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Measuring Installed Valve Stem Height For
1992-95 Mercedes Benz 3.2L DOHC Engines
The AERA Technical Committee offers the following information on measuring installed valve stem height for 1992-95 Mercedes Benz 3.2L DOHC engines. The method of measuring the installed stem height for this engine is not made in the conventional manner. According to Mercedes Benz, the prescribed method to measure is from the tip of each valve to the camshaft-bearing base (camshaft housing bore).
To correctly measure the intake and exhaust installed valve stem heights; lay a 6mm diameter bar onto the base of the camshaft bearing bores. Measure the distance at dimension ?T" as shown in Figure 1 below, using a caliper and record for all locations. Refer to chart below for specifications for the intake and exhaust installed valve stem height.
Location Standard ?T" Dimension Repair Limit ?T" Dimension
Intake .953-.974" (24.21-24.75mm) .943-.965" (23.96-24.51mm)
Exhaust .874-.896" (22.21-22.75mm) .865-.886" (21.96-22.51mm)
If, during checking the specifications against the recorded values and any measurement are under repair size, you must install new valve seats and/or valves in the head. These new seats and/or valves will help to properly position the hydraulic lash compensators for their correct operation.
Caution: Do not use a magnetic tool to remove the bucket type cam followers. If a magnetic tool is used and the buckets retain even a small amount of magnetism, the buckets may attract metal particles within the oil supply. Which, may cause possible camshaft lobe and follower failure.
Note: Dimension (H) shows a reference for a new head height of 5.350-5.354 (135.89-135.992 mm). The minimum head height is 5.335 (135.509 mm).
The AREA Technical Committee
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