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Car engine overhaul Toyota 4Runner 2 (N120)
This subsection discusses in detail the procedure for performing such work as dismantling the power unit from the vehicle and overhauling the cylinder head, cylinder block/crankcase, and other engine parts.
Advice is given on the preparation and organization of work on overhaul and the purchase of spare parts, the procedures for removing, checking the technical condition, repairing and installing engine components and parts are described in detail.
Starting from the next section, the description is based on the assumption that the engine has been removed from the vehicle. A description of the types of repairs without removing the engine from the car is given in subsection 3.1.2 and subsection 3.2.2.
At the beginning of the subsection, all the regulatory data necessary for checking the technical condition and overhaul are given, the procedures for which are described below. See section 3.1.1 and subsection 3.2.1.
Technical data of engine overhaul
4-cylinder engines 2.4 and 2.7 l All dimensions and clearances are in mm. Compression (at 250 rpm): - standard 11.7 kgf/cm² - the limit 8.4 kgf/cm² – the greatest difference in compression in the cylinders 1.9 kgf/cm²...
4-cylinder engines 2.4 and 2.7 l All dimensions and clearances are in mm. Compression (at 250 rpm): - standard 11.7 kgf/cm² - the limit 8.4 kgf/cm² – the greatest difference in compression in the cylinders 1.9 kgf/cm²...
Engine Overhaul — General Information
Connecting the control pressure gauge 4-cylinder engines V6 3.0L Engines V6 3.4L Engines It is not always easy to come to a conclusion about the advisability of a complete engine overhaul, since it is necessary to rely...
Connecting the control pressure gauge 4-cylinder engines V6 3.0L Engines V6 3.4L Engines It is not always easy to come to a conclusion about the advisability of a complete engine overhaul, since it is necessary to rely...
Alternatives to Engine Overhaul
When performing a major overhaul on your own, there are various options. The decision to replace the cylinder block, connecting rod and piston group, and crankshaft depends on a number of factors, the most important of...
When performing a major overhaul on your own, there are various options. The decision to replace the cylinder block, connecting rod and piston group, and crankshaft depends on a number of factors, the most important of...
Engine disassembly procedure
Crank mechanism and piston group of 4-cylinder engines 1. Upper compression ring; 2. Oil scraper ring discs; 3. Flywheel; 4. Bolt; 5. Connecting rod; 6. Connecting rod bearings; 7. Connecting rod cap; 8. Seal; 9....
Crank mechanism and piston group of 4-cylinder engines 1. Upper compression ring; 2. Oil scraper ring discs; 3. Flywheel; 4. Bolt; 5. Connecting rod; 6. Connecting rod bearings; 7. Connecting rod cap; 8. Seal; 9....
Engine diagnostics using a vacuum gauge
Measuring vacuum is a reliable and relatively cheap way to diagnose an engine. The vacuum gauge readings can provide information on the condition of the piston group, the tightness of the cylinder head gaskets, the...
Measuring vacuum is a reliable and relatively cheap way to diagnose an engine. The vacuum gauge readings can provide information on the condition of the piston group, the tightness of the cylinder head gaskets, the...
Checking the compression in the engine cylinders
The results of the compression test in the engine cylinders allow us to judge the condition of a group of parts in the upper part of the engine (pistons, rings, valves and cylinder head gaskets). Namely, a decrease in...
The results of the compression test in the engine cylinders allow us to judge the condition of a group of parts in the upper part of the engine (pistons, rings, valves and cylinder head gaskets). Namely, a decrease in...
Dismantling the power unit — preparatory activities
If a decision has been made to dismantle the engine for major repairs or repairs of the main components, then certain preparatory measures must be carried out. It is extremely important to mark the place where the work...
If a decision has been made to dismantle the engine for major repairs or repairs of the main components, then certain preparatory measures must be carried out. It is extremely important to mark the place where the work...
Methods and safety precautions for engine dismantling
If a decision has been made to dismantle the engine for major repairs or repairs of the main components, then certain preparatory measures must be carried out. It is extremely important to mark the place where the work...
