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Tractor Talk Discussion Forum

Ford F150 buring oil

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Hurst

12-17-2005 09:21:01




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We have a 92 f150 with a 5.0 electronic fuel injected engine that has about 126,000 miles on it. In the past few years, the motor has gotten to where it burns about a quart a week in motor oil. I was wondering if it would be worth the time to squirt a good shot of ATF or diesel to loosen the rings up. It really only does it on 2 cylinders, since those plugs were really bad looking when we changed them last. Could just 2 rings wear out or does this sound like the rings are stuck to the piston and need to be loosened up with something. Thanks

Hurst

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jhill

12-17-2005 17:39:35




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 09:21:01  
I would have to say valve seals. They go bad as much from age as from wear.



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Bus Driver

12-17-2005 10:02:36




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 09:21:01  
Two inexpensive things to try are to install new PCV valve and to add SeaFoam to the crankcase. My oldest car started leaking oil and the oil seal leakstop made it worse. Discovered that my PCV valve was clogged. Caused pressure to build inside the engine. A new PCV valve for less than $3.00 stopped the leak entirely. SeaFoam is an expensive product. I have little experience with it, but have heard lots of enthusiastic support and no derogatory comments. The oil rings for those cylinders might be stuck and the SeaFoam is supposed to help that.

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Hurst

12-17-2005 10:12:28




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 Re: Ford F150 buring oil in reply to Bus Driver, 12-17-2005 10:02:36  
I have used sea foam in fuel on a 6610 diesel tractor and it really helped it some (even though it had a burnt piston that we found when the engine was torn apart a little after putting the sea foam in). The only stuff we have added was some STP and also some engine rejuvinator crap that didn't do squat. Could you explain where the PCV valve is and how to replace it? I am running to town to look at a christmas tree with my dad this afternoon and was going to stop by wallie world to get 5-30 motorcraft oil and a filter for my mom's car, and there is an advance auto right near there. Also, I should mention, the engine runs rough at idle and will die pretty easily if it has a load, even after screwing in the idle set screw. I will probably try to get some seafoam for the truck this afternoon and try that first? Can you put sea foam in the cylinders like ATF to loosen up the rings? Thanks

Hurst

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TomTX

12-17-2005 10:01:42




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 09:21:01  
Hurst,
How many miles per quart of oil?
What brand/weight oil and filter do you use?
How many miles per oil and filter change?
Tom



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Hurst

12-17-2005 10:07:24




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 Re: Ford F150 buring oil in reply to TomTX, 12-17-2005 10:01:42  
I am not sure on the miles per quart, but the truck is a farm maintenance truck, so on average, it makes about 3 runs out of town (20 miles at most per run) and the rest is just short farm driving. I would guess 200-250 miles per week. We use Carquest 10w30 oil and carquest oil filter. We generally change the oil about 3 times a year, so I would guess about 3-4 thousand. The truck has not had any work done on the PCV valve, exhaust, etc, just routine oil changes, air filter changes and also we have had the tranny rebuilt once. Thanks

Hurst

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Jon Hagen

12-17-2005 10:26:17




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 10:07:24  
There is a chance of stuck or broken rings on two cylinders,but an even better chance that you have hard and broken valve seals on those two cylinders causing oil consumption and plug fouling. If the compression is even on all cylinders,I would try new valve seals. This is not a bad job,as you can replace them without taking off the heads. Most auto parts stores will have the spring compressors and spark plug air hose adapter to use air pressure to hold the valves in place while you replace the seals.

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Hurst

12-17-2005 10:38:13




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 Re: Ford F150 buring oil in reply to Jon Hagen, 12-17-2005 10:26:17  
Jon, I was reading your post, and if I were to buy a compression tester, what would I expect if the rings were broken? I saw where you said if they were all close, then the valves are probably the problem, but wouldn't that cause a drop in compression and oil rings would be constant? I just wanted to make sure that wasn't a typo. How do you change the valve seals without removing the head? Are you talking about the valve guides? Thanks.

Hurst

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Jon Hagen

12-17-2005 15:53:50




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 Re: Ford F150 buring oil in reply to Hurst , 12-17-2005 10:38:13  
Compression on all cylinders will be within 10% of each other if rings and valves are OK. If the bonnet type valve seals are bad it will allow a lot of oil to be sucked down the valve guides and into the cylinders. To change the valve seals without removing the heads,you make or buy an adapter fitting that allows you to attach your air compressor to the spark plug port. 100 psi of air pressure in the cylinder will keep the valves tightly seated,which will allow you to carefully compress the valve spring and remove it and the valve retainer,so you can replace the valve seal. You can get several types of lever type or captive spring compressors that allow you to compress the valve spring without anything contacting the valve head. You need to use care that you dont accidently push a valve open and lose the air pressure in the cylinder,if you do you face the real danger of dropping a valve into the cylinder. If that happens,you WILL have to remove a head :(. I have used this method many times with good results,allows you to replace valve seals with only removal of the valve covers and rocker arms.

