Addition of MCRS low pressure fuel pump pressure relief valve for QSK38/50/60 Kelle Ravn May 20th 2015 (Changed “check valve” in May 18th version to “pressure relief valve” to be more accurate)

Description of design change The fuel drain block has been redesigned, increasing the depth by 55 mm (2.17 in) and shifting the Centinel drain port outward by 10 mm (0.39 in). A new hose and a ‘T’ fitting will be used to add a pressure relief valve to the low pressure fuel pump, routing overflow to the drain block. The hose from the low pressure fuel pump to the stage 2 filter head has been redesigned to accommodate the ‘t’ fitting mentioned above. The elbow on the stage 2 filter head has been replaced to accommodate the ‘T’ fitting mentioned above (QSK38/50 only). See slides 3-8 for further details Reason for design change It has been confirmed that the MCRS low pressure fuel pump and rear bearing could potentially fail as a result of stage 2 fuel filter plugging. To address this, an external 11 bar pressure relief valve will be added to route flow to the drain block. Potential impact to OEM The OEM will have to shorten their ‘fuel tank to drain block’ hose by approximately 55 mm (2.17 in) OR accommodate approximately 55 mm (2.17 in) slack in the hose. The OEM is required to select a flex hose size of at least No. 8, but it is recommended that No. 10 or higher be used to connect the drain block to the fuel tank. This is due to increased restriction caused by the increased return fuel to the drain block. For OEMs that use off-engine mounted stage 2 fuel filters, the OEM may need to redesign their hose connecting the low pressure fuel pump to the stage 2 filter head. 12/29/2018 Cummins Confidential

QSK 38 overview (more details next slide) Current Change (to be implemented) 12/29/2018 Cummins Confidential

QSK 38 Current Change (to be implemented) 1 1 2 2 3 3 4 4 5 5 Redesigned drain manifold by: moving the Centinel port outward by 10 mm adding a new port, which increased the depth by 55 mm 55 mm 110 mm 1 2 New hose 2 3 ‘T’ fitting with pressure relief valve 3 4 Redesigned hose to accommodate ‘T’ fitting 4 5 5 New elbow on Stage 2 fuel filter head 12/29/2018 Cummins Confidential

QSK 50 Current Change (to be implemented) 12/29/2018 Cummins Confidential

QSK 50 Current Change (to be implemented) 1 1 2 2 3 3 4 4 5 5 Redesigned drain manifold by: moving the Centinel port outward by 10 mm adding a new port, which increased the depth by 55 mm 1 55 mm 110 mm 1 2 New hose 2 3 3 ‘T’ fitting with pressure relief valve 4 4 Redesigned hose to accommodate ‘T’ fitting New elbow on Stage 2 fuel filter head 5 5 12/29/2018 Cummins Confidential

QSK 60 overview (more details next slide) Current Change (to be implemented) 12/29/2018 Cummins Confidential

QSK 60 Current Change (to be implemented) 1 1 2 2 3 3 4 4 55 mm Redesigned drain manifold by: moving the Centinel port outward by 10 mm adding a new port, which increased the depth by 55 mm 1 110 mm 1 2 2 New hose 3 ‘T’ fitting with pressure relief valve 3 4 Redesigned hose to accommodate ‘t’ fitting 4 12/29/2018 Cummins Confidential

QSK 38 fuel filter options QSK 38 associated dependent options QSK 38 options affected QSK 38 fuel filter options Old option New option FF 6125 FF 6235 FF 6126 FF 6236 FF 6135 FF 6239 FF 6140 FF 6237 FF 6141 FF 6238 FF 6169 FF 6240 FF 6182 FF 6241 FF 6192 FF 6242 FF 6193 FF 6243 FF 6224 FF 6244 QSK 38 associated dependent options Old option New option FD 6706 FD 6738 FD 6711 FD 6736 FD 6715 FD 6737 FD 6735 FD 6739 FP 6907 FP 6963 FP 6961 FP 6965 Once the new options are released at P phase, the old options will be restricted in COLS. 12/29/2018 Cummins Confidential

QSK 50 fuel filter options QSK 50 associated dependent options QSK 50 options affected QSK 50 fuel filter options Old option New option FF 6127 FF 6245 FF 6128 FF 6246 FF 6136 FF 6247 FF 6140 FF 6237 FF 6141 FF 6238 FF 6147 FF 6248 FF 6170 FF 6249 FF 6183 FF 6250 FF 6194 FF 6251 FF 6195 FF 6252 QSK 50 associated dependent options Old option New option FD 6707 FD 6740 FD 6708 FD 6741 FD 6712 FD 6742 FD 6716 FD 6743 FP 6908 FP 6966 FP 6910 FP 6967 Once the new options are released at P phase, the old options will be restricted in COLS. 12/29/2018 Cummins Confidential

QSK 60 associated dependent options QSK 60 options affected QSK 60 fuel filter options Old option New option FF 6103 FF 66254 FF 6117 FF 66255 FF 6132 FF 66256 FF 6148 FF 66257 FF 6167 FF 66258 FF 6180 FF 66259 QSK 60 associated dependent options Old option New option FD 6709 FD 6744 FD 6710 FD 6745 FD 6714 FD 6746 FP 6909 FP 6969 FP 6911 FP 6970 Once the new options are released at P phase, the old options will be restricted in COLS. 12/29/2018 Cummins Confidential