Installation and Checking of Main Bearing Oil Clearance
Checking the oil clearance of the main bearings Regardless of how the bearing size was determined, use a plastic gap gauge to determine the clearance size....
Checking the oil clearance of the main bearings Regardless of how the bearing size was determined, use a plastic gap gauge to determine the clearance size....
Piston rings — installation
Before installing piston rings, it is necessary to check the gaps between the ends of the rings. (It is assumed that the piston ring lateral clearance has...
Before installing piston rings, it is necessary to check the gaps between the ends of the rings. (It is assumed that the piston ring lateral clearance has...
Pistons and connecting rods — installation and checking of connecting rod bearing oil clearance
Before installing the pistons and connecting rods, the cylinder walls must be thoroughly cleaned, the top edge of the cylinder chamfered, and the crankshaft...
Before installing the pistons and connecting rods, the cylinder walls must be thoroughly cleaned, the top edge of the cylinder chamfered, and the crankshaft...
Initial start-up and debugging of the engine after repair
Caution: When starting the engine for the first time, have a fire extinguisher handy. Once the engine is installed in the vehicle, check the oil and coolant...
Caution: When starting the engine for the first time, have a fire extinguisher handy. Once the engine is installed in the vehicle, check the oil and coolant...
Engine fault diagnostics
If the engine does not start, the fault must be looked for systematically. In order for the engine to start at all, two basic conditions must be met for a...
If the engine does not start, the fault must be looked for systematically. In order for the engine to start at all, two basic conditions must be met for a...
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