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Old 06-04-2009, 09:54 PM   #1
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No oil pressure (new oil pump already)

ok i replaced the old oil pump, oil filter, and the oil. I also took the oil pan off and clean all the internal parts and the rockers as well as the pins. after putting everything together, it cranks easily (just like new). but still no oil pressure. You can hear ticking but not really any knocking HELPPPPPP PLEASEEE!!!

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Old 06-04-2009, 10:04 PM   #2
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new pressure gauge? the sending units like to fail. i put a mechanical oil pressure gauge in mine so that i always know my actual oil pressure.

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Old 06-04-2009, 10:21 PM   #3
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would that cause ticking under the value cover. The oil pump good and how hard was it to install mechanical guage?
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Old 06-04-2009, 10:21 PM   #4
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As suggested where you posted this up on JF, have you replaced the oil pressur sender? That's the most common cause of a low/zero oil pressure reading on your gauge.
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Old 06-05-2009, 01:26 AM   #5
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Check your sending unit and wire to make sure it is connected.
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Old 06-05-2009, 02:59 PM   #6
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Well if you are getting lifter ticking then you might honestly not be getting any oil pressure. However as the others have said I would also replace the sending unit first on the passenger side of the block.
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Old 06-06-2009, 03:29 PM   #7
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ok i replaced the sending unit. And Now the oil pressure jumps from 0 to 20 when i give it alittle gas but at idle, it returns to zero. So i took the value cover off. Then started the engine, all rockers where moving but some would shoot oil and others wouldn`t. i`m not sure what to do now.
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Old 06-06-2009, 06:42 PM   #8
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OK, This is whats happing as of now i still have a tickin nosie under the value cover plus now the I'm hearing knocking sound. Buddy of mind told me crankshaft bearings are out. Does any one know how to replace these or around how much it cost to do so?
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Old 06-06-2009, 10:05 PM   #9
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no point in replacing the main bearings. everything else is half dead now because of not having oil. it would be easier and probably cheaper to just replace the motor. to replace the bearings you basically have to remove the head, remove the rods and pistons, then remove the crank. since your getting a knock, you have a spun bearing and the block needs to be cut and probably the crank/rods and bigger bearings fitted. you would also probably need new cam bearings and a cam and rockers and ....... yeah just replace the motor and save yourself the headache of trying to rebuild your current one. think of it this way, perfect time to shove a v8 in it lol.
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Old 06-07-2009, 12:20 AM   #10
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Quote:
Originally Posted by newagecustoms View Post
OK, This is whats happing as of now i still have a tickin nosie under the value cover plus now the I'm hearing knocking sound. Buddy of mind told me crankshaft bearings are out. Does any one know how to replace these or around how much it cost to do so?
you might get away with a lower end overhaul however if your not a experienced mechanic u may want to look into a engine
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Old 06-07-2009, 01:29 AM   #11
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no point in replacing the main bearings. everything else is half dead now because of not having oil. it would be easier and probably cheaper to just replace the motor. to replace the bearings you basically have to remove the head, remove the rods and pistons, then remove the crank. since your getting a knock, you have a spun bearing and the block needs to be cut and probably the crank/rods and bigger bearings fitted. you would also probably need new cam bearings and a cam and rockers and ....... yeah just replace the motor and save yourself the headache of trying to rebuild your current one. think of it this way, perfect time to shove a v8 in it lol.
If it spun a bearing do you think it would even move anymore?

Also why not suggest dropping the pan and seeing what can be seen. The main bearings etc.... can be taken out from underneath without pulling the motor.
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Old 06-07-2009, 01:59 AM   #12
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you might have smeared a main bearing i would drop the pan and drop all the main cap not all at the same time and drop all the rod caps and see what the bearings look like
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Old 06-07-2009, 03:42 PM   #13
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If you drop the pan you can try to move each main bearing cap back and forth by hand to find the one thats bad, if the crank isn't scared you might be able to put an oversize bearing in. Did this to my buddys jeep and has been fine. But if your crank is scared then you want to start looking for a new engine.
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Old 06-07-2009, 03:56 PM   #14
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His crankshaft might be scared? What does a crankshaft have to fear?
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Old 06-07-2009, 05:24 PM   #15
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How would you know if the crank is scared? .... I took the oil pan off today and one at a time i took the rod bearings out and check them out they look fine i assume i mean there wasnt any chips missing or any damge done. After putting them back together. I started on the main bearings and they were the same. I must be not doing something right. As far as the cam shaft i`m thinking i can take the front bumper and radiator off and that would make it easier to remove the cam shaft instead of removing the motor. Any one tried this or any other ideas?
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Old 06-07-2009, 05:30 PM   #16
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Would i Have to replace the cam bearings? I mean would that cause low oil pressure or knocking?
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Old 06-07-2009, 05:41 PM   #17
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Would i Have to replace the cam bearings? I mean would that cause low oil pressure or knocking?
unlikely the next step would be to check the main and rod bearing clearance with plastigage
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Old 06-07-2009, 06:45 PM   #18
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Wow - "a buddy says" - without any type of diagnosis.
And posters assume the crank is shot - without any basis.

Are these dealer "mechanics?" Sure sounds like it.

You replaced the sending unit - good, but how do you know it's a good one? I'd install a mechanical gauge - even if not permanent, just to verify it's not an electronic sender/gauge/wiring/PCM fault. They are cheap - especially compared to a new motor.

The oil - what is it - how thick or thin, and how long has it been in there? Are you a recent new owner? Filter, how long, what kind? Sludge?

When you took the bottom end loose - how was the oil pump screen? Plugged, full of butterflies?

Some folks get a kick out of suggesting a new motor, yet when they have a problem they don't throw big costly parts at it! They like spending YOUR money.

What would you do if you went to a doctor with a runny nose, and without any tests, and he said you needed a heart transplant?

No wonder the crankshaft is scared!

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