Apart from the single-piece oil return pipes, two-piece oil return pipes are supplied for repair purposes to allow the return pipes to be replaced without removing and dismantling the engine. When rebuilding the engine, however, single-piece oil return pipes should be fitted as before.

4. Preassemble two-piece oil return pipe, i.e. fit O-ring and round seal and coat lightly with tire assembly paste (e.g. Contifix). Press snap ring out of groove and push approx. 40 mm onto the pipe. Assemble both pipes.

5. Fit assembled pipes to engine and press them apart so that the round seals are seated in the sealing faces and the snap ring groove is free.

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