Oil Pump Assembly
Customer is using two solid wall ground dowels in the assembly of an oil pump. The bushings are used to align the two side covers to the body of the pump. An M6 bolt then passes through the ID of the bushing to fasten the housings, holding the plate in the middle of the assembly. The current design is a solid-wall, hollow, ground dowel. The use of a ground dowel requires a precise, accurate hole. Due to the tight OD tolerance, the hole must be reamed to the proper dimension – this type of secondary operation adds cost to the assembly. If the OD of the dowel bushing is not per print, i.e. too large, the installation force will increase significantly. This could either destroy the oil pump housing or even cause a great deal of damage to the insertion machine. If the dowel bushing is too small, the dowel will simply fall through the housing. In a worse case scenario, the dowel bushing keeps the assembly together, the pump is assembled on a vehicle, and due to “play” in the bushing and housing, the oil pump fails.