| Replacing the valve guides |
| Special tools and workshop equipment required |
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| Hand broach -MP 1-204 - and diluted soluble oil |
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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 driver -MP 1-205 - from the camshaft side (valve guides with a 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 -MP 1-205-, 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 guide using the hand broach -MP 1-204-. It is essential to use dilute soluble oil while doing this. |
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