Removing Valves

Information 

• Secure the cylinder head on a level surface, which allows easy access to the valves from underneath. 
• No valves should be hidden by the support under the cylinder head. 
• The cylinder head mounting must not tip over when tools are used. 

1. Before removing the valves, remove the spark plugs and screw in the valve lock > Screwing in tool  . The valve lock prevents the valves from opening when they are pressed down. Alternatively, a rubber plate placed underneath helps on a level cylinder head surface -2-  .

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   Screwing in tool

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   Locking valves

2. Fit and set the tool on the cylinder head.
   1. 2.1 Screw a holder -1-  with a suitable thread into the matching thread on the cylinder head. The hook -2-  is pre-fitted in the holder.

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      Fitting hook

   2. 2.2 Insert a suitable plastic guide -1-  instead of the cam follower.

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      Inserting plastic guide

   3. 2.3 Insert assembly cartridge -1-  for the valve keys into the plastic guide.

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      Inserting assembly cartridge

   4. 2.4 Engage a lever (assembly fork) -1-  into the hook and position it correctly on the assembly cartridge. Make sure that the tool and equipment can work straight.

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   Tool fitted correctly

3. Remove the valve keys.
   1. 3.1 Press the assembly cartridge down against the valve spring force using a lever (assembly fork) and keep it pressed > Pressing down tool  . The knurled screw on the assembly cartridge moves forward -1-  .

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      Pressing down tool

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      Pressing down lever and knurled screw

      Information 

      The mechanic must practise for use of the assembly cartridge to be effective. Some repetitions must be made to ensure that the valve keys are correctly held in place.

   2. 3.2 Turn the knurled screw back and forward -1-  so that the valve keys engage and are held in the assembly cartridge -2-  . The knurled screw moves back again.

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      Turning knurled screw back and forward

   3. 3.3 Remove the assembly cartridge and check that the two valve keys are positioned correctly -1-  .

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      Valve keys in assembly cartridge

   4. 3.4 Pull the knurled screw on the assembly cartridge -1-  and disengage the valve keys -2-  .

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   Removing valve keys

4. Remove valve springs, spring plate and valve keys from the cylinder head.
5. Remove valve locks and push the valves to the side of the combustion chamber.