70 455 Spun Bearing?

Topless72 · 03-30-2008, 08:55 PM

I was running my 70 455 442 down the highway at about 3300 RPM when the oil pressure dropped to about 0 and rapping started. No overheating occurred. I had it towed home and started it. It rapped at start but stopped as pressure was back at 50 psi. After a bit I could hear it starting slightly again getting worse as time went on. Is a bearing spun? Can I replace them from under the car by removing the oil pan?

Oldsguy · 03-31-2008, 05:47 AM

Do you have an oil pressure gauge? This would help you determine if a bearing has been damaged but it certainly does seem like it from your description.

Rallye469 · 03-31-2008, 06:29 AM

That or a collapsed lifter?
Nah, it sounds like a bearing.

Get used to the idea of pulling your engine. You're only kidding yourself if you think you can get it done from underneath.
You might have to cut the crank a bit.
How many miles are on it?

Topless72 · 03-31-2008, 09:59 AM

Pressure was running 3K psi and then dropped to 0 when rod rapped.

After total cooling and re-start, pressure was up to 50 psi and as car warmed up, I could here it starting again when revving the engine.

At idle, oil pressure is still at 30 - 50 psi

Redog · 03-31-2008, 04:18 PM

Does it sound like this?

When the 307 spun it's bearing

It's cure, a new engine, but it was a 307, not worth rebuliding

Topless72 · 03-31-2008, 04:24 PM

Nowhere near as bad as that.......

71 delta88guy · 04-01-2008, 04:23 PM

2 things you can do to get some idea. first, pull the oil filter cut appart and look for metal fragments ,pieces of bearing. 2 drain oil and look for metalic swirl when oil goes into drainbucket. Sounds like an engine pull is only answer.

Oldsguy · 04-02-2008, 04:57 AM

Wow, now you just ruined my morning! After listening to that I am going to feel sort of sick in my gut all morning long........

70oldsW30 · 04-09-2008, 11:47 AM

Oh geez. This reminds me of when I let my oldest son drive my '70 SX while his car was in the shop being painted. It had only a few thousand miles on a new motor. He called me on his cell phone from his buddies house saying "Hey dad, your car is making this really weird noise. Listen!" I have no idea how long I futilely screamed "Shut it off!!" as he held his cell phone out towards the running, knocking car so I could hear it real good.

03-30-2008, 08:55 PM	#1 (permalink)
Topless72 Senior Member Join Date: Dec 2007 Location: Palm City, FL Posts: 99	70 455 Spun Bearing? I was running my 70 455 442 down the highway at about 3300 RPM when the oil pressure dropped to about 0 and rapping started. No overheating occurred. I had it towed home and started it. It rapped at start but stopped as pressure was back at 50 psi. After a bit I could hear it starting slightly again getting worse as time went on. Is a bearing spun? Can I replace them from under the car by removing the oil pan? __________________

03-31-2008, 05:47 AM	#2 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,857	Do you have an oil pressure gauge? This would help you determine if a bearing has been damaged but it certainly does seem like it from your description. __________________ Dan '46 2 door

03-31-2008, 06:29 AM	#3 (permalink)
Rallye469 Senior Member Join Date: Feb 2008 Posts: 223	That or a collapsed lifter? Nah, it sounds like a bearing. Get used to the idea of pulling your engine. You're only kidding yourself if you think you can get it done from underneath. You might have to cut the crank a bit. How many miles are on it? __________________ '70 Rallye 350 '65 F-85 http://www.youtube.com/watch?v=CCw-JmwNGZQ

03-31-2008, 09:59 AM	#4 (permalink)
Topless72 Senior Member Join Date: Dec 2007 Location: Palm City, FL Posts: 99	Pressure was running 3K psi and then dropped to 0 when rod rapped. After total cooling and re-start, pressure was up to 50 psi and as car warmed up, I could here it starting again when revving the engine. At idle, oil pressure is still at 30 - 50 psi __________________

03-31-2008, 04:18 PM	#5 (permalink)
Redog Alero Chapter Secretary Join Date: Aug 2006 Location: Newtown, PA Posts: 696	Does it sound like this? When the 307 spun it's bearing It's cure, a new engine, but it was a 307, not worth rebuliding __________________ Me 2000 Alero running 14's 1985 Delta 88 w/1968 350 rocket 2005 Nissan Altima (her's)

03-31-2008, 04:24 PM	#6 (permalink)
Topless72 Senior Member Join Date: Dec 2007 Location: Palm City, FL Posts: 99	Nowhere near as bad as that....... __________________

04-01-2008, 04:23 PM	#7 (permalink)
71 delta88guy Member Join Date: Oct 2006 Posts: 55	2 things you can do to get some idea. first, pull the oil filter cut appart and look for metal fragments ,pieces of bearing. 2 drain oil and look for metalic swirl when oil goes into drainbucket. Sounds like an engine pull is only answer.

04-02-2008, 04:57 AM	#8 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,857	Wow, now you just ruined my morning! After listening to that I am going to feel sort of sick in my gut all morning long........ __________________ Dan '46 2 door

04-09-2008, 11:47 AM	#9 (permalink)
70oldsW30 Member Join Date: Apr 2008 Location: houston Posts: 35	Oh geez. This reminds me of when I let my oldest son drive my '70 SX while his car was in the shop being painted. It had only a few thousand miles on a new motor. He called me on his cell phone from his buddies house saying "Hey dad, your car is making this really weird noise. Listen!" I have no idea how long I futilely screamed "Shut it off!!" as he held his cell phone out towards the running, knocking car so I could hear it real good.

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