| Replacing the valve guides |
| Special tools and workshop equipment required |
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| Driver 7 mm -MP1-205 (3121)- |
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| Cutting fluid for reamer cooling |
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| Clean the cylinder head and check it. |
| Heads whose valve seat rings can no longer be reworked or cylinder heads which have already been machined down to their minimum dimension are unsuitable for replacing the valve guides. |
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| Press out worn valve guides with -MP1-205- from the camshaft side, valve guides with collar (requiring repair) from the combustion chamber side. |
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| Press the new guides which have been wetted with oil into the cold cylinder head using the driver -MP1-205-, from the camshaft side up to the collar. |
Note | Once the guide has been pressed against the collar, then the pressing in pressure should not be increased above 10 kN, otherwise the collar can break off. |
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| Ream the valve guides using the reamer -MP1-204-. Absolutely use the cutting fluid for the reamer cooling for this step. |
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