Abstract: A modular catalytic converter and muffler is used to purify exhaust from a relatively large diesel engine. The device includes various structural components that are mounted in the exhaust flow path within a housing having an inlet and an outlet. A plate mounted within the housing divides the housing into an inlet chamber and an outlet chamber. A plurality of catalytic converter sub-cans are mounted across the plate between the inlet chamber and the outlet chamber. A flow distributor is mounted within the housing upstream of the catalytic converter sub-cans. The flow distributor divides and directs a portion of the exhaust to each of the catalytic converter sub-cans. Some muffler structure is mounted within the housing between the catalytic converter sub-cans and the outlet in order to attenuate noise in the exhaust.

Abstract: A pair of C-shaped springs adapted for biasing a needle check valve of a fuel injector toward a closed position. The springs are capable of providing a valve opening pressure several times larger than that provided by conventional helical springs, while occupying roughly the same amount of space as prior art biasing springs. Preferably, the individual C-shaped biasing springs include semi-circular indentations in their upper and lower end edges so that the biasing springs abut against each other and substantially surround the shaft of the needle stop for the check valve.