Cm870 oil running hot

[Signature620]

Probably your oil thermostat. It's behind the big plug at the very front of the oil cooler housing (you'll need a 19mm hex bit). You need to remove the A/C compresor, disconnect alternator (or let it hang if cables permit) then remove the bracket they mount to for access. Then you need a good pair of circlip pliers and a mirror to get the circlip and thermostat out. Just slip in the new one and reassemble. The roung side of the circlip goes to the front & the tension for the big plug is 74ft-lb (change the o-ring while you're at it.)

EDIT: Are you getting high oil temp faults? Also make sure your dash gauge and Cummins oil temp sensor are reading similar! Hate to do all that work for a bad gauge or sender, hahah.