Oil pressure?
12-12-2007, 05:26 AM
#1
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Oil pressure?
Recently, after my truck has been sitting for a while. I start it I have NO oil pressure. I found after a few moments (once it is a little warm) I get great pressure. This has just recently started? I changed the oil to make sure the correct 5 W20 was used but still have the problem. Any Ideas?
Jeff
Jeff
12-13-2007, 12:29 PM
#4
Senior Member
The drainback valve is typically integral to the oil filter.
Borrowing from http://www.freepatentsonline.com/20070246409.html :
"Anti-drainback valves are used in oil filters to prevent the back flow of oil from the filter once an engine is shut off. The anti-drainback valve retains the oil in the filter where it is ready for the next engine start, and also prevents debris at a dirty side of filter media within the filter from entering the oil system. "
Many filters offer this device, not all of them work properly. Don't know that the current oil filter testing procedures include the functionality of the valve.
Borrowing from http://www.freepatentsonline.com/20070246409.html :
"Anti-drainback valves are used in oil filters to prevent the back flow of oil from the filter once an engine is shut off. The anti-drainback valve retains the oil in the filter where it is ready for the next engine start, and also prevents debris at a dirty side of filter media within the filter from entering the oil system. "
Many filters offer this device, not all of them work properly. Don't know that the current oil filter testing procedures include the functionality of the valve.
