1. Remove valve.
2. Clean the valve guide with a cylindrical brush or cleaner.
3. Measure the inside diameter of the valve guide at 6 locations.
4. Measure the diameter of the valve stem in 6 places with a micrometer.
5. To determine the average value, add the results of six measurements and divide by 6.
Engine designation | average size in mm | ||
valve stem | valve guide | ||
inlet | high school graduation | ||
F | 8,985 1 | 7,975 1 | 9,185/8,1752 |
VZ, V6, VRE | 5,970 — 5,985 | 5,965 — 5,980 | 6,01 — 6,03 |
VZE, B5, B6E | 6,970 — 6,985 | 6,965 — 6,980 | 7,01 — 7,03 |
PN | 6,970 — 6,985 | 6,950 — 6,965 | 7,017 — 7,037 |
1 is the minimum size.
2 - the highest value for inlet / outlet.
6. Subtract the average valve stem diameter from the average valve guide diameter. This determines the maximum radial play. Maximum radial play: 0.20 mm (diesel 0.10 mm).
7. If the values are exceeded, the valve guides must be replaced (performed in the workshop) or valves.