6. | If four numbers or marks (1 to 4 or 6 to 6666) are printed around the outside of the filter, use the following procedure to tighten the filter.
- Spin the filter on until its seal lightly seats against the block, and note which number or mark is at the bottom.
- Tighten the filter by turning it clockwise three numbers or marks from the one you noted. For example, if number 2 is at the bottom when the seal is seated, tighten the filter until the number 1 comes around the bottom.
Number or Mark when rubber seal is seated | 1 or 6 | 2 or 66 | 3 or 666 | 4 or 6666 | Number or Mark after tightening | 4 or 6666 | 1 or 6 | 2 or 66 | 3 or 666 |
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