mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

Procedures|Page 3840 > < Valve Guide|Specifications|Page 3837
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Valve Guide: Procedures

AR05.30-P-4511AV Check/Remove/Install Valve Guides

Inspecting, Removing, Installing Valve Guides

Remove

1

Remove valves

Inspection

2

Inspect valve guide,

NOTE:  Inspect valve guide if the measurements obtained are not within the stated tolerances, Replace valve guide.

Machining

3

Machine valve seat ring in cylinder head

NOTE:
-

Observe tool manufacturer's operating instructions, maintain dimensions in accordance with checking and machining dimensions.

-

If the measurements after machining are less than the specification, Replace valve seat ring.

Inspection

4

Measure seat width

NOTE:  Correct valve seat width if necessary.

5

Insert valve and inspect for leaks

NOTE:  Grind valve with valve grinding compound before installation.

6

Measure valve set-back to cylinder head

NOTE:
-

If measurement is less than minimum dimension no further correct valve clearance compensation is possible; replace valve seat ring or cylinder
head.

-

The valve must always be replaced after installing a new valve seat ring.

Install

7

Install valves.

AR05.30-P-3731AV Check/Remove/Install Valve Guides

Procedures|Page 3840 > < Valve Guide|Specifications|Page 3837