2007-03-03 14:56:01 · 10 answers · asked by Nursey 1 in Cars & Transportation ➔ Maintenance & Repairs
Worn main bearings on crank. Hot oil is thinner than cold oil.
2007-03-03 15:21:14 · answer #1 · answered by gejandsons 5 · 0⤊ 0⤋
Main bearings and oil pump. If your going to spend the time and effort the pump should be replaced too. If not, you can still get low oil pressure. Using a 20-50 oil may help but is harder on the motor in the winter since it is so much thicker than 10-30.
2007-03-03 15:34:09 · answer #2 · answered by freedismemberment 2 · 0⤊ 1⤋
Check you oil pressure sensor before you start replacing expensive parts. My Dodge pick up started showing low oil pressure after the engine warmed up. I replaced the oil pump only to find I still had the same problem. I took out the oil pressure sensor and screwed in a good quality pressure gauge and found I had plenty of pressure after the engine heated up. I sure feft dumb after all the fun I had replacing the oil pump and found out it was a $26.00 part that was easy to replace.
2007-03-03 16:06:45 · answer #3 · answered by fixitall 3 · 1⤊ 0⤋
clearances in a hot engine get wider and causes less restriction
(oil pressure) as engine parts wear the bearing clearances also get wider.the most and first oil pressure is from cam bearings
make sure that the cooling system is optimal then it may be necessary to go to a little higher viscosity oil (15-40).
2007-03-03 15:12:36 · answer #4 · answered by jamesd 3 · 1⤊ 0⤋
how many miles are on the engine? the oil flows better when warm so it is easier to push through the oil passages and between the bearings. as the bearings wear (say between the crank and the rods) it increases the gap which lets the oil flow easier which decreases the pressure.
2007-03-03 15:32:50 · answer #5 · answered by smjohnson55 4 · 0⤊ 0⤋
May be normal. Oil loses viscosity when it gets hot, so it will flow more easily and the pressure will be less. It is the flow, not the pressure, which saves your engine.
2007-03-03 15:06:58 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Your oil is old or too thin. get the oil pump check if an oil change doesnt fix the problem
2007-03-03 15:01:37 · answer #7 · answered by The Cactus 2 · 0⤊ 0⤋
What brand of vehicle? What model? What year? How many miles on it? The most likely cause is excessive bearing clearances.
2007-03-03 15:03:56 · answer #8 · answered by know da stuff 4 · 1⤊ 0⤋
a good rule of thumb is you need 10 psi of pressure for every thousand RPM's. If your getting that your good.
2007-03-03 15:18:47 · answer #9 · answered by steven s 2 · 0⤊ 0⤋
could be crappy oil, it thins out whens its hot, it could be thinning out to much, see if a change will fix it, its probly the cheapest way to go
2007-03-03 15:01:34 · answer #10 · answered by Tom C 2 · 0⤊ 0⤋