TM   10-3930-643-20 ENGINE, FUEL, EXHAUST AND COOLING TROUBLESHOOTING AND MAINTENANCE. 4-2. d. 1. 2. 3. 4. 5. 6. Engine   STE/ICE   Tests. TEST  35  -   ENGINE  OIL  PRESSURE. Refer   to   VTM-General   Setup   and   Checkout   Instructions   in   TM   9-4910- 571-12&P. Connect   power   cables   to   battery,   as   shown   in   4-2a. Remove   wire   lead   from   oil   pressure   switch. Remove   switch. Install   elbow   TK   27   and   reducer   TK   20. Insert   blue   transducer. Connect   cable,   as   shown. Perform   test   using   procedure   Test   50   as   instructed   in   TM   9-4910-571-12&P. Compare   test   results   with   parameters. Engine   oil   pressure   with   coolant   at   normal   operating   temperature   in   psi. Low   idle   speed 15  to  30  psi Normal   operating   speed 42   to   65   psi Minimum   at   rated   speed 35   psi Return   vehicle   to   its   original   condition. 4-9