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Old 07-19-2016, 07:12 AM   #57
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Oil pickup

So then I doubt it's the pick up because the oil pressure stays low when the engine is at operating temp
Even when I did the oil changes, when the engine was warm, when the "cool" oil was in, and engine started the pressure would come up a little maybe from 15 up to 20 but not like the 60psi when it's cold!
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Old 07-19-2016, 12:06 PM   #58
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I don't know how many miles or hours of operation this engine has.
It is over 30 years old. If I had the kind of oil pressure readings you are getting I would keep driving.
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Old 10-15-2016, 04:59 AM   #59
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Oil pump question

I've taken the RV on a few short 5 to 6 mile highway trips
oil temperature and pressure still seems to be a little high in the temperature side and Low on the pressure side
I am wondering what to expect when I pull the oil pump.
I did a oil pump on a ford FE engine and the oil pump is run by the distributor is that the way it is on this for the 454, and I'd like to ask again on any thoughts about the oil pump replacement should I use a high volume pump or a high-pressure pump? Will I need to prime the pump before or after I put it on ? If so how do I do that?
If I do get the nerve to take it home and drop the pan and replaced the pump, I will definitely get another oil analyst done
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Old 10-15-2016, 06:14 AM   #60
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I would pull the pan and check the mains and rod bearings, a new oil pump won't help if bearings are worn....
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Old 10-15-2016, 01:03 PM   #61
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What do you consider low pressure?

Does your dash gauge provide a reliable and accurate reading?

If the pressure actually is low, changing the pump probably wont help the root problem, but if I were to do this I would go high volume only, never mind the high pressure.

That said, even if your pressure is marginally low, sometimes engines with marginal oil pressure last a very long time.


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Old 10-15-2016, 04:11 PM   #62
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It is probably the spring in the pump got to hot and lost some of it temper .
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Old 10-15-2016, 05:12 PM   #63
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I think your engine has a filter bypass spring and plunger built into the block at the filter flange. It is there to make sure that your engine gets oiled even if the filter is plugged and probably opens when the oil is cold and thick. It also regulates the oil pressure. I'd bet that a piece of crud got loose when the engine got hot and got caught in the plunger bore jamming the plunger. The engine will probably run for a very long time this way but if you want to fiddle with it I'd first check that plunger. Could there be another spot like the oil cooler bypass that got plugged with some crud? Start simple and maybe keep it that way! Waste of time and horsepower to put in a high volume pump, Chevy engineers are hard to second guess. Put 2,000 miles on oil and filter then send sample for analysis. I'd just get towing plan and not worry about it if it was me. Then again, I was told that the Aliens picked me because they liked my sense of humor!
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Old 10-15-2016, 08:38 PM   #64
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I meant the spring in the pump
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Old 10-16-2016, 01:46 AM   #65
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Low oil pressure, after overheating

In a 454 the pressure relief valve is in the oil pump, the filter bypass will have no affect on pressure, and the oil cooler bypass will have no affect on pressure unless it is stuck closed and the oil gets very hot.

An oil pump is kinda like a thermostat in that when there is a problem with their respective systems this is the first thing people want to change, but changing them out seldom fixes the complaint.

If the oil pressure is indeed actually low, the problem is going to almost always be in the main, rod, or cam bearings.

HOWEVER, a kinda common cause can be sludge or debris clogging the oil pump pickup screen, but this is more common on late model vehicles that use a tiny little pickup as opposed to the large 454 pickup.


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Old 10-16-2016, 06:54 AM   #66
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Quote:
Originally Posted by Grosspoluter View Post
I've taken the RV on a few short 5 to 6 mile highway trips
oil temperature and pressure still seems to be a little high in the temperature side and Low on the pressure side
I am wondering what to expect when I pull the oil pump.
I did a oil pump on a ford FE engine and the oil pump is run by the distributor is that the way it is on this for the 454, and I'd like to ask again on any thoughts about the oil pump replacement should I use a high volume pump or a high-pressure pump? Will I need to prime the pump before or after I put it on ? If so how do I do that?
If I do get the nerve to take it home and drop the pan and replaced the pump, I will definitely get another oil analyst done
You mentioned earlier that your coolant temp is 186? That seems normal, controlled by the thermostats. You also mentioned that the initial overheat was related to a reversed fan belt, and occurred at freeway speed.

1. Did you really keep close track of the oil pressure readings before this happened? I've driven vehicles with low oil pressure (15 at idle, 40 at speed) for years without an issue. Is it possible the pressure was already low? It IS an old engine.

2. I've lost fan belts and fan clutches before, and nothing happened at speed. Didn't notice til I was idling. I wonder how bad your overheat really was?

3. The only oil analysis I ever had done was in my airplane. They are great but on most old motors there's so much crap in there that if you haven't been doing them all along it is hard to determine what changed. I have old cars (flathead and FE Fords) and I've actually had the pans down and it's the only way to really clean them out, but you'll never get everything out by just dropping the pan. The other thing that happens with old cars is people love to walk right up and argue about oil. Most have never actually been inside of an engine.

If this motor was in any of my commuting vehicles I would run it with regular oil and not worry. I know it's an RV though so the possibility of being stranded is real. I've seen guys spend hours and hours underneath, putting in high volume pumps etc etc to fix oil pressure issues only to end up with the same low pressure after they worked on it. In my younger days I ran my Torino with a blown radiator until the engine locked up. Put in a new radiator and ran it for two more years, oil light came on sometimes at low idle.

Good luck, wish I lived closer, I would go for a ride with you and listen real close to that big block. Wouldn't be surprised if you are OK. Keep us posted!
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Old 10-17-2016, 01:42 AM   #67
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Readings & keeping track

I did put all new gauges in the RV because I did not trust the original dashboard gauges I have video of the gauges and temperatures of when I was running it and what speeds
So I have records of the readings before and after the incident The before and after readings I'm about to list are as close to outside temperature and speed as possible before the incident On 65 day at 55 miles an hour water temperature was at 149 trans temperature was at 120 oil temperature was at 202 oil pressure was at 61 voltage was at 14.4
After the incident on a 65 day going 60 miles an hour water temperature was at 178 trans temp at 140 oil temperature at 223 oil pressure at 46 voltage 14.2
Before the incident on a 75 day going only 10 miles an hour in stop and go traffic water temperature was at 185 trans temperature at 159 oil temperature at 197 oil pressure at 46 voltage at 13.6 after the incident sitting and drive stopped on I 65 day water temperature was 200 trans temperature 166 oil temperature 214 Oil pressure 18 voltage 14.2
As for when the incident happened I don't quite recall how hot it was I know I llooked at the gauges was went into panic mode and I took my foot off the Excelerator the engine just stalled out and I cost to do a stop
As for dropping the pan and putting a new pump, I know that's a lot of work but I'm wondering about the oil relief spring / valve that people talked about on this post
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Old 10-17-2016, 03:30 AM   #68
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Personally as a guy with an associates degree in auto/diesel industrial your after numbers are far better than your before numbers. Quit worrying and enjoy it!
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Old 10-17-2016, 06:43 AM   #69
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I would question the before temp of 149, its too low for proper combustion. Big block Chevys will run 180 - 200.
As others have said low oil pressure is usually a main bearing problem. Do you have a knocking sound on cold start up?
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