Kärcher K3.86 Cylinder head replacement

Disconnect the hose of the external tank.

Unsnap the power cord from the casing.

Release the high pressure unit from the housing.

Pull the metal clips that hold the pipes in place with pliers.

Once released, put the pipes and clips aside. Make sure you don't lose the seals.

With the use of a Philips screwdriver release the earth connector from the metal flange.

Carefully loosen each of the 4 screws that hold the flange attached to the high-pressure chamber of the pump.

Before to completely release the flange and the head of the pump hold the flange firmly with your other hand or ask a friend for help. Springs inside the pump push hard.

Firmly hold the piston guidance.

In order to protect the inside of the pump from dust, reposition the 4 screws to hold the piston guidance in place.

Carefully pull the seal, injector and valve from the head of the pump.

Check that you have in hand all these parts before to assemble the new head.

The spare part 9.001-216.0 : the head of the high-pressure chamber.

The triangle-shaped seal: this part has been previously removed from the to-be-replaced head.

The white pipe to connect the pump to the external tank: this part has been removed from the head to be replaced.

The control piston and its spring picked from the head to be replaced. The control piston acts on an external switch which electrically commands the start of the washer.

The red suction part retrieved from the head to be replaced.

The injector removed from the head to be replaced.

Insert the control piston into the hole circled in red.

Place the cleaning material after inserting the control piston. The white pipe must be placed exactly in the same position as shown in the picture.

Mount the suction pipe into the head as shown in the picture.

Mount the injector into the head as shown in the picture.

Place the seal. If the seal is dry add some silicone grease.

Put the metal flange on the head.

Retrieve the four screws that hold the pistons in place. The springs of the piston push hard outward: firmly hold them in place while you bring and put the head in place.

Start mounting two diagonally opposite screws.

Finish mounting the two other screws

Jiggle the electrical unit of the pump.

Stop jiggling the electrical unit after you hear a 'click'.

Make sure that the earth connection is screwed to the metal flange of the head BEFORE any electrical testing.

Only after that you may briefly test the start of the pump.

Make sure you did not lose the small-sized seal of the high-pressure pipe.

Remount the seal inside the pipe before remounting the pipe on the high-pressure unit.

Place the pipes in the same position as shown in the pictures.

Push the metal clips to hold the pipes in place.

Carefully reposition the high-pressure unit into the casing of the washer.

It must fit gently into the casing . No need to force the fitting.