Disassembling the cylinder head and valves (Nissan Primera P10)

Both engines described in this manual have a cylinder head with camshafts installed in it, but this is where the similarities end. Therefore, the work is described separately. Injection engines use levers that rest on hydraulic tappets to compensate for valve clearances. In a carburetor engine, the cams of both camshafts act directly on inverted hollow cylindrical tappets. The camshaft supports are also different.

Injection engines

Remove the valve levers, compensating washers, lever guides and hydraulic compensators as shown in the illustration below.







1. On the SR20Di engine, remove the EGR valve line.

Text duplicated from the website [NISSANBOOK.ru]

2. Unscrew the heat shield from the exhaust manifold and loosen the manifold fastening. Loosen starting from the outside to the inside.

3. On the SR20DE engine, unscrew the fuel lines.

4. Loosen the intake manifold starting from the outside to the inside. On the SE20DE engine, unscrew the line from the intake manifold.

5. Unscrew the water outlet pipe and the thermostat housing together with the water tube.

6. Remove the valves. To do this, compress the valve springs with a valve spring compressor. The illustration shows a valve spring compressor suitable for this engine. Remove the valve keepers, spring cup, and valve spring. If you do not have a valve spring compressor, place a wooden block in the combustion chamber under the valve plate and place a length of pipe on top of the valve plate. Hit the pipe with a hammer, which will cause the valve keepers to pop out of their grooves and remain inside the pipe.



7. Remove the valve stem seals from the valves using pliers. The seals should always be replaced illustrations the individual elements of the cylinder head are shown with the arrangement of individual parts. The second camshaft rests on the same elements, however, one of the end caps is larger.

Carburetor engine

The cylinder head of a carburetor engine is already disassembled to some extent into individual elements when removed, i.e. only the valves remain in the cylinder head. They are removed in the same way as described above. Take out the tappets and tappet adjusting washers and connect according to the valve number. The camshaft supports of this engine are shown in the illustration below.