MG/Ruian (SAIC BlueCore Series) Engine Assembly Graphic Installation Procedure
Core Explanation: Both models belong to the SAIC Blue Core platform. The installation process of the engine assembly is 90% common, with only minor differences in the specific wiring route of the vehicle, the attachment fixation points, and the specifications of the bracket rubber sleeves. All the procedures require the use of SAIC's dedicated tools and strictly follow the torque standards in the corresponding vehicle maintenance manual. It is recommended that certified technicians perform the installation. Before installation, it is necessary to mark the components and disconnect the power supply and fuel supply.
Compatible Models: MG5/MG6/MG7, RX i5/i6/ei6/iMAX8, etc. of mainstream Blue Core SGE 1.5T/1.3T, MGE 2.0T series engines
Preparation Stage (Safety First, Foundation Establishment)
Tools/Materials Preparation
Special Tools: Engine hoist, engine support frame, torque wrench (accurate to 1 N·m), universal joint sleeve, wire harness disassembler, oil pipe clamping device
Supplies: New engine foot pad (rubber sleeve), heat-resistant sealant, engine oil/coolant/transmission oil, various sealing rings/pads (intake/exhaust/oil pan/pipe), thread locking agent
Auxiliary: Marker pen, electrical tape, cable ties, oil collection basin, absorbent cloth, vehicle lift
Vehicle Preprocessing (Illustration: The vehicle is parked on the lift, the negative terminal of the battery is disconnected, the engine hood is opened, and the surrounding is well protected)
1. Park the vehicle on a horizontal lift, apply the handbrake, shift to P (automatic transmission) or N (manual transmission), and fix the front and rear wheels with triangular blocks;
2. Open the engine hood, cover the fenders and front bumper with protective cloth to prevent scratches;
3. Disconnect the negative terminal of the battery (first remove the negative terminal to avoid short circuit), wrap the connection head with electrical tape, and mark it;
4. Raise the vehicle to a half-lift position (30 cm off the ground), use the oil collection basin to drain the engine oil (remove the oil drain screw of the oil pan), coolant (remove the lower water pipe of the water tank), and transmission oil (for manual, remove the oil drain screw; for automatic, remove the oil level screw), then reset the drain screws and wipe off the residual oil;
5. Lower the vehicle, remove the engine compartment cover and air filter assembly (including intake pipe), exposing the engine body.
First Stage: Removing the Surrounding Connectors of the Engine (Illustration: The engine body is exposed, the pipes/wire harnesses have been marked, the attachments are placed in order)
Core Requirements: All plugs, pipes, and wire harnesses are marked with numbers (e.g., "Intake Pressure Sensor - 1", "Left Water Tank Upper Pipe"), the removed bolts/nuts are grouped by "location" and placed in a storage box with markings to avoid mixed placement.
1. Fuel System Removal: Use the oil pipe clamping device to clamp the fuel inlet/outlet pipes, remove the fuel pump plug, remove the fuel guide rail fixing bolts, gently remove the guide rail (with the fuel injector), wrap the fuel injector interface with cling film to prevent dust entry;
2. Cooling System Removal: Remove the water tank upper/lower pipes, warm water pipes, thermostat inlet/outlet pipes, remove the connecting pipe of the auxiliary water tank, remove the auxiliary water tank; remove the engine water temperature sensor, thermostat plug;
3. Electrical System Removal: Remove the engine ECU wire harness total plug (located on the side panel of the engine compartment), remove the camshaft position sensor, crankshaft position sensor, oxygen sensor, ignition coil, fuel injector, oil pressure sensor, etc. from all plugs; remove the engine ground wire, generator/starting motor power wire, organize the wire harness and tie it up to avoid pulling;
4. Intake and Exhaust System Removal: Remove the intake manifold fixing bolts (from both ends to the middle to prevent deformation), remove the intake manifold; remove the exhaust manifold and three-way catalytic converter connection bolts, remove the exhaust manifold (with gasket), pack the gasket with a sealing bag; 5. Disassembly of transmission/attachment system: Remove the fixing bolts of the generator, air conditioning compressor, and power assist pump (for hydraulic-assisted models), remove the pulley and transmission belt, and tidy up the accessory pipelines (air conditioning pipes/assist oil pipes). Securely fix them on the side of the engine compartment with cable ties to avoid stress; Remove the fixing bolts of the starter and take it off.
