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Servicing valve gear
Renewing valve guides
Special tools, testers and auxiliary items
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◆ Drift 3121
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◆ Hand reamer 3120 and cutting fluid
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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.
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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).
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‒ Coat new guides with oil and press in with 3121 from the camshaft side (cylinder head cold) until shoulder makes contact.
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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