i have a serious question....
#1
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Join Date: Nov 2008
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i have a serious question....
alright, my motor started knockin the other day, every thing is new though bearings rods pistons and all, so i pulled the motor and found that three of the oil punp bolts had vibated all the way out, meaning that thee was only one left holding it together, so i put some lock tight on them and put everything back together.
heres he question
can the oil pump cause the knocking i was hearing?
heres he question
can the oil pump cause the knocking i was hearing?
#3
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RACING JUNKIE
Join Date: May 2006
Posts: 2,044
Oh boy does this post bring back some bad memories, I had a similar experience except mine ended in a destroyed engine. They were probably just lose from the oil pump manufactor (melling of mexico).
Since then I always remove the oil pump cover bolts and generously use red loctite on them. NOTE: They're usually lose or close to it.
The knocking probably was due to the loss of oil pressure, motors tend to do that when they dont have any oil pressure.
I also reccomend a great big low oil pressure warning light positioned at EYE level, another thing I learned tearing that motor up, no oil pressure kills motors in a hurry.
Goodluck, Cp
Since then I always remove the oil pump cover bolts and generously use red loctite on them. NOTE: They're usually lose or close to it.
The knocking probably was due to the loss of oil pressure, motors tend to do that when they dont have any oil pressure.
I also reccomend a great big low oil pressure warning light positioned at EYE level, another thing I learned tearing that motor up, no oil pressure kills motors in a hurry.
Goodluck, Cp
#4
Re: i have a serious question....
Originally Posted by bowhay
heres he question
can the oil pump cause the knocking i was hearing?
can the oil pump cause the knocking i was hearing?
Curtis
#5
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yes the rotating assembly was balanced
and i checked the mains and few of the rod bearings and they all looked good
it almost sounded like the pump was rattleing around and hitting the oil pan
its a 350 sbc bored and stroked to a 385
and i checked the mains and few of the rod bearings and they all looked good
it almost sounded like the pump was rattleing around and hitting the oil pan
its a 350 sbc bored and stroked to a 385
#6
Bowhay,
I hope that didn't sound like a smart*** answer. How long did this motor run? Glad you could hear it over the exaust. If you don't mind who's pump was this? I have always taken apart new pumps and checked the gear clearance to cap dimension making sure it is .002-.003. I run a machine shop so I know how guys will let tolerances wander. I hope nothing was hurt in your motor.
Curtis
I hope that didn't sound like a smart*** answer. How long did this motor run? Glad you could hear it over the exaust. If you don't mind who's pump was this? I have always taken apart new pumps and checked the gear clearance to cap dimension making sure it is .002-.003. I run a machine shop so I know how guys will let tolerances wander. I hope nothing was hurt in your motor.
Curtis
#7
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it was just a stock replacement gm high volume pump
was intstalled about a year ago, and i just put it back in
i didnt check the clearance but i didnt think it was necessary beacuase it had run for the entire time that i have had the truck
i really dont know
i just hope that when i get all the electrical hooked back up i can start the motor and it wont knock
was intstalled about a year ago, and i just put it back in
i didnt check the clearance but i didnt think it was necessary beacuase it had run for the entire time that i have had the truck
i really dont know
i just hope that when i get all the electrical hooked back up i can start the motor and it wont knock
#8
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JUNIOR BUILDER
Join Date: Feb 2008
Location: Childers Australia
Posts: 98
Originally Posted by doorracer
Bowhay,
I hope that didn't sound like a smart*** answer. How long did this motor run? Glad you could hear it over the exaust. If you don't mind who's pump was this? I have always taken apart new pumps and checked the gear clearance to cap dimension making sure it is .002-.003. I run a machine shop so I know how guys will let tolerances wander. I hope nothing was hurt in your motor.
Curtis
I hope that didn't sound like a smart*** answer. How long did this motor run? Glad you could hear it over the exaust. If you don't mind who's pump was this? I have always taken apart new pumps and checked the gear clearance to cap dimension making sure it is .002-.003. I run a machine shop so I know how guys will let tolerances wander. I hope nothing was hurt in your motor.
Curtis
#9
I just added the part about checking the clearance as a std. course of prep that I do on a new pump. This also makes sure the bolts are tight when I put it back together. Sounds like the bolts must have been a little loose and I have heard that high volume pumps will the possibility of chatter or vibration. Not sure how true that is just things that I have heard through the years. I never run a high volume pump myself in a SBC, have never found the need for it with the clearances we run. I hope it doesn't knock also. Good luck.
Curtis
Curtis