Car engine overhaul Chevrolet Lumina 1

Technical data for overhaul of 3.1 liter engines
General characteristics RPO code - LG6 VIN code - D Cylinder displacement: 189 cubic inches Cylinder Compression Pressure - Minimum 100 psi The maximum...

Technical data for overhaul of 3.8 liter engines
General characteristics RPO code - L27 VIN code - L Cylinder displacement: 231 cubic inches Cylinder Compression Pressure - Minimum 100 psi The maximum...

General information about engine overhaul
This section of Chapter 2 describes the basic operations for major repairs of cylinder heads and internal engine components. The information provided includes...

Engine overhaul is a necessity
Determining if and when an engine overhaul is needed is not always easy, as there are a number of factors to consider when making this decision. High mileage...

Checking the compression in the cylinders
1. Checking the compression will provide information about the mechanical condition of the upper part of the engine (pistons, rings, valves, cylinder head...

Engine Removal — Precautions
If you decide to remove the engine for major repairs or other repair work, you must first do the following. It is extremely important to choose a suitable...

Removal and installation the engine
Warning 1. Please read the following instructions carefully to familiarize yourself with the necessary operations before starting work. In addition, you will...

Engine Overhaul Options
When performing a major engine overhaul, the owner has several options to choose from. The decision to replace the cylinder block, pistons with connecting rods...

Engine Overhaul — Disassembly Sequence
1. Disassembly and work with the engine are significantly simplified when the engine is installed on a stand. Before installing the engine on the stand, it is...

Disassembling the cylinder head
Note: New or remanufactured cylinder heads for most engines are generally available at auto supply stores. Since some special tools are required to perform...

Cleaning and checking the cylinder head
1. A thorough cleaning of the cylinder heads and valve parts followed by a detailed inspection will help to establish the amount of work required for the valve...

Valve Maintenance
1. Since valve servicing is a complex job and requires special tools and equipment, this job, commonly referred to as "valve rebuilding," should be performed...

Cylinder head assembly
1. Whether you have taken the cylinder head to a shop for a valve rebuild or not, make sure it is clean before reassembling. 2. If you have had the cylinder...

Removal and checking the camshaft, balance shaft and bearings
Note: Since there is not enough room in the vehicle's engine bay to remove the camshaft, the engine is removed from the vehicle and mounted on a stand for this...

Removal pistons and connecting rods
Note: Before removing the pistons and connecting rods, remove the cylinder heads, oil pan and oil pump following the instructions in the appropriate sections...

Removal the crankshaft
Note: The crankshaft can only be removed after the engine has been removed from the vehicle. It is further assumed that the flywheel, anti-vibration device,...

Cleaning the cylinder block
1. Remove the main bearing caps and remove the bearing shells from the caps and cylinder block. Label the bearings, indicating which cylinder they came from...

Checking the cylinder block
Note: The manufacturer recommends checking the bolt holes on the block for distortion, as well as the concentricity and alignment of the main bearing holes....

Cylinder honing
1. Before engine assembly, the cylinders must be honed to ensure the required piston ring fit and, accordingly, the best possible sealing of the combustion...

Checking pistons and connecting rods
1. Before starting the inspection, the pistons together with the connecting rods must be cleaned and the old rings removed from the pistons. Note: Always use...

Checking the crankshaft
1. Remove all burrs from the crankshaft oil holes using a block, file or scraper (see illustration). 19.1. The edges of the oil holes must be rounded off to...

Checking main bearings and upper connecting rod bearings
1. Although the main and connecting rod bearings should be replaced with new ones during an engine overhaul, the old bearings should be carefully inspected as...

Engine Overhaul — Assembly Sequence
1. Before you begin assembling the engine, make sure you have all the required new parts, gaskets and seals, as well as the following tools and materials:...

Installing piston rings
1. Before installing new piston rings, it is necessary to check the gaps in the ring lock. It is assumed that the clearances in the piston ring groove have...

Installing the crankshaft and checking the crankshaft main bearing clearance
1. Installing the crankshaft is the first step in engine assembly. It is assumed that at this point the cylinder block and crankshaft have been cleaned,...

Installation of camshaft and balance shaft
Camshaft 1. Lubricate the bearing journals and camshaft lobes with molybdenum-based grease or a special grease for camshaft parts (see illustration). 24.1. Be...

Replacing the rear crankshaft oil seal
1. Remove the engine with the gearbox and subframe and separate the engine from the gearbox (see section 5). 2. Remove the flywheel ( see section 27 ). 3....

Installing and checking oil clearances of the lower connecting rod head liners
1. Before installing the piston and connecting rod, the cylinder walls must be perfectly clean, the upper edge of each cylinder must have a chamfer (be...

Removal and installation the flywheel
1. Remove the engine with gearbox and subframe if this has not already been done ( see section 5 ). Separate the engine from the gearbox. 2. If the locating...

Initial start-up and running-in after major repairs
Caution: When starting the engine for the first time, have a fire extinguisher at hand. 1. Once the engine is installed in the vehicle, double check the oil...

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