Tensioner

1. A tensioner comprising:

a base having a shaft and having a radially projecting tab therefrom;

a pivot arm pivotally engaged with the shaft about a pivot axis A-A;

a torsion spring disposed between the base and the pivot arm, the torsion spring in a compressed state;

a pulley journalled to the pivot arm;

a first axial member extending from the pivot arm, the first axial member comprising a radially projecting portion adjacent to a radially receding portion; and

the radially projecting portion engaging the radially projecting tab in a first pivot arm position and the radially receding portion cooperating with the radially projecting tab in a second pivot arm position; and

a retaining member having a clip engaged with the shaft to retain the pivot arm on the shaft against a torsion spring force.

2. The tensioner as in claim 1 , wherein a pivot arm movement from the first pivot arm position to the second pivot arm position is in an axial direction.

3. The tensioner as in claim 2 , wherein the torsion spring is compressed by movement of the pivot arm from the first pivot arm position to the second pivot arm position.

4. The tensioner as in claim 1 further comprising a bushing disposed between the shaft and pivot arm.

5. The tensioner as in claim 1 , wherein the first axial member extends in an axial direction parallel to the shaft.

6. The tensioner as in claim 1 , wherein the pivot arm pivot axis A-A is offset and parallel to a pulley rotational axis B-B.

7. A tensioner comprising:

a base having a shaft and having a base projecting portion;

a pivot arm pivotally engaged with the shaft about a pivot axis A-A;

a torsion spring disposed between the base and the pivot arm, the torsion spring in a compressed state;

a pulley journalled to the pivot arm;

an axial member extending from the pivot arm, the axial member comprising a radially projecting portion adjacent to a radially receding portion;

the base projecting portion engaging the radially projecting portion in a first pivot arm position and the radially receding portion cooperating with the base projecting portion in a second pivot arm position, the first pivot arm position is axially displaced from the second pivot arm position; and

a retaining member having a clip engaged with the shaft to retain the pivot arm on the shaft against a torsion spring force.

8. The tensioner as in claim 7 , wherein the axial displacement is determined by a fastener.

9. A tensioner comprising:

a base;

a pivot arm pivotally engaged with the base;

a torsion spring disposed between the pivot arm and the base;

the base comprising a base member selectively engagable with a pivot arm member;

the pivot arm member selectively engaged with the base member or disengaged from the base member according to an axial position of the pivot arm; and

a retaining member having a clip engaged with the shaft to retain the pivot arm on the shaft against a torsion spring force.

10. The tensioner as in claim 9 , wherein the torsion spring is in compression.

11. The tensioner as in claim 9 , wherein a pulley rotation axis B-B is offset from a pivot axis A-A.

12. The tensioner as in claim 9 , wherein the base member projects radially from a pivot axis A-A.

13. The tensioner as in claim 9 further comprising a pulley journalled to the pivot arm.

14. The tensioner as in claim 9 , wherein the axial position of the pivot arm is determined by a fastener installation position.