20PSI oil pressure in rebuilt motor.
11-18-2008, 07:58 PM
#41
20w 50????? why the hell are you running such a thick oil? you know that 5w 30 and 20w 50 have the same viscosity at operating temps? the difference is at start up where motors take the most wear and a 20w 50 is waaaaaaay to thick man you need to read this ASAP http://ferrarichat.com/forum/showthread.php?t=136052 and change your oil type soon
11-19-2008, 08:32 AM
#42
12 Second Club
iTrader: (4)
Join Date: Jan 2004
Location: NJ
Posts: 929
Likes: 0
Received 0 Likes
on
0 Posts
^^SM is right as I understand it. Then the oil pump spins faster as rpm's rise and OP picks up. I have seen cars run tens of thousnds of miles like this so there is no way to tell.
As long as your oil pressure is decent you should be ok for a while. You prolly know this but a rough rule of thumb is 10psi per 1000 rpms.
As long as your oil pressure is decent you should be ok for a while. You prolly know this but a rough rule of thumb is 10psi per 1000 rpms.
11-19-2008, 05:25 PM
#43
finally got around to tearing it back down today. The o ring looked perfect and the retainer plate was tightened all the way down. Does that little gasket on the backside of the plate ever go bad? Also does anyone have any pictures of which way that little gasket behind the cam sprocket goes?
11-19-2008, 06:31 PM
#44
Well it doesnt drop then pick up when I rev it up....I changed the oil and filter. The oil looked good. Had some small metal shavings on the oil drain plug, not big chunks or anything. Just look like a new motor breaking in.
But the pressure is still low. Im going to hook up a mechanical guage just to rule that out before I tear into the motor again. But I'm leaning towards the o-ring or the pick-up tube not sealing on the pump good, I do have some bubbles on the dipstick so I guess thats a sign of air in the oiling system from something.
But the pressure is still low. Im going to hook up a mechanical guage just to rule that out before I tear into the motor again. But I'm leaning towards the o-ring or the pick-up tube not sealing on the pump good, I do have some bubbles on the dipstick so I guess thats a sign of air in the oiling system from something.
11-19-2008, 07:29 PM
#46
finally got around to tearing it back down today. The o ring looked perfect and the retainer plate was tightened all the way down. Does that little gasket on the backside of the plate ever go bad? Also does anyone have any pictures of which way that little gasket behind the cam sprocket goes?
11-19-2008, 10:27 PM
#48
Staging Lane
Join Date: Oct 2008
Location: DALLAS TX
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
start simple, take off oil pan and inspect pick up tube. check for cracks in it, and be sure the seal is good. a machinist should know a lot about bearing clearances, using micrometers and so on. i would suspect pick up tube or faulty pump. that is if you have a lot of faith in your mechanic.
11-19-2008, 10:45 PM
#49
start simple, take off oil pan and inspect pick up tube. check for cracks in it, and be sure the seal is good. a machinist should know a lot about bearing clearances, using micrometers and so on. i would suspect pick up tube or faulty pump. that is if you have a lot of faith in your mechanic.
11-19-2008, 11:56 PM
#50
TECH Enthusiast
iTrader: (51)
Join Date: Jul 2008
Location: Billings, Mt
Posts: 616
Likes: 0
Received 0 Likes
on
0 Posts
start simple, take off oil pan and inspect pick up tube. check for cracks in it, and be sure the seal is good. a machinist should know a lot about bearing clearances, using micrometers and so on. i would suspect pick up tube or faulty pump. that is if you have a lot of faith in your mechanic.
11-25-2008, 10:40 PM
#51
UPDATE:
I finally got a mechanical guage on it. I drilled and tapped the piece thats above the oil filter. The oil was moving so slow that it barely made it to the guage its self. When it di, it was showing what the car shows.. around 20psi COLD. I have changed the oil pump, and put a new o-ring on it. By the way the old o-ring looked fine to me, no tears or deformities. The cam retainer plate is on and tight, and the gasket on the back of it looks fine. Whats next? I know that the oil plug is in the back of the block, but is it possible that when I squished on it, it could have blew it out? Thats my next step....pull the transmission and have a look see back there.