6. Removal of other accessories: Remove the engine oil dipstick, oil filter, and water pump connection pipe; Remove the engine support and guard plates and wire harness fasteners that interfere with the engine in the engine compartment.
Second stage: Engine assembly and transmission separation + lifting and removal (Figure 1: The crane is hung on the engine hanger, and the bolts have been loosened; Figure 2: The engine is separated from the transmission, and the crane lifts slowly; Figure 3: The engine is placed on the dedicated support frame)
Core requirements: Before lifting, confirm that the hanger is firmly fixed, lift slowly and evenly to prevent the engine from shaking and scraping the engine compartment components; Mark the positioning points when separating the transmission to avoid misalignment of the clutch/hydraulic torque converter.
1. Install the dedicated crane: Fix the engine dedicated hanger on the reserved hanger points on both sides of the engine cylinder cover (tighten the bolts, apply a small amount of thread locking agent), connect the crane hook to the hanger, slowly pull tight the crane steel wire rope, so that the crane bears part of the weight of the engine;
2. Remove engine support: Remove the left/right suspension support of the engine, the rear suspension support, and the connection bolts between the engine and the vehicle/body/fork frame successively, remove the fixing bolts between the transmission and the engine (mark the position of the bolts, place different specifications bolts separately);
3. Separate engine and transmission: Manually push the engine to separate the flywheel from the transmission clutch/hydraulic torque converter, confirm that there are no connecting components, then operate the crane to lift the engine slowly vertically upwards, and have someone assist in stabilizing it to avoid scraping between the engine and the transmission, engine compartment components;
4. Place the engine on the ground: Slowly move the crane to an open area, place the engine on the dedicated engine support frame, tighten the support frame fixing bolts, keep the engine in a horizontal state, and remove the crane hanger.
Third stage: Pre-treatment of new/repaired engine assembly + engine compartment cleaning (Figure 1: The engine is pre-treated on the support frame, wiping the interfaces; Figure 2: Cleaning the accumulated dirt in the engine compartment, inspecting the support rubber sleeves)
Core requirements: Before installation, conduct a comprehensive cleaning and inspection of the engine assembly and the engine compartment connection surfaces, replace aging and wear-prone parts to avoid problems such as oil leakage, abnormal noise, and loose connections after installation.
1. Engine assembly pre-treatment
- Wipe the anti-rust oil and dust on the connection surfaces of the engine cylinder, cylinder cover, flywheel housing, etc., ensure the connection surfaces are smooth and free of impurities;
- Check the sealing rings of each interface (inlet and exhaust/pipe/water pipe) of the engine to ensure they are intact, replace if damaged;
- Apply a small amount of lubricating grease on the positioning pins of the flywheel and transmission clutch, and apply a small amount of anti-rust agent in the installation holes of the engine support;
- For new engine assemblies, add a small amount of engine oil (oil passage) before rotating the crankshaft pulley to ensure the oil pump works normally.
2. Engine compartment cleaning and inspection
- Wipe the accumulated dirt and oil on the engine support, fork frame, and transmission connection surfaces of the engine compartment, gently sand the rusty bolt holes with sandpaper to ensure the bolts can be tightened smoothly;
- Check if the engine suspension support and fork frame on the vehicle side are deformed, check if the rubber sleeves (foot pads) of the support are aging and cracked, replace all new rubber sleeves (key wear parts to avoid later abnormal noise);
- Check if the wiring, pipes in the engine compartment are aging or damaged, repair or replace the damaged parts, and tidy up the wire harness fasteners.
3. Transmission pre-treatment: Check if the clutch (manual transmission) / hydraulic torque converter (automatic transmission) is in good condition, apply a small amount of high-temperature lubricating grease on the surface of the clutch pressure plate, confirm the accurate position of the positioning pins, and there is no offset. Phase 4: Installation of engine assembly into the compartment and connection with the gearbox (Illustration 1: The crane lifts the engine into the compartment and aligns precisely; Illustration 2: The engine and gearbox are initially connected, and the positioning bolts are tightened)
Key requirements: The alignment and lifting must be precise to avoid damaging the positioning pins and bolt holes during forced connection; After initially tightening the bolts, confirm that the engine and gearbox are not misaligned and that the flywheel and clutch/hydraulic torque converter are tightly attached.
