Secondary engine covers
According to the present invention, there is provided a secondary engine cover formed from a polymeric material comprising a wear indicator, wherein the wear indicator comprises a region of reduced thickness of polymeric material and wherein the region of reduced thickness comprises a blind hole.
1. A secondary engine cover formed from a polymeric material comprising a wear indicator, wherein the wear indicator comprises a region of reduced thickness of polymeric material and wherein the region of reduced thickness comprises a blind hole.
2. The secondary engine cover as claimed in claim 1 wherein the wear indicator comprises a plurality of regions of reduced thickness of polymeric material.
3. The secondary engine cover as claimed in claim 1 wherein the thickness of the region of reduced thickness is between 1 mm and 2.5 mm.
4. The secondary engine cover as claimed in claim 1 wherein the thickness of the region of reduced thickness is between 1.5 mm and 2 mm.
5. The secondary engine cover as claimed in claim 1 wherein the thickness of the region of reduced thickness is 1.7 mm.
6. The secondary engine cover as claimed in claim 1 wherein the blind hold is infilled with a material that is visually distinct from the polymeric material.
7. The secondary engine cover as claimed in claim 1 wherein, in use, when the region of reduced thickness of polymeric material is worn away, a hole through the secondary engine cover is created which indicates that the secondary engine cover should be replaced.
8. The secondary engine cover as claimed in claim 6 wherein, in use, when the region of reduced thickness of polymeric material is worn away, the visually distinct infill material become visible which indicates that the secondary engine cover should be replaced.