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Post by njhcx4xlife on Nov 28, 2004 23:17:04 GMT -3
first i will start by asking what the oil pressure should be in my 2000 tj 4.0? It seemed tro always run at a constant 40 but now it seems to drop to around 30 when i am at a stop and when i really get on the gas it jumps to like 60 and eventually levels out again to 40 when i get cruising. is this just something i never noticed or is it a cause for concern.
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Post by jeepgod on Nov 28, 2004 23:30:33 GMT -3
totally normal, do not worry. general rule 10pds of oil pressure for every 1000 rpm
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Post by jps4jeep on Nov 29, 2004 13:31:29 GMT -3
Oil press drops when yu stop cause all the oil rushes to the front of the oil pan and the oil pick up is in the rear. 100% normal
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Post by SPYDER on Nov 29, 2004 16:54:32 GMT -3
dont' worry about it...the gauges in jeeps suck...my temp and oil pressure gauge broke after about 2 weeks with my jeep and then were fixed and now the oil pressure guage works when it wants....its fun let me tell you.
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Post by creeperjeep on Dec 17, 2004 19:26:15 GMT -3
Oil press drops when yu stop cause all the oil rushes to the front of the oil pan and the oil pick up is in the rear. 100% normal Ya....id agree with you only if you were 3-4 quarts low...
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Post by jps4jeep on Dec 20, 2004 11:46:26 GMT -3
Ammmm. no, when a motor is running about 2-3 quarts of the oil is circulating through the motor, the pan itself will only have a small portion, the filter alone will have about 1/3 of a quart. if you were 3-4 quarts low, you probably wouldn't have any oil pressure.
If you ever build a 1/4 mile motor, cause they go from stop-go-stop very quickly, lots of people will blow a motor cause they loos pressure under stoping from 100+ mph, so... the oil pan has these lottle passages the allow the oil to flow through, but when under hard braking, these balls that look like huge ball bearings will slide foward and slightly up and plug the passages so that the oil remains in the rear of te pan for the Sump to pick it up. This is a extreme situation, but a daily driver is the same. if you don't see this, It might be due to a slow sending unit or guage.
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Post by jps4jeep on Dec 20, 2004 11:50:53 GMT -3
If you look in this very well done picture, where the oil pick up tube and sump are in the pan, it sits that low because it is desinged to try to reduce the amount of oil sloshing in the pan under braking. but there is no other method of minimalizing it in this sample. I accually got the pic from the moroso site, they are advertising the extended pick up tubes, a factory set up does not go that deep into the pan! another way of avoiding the pressure drop is to run a dry sump system in your jeep.... good luck!
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Post by creeperjeep on Dec 20, 2004 11:59:20 GMT -3
i'm sorry, i forgot you were a jeep tech...my bad
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Post by jps4jeep on Dec 20, 2004 13:14:09 GMT -3
Nope not a tech, but I probably know more than one. My education came from building rat rods and off-raod trucks. To my building list I got/have/had quite a few vehicles and at least 20 years of getting greasy under the nails!
Except on how to set up a gears. I can do all my own work, I get confused after shimming the damn thing the third time! hehe
Oh and degreeing a cam is not my strong point but I can do it. and decking a block is out, my bridgport is not big enough.
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Post by slab42 on Dec 21, 2004 1:18:39 GMT -3
yeah, and your bumper fluid is getting low... god john, you forgot to mention that you can do wiring properly, unlike 99.3% of mechanics out there! johnny is one of those guys that acts like he knows everything, and is usually right ;D i try not to question him, especially when he is drunk... i try to leave certain things to the people that know them best like when someone tells me that their mechanic looked at their remote start, and told them that it was causing problems, so they rewired it, etc. I ask them if they want me rebuilding their tranny? they usually looked confused, and say no. then i ask them why they want a mechanic looking at their electrical wiring? everyone has their own area of expertise, i know car electronics, others know the mechanical aspecs, i usually try to get help when doing something mechanical that is unfamiliar with me, and my friends who are mechanics get my help with electrical. i still think you should just take out the drain plug, that will prevent the oil from sloshing foward when you are pulling -3 G's after doing the quarter in 8.6 seconds!
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Post by jps4jeep on Dec 21, 2004 9:48:52 GMT -3
yeah, and your bumper fluid is getting low... god john, you forgot to mention that you can do wiring properly, unlike 99.3% of mechanics out there! johnny is one of those guys that acts like he knows everything, and is usually right ;D i try not to question him, especially when he is drunk... i try to leave certain things to the people that know them best like when someone tells me that their mechanic looked at their remote start, and told them that it was causing problems, so they rewired it, etc. I ask them if they want me rebuilding their tranny? they usually looked confused, and say no. then i ask them why they want a mechanic looking at their electrical wiring? everyone has their own area of expertise, i know car electronics, others know the mechanical aspecs, i usually try to get help when doing something mechanical that is unfamiliar with me, and my friends who are mechanics get my help with electrical. i still think you should just take out the drain plug, that will prevent the oil from sloshing foward when you are pulling -3 G's after doing the quarter in 8.6 seconds! ;D So what I accually have fender fluid, and all the haters can kiss my a** (note, after a very deep water crossing, the side markers in my TJ flares let some water in, that was almost two years ago, and still have not emptied it.)
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