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Servicing valve gear
Renewing valve guides
Special tools, testers and auxiliary items
Valve stem ø 8 mm:
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◆ Drift 3121
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◆ Hand reamer 3120 and cutting fluid
Valve stem ø 7 mm:
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◆ Drift 3121
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◆ Hand reamer 3120 and cutting fluid
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.
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‒ Press worn valve guides out with
Valve stem ø 8 mm: 10-206
Valve stem ø 7 mm: 3121
from the camshaft side (valve guides with collar -service version- from the combustion chamber side).
Installing
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‒ Coat new guides with oil and press in with 10-206/3121 from the camshaft side with 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
Valve stem ø 8 mm: 10-215
Valve stem ø 7 mm: 3120
using plenty of cutting fluid.
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‒ Rework valve seats
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