Replacing the exhaust valve and/or spring

Step 1 - Strip Down

Step 3 - Separate the Action

Step 2 - Remove the Trigger

Inlet Valve Spring & Seal no. 2658 for the Weihrauch HW100

Remove the magazine (making sure the gun is not cocked and is empty), remove the scope and scope mounts, remove the action from the stock (2 bolts underneath the stock), then remove the air cylinder (buddy bottle/tube).

Step 2 - Remove the Trigger

Step 3 - Separate the Action

Step 2 - Remove the Trigger

Removing the trigger section from the Weihrauch HW100

Remove the 2 hex head bolts that release the trigger mechanism - indicated by the 2 red arrows in the picture.

Step 3 - Separate the Action

Step 4 - Remove Valve Housing

Removing the action connection screw from the Weihrauch HW100

Remove the action connection bolts/screws and separate the action into two pieces.

Step 4 - Remove Valve Housing

Step 5 - Replace Spring & Seal

Step 4 - Remove Valve Housing

Do not overtighten the bolts on on the Valve Housing Insert of the Weihrauch HW100

Remove the two bolts/screws hold the Valve Housing Insert in place to expose the inlet valve stem/pin and spring. When re-assembling, do NOT overtighten these screws.

Step 5 - Replace Spring & Seal

Exhaust Valve, Spring and oring seal for the Weihrauch HW100

The original O-ring 2658 will have been a "crush fit", remove the valve & replace this oring with the one supplied in our kit. Making sure you give it a light coat of Molykote III.

Step 6 - Re-assemble

Step 5 - Replace Spring & Seal

Upgraded Fast Flow Exhaust Valve, Spring & Seal no. 2658 for the Weihrauch HW100

Re-assemble the gun - making sure you do not overtighten the screws to the Valve Housing.

Buy the Fast Flow Valve

Air Leaking Down the Barrel after Re-assembly?

The leak could be caused by low cylinder pressure if you fill your cylinder slowly or fit an empty air cylinder - the fix is to quickly introduce around 40 BAR into the cylinder. Because the valve spring alone does not apply sufficient pressure to complete the seal, it is aided by the regulated air pressure behind the exhaust valve. Also, be aware that some dive cylinders have restrictors already fitted into them that make the filling very slow. If this is the case, borrow someone elses cylinder, it really does work! WARNING: If you have an after-market aluminium cylinder, please be aware that it is not recommended that you fill it quickly due to safety reasons.

If the leak persists, you may need to polish the valve seat - CLICK HERE for a short video on how to fix an air leak down the barrel.

Replacing the exhaust valve and/or spring

Step 1 - Strip Down

Step 3 - Separate the Action

Step 2 - Remove the Trigger

Step 2 - Remove the Trigger

Step 3 - Separate the Action

Step 2 - Remove the Trigger

Step 3 - Separate the Action

Step 3 - Separate the Action

Step 4 - Remove Valve Housing

Step 4 - Remove Valve Housing

Step 5 - Replace Spring & Seal

Step 4 - Remove Valve Housing

Step 5 - Replace Spring & Seal

Step 5 - Replace Spring & Seal

Step 5 - Replace Spring & Seal

Step 6 - Re-assemble

Step 5 - Replace Spring & Seal

Step 5 - Replace Spring & Seal

Air Leaking Down the Barrel after Re-assembly?

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