1. Reinstall the lifting ears: Fix the dedicated lifting ears again at the new engine cylinder head lifting point, connect the crane hook to the lifting ears, and pull tight the steel wire rope to keep the engine in a horizontal state;
2. Precise lifting into the compartment: Operate the crane to slowly move the engine above the compartment, adjust the crane height and angle to make the flywheel housing of the engine and the input shaft end of the gearbox precisely aligned (align with the positioning pins), slowly lower the engine, and ensure that the positioning pins smoothly insert into the positioning holes of the gearbox;
3. Preliminary fixation of gearbox connection bolts: When the engine and gearbox are tightly attached, first tighten 2-3 bolts of the gearbox and the engine (torque is tightened diagonally, temporarily at 50% of the standard value), confirm that there is no misalignment or shaking, and then remove the crane lifting ears;
4. Temporary fixation of engine support: Connect the left/right/after suspension supports of the engine to the body/auxiliary frame initially, tighten 1-2 bolts, to keep the engine stable and avoid shaking during subsequent installation of accessories.
Phase 5: Reinstallation of core components (Illustration: The engine and gearbox are fixed, and the supports, generator, air conditioning compressor, etc. are reinstalled in sequence)
Key requirements: All bolts should be tightened according to the diagonal principle, strictly following the torque standards in the maintenance manual (such as cylinder head bolts 80-90 N·m, support bolts 50-60 N·m), key bolts should be coated with thread locking agent to avoid loosening.
1. Tightening the engine and gearbox: Tighten all the connection bolts between the gearbox and the engine in a diagonal sequence, reach the standard torque, and apply thread locking agent (such as flywheel housing bolts);
2. Installing the engine suspension supports: Tighten the left/right/after suspension supports to the engine, body/auxiliary frame, connection bolts in a sequence, reach the standard torque, confirm that the engine installation is without deviation or shaking, and the rubber sleeves of the supports are not compressed;
3. Reinstalling transmission accessories: Install the generator, air conditioning compressor, assist pump, apply transmission belts, adjust the belt tension (press the middle of the belt, the deflection is 10-15mm is appropriate), tighten the accessory fixing bolts;
4. Reinstalling the starter: Install the starter in the reserved position of the flywheel housing, tighten the fixing bolts, connect the starter power cord and plug, do insulation treatment;
5. Reinstalling the intake and exhaust system: Apply high-temperature resistant sealant on the connection surface of the intake manifold and cylinder head, place the new gasket, connect the intake manifold bolts in a diagonal sequence; Place the metal gasket on the connection surface of the exhaust manifold and cylinder head, tighten the exhaust manifold bolts, connect the exhaust manifold to the three-way catalytic converter;
6. Reinstalling the oil filter + oil dipstick: Install the new oil filter (tighten again and then turn back 1/4 turn), insert the oil dipstick, confirm the installation is in place.
Phase 6: Reinstallation of pipes/liners/fuel system (Illustration 1: All pipes are precisely connected and fixed by snap fasteners; Illustration 2: Connect the liners according to the markings, use cable ties to organize and fix)
Key requirements: Reinstall according to the previous markings one-to-one, all pipes should be tightly plugged and fixed, the liners should avoid interfering with high-temperature components (such as exhaust manifold) and moving parts (such as pulley), and do heat insulation and wear protection. 2. Fuel System Reinstallation: Install the fuel guide (with fuel injectors) onto the intake manifold, tighten the fixing bolts, connect the fuel inlet/outlet pipes, remove the pipe clamps, and check if the fuel pipe interfaces are sealed properly; connect the fuel pump plug;
3. Electrical System Reinstallation: Insert all plugs (such as camshaft position sensor, crankshaft position sensor, oxygen sensor, ignition coil, fuel injectors, water temperature sensor, etc.) in sequence according to the markings, ensuring they are properly inserted (with snap fasteners tightened); connect the engine ECU wiring harness, tighten the plug fixing snap fasteners; reinstall the engine ground wire to ensure good contact;
4. Wiring Stripping: Use cable ties to fix the engine wiring harness on the reserved card slots in the engine compartment, keeping the wiring at least 5cm away from high-temperature components (exhaust manifold, turbocharger), and wrap anti-wear tape at the contact points between the wiring and metal components;
