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Old 08-31-2013, 08:58 AM   #15
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As suggested above, it sounds like a benign oil leak. 2x on the clean it up an find out where the oil is coming from.
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Old 08-31-2013, 10:40 AM   #16
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Anything mechanical that would lead to a quart in 250 miles would lead to a loss of power, overheating, smoking, noise, ect...

A warped head doesn't seem likely based on your description of the symptoms.

Check the valve cover bolts. The older gaskets compress and get hard. The bolts will often loosen up.

A simple compression check will tell a lot about the health of the engine.

You should be able to find someone reputable that wont look at you like a Christmas present waiting to be opened.

If you can give us any more information we can help further.

Good luck!

Dave...
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Old 09-01-2013, 07:00 AM   #17
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More info for 454 trouble

Thank all for your help and interest in solving this issue. I must admit, I am a bit over whelmed by your response.
Before the trip we had the rad. Rebuilt we did have trouble removing the oil cooling lines, the ends had to be replaced. Those are not leaking. On the last day of our trip the oil pressure gauge spiked to the limit of the gauge (over 60 psi) normally around 30. The coach continued to run fine, but I did notice a lot of foam on the dip stick.
One of your members has volunteered to travel to my location to help me find the problem, I will take him on the offer.
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Old 09-01-2013, 08:40 AM   #18
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It sounds like you have some sort of restriction in the oil cooling system that caused the pressure to rise and blow out a seal. The high oil pressure and the recent messing with oil cooling lines makes me suspicious that something got FUBARED during that process. Put a real gage on the oil system and go from there.

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Old 09-01-2013, 07:19 PM   #19
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Foam could be caused by over servicing the oil. The crankshaft can churn it up and cause foam. There are other more sinister causes.
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Old 09-01-2013, 08:08 PM   #20
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Good luck sorting this one out, take the start simple comments to heart. The PSI spike is a good symptom to focus on. If you find a sorta simple fix and save the engine, consider doing an engine oil analysis. Buy sample kit, collect sample at oil change,mail in, get results, read and smile or weep.
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Old 09-01-2013, 08:13 PM   #21
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You could also have a bad oil pressure regulator that is stuck closed but that rarely happens. It is a ball with a spring on it and when the pressure gets too high it lets oil go back to the crankcase. It is part of the pump. If you have a restricted oil cooler you would also get high oil pressure depending on which side of the oil cooler the sending unit is on. It is best to have it on the down stream side of the cooler so it measures pressure going into the block.

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Old 10-17-2013, 10:21 PM   #22
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Old 10-19-2013, 08:31 PM   #23
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I can't speak for what John has done since, but I was the person that visited him from the forum.

My assessment was that the rear main seal was leaking. There were no leaks along the sides of the block with the exception of near the filler neck extension. However, it was clear that this was not a significant enough of a leak to justify the loss that John was experiencing. There was no valve cover leakage. The dipstick tube was not broken or otherwise disconnected from the oil pan.

While I was under the engine and transmission area, it became clear from the appearance of the oil pan and transmission and the floor under it that the leak was near the rear of the engine. We topped-off the oil and started it up. Within about 5 minutes of running at idle speed, there was a quarter (coin) sized spot of oil on the floor under the converter bellhousing. It was engine oil, not transmission fluid. Knowing GM rear main seal history, I advised that most likely the seal was bad. It could also be the oil pan gasket at the rear only, but that seemed unlikely since the rest of the oil pan perimeter a clean and dry.

A cheap part but an expensive repair job.
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Old 10-21-2013, 08:17 PM   #24
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454 Trouble

This problem sounded so familiar to me as I had a similar experience with my 1999 GMC K2500 Suburban with 7400 VORTEC in 2007. While the engine had no history of oil consumption to that point (163,000 miles), oil consumption suddenly zoomed to a quart every 400 miles. The leak became obvious after a short highway trip of 200 miles without the Airstream . . . the rear of the Suburban was covered with oil. The initial diagnosis was that the oil pan gasket below the crankshaft had failed so that part (oil pan gasket) was replaced. All seemed fine for about 800 miles then the rear of the Suburban was again covered with oil following a 200 mile trip without the Airstream . . . back to the mechanic with the diagnosis that the rear main bearing seal was bad and needed to be replaced. A little over $1,300 later and the problem was fixed . . . the motor now has 198,000 miles and oil consumption is still just one quart between oil changes.

Given the cost of motor replacement, I was thrilled when this repair cost no more than it did . . . and I have added more than 35,000 miles since the repair with no evidence of further problems.

Kevin
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Old 10-22-2013, 07:35 AM   #25
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Thank you for your input, that was the conclusion that Jason came to. To update the coach is at the mechanic now hopeful that this leak can be fixed. He did say something about $1000.00 I to wold be happy with that.
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Old 10-22-2013, 06:49 PM   #26
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That is really not a hard job. You can rent a transmission jack and do it yourself. That would be $100 maybe.

Perry
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Old 10-22-2013, 07:09 PM   #27
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Perry,

A transmission jack wouldn't help this old retired fart on jack stands.

I left my Rotary Lift at the Chevy Store.

Young wipper-snapper.

Bob
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Old 02-15-2014, 08:44 AM   #28
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Originally Posted by johndes View Post
Just back from CA trip 5285 mi with motor problems. Began losing oil at the rate of 4 qt per 1000. I say losing because the motor did not seem to be burning oil. The bottom and lower sides became coated with oil, mostly on the passenger side.
I am having difficulty finding someone to work on the motor or possibly replacing the 454.
I really don't know the extent of the problem, could be a head gasket failure or warped head, so I am told.
Visited Chevy dealer in Akron, OH told I would be looking at between 9 and 10 K for a replacement. I don't know if that is a good quote or not. I just got the feeling that if they looked at my coach the engine was going to need replaced. The coach has 70000 on it. I need someone to check this out. I live in NE Ohio and can travel to a shop almost any ware in the East. Any help, suggestions, or recommendations would be great.
I would like to update all who submitted possible solutions to the above post. First of all someone suggested checking the dip stick tube where it enters the engine block. That was the problem. However that was not the complete problem. This started about two years before when the alternator had to be replaced during that process a small clamp that holds the oil fill tube and the dip stick tube in place was lost. I was informed that I needed to rig something to replace the lost clamp. I did not do it. Big mistake. We continued our trip to Florida that year. Every time I checked the oil I was (unknowingly) puling the dipstick tube out of the engine block and I was not getting a true reading on the oil level. It appeared the coach was using more oil than it had been. Now fast forward one year, we are preparing for a trip to California, about 5000 mi. After replacing the radiator the missing clamp was found laying on top of the A-frame. It had been there for about 4000 miles. We replaced the clamp not realizing the tube was now out of the engine block completely. When changing the oil before we left for the trip, it seemed to take a lot of oil to get a reading on the dip stick. I am guessing about 10 quarts. I must admit at this time I did not know how much oil the 454 took. We leave for California. After the second day I had to add 4 quarts of oil (about 1000 mi). I did not realize that I was over filling the 454 and the engine was blowing the excess oil out of several places including the dip stick tube hole now wide open. We estimate we sprayed the highway with about 20 quarts of oil during the trip. I was over filling about 3 quarts, it is amazing to me the thing kept running and running well for the 5000 mi. Thank you all for your help, interest, and suggestions. There is a lesson to be learned here, maybe a couple.
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