No Oil Pressure in rebuilt 1970 455
#1
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No Oil Pressure in rebuilt 1970 455
I recently rebuilt my 455 and when I started it up, I found I was getting zero oil pressure. Shut it down to investigate, but not sure why. Priming the oil pump sends oil through the filter but not getting anything up higher. I had the crank turned and new bearings installed at a machine shop. Any thoughts before I pull it back out? Thanks.
#2
I recently rebuilt my 455 and when I started it up, I found I was getting zero oil pressure. Shut it down to investigate, but not sure why. Priming the oil pump sends oil through the filter but not getting anything up higher. I had the crank turned and new bearings installed at a machine shop. Any thoughts before I pull it back out? Thanks.
Last edited by joe_padavano; May 20th, 2008 at 06:43 AM. Reason: Typo
#3
About that oil plug
I checked the 1966 service manual, and got this text:
Note that this is applicable to the 425ci engine, so the normal 425 vs. 455 caveats apply.
The [left hand rear oil galley plug] is a threaded plug in the end of the left galley just forward of the distributor. A small hole is provided in the plug for distributor lubrication. The cup plug shown provides access to the threaded plug
And there is a picture (attached).Note that this is applicable to the 425ci engine, so the normal 425 vs. 455 caveats apply.
#4
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Thanks guys, that makes a lot of sense. My first rebuild and I guess I just missed it. Never saw anything about it in the books I had. Unfortunately it sounds like I still have to pull the motor again, but at least now I have an idea of where to focus. Thanks again!
#6
There are also 2 plugs behind timing chain cover. One with a pinhole for timing chain oiling and the other just a plug. If these were left out you would not necessarily have to pull the engine only the timing chain....with the rear one I think you could do the job by removing the trans.
#7
There are also 2 plugs behind timing chain cover. One with a pinhole for timing chain oiling and the other just a plug. If these were left out you would not necessarily have to pull the engine only the timing chain....with the rear one I think you could do the job by removing the trans.
#8
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Yeah, it's coming out. I want to check my mains. I am hoping that because I had oil to the filter, that the mains were getting oil. I will check the rear plugs first and then check behind the timing chain cover if needed. Got everything disconected this morning and will hopefully have it out tomorrow. Will let ya'll know what I find. Thanks again!
#9
Yes the engine should come out and all apart to be sure...I had a similar situation with a 394 that was supposed to be rebuilt but never started. It was in the 59 I bought...I started it and had no oil to the top of the engine. Ran like crap for a few minutes. Checked oil pressure and had about 4psi...just enough to keep the dash light off. Found the front 2 oil galley plugs missing...the rear one was there....Am not pulling it though as all seems well now....will take my chances and when/if it starts knocking it will be time to pull it....
#11
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Hey guys, I wanted to say thanks for the advice and for the tech tips. I found the culprit, or culprits as it were. The two galley plugs in the front did not get put back in when it came back from the machine shop. Since I didn't pull them, it didn't even dawn on me that there was something missing when I put the cam, timing chain and cover on. Rookie mistake. Good news is that I checked the bearings and they were good, I put the plugs in and put the motor back in and it's running fine now with good oil pressure. A few more pieces parts to hook up and it should be back on the street. Thanks again!
#12
I checked the 1966 service manual, and got this text:
Note that this is applicable to the 425ci engine, so the normal 425 vs. 455 caveats apply.
The [left hand rear oil galley plug] is a threaded plug in the end of the left galley just forward of the distributor. A small hole is provided in the plug for distributor lubrication. The cup plug shown provides access to the threaded plug
And there is a picture (attached).Note that this is applicable to the 425ci engine, so the normal 425 vs. 455 caveats apply.
#13
What I normal due after a rebuild, is while primimg the motor I hook up a spare oil pressure gauge so I can keep an eye on it while primimg. I also look down the dist hole to make sure the dist oiler is squirting. I do this on the stand before I install it. Been there done that. JKaz
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