- This topic has 7 replies, 3 voices, and was last updated 6 years ago by .
-
Topic
-
Hi All – I am moving this topic here from boatdiesel.com because of minimal response there –
I have very high oil consumption on one of my two engines on a 2005 Tiara Open cruiser. Here are some of the details:
– Both engines have appx 980 hours.
– Starboard engine uses appx 1 quart per 1,000 gallons of fuel.
– Port engine uses appx 40 quarts per 1,000 gallons of fuel.
– The high oil consumption has probably been going on quite a while but has been masked because we had been going on very short trips (in the Canadian Northeast) and because consumption is lower at idle than cruise. This summer we have done some high speed cruising in the Northwest.
– I calibrated the dipstick and am running 15 quarts of Rotella 15-40 in the pan. I tried running with only 12-13 quarts but did not observe any change in the high oil consumption.
– Little to no oil under engine
– Consumption seems significantly higher at cruise than when traveling slowly.
– A very small amount of oil evidence around the back of the engine on Air Sep stuff and gear cooler area.
– No smoke from engine during operation except for a small “puff” when power is applied after a long time idling.
– A small number of oil droplets are visible on the water when the engine isn’t “hot” and is run up to 2000 rpm in neutral.
– A small amount of blue smoke visible in the exhaust when the engine is run up to 2000 rpm in neutral after running at cruise conditions (i.e. the engine is “hot”).
– Possible causes identified by a Cummin´s tech (quick visit in Canada this summer) included a failed turbo oil bearing seal and valve stem seal failure(s).
I have removed the in/out on the turbo and both are clean.
The Cummins tech in Canada did a qualitative blowby test by removing the valve cover hose going to the AirSep system and putting his hand over each He said they were both similar but it was a pretty quick and dirty test.
I know I probably need to get a mechanic involved (Cummins or other) but would really appreciate thoughts from the experts before I start down that path.
You must be logged in to reply to this topic.