I just dont see it spinning a bearing. I have seen many bearings spun and never seen a drop in oil pressure like this. Its like it is just bypassing the pump all together somehow? Anyone with anymore ideas I would truely appreciate it. Thanks again guys...
I finally got a mechanical guage on it. I drilled and tapped the piece thats above the oil filter. The oil was moving so slow that it barely made it to the guage its self. When it di, it was showing what the car shows.. around 20psi COLD. I have changed the oil pump, and put a new o-ring on it. By the way the old o-ring looked fine to me, no tears or deformities. The cam retainer plate is on and tight, and the gasket on the back of it looks fine. Whats next? I know that the oil plug is in the back of the block, but is it possible that when I squished on it, it could have blew it out? Thats my next step....pull the transmission and have a look see back there.
I just dont see it spinning a bearing. I have seen many bearings spun and never seen a drop in oil pressure like this. Its like it is just bypassing the pump all together somehow? Anyone with anymore ideas I would truely appreciate it. Thanks again guys...
11-27-2008, 09:54 AM
#53
Staging Lane
Join Date: Mar 2006
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
dude i had the same issue and it was a cam bearinf that walked our exposing the oil gallery. i asked if others heard of this but got only surprise. at least one other person now said that happened. anyway check it out.
11-27-2008, 12:48 PM
#54
Banned
iTrader: (2)
Join Date: Sep 2008
Location: DFW
Posts: 113
Likes: 0
Received 0 Likes
on
0 Posts
had the same motor, they ended up building it to tight. and i spun a rod. re did it again and put in a melling oil pump ( ported ls6 before)
and 15w50 race oil
works perfect.
low oil pressure is NOT a good thing.
and 15w50 race oil
works perfect.
low oil pressure is NOT a good thing.
11-30-2008, 02:55 AM
#56
Teching In
iTrader: (1)
Join Date: Nov 2006
Location: Illinois
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
you change the oil filter i assume?
thicker oil if anyhting will give you MORE pressure than a thin oil. use it all the time on older engines to help put more of a buffer between parts.
but on a new engine it might have done somethign to the oil pump. possibly breaking the pressure relief spring. keepin the pump in bleed off mode so to speek all the time not allowing it to build pressure.
thicker oil if anyhting will give you MORE pressure than a thin oil. use it all the time on older engines to help put more of a buffer between parts.
but on a new engine it might have done somethign to the oil pump. possibly breaking the pressure relief spring. keepin the pump in bleed off mode so to speek all the time not allowing it to build pressure.
11-30-2008, 03:15 PM
#58
Staging Lane
Join Date: Nov 2006
Posts: 64
Likes: 0
Received 0 Likes
on
0 Posts
"I know that the oil plug is in the back of the block, but is it possible that when I squished on it, it could have blew it out? Thats my next step....pull the transmission and have a look see back there. "
I knocked mine out trying to get my pilot bearing out and i had no change in oil pressure just an oil leak and trust me you will know without pulling the transmission.... BTW id let the engine builder take car of this problem...Have you contacted them? What did they say? I wouldndt be supised to that initial heavy oil to have caused some damage to some bearings on the first startup!
I knocked mine out trying to get my pilot bearing out and i had no change in oil pressure just an oil leak and trust me you will know without pulling the transmission.... BTW id let the engine builder take car of this problem...Have you contacted them? What did they say? I wouldndt be supised to that initial heavy oil to have caused some damage to some bearings on the first startup!
Last edited by 00_STANG_KILLER; 11-30-2008 at 03:32 PM.
11-30-2008, 08:50 PM
#59
"I know that the oil plug is in the back of the block, but is it possible that when I squished on it, it could have blew it out? Thats my next step....pull the transmission and have a look see back there. "
I knocked mine out trying to get my pilot bearing out and i had no change in oil pressure just an oil leak and trust me you will know without pulling the transmission.... BTW id let the engine builder take car of this problem...Have you contacted them? What did they say? I wouldndt be supised to that initial heavy oil to have caused some damage to some bearings on the first startup!
I knocked mine out trying to get my pilot bearing out and i had no change in oil pressure just an oil leak and trust me you will know without pulling the transmission.... BTW id let the engine builder take car of this problem...Have you contacted them? What did they say? I wouldndt be supised to that initial heavy oil to have caused some damage to some bearings on the first startup!
