Apply grinding compound very

Sparingly, in small dabs, to the valve face

Only

A Rotate the valve grinding tool back

And forth between the palms of your

hands

B The valve face and seat should show a uniform unbroken ring ...

C ... and the seat (arrowed) should

Be the specified width all the

Way round

2«20 Engine, clutch and transmission

12.25a Use a small screwdriver to locate a new valve stem seal onto the guide ...

B ... then press the seal into position with a suitable deep socket

Lubricate the stem and slide the valve into its correct location

A A small dab of grease will keep the

Collets in place on the valve during

reassembly

seal onto the guide (see illustration).Use an appropriate size deep socket to push the seal over the end of the valve guide until it is felt to clip into place (see illustration).Don't twist or cock it, or it will not seal properly against the valve stem. Also, don't remove it again or it will be damaged.

26Coat the valve stem with molybdenum disulphide grease, then install it into its guide, rotating it slowly to avoid damaging the seal (see illustration).Check that the valve moves up and down freely in the guide. Next, fit the spring onto the spring seat with its closer-wound coils facing down into the cylinder

B Compress the springs and install

The collets, making sure they locate in the

Groove

head, then fit the spring retainer, with its shouldered side facing down so that it fits into the top of the spring,

27Apply a small amount of grease to the collets to help hold them in place (see illustration).Compress the spring with the valve spring compressor and install the collets (see illustration).When compressing the spring, depress it only as far as is absolutely necessary to slip the collets into place. Make certain that the collets are securely locked in the retaining groove.

28 Repeat 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.

29Support the cylinder head on blocks so the valves can't contact the workbench top,

then very gently tap each of the valve stems with a soft-faced punch (see illustration).This will help seat the collets in their grooves.

Check for proper sealing of I the valves by pouring a small JHlNTl amount of solvent into each

Date: 2016-01-14; view: 985