i have a 95 42 ft corsa with twin 6 bta cummins i had a pretty good oil leak i found it behind the acc gearcover to repair i pulled outer cover rolled #1 to tdc and found i have a crack on cam gear ay keyway no big deal cause cams gotta come out to repair leak anyway what whould cause it to crack? this comes right after i ha new themostats rad and rad hoses repaired on my 6.4 ps ford