460 using oil
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
460 using oil
I have a 1989 f-350 with a 460 5 speed 90,000 miles. It is using a qt of oil about every 200 miles. There is no visible leaks I have not seen it smoke. It leaves no spots on the shop floor.
Changed sprak plugs and number 8 was loaded with white stuff figure it si fly ash from burning oil. put nre plugs in and have driven it for a couple of months still using oil. did a compression check this week and all cylinders have 140-145 lbs compression. but Number 8 sparkplug was darker and in comparison to the other plugs looked terrible. the other plugs still looked new. The truck doens't miss but it also doesn't idle as smooth as I think it should. Yet idle vacume is solid and above 18 inches. Any Ideas would be appreciated.
Changed sprak plugs and number 8 was loaded with white stuff figure it si fly ash from burning oil. put nre plugs in and have driven it for a couple of months still using oil. did a compression check this week and all cylinders have 140-145 lbs compression. but Number 8 sparkplug was darker and in comparison to the other plugs looked terrible. the other plugs still looked new. The truck doens't miss but it also doesn't idle as smooth as I think it should. Yet idle vacume is solid and above 18 inches. Any Ideas would be appreciated.
Mountain Pass
Joined: Jan 2001
Posts: 229
Likes: 0
460 using oil
Good compression means good sealing, so its not rings, valves. Could be valve guides... Dont know why that would happen on only #8, but it could..
stock intake? May be an oil leak into #8 runner, not sealing up against the head..
Just a couple of ideas... Good luck!
J/.c
1965 Ford Galaxie 500 (okