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Checking the valve guides
When repairing a leaking cylinder head valves is not enough to handle the valves and a working facet of saddles. It is important to check the valve guides for wear. Especially important is this test for engines with high mileage. Worn guides do not provide the central position of the valve and lead to higher oil consumption. If the wear is too great, valve guides should be replaced. | - Remove the valve.
- Clean the valve guide or a cylindrical brush cleaner.
 | - Measure the inner diameter of the valve guide in 6 locations.
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 | - Measure micrometer diameter of the valve stem in the 6 locations.
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- To determine the mean results of six measurements folded and divided into 6.
Engine designation | average size in mm | Valve stem | valve guide | inlet | outlet | | F | 8,985 1 | 7.975 1 | 9.185 / 8.1752 | | OT, B6, BPE | 5,970 - 5,985 | 5,965 - 5,980 | 6.01 - 6.03 | | BSE, B5, V6E | 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 - minimum size. 2 - the greatest value for the inlet. / Prom. - Subtract the average diameter of the valve guide the average diameter of the valve stem. This determines the maximum radial play. The maximum radial clearance: 0.20 mm (0.10 mm diesel).
- If the values are exceeded, replace the valve guide (performed in a workshop), or valves.
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