If a decision has been made to dismantle the engine for major repairs or repairs of the main components, then certain preparatory measures must be carried out. It is extremely important to mark the place where the work...
Dismantling and installing the engine
Attention! Before performing work, read the contents of this subsection. The manufacturer recommends dismantling the engine assembly with the transmission by lifting the entire power unit up and removing it from the...
Attention! Before performing work, read the contents of this subsection. The manufacturer recommends dismantling the engine assembly with the transmission by lifting the entire power unit up and removing it from the...
Disassembling the cylinder head
Attention! It seems more expedient to purchase a new cylinder head than to disassemble, check and repair a previously used head. Sorting of valve mechanism parts Removed parts should be stored in the order they were...
Attention! It seems more expedient to purchase a new cylinder head than to disassemble, check and repair a previously used head. Sorting of valve mechanism parts Removed parts should be stored in the order they were...
Cleaning and checking the cylinder head
Valve wear check locations 1. End face; 2. Grooves for crackers; 3. Rod; 4. Chamfer; 5. Inlet valve; 6. Belt; 7. Exhaust valve Typical wear of the valve end Cleaning 1. Remove all gasket residue from the head split...
Valve wear check locations 1. End face; 2. Grooves for crackers; 3. Rod; 4. Chamfer; 5. Inlet valve; 6. Belt; 7. Exhaust valve Typical wear of the valve end Cleaning 1. Remove all gasket residue from the head split...
Cylinder head assembly
Before starting assembly, it is necessary to make sure that the cylinder head is clean, regardless of whether this part was repaired in a car service or not. 1. If the cylinder head was repaired in a car service, then...
Before starting assembly, it is necessary to make sure that the cylinder head is clean, regardless of whether this part was repaired in a car service or not. 1. If the cylinder head was repaired in a car service, then...
Valves — Checking and Repairing
Due to the complexity of the work and the need to use special tools and equipment, it is recommended that repairs to valves, seats and guide bushings be performed at a car service center. It is advisable to perform only...
Due to the complexity of the work and the need to use special tools and equipment, it is recommended that repairs to valves, seats and guide bushings be performed at a car service center. It is advisable to perform only...
Connecting rod and piston group — dismantling
Caution: Before removing the pistons and connecting rods, remove the cylinder head, oil pan and oil pump. Dismantling 1. On 2.7L engines, remove the balance shaft (see subsection 3.3.14 ). 2. Use a reamer to remove the...
Caution: Before removing the pistons and connecting rods, remove the cylinder head, oil pan and oil pump. Dismantling 1. On 2.7L engines, remove the balance shaft (see subsection 3.3.14 ). 2. Use a reamer to remove the...
Removal the crankshaft
Attention! The crankshaft can only be removed after the engine has been removed from the vehicle. Remove the flywheel first (or leading disk), tensioner pulley, belt (chain), sump, oil receiver, oil pump, front cover...
Attention! The crankshaft can only be removed after the engine has been removed from the vehicle. Remove the flywheel first (or leading disk), tensioner pulley, belt (chain), sump, oil receiver, oil pump, front cover...
Checking the condition of the crankshaft
1. Wash the crankshaft with solvent and dry, clean the oil passages, clean the journals and remove burrs. 2. Check the condition of the journals, presence of cracks, dents, burrs. Check the roughness of the journals by...
1. Wash the crankshaft with solvent and dry, clean the oil passages, clean the journals and remove burrs. 2. Check the condition of the journals, presence of cracks, dents, burrs. Check the roughness of the journals by...
Installation and checking of clearances in crankshaft main bearings
Tightening Sequence for Main Bearing Cap Bolts on 4-Cylinder Engines Main Bearing Cap Bolt Tightening Sequence for V6 Engines 1. Position the block so that the bottom is facing up. Unscrew the cap bolts, remove the caps...
Tightening Sequence for Main Bearing Cap Bolts on 4-Cylinder Engines Main Bearing Cap Bolt Tightening Sequence for V6 Engines 1. Position the block so that the bottom is facing up. Unscrew the cap bolts, remove the caps...
