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Old 08-05-2010
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Engine Oil Problem Knocking *ENGINE GURU'S READ*

Alright guys on Monday my truck died at a light so we tried jumping it and then got it towed to my house. Well I remember the Cam Positioning Sensor thing and pulled that. Low and behold it is missing half the teeth. Well the engine is not locked up so we replaced it and set it back to where it should be. We started it and there was a light knocking sound coming from the bottom of the engine (BAD) so we turned it off. I pulled the oil pan and checked out the bottom of the engine no scaring or anything like that there was little metal shavings in the oil pan so we cleaned it out made sure the oil pump screen was not clogged and put the oil pan back on and filled her with oil. Started it again this time there was no knocking but now there is a ticking coming from the top which sounded like the passenger side lifters. So we pulled the valve covers off and pulled the rods and rockers they all look fine. So we installed the valve covers back on and started it up was running fine for a few minutes (no noise) so I drove it down the street and it started a VERY light knock only above 1500 RPM's and the oil pressure dropped to zero (I have an aftermarket oil gauge). Turned it off again. Then we were going to move it in the garage and the knocking was gone again and I had oil pressure.

So the knocking is not constant seems to come and go. My question is do you think it could be the oil pump not pumping oil constantly? I am thinking about replacing it tomorrow. Cause when I was driving it down the street it was running so smooth with no noise.
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Old 08-06-2010
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when I bought my truck, we were driving it about 70 down the highway, and I kicked it down to get up a big hill, as I looked down to see how fast I was going, my oil gauge went straight down lol. when I got to the top of the hill, it started knocking.. we thought it was the oil pump, but turned out to be a spun rod bearing. the shavings in the oil are from that. I pulled off at the next exit, (right at the top of the hill) and shut it off. let it cool off, started it back up, it wasnt showing that it built oil pressure, but the knock was FAINT. revved it up a little, and the oil pressure gauge went up, but the knock got slightly louder. I ended up driving it from that exit to a gas station down the road to park it for the night, and it had no knock whatsoever when it was driving.. not sure if you said there WERE shavings in the oil or not, due to confusion of your wording :P lol but if there was, my guess is its definitely a spun rod bearing. hopefully someone else will throw some input out there for you too.
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Old 08-06-2010
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im thinking its a bearing too. you could be having intermitent oil pressure problems from the pump but everytime the pressure drops to zero you have the potential for serious damage
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Old 08-06-2010
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Quote:
Originally Posted by zak873 View Post
when I bought my truck, we were driving it about 70 down the highway, and I kicked it down to get up a big hill, as I looked down to see how fast I was going, my oil gauge went straight down lol. when I got to the top of the hill, it started knocking.. we thought it was the oil pump, but turned out to be a spun rod bearing. the shavings in the oil are from that. I pulled off at the next exit, (right at the top of the hill) and shut it off. let it cool off, started it back up, it wasnt showing that it built oil pressure, but the knock was FAINT. revved it up a little, and the oil pressure gauge went up, but the knock got slightly louder. I ended up driving it from that exit to a gas station down the road to park it for the night, and it had no knock whatsoever when it was driving.. not sure if you said there WERE shavings in the oil or not, due to confusion of your wording :P lol but if there was, my guess is its definitely a spun rod bearing. hopefully someone else will throw some input out there for you too.
Are you sure it was a Rod bearing and not a main bearing? The rod bearing are not force fed oil, unlike the main bearings, which when spun would block the oil port.
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Old 08-06-2010
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Are you sure it was a Rod bearing and not a main bearing? The rod bearing are not force fed oil, unlike the main bearings, which when spun would block the oil port.
how do these engines oil the rod bearings and cylinders?
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Old 08-06-2010
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mechanic told me it was a spun rod bearing.. same with everyone else I asked. no clue though, doesn't really matter what it was except to help this guy out :P lol. ended up thinking it would make it 40 minutes down the road to a motocross track and it locked up on me. oops lol. going to alabama this weekend for a new motor. but, from what I know, and others seemed to know, it was a spun rod bearing. very well could have been the main bearing, but I can't say I'm all that experienced with car/truck motors.
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Old 08-06-2010
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About to go pull the oil pan off again check the bearings and the oil pump. Thanks for the replies
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Old 08-06-2010
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Did you change the oil filter? could be having some pluggage issues.

Sounds like a spun bearing. I cant imagine a bearing kit costing that much. Might just toss all new ones in there.
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Old 08-07-2010
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Thinking its one of the bearings on the crank
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Old 08-08-2010
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If it's a rod bearing and you wan t fix it you really need to machine the crank and put oversized bearings in
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Old 08-08-2010
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sorry ! but you are going to need a crankshaft re-grind

and probably a new oil pump

it would be cheaper in the long run to just have a complete engine rebuild

if there were chunks of metal in the pan ,, then that means the crankshaft have slung the bits into the cylinder walls and put scratches cylinder bores ( not a good thing )

the crankshaft is also a oil slinger as well
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Old 08-13-2010
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Well we are pulling the whole engine tomorrow and getting the short block rebuilt.
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Old 08-27-2010
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Good luck!
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Old 08-27-2010
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Got the long block back and starting the install tomorrow!
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Old 08-27-2010
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Anyone have the proper way of putting the torque converter back onto the tranny?
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Old 08-28-2010
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push the torque converter straight back , twist left then right , the converter will move backwards and you will hear a pop sound.

you cannot miss it , it will only move back once you start twisting it

Last edited by cheese_man; 08-28-2010 at 11:19 AM.
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Old 08-28-2010
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So it will only pop 1 time?

Thanks for your reply
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Old 08-28-2010
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yes only 1 pop you will hear
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