Troubleshooting Guide


There are a few key items that you need to address relating to the oiling system for a turbocharged vehicle. All of the following items need to be accounted for to ensure proper operation. Also download the TroubleShooting Matrix to help you diagnose any issues that you might be encountering.


• -3AN or -4AN (1/8”) maximum oil inlet line

• -10AN (1/2”) minimum oil drain line

• Orientation of oil inlet on bearing housing must not be greater than 15° from vertical.

• No 90° turns or kinks in drain line

• The use of silicone at or around all oil holes should be avoided at all times due to possible constriction of the holes due to silicone impeding oil flow when the silicone is applied and torqued to flange surfaces

• Oil line needs to make smooth transition into oil pan (no 90° fittings on pan)

• Oil drain needs to be placed as high as possible on oil pan (above the oil level)

• Hole in oil pan must match the oil drain line size

• If oil drain is located next to crankshaft main journal, then possible crank windage may occur (oil being thrown towards oil drain hole)

• Adequate crankcase ventilation

• No vacuum can be placed in the compressor inlet of the turbocharger unless turbocharger has a carbon seal installed

• Clean air filter

• Turbocharger must be mounted above the level of the oil pan so that oil can flow freely to the oil pan by gravity alone

• If the turbocharger is mounted below the top of the oil pan then a scavenging system must be implemented

• Excessively high oil pressure at idle may cause oil leakage and/or smoking at idle or deceleration

• Upon cold startup the use of heavy weight oil may cause smoking and/or leakage until oil temp increases to proper operating range


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