Cylinder Head Service - Toro Workman 3000 Series Service Manual

Cylinder Head Service

1. Use a valve lifter tool to compress the valve spring
(Fig. 61). To remove each valve retainer, depress the
retainer against the valve spring and remove the re ­
tainer lock (Fig. 62). Remove the valve retainer, spring
and valve. Keep each valve and other parts for each
cylinder separate so they can be reinstalled in the same
cylinder.
2. Examine each valve for burning, pitting, heavy carbon
deposits or wear. The condition of the valves can give
important information about other components that may
require service (example: improper valve clearance,
worn valve guides, damaged seals, etc.). Remove the
valve seals.
3. Inspect the cylinder head for coolant leaks or damage
before cleaning.
4. Remove all of the carbon deposits from the combus­
tion chamber using a scraper and wire brush.
5. Clean the cylinder head thoroughly with solvent or
degreasing solution and allow it to dry. Inspect carefully
for cracks.
6. Remove all carbon deposits from the valve guide
bores with a valve guide cleaner. Use a valve guide
bristle brush to remove loosened carbon deposits in the
valve guide. Push a solvent soaked cloth through the
valve guides to remove all foreign material.
7. Use compressed air to clean out the oil passages.
Make sure the oil passages are not plugged.
CAUTION
Warn other personnel in the area before using
compressed air. To prevent injury, wear safety
glasses, goggles or a face shield.
Liquid Cooled Diesel Engine
1. Valve stem cap
2. Retainer lock
3. Valve spring retainer
Page 4 - 60
Figure 61
Figure 62
4. Valve stem seal
5. Valve spring
6. Valve
Workman 3300-D/4300-D