B ... and remove the collets as described

5Compress the valve spring on the first valve with a spring compressor, making sure it is correctly located onto each end of the valve assembly (see illustration).Do not compress the springs any more than is absolutely necessary and take care not to mark the surface of the cam follower hole with the spring compressor. Remove the collets, using either needle-nose pliers, tweezers, a magnet or a screwdriver with a dab of grease on it (see illustration).Carefully release the valve spring compressor and remove the spring retainer, noting which way up it fits, the spring, the spring seat, and the valve from the head (see illustrations).If the valve binds in the guide (won't pull through), push it back

2»18 Engine, clutch and transmission

I2.5e... and the valve spring seat

into the head and deburr the area around the collet groove with a very fine file or whetstone (see illustration).

6Repeat the procedure for the remaining valves. Remember to keep the parts for each valve together and separate from the other valves so they can be reinstalled in the same location.

7 Once the valves have been removed and labelled, pull the valve stem seals off the top of the valve guides with pliers and discard them (see illustration).The old seals should not be reused.

8 Next, clean the cylinder head with solvent and dry it thoroughly. Compressed air will speed the drying process and ensure that all holes and recessed areas are clean.

9 Clean all the valve springs, collets, retainers and spring seats with solvent and dry them

thoroughly. Clean the parts from one valve at a time so that no mixing of parts between valves occurs.

10 Scrape off any deposits that may have
formed on the valve, then use a motorised
wire brush to remove deposits from the valve
heads and stems. Again, make sure the valves
do not get mixed up.