Cylinder Block — Cleaning and Checking
Cleaning Attention! The cooling system channel plugs are tightly pressed into the cylinder block. 1. Turn the plugs by hitting the blunt part of the core (photo on the left) and take it out with pliers (photo on the...
Cleaning Attention! The cooling system channel plugs are tightly pressed into the cylinder block. 1. Turn the plugs by hitting the blunt part of the core (photo on the left) and take it out with pliers (photo on the...
Cylinder honing
For honing it is recommended to use a "brush" device. 1. Clamp the fixture into the electric drill. 2. Lubricate the cylinder surface well with oil, turn on the electric drill and periodically move it up and down in the...
For honing it is recommended to use a "brush" device. 1. Clamp the fixture into the electric drill. 2. Lubricate the cylinder surface well with oil, turn on the electric drill and periodically move it up and down in the...
Checking the condition of connecting rods and pistons
1. Carefully clean the pistons from carbon deposits and carefully remove the rings. 2. Remove carbon deposits from piston ring grooves using a tool (photo on the left) or an old piston ring (photo on the right). 3. Wash...
1. Carefully clean the pistons from carbon deposits and carefully remove the rings. 2. Remove carbon deposits from piston ring grooves using a tool (photo on the left) or an old piston ring (photo on the right). 3. Wash...
Installing and checking clearances in connecting rod bearings
Piston ring joint arrangement 1. Upper compression ring; 2. Oil scraper ring expander; 3. Lower compression ring; 4. Upper disc of oil scraper ring; 5. Notches (facing the front of the engine); 6. Lower disc of oil...
Piston ring joint arrangement 1. Upper compression ring; 2. Oil scraper ring expander; 3. Lower compression ring; 4. Upper disc of oil scraper ring; 5. Notches (facing the front of the engine); 6. Lower disc of oil...
Main and connecting rod bearings — inspection and selection
Types of wear of main and connecting rod bearings Examination Main and connecting rod bearings must be replaced during a major engine overhaul, but previously used bearings should be carefully checked to restore the...
Types of wear of main and connecting rod bearings Examination Main and connecting rod bearings must be replaced during a major engine overhaul, but previously used bearings should be carefully checked to restore the...
Balance shafts — removal, inspection and installation
Balance shafts (on 2.7 l engines) are installed on both sides of the cylinder block and are driven by a separate chain (see Fig. Front engine parts ). Removal 1. Remove the N1 chain tensioner, guide, N1 sprocket and...
Balance shafts (on 2.7 l engines) are installed on both sides of the cylinder block and are driven by a separate chain (see Fig. Front engine parts ). Removal 1. Remove the N1 chain tensioner, guide, N1 sprocket and...
Engine assembly procedure
On 4-cylinder engines: piston rings; crankshaft and main bearings; pistons with connecting rods; rear crankshaft oil seal; cylinder head; camshafts; balance shafts; chain; oil pump; oil receiver; pallet; collectors;...
On 4-cylinder engines: piston rings; crankshaft and main bearings; pistons with connecting rods; rear crankshaft oil seal; cylinder head; camshafts; balance shafts; chain; oil pump; oil receiver; pallet; collectors;...
Installing piston rings
Installation of compression rings There are marks on the rings (1(2)T or 1(2)N for 4-cylinder engines and 1(2)R or T1 (t2) for V6). Installation 1. Before installing new piston rings, sort the rings and check the joint...
Installation of compression rings There are marks on the rings (1(2)T or 1(2)N for 4-cylinder engines and 1(2)R or T1 (t2) for V6). Installation 1. Before installing new piston rings, sort the rings and check the joint...
Starting the engine after repair and running-in
1. After completing assembly, double check the oil and coolant levels. 2. With the spark plugs removed and the ignition system and fuel pump disconnected, turn the crankshaft until the oil pressure is registered by the...
1. After completing assembly, double check the oil and coolant levels. 2. With the spark plugs removed and the ignition system and fuel pump disconnected, turn the crankshaft until the oil pressure is registered by the...
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- General information
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- 4-cylinder engines
- 6-cylinder engines
- Engine overhaul
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