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Removing
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‒ Clean and check cylinder head. Cylinder heads in which the valve seats can no longer be reworked, or cylinder heads which have already been machined to the minimum dimension, should not have the valve guides replaced.
The permissible minimum dimension must be maintained , Fig.1
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‒ Press out worn valve guides with 3121 from the camshaft side (valve guides with shoulder - repair version - from the combustion chamber side).
Installing
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‒ Press in new guides, moistened with oil, from camshaft side onto shoulder in cold cylinder head using drift 3121.
Note:
When the shoulder on guide makes contact, the pressure must not exceed 1.0 t otherwise shoulder may break off.
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‒ Ream guides out with hand reamer 3120 using plenty of cutting fluid.
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‒ Rework valve seats .
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