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Jon Hagen

12-17-2005 16:04:07




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 Re: Ford F150 buring oil in reply to Jon Hagen, 12-17-2005 15:53:50  
If you do a compression test,either remove all sparkplugs before attempting any test,or hold the throttle full open while cranking the engine.
A closed throttle with all the sparkplugs installed will starve the cylinders for air and cause a false low compression reading. Make sure the ignition is disabled before attempting a compression test.



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Lumpy

12-17-2005 12:34:57




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 Re: Ford F150 buring oil in reply to Hurst , 12-17-2005 10:38:13  
If the compression is more than 10psi lower, on those 2 cylinders, you most likley have bad rings. On a engine that old 90-100 psi of compression is respectable. Did it just start using that much oil?



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Hurst

12-17-2005 15:48:50




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 Re: Ford F150 buring oil in reply to Lumpy, 12-17-2005 12:34:57  
It has been using a little oil for a while, but just this year it got to where we were constantly adding it about once a week. I can understand a quart or two in between a change, but every week?? Is the 5.0 not a very long lifed engine compared to some of the other fords like the 4.9 I6 and the newer engines? We bought it with about 60 or 70k highway miles. I bought a can of seafoam tonight. The directions say and ounce per quart of oil, so I will add half of it to the crank case and then the rest to one of the tanks. Also, the guy who drives this truck is taking vacation next week, should I pull the plugs out and squirt a good amount of ATF in each cylinder so it can sit for about 5 days like that? Also, how much ATF would you put in each cylinder? If we are able to aford it, we are hoping to trade in the truck this summer for a newer used ford f150 4x4 (4x2 is not too good on the farm for a maintenance truck). Thanks for all the help so far. Oh, also, I wasn't able to get a compression checker, they were a little pricy for one use. I will try this, I am not concerned competely with knowing exactly how worn out the engine is, I just want to cut down on the oil consumption.

Hurst

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RN

12-17-2005 18:10:53




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 15:48:50  
Ford 302 oil problems? 5L/302 reputation is generally good- 1 problem maybe for you- rear main seal was a Oring type same as 140 4cyl, old VW beetle. This was known to wear and leak/weep oil over time. If your burning oil you should see white smoke at tailpipe unless cat is burning it. Do you see a small puddle of oil where the truck is parked? check under engine, oil drip will be small at park as oil would weep when running mostly. Valve guide wear and valve seal also known, not really bad rep- just that short guides and high temperature operation for pollution control reasons caus more wear than original design use of engine in late 60s. Small block Chevy has some minor problems also known- Ford thinwall cast V block has theirs quirks. Over 100,000 miles some things need attention on most engines. RN.

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Hurst

12-17-2005 18:24:45




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 Re: Ford F150 buring oil in reply to RN, 12-17-2005 18:10:53  
I don't see any oil under the truck in a puddle, but I have gotten under the truck several times and it does show some signs of a little leaking, but nothing more than moist spots. I would think a quart a week would leak a lot more than this. It does have a white fume to the exhaust, almost more a a blueish white, the kind of white smoke you see from a diesel motor when you are cranking it on a cold morning, except not as dense (thank goodness lol). Thanks for the help.

Hurst

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Lumpy

12-17-2005 16:10:34




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 Re: Ford F150 buring oil in reply to Hurst, 12-17-2005 15:48:50  
I would almost bet, valve seals. They are realitively easy to replace. Someone else said something about taking out the spark plugs and using a special fitting to hook to air hose. I have done this and it is the only way to do it. As far as reliablility-- one of the best ford made. Had one in a '79 2wd. The only major repair was done at 147,000... timing chain and sprockets. At 182,000 complete overhaul. Let me put it to you this way, Ford stopped making the 302 in 1997, thats when I went to chevy. Bought a new 1/2 ton 4x4 with good ole 350, truck has 125,500 on the ticker and plan on keeping it for awhile yet.

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Aaron Ford

12-17-2005 20:24:36




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 Re: Ford F150 buring oil in reply to Lumpy, 12-17-2005 16:10:34  
I run the piston on the cylinder being worked on to TDC, this reduces the chances of dropping the valve too far.



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