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Re: Checking engine oil levels
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Posted by Jon Hagen on October 16, 2005 at 07:32:00 from (69.26.16.49):
In Reply to: Checking engine oil levels posted by Johnski on October 16, 2005 at 06:57:19:
You are totally right. On engines like Cummins with the expanding plug dipstick,the air tight fit of the dipstick in the tube will cause a vacuum as the engine cools which draws oil up into the tube and causes a false high oil reading. With my 855 and L10 Cummins,the oil level always reads high untill I remove the stick which releases the trapped air/oil,wipe the stick and re insert,then remove and read the oil level. Not doing this will cause the oil to read as much as 1 gallon too high.
I almost ruined a little aircooled Volkswagen engine this year because I believed that it's ordinary unsealed dipstick in the steel tube was not going to have the same problem of the sealed top type dipsticks. I had been just pulling the dipstick on the cold engine and reading the level,Altho the engine seemed to be useing less than normal oil,I trusted the dipstick reading. That is untill one morning I checked the oil which read fill then started the engine,after a minute or two the oil light started to flicker. I shut it down and after a few min drain down I rechecked the oil. The oil hardly touched the end of the stick!! The dipstick dust cap is a tight fit on the tube,and with a little oil film on there to form a seal,it had the same problem as the rubber sealed dipsticks. Just glad I caught the flickering oil light before I cooked that engine. I now pull/wipe/insert/pull/read the oil level on any type of dipstick.
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