Inspect valve stroke

AR05.00-B-1500B

Inspect valve stroke

19.03.2020

Engine

904.9, 906.9, 924.9, 926.9 in model 368.0/1, 382.1, 384.06/07, 634.0, 685.282/284/289/290, 979.2

1

Rocker arms

2

Valves

3

Valve sticks

4

Dial gage holder

5

Dial gage

6

Spring retainer

7

Valve bridge

A

Valve clearance

B

Valve stroke



Remove

1

Remove the cylinder head cover

.

AR01.20-B-5014B

2

Install a device to turn the engine

.

AR03.30-B-1600-03A

 Turning device

*904589046300



Check

3

Turn the crankshaft in the operating direction until the piston of the cylinder corresponding to the valves to be checked, reaches the TDC of the compression stroke

 In this case, the valves to be checked are totally closed, valves clearance can be checked, and pushrods can be easily spun.

4

Adjust the clearance of the valves (A) to be checked



Set valve clearance

.

AP05.30-B-0560B

5

Fasten the dial gage support (4) in such a manner that the dial gage feeler (5) rests on the spring retainer (6) of the exhaust valve or on the intake valves bridge (7). Set the dial gage scale to “0”

 Set the dial gage with 15 mm preload, in order to enable the measuring of the valve stroke (B).

 Dial gage

*001589532100

 Dial indicator holder

*363589022100

6

Check the valve stroke (B)

 Turn the crankshaft in the operating direction until observing the maximum valve stroke (B), indicated on the dial gage. The valve will be completely open (maximum stroke), before the dial gage pointer reverses the direction of movement.

 Check the stroke (B) of all valves.

7

Compare the values found out ​​with the specified values

.

AR05.20-B-6292A

 If value (B) obtained in the checking is lower than the specified value, check eventual wear on the camshaft cams.

.maximum valve stroke (adjusted to specified valve lash)

*BE05.30-B-1002-01D



Install

8

Install the cylinder head cover

.

AR01.20-B-5014B

9

Remove the engine turning device

.

AR03.30-B-1600-03A

 Turning device

*904589046300

Test value for the valves

Number

Designation

Engine 904.9 until 415751

Engine 902.9,
Engine 906.9 from 415752

BE05.30-B-1002-01D

maximum valve stroke (adjusted to specified valve lash)

intake

mm

9,7

9,7

exhaust

mm

10,7

10,7

Test value for the valves

Number

Designation

Engines 924.9, 926.9

BE05.30-B-1002-01D

maximum valve stroke (adjusted to specified valve lash)

intake

mm

9,7

exhaust

mm

10,7