JMYSS
Senior Member
- Joined
- Aug 8, 2010
- Messages
- 154
Posted this on boatdiesel.com but thought I would see if anyone here had this experience...
We have a newley rebuilt 1978 6.354. It was originally rebuilt at TA Diesels, then suffered a severe overheat when a hose clamp on the freshwater side busted and the old guages did not catch it...after another rebuild at a local shop, all new senders, wiring, and guages from TA as well as mechanical oil/temp gueages installed, we are noticing a few things. When we broke it in we either ran 15w-40 or 30w rotella cannot remember...we where having issues with it setting off the oil pressure alarms once it was warmed up, but all the time, especially when maneuvering. We switched to 40 w. Upon cold start up, oil PSI on electric and mechanical guages is around 50 psi, dropping to 40 after warmed up. usually after about 45 minutes of running at cruise (2000 rpm) oil pressue will be around 30 psi...after cruising for a long time and while hot(178) when we drop below 1000 rpm or start maneuvering, the oil pressure drops WAY down around 10-12 psi and starts setting off our alarms. As soon as I rev it back up around 1000 it will come up enough to kill the alarms....but that means I am either shifting a little high, or listening to the alarms, which is not a good feeling...
So question is, has anyone else experienced this, what is the normal range for these engines, and what wieght are most people running? With the Shell Rotella 40w we are running now, we achieved higher pressures than 15w40 or 30 w, but not enough to keep alarms from going off at idle/shifting after a long run...around 85 hours on it now...
We have a newley rebuilt 1978 6.354. It was originally rebuilt at TA Diesels, then suffered a severe overheat when a hose clamp on the freshwater side busted and the old guages did not catch it...after another rebuild at a local shop, all new senders, wiring, and guages from TA as well as mechanical oil/temp gueages installed, we are noticing a few things. When we broke it in we either ran 15w-40 or 30w rotella cannot remember...we where having issues with it setting off the oil pressure alarms once it was warmed up, but all the time, especially when maneuvering. We switched to 40 w. Upon cold start up, oil PSI on electric and mechanical guages is around 50 psi, dropping to 40 after warmed up. usually after about 45 minutes of running at cruise (2000 rpm) oil pressue will be around 30 psi...after cruising for a long time and while hot(178) when we drop below 1000 rpm or start maneuvering, the oil pressure drops WAY down around 10-12 psi and starts setting off our alarms. As soon as I rev it back up around 1000 it will come up enough to kill the alarms....but that means I am either shifting a little high, or listening to the alarms, which is not a good feeling...
So question is, has anyone else experienced this, what is the normal range for these engines, and what wieght are most people running? With the Shell Rotella 40w we are running now, we achieved higher pressures than 15w40 or 30 w, but not enough to keep alarms from going off at idle/shifting after a long run...around 85 hours on it now...