How to install VQ35HR repair overhaul full set ?

Installing the VQ35HR engine repair kit is a complex and technically demanding task that involves multiple steps and precautions. The following are the main procedures and key points for installing the VQ35HR engine repair kit: 

I. Preparations Before Installation
1. **Understand the Contents of the Repair Kit**
The VQ35HR engine repair kit typically includes key parts such as cylinder head gaskets, seals, and oil seals. Repair kits for different vehicle models and engine types may vary, so it is essential to ensure that the selected repair kit matches the engine model.

2. **Preparation of Tools and Equipment**
Specialized tools such as torque wrenches, piston ring pliers, jacks, and cranes are required. Additionally, auxiliary materials like lubricating oil and sealant should also be prepared.

3. **Cleaning Engine Components**
Before installation, all engine components must be thoroughly cleaned to ensure there is no dirt or oil residue, which could affect the sealing performance.

1. **Installation of the Crankshaft**
- Apply lubricating oil to the surface of the crankshaft bearings to ensure lubrication and sealing effects.
- Use a torque wrench to gradually tighten the main bearing cap bolts in a diagonal sequence to avoid deformation caused by uneven force.

2. **Installation of Piston and Connecting Rod**
- Install the piston rings into the piston ring grooves, paying attention to the opening clearance and direction of the piston rings. Ensure that the ports of the three piston rings are staggered by 120°.
- Use a special tool to push the piston into the cylinder, making sure that the marks on the piston and connecting rod face the front of the engine.
- Install the connecting rod cap and tighten the connecting rod bolts to the specified torque.

3. **Installation of the Cylinder Head**
- Place the cylinder gasket, ensuring its correct orientation, and use a torque wrench to gradually tighten the cylinder head bolts in a diagonal sequence.
- Install the valves, valve springs, and other components, ensuring that the valve oil seals are properly installed and lubricated with oil.

4. **Installation of Camshaft and Timing Chain**
- Before installing the camshaft, clean and lubricate the camshaft bearings and hydraulic tappets.
- Align the timing marks and install the timing chain to ensure the synchronization of the camshaft, crankshaft, and variable valve timing system.

5. **Installation of Other Accessories**
- Install the intake manifold, exhaust manifold, ignition coils and other accessories, ensuring that all pipelines and wiring are correctly connected.
- Install the oil pan and oil pump, making sure that the gaskets and bolts are tightened properly.

III. Inspection and Testing After Installation
1. **Check Sealing Performance**
Ensure that all seals are installed correctly and there is no oil or gas leakage.

2. **Test Engine Operation**
Reconnect the battery, start the engine, check for any abnormal noises or vibrations, and test the idle speed and acceleration performance.

3. **Complete Relevant Procedures**
If the engine needs to be replaced, you should go to the local vehicle administration office to handle the relevant procedures, including updating the vehicle registration certificate and the engine number.

IV. Precautions
- **Operate strictly in accordance with the manufacturer's instructions**: This includes tightening the bolts to the specified torque and aligning the timing marks, to prevent engine damage due to improper operation.
- **Use high-quality parts**: Ensure that the parts in the repair kit are of reliable quality to avoid affecting the engine's lifespan and performance.
- **It is recommended to have a professional technician perform the operation**: If you lack experience, it is advisable to have a professional technician install it to avoid unnecessary losses.

Through the above steps, the installation of the VQ35HR engine repair kit can be completed. For more detailed operation guidelines, you can refer to the relevant technical documents or consult professional maintenance personnel.