PZ12V190B cylinder head 12VB.03.00 jinan diesel engine

Pictures of PZ12V190B CYLINDER HEAR 12VB.03.00

Jichai 12V190 Diesel Engine Cylinder Head Assembly Tips

After all Jichai 12V190 cylinder head components have been cleaned and inspected to meet quality standards—especially ensuring the valve and valve seat fit properly—assembly can proceed. The following precautions must be observed:

1. Proper Valve Assembly

When installing the valve components, ensure that each valve is installed according to its designated position based on the assembly markings.

Do not interchange valve components.

The valve spring must be installed with the end having smaller coil spacing facing downward.

2. Rocker Arm Bushing Replacement

Use the cold installation method when replacing the rocker arm bushing.

Do not forcefully hammer the bushing into place.

Ensure that the oil hole on the bushing aligns with the oil hole on the rocker arm.

3. Injector Sleeve Installation and Sealing Test

Before installing the injector sleeve, apply sealant to the upper and lower sealing surfaces and then press it into the seat hole.

After installation, conduct a seal pressure test:

Inject cooling water at a pressure of 392 kPa into the cylinder head cooling chamber.

Maintain pressure for 5 minutes to check for leaks.

Pay special attention to sealing at the upper and lower surfaces of the injector sleeve, the air passage surface, and the outer sealing plugs.

4. Injector Installation and Adjustment

Install the injector with its original gasket.

After installation, measure the injector tip protrusion (C) from the bottom surface of the cylinder head, which should be between 2.4 to 3 mm.

Adjust the protrusion height by modifying the thickness of gasket 3 if necessary.

5. Cylinder Head Installation on the Engine Block

Before mounting the cylinder head onto the engine block, carefully inspect the following components to ensure they are properly installed:

Jichai water crossover pipe

Jichai 190 throttle valve

Tappet bore bushings

Combination sealing gaskets

Cylinder head gasket

Following these assembly precautions will ensure a properly sealed, well-functioning cylinder head, preventing operational failures and extending the engine's service life.