5. Reinstalling Air Filter Assembly: Install the intake hose, fix the air filter housing, and tighten the fixing bolts.
The Seventh Phase: Oil Fluid Addition + Self-Check and Debugging (Figure 1: Add engine oil/coolant, check oil level/liquid level; Figure 2: Start the engine, check for oil leakage/water leakage, listen for abnormal engine sounds)
Core Requirements: Follow the vehicle model manual for the amount of oil fluid addition, conduct a comprehensive self-check before starting, observe the idle condition after starting, check for oil leakage, water leakage, abnormal sounds, and alarms, and proceed with the road test only if there are no abnormalities.
Step 1: Oil Fluid Addition
1. Add engine oil: Add the corresponding specification engine oil (such as 5W-30 synthetic) according to the vehicle model manual, wait for 5 minutes after adding, remove the oil dipstick, and confirm that the oil level is between "MIN" and "MAX";
2. Add coolant: Add ethylene glycol-based coolant (mix water according to the engine compartment markings), until the secondary water tank reaches the "MAX" scale, and tighten the secondary water tank cap;
3. Add transmission oil: Manually add to the oil filler port until it overflows, and automatically add according to the vehicle model manual. Check if the oil level is normal;
4. Check other fluids: Add power assist fluid (hydraulic assist vehicle models) and air conditioning refrigerant (if the piping is removed).
Step 2: Pre-Start Self-Check
1. Recheck all pipes, wiring harnesses, and bolts for proper connection, and ensure no missing components;
2. Remove the electrical tape from the negative terminal of the battery, reconnect the battery negative terminal connector, and tighten the fixing bolts;
3. Insert the car key, turn it to the ON position (do not start), wait for the dashboard self-check, and check if there are any constantly illuminated engine fault lights, battery lights, oil pressure lights, etc. If not, proceed to the next step.
Step 3: Engine Start Debugging
1. Turn the car key to start the engine, idle for 3-5 minutes (cold engine idle approximately 1000-1200 r/min, after heating, it drops to 700-800 r/min);
2. Observe the engine operation: Check for abnormal sounds (such as metal knocking, belt abnormal sounds), vibration, and whether there are fault lights on the dashboard;
3. Check for leaks: Open the engine compartment, check for leaks at the oil filter, oil pan, intake and exhaust interfaces, water pipes, and wiring; lift the vehicle to check for leaks at the engine bottom and transmission connection points;
4. Check accessory operation: Turn on the air conditioning to confirm that the air conditioning compressor is working normally; gently step on the accelerator to observe if the engine speed rises steadily without delay or abnormal sounds;
5. Recheck after warm-up: After the engine is warm (water temperature reaches 90°C), recheck the coolant level and oil level, and add to the normal scale; check the belt tension, and adjust if necessary.
The Eighth Phase: Road Test + Final Recheck (Figure: Vehicle road test, after returning, lift the vehicle for a comprehensive recheck) 1. Road test requirements: Select an open road and conduct low-speed (20-40 km/h), medium-speed (40-60 km/h), and high-speed (60-80 km/h) driving. Test whether the engine acceleration, gear shifting (automatic/ manual) is smooth, and whether there are abnormal noises, vibrations, or fault lights. Also, check if the brakes and steering are normal.
2. Final re-inspection after return: Drive the vehicle back to the lift, lift the vehicle, and check again under idle operation whether there is any leakage at all connection parts of the engine, whether the engine bracket and transmission connection bolts are loose; check if the exhaust pipe has abnormal noises or leaks.
3. Reset components: Install the engine compartment cover and engine lower guard plate, remove the fender and bumper protection cloth, clean the residual oil and debris in the engine compartment.
4. Fault
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Post time: Feb-01-2026