low, then no, oil pressure
01-18-2008, 11:51 PM
#51
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FWIW I had a brand new RED pick up tube O ring and I still had to use a **** load of RTV to get my oil pressure to stay steady. I feel your pain! Between problems with my timing chain and oil pressure I had mine apart and back together 6 times before I was done. Every time I used thread locker and torqued all the bolts so it was definitely time consuming.... Another thing that helped was loosening the pick up tube from the block before tightening it up to the oil pump.
And before you ask, yes I read the entire thread! I'm just posting up what happened to me hopping it might help ya
And before you ask, yes I read the entire thread! I'm just posting up what happened to me hopping it might help ya
01-19-2008, 12:19 AM
#53
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Kevin I'm going through the same thing on a customers Street Rod. It's got a BBC engine that had a broken push rod. I replaced the push rod and everything seemed fine but we should have used a scope to look at the cam. He took it and made it about 8 miles and lost oil pressure. He pulled over when it started valvetrain noise. When we opened it up and found the pushrod off again we looked harder and found a severly flattened lobe. So we pulled the cam and three lobes were going bad. The one lifter was about 1/4" shorter (hydraulic flat tappet). So we looked around and everything else was still in order. We flushed it out and install a new cam and lifters. Now it runs fine but when cold started it has 68 PSI. By the time it warms up to 185* it is 5-10 at low idle and only 45 revved up. I have verified it with a mechanical gauge. The oil pump was fine until he drove it so I don't know but I'm sick of working on it as I don't have time and space for this type of job, it's a 1948 Olds. I don't want to replace the oil pump because I don't think it's the problem. I think it's in the lifter bore from that bad lobe but he's not going to want to hear that after we charged him about $2500 already and he's not had it for a few months now and had just bought it at auction for $13,000.
Anyways we have the same problem in very similar engines and with very similar circumstances that led upto it. Just thought I'd share that since reading your thread has about confirmed my fears.
See you at RX7 Club
Vernon
Anyways we have the same problem in very similar engines and with very similar circumstances that led upto it. Just thought I'd share that since reading your thread has about confirmed my fears.
See you at RX7 Club
Vernon
01-19-2008, 12:54 AM
#55
FWIW I had a brand new RED pick up tube O ring and I still had to use a **** load of RTV to get my oil pressure to stay steady. I feel your pain! Between problems with my timing chain and oil pressure I had mine apart and back together 6 times before I was done. Every time I used thread locker and torqued all the bolts so it was definitely time consuming.... Another thing that helped was loosening the pick up tube from the block before tightening it up to the oil pump.
And before you ask, yes I read the entire thread! I'm just posting up what happened to me hopping it might help ya
And before you ask, yes I read the entire thread! I'm just posting up what happened to me hopping it might help ya
Sealing a pickup tube to an oilpump or block should not be rocket science.
01-19-2008, 12:57 AM
#56
Kevin I'm going through the same thing on a customers Street Rod. It's got a BBC engine that had a broken push rod. I replaced the push rod and everything seemed fine but we should have used a scope to look at the cam. He took it and made it about 8 miles and lost oil pressure. He pulled over when it started valvetrain noise. When we opened it up and found the pushrod off again we looked harder and found a severly flattened lobe. So we pulled the cam and three lobes were going bad. The one lifter was about 1/4" shorter (hydraulic flat tappet). So we looked around and everything else was still in order. We flushed it out and install a new cam and lifters. Now it runs fine but when cold started it has 68 PSI. By the time it warms up to 185* it is 5-10 at low idle and only 45 revved up. I have verified it with a mechanical gauge. The oil pump was fine until he drove it so I don't know but I'm sick of working on it as I don't have time and space for this type of job, it's a 1948 Olds. I don't want to replace the oil pump because I don't think it's the problem. I think it's in the lifter bore from that bad lobe but he's not going to want to hear that after we charged him about $2500 already and he's not had it for a few months now and had just bought it at auction for $13,000.
Anyways we have the same problem in very similar engines and with very similar circumstances that led upto it. Just thought I'd share that since reading your thread has about confirmed my fears.
See you at RX7 Club
Vernon
Anyways we have the same problem in very similar engines and with very similar circumstances that led upto it. Just thought I'd share that since reading your thread has about confirmed my fears.
See you at RX7 Club
Vernon
I really find it hard to believe that the lifter bore/block is the issue here. I did smooth the bore out a little bit but it was not bad at all. The lifter had not siezed up in it. IT still moved freely, just the bottom was flattened and it wouldnt come out. Since I had tried to pull it up with pliers, I figured the bottom edge of the lifter bore might have a burr or 2 on it and smoothed it out until a new lifter moved freely inside. I can't see the iron block being deformed enough to dump 30psi of oil pressure out of that one lifter bore.
Engine is coming out, so I will know in a couple of days I guess.
01-19-2008, 04:44 AM
#57
ya wont know if the red o ring sealed by pulling the motor unless youre ganna start it on the ground .i would be certain of this b4 i pull it it def sounds like it .id take a few min and pull the pan replace that oring with alittle lube on it so it slides on the flange ,and pack that oil pump with grease before u put it back 2 gether no matter what so you dont get a dry ****,or start,thatll fool ya .ittl mess with youre oil pressure like hell.just my offering.take it whatever way u want,and yes it took 3 time b4 i got it right.
01-19-2008, 10:08 AM
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Wow, what are the odds of another rx7club member on a v8 forum.
I really find it hard to believe that the lifter bore/block is the issue here. I did smooth the bore out a little bit but it was not bad at all. The lifter had not siezed up in it. IT still moved freely, just the bottom was flattened and it wouldnt come out. Since I had tried to pull it up with pliers, I figured the bottom edge of the lifter bore might have a burr or 2 on it and smoothed it out until a new lifter moved freely inside. I can't see the iron block being deformed enough to dump 30psi of oil pressure out of that one lifter bore.
Engine is coming out, so I will know in a couple of days I guess.
I really find it hard to believe that the lifter bore/block is the issue here. I did smooth the bore out a little bit but it was not bad at all. The lifter had not siezed up in it. IT still moved freely, just the bottom was flattened and it wouldnt come out. Since I had tried to pull it up with pliers, I figured the bottom edge of the lifter bore might have a burr or 2 on it and smoothed it out until a new lifter moved freely inside. I can't see the iron block being deformed enough to dump 30psi of oil pressure out of that one lifter bore.
Engine is coming out, so I will know in a couple of days I guess.
I really hope this issue is something simple and I can check it out whatever you find and find the same thing on my problem case. I'll be following your progress for this reason.
Good luck,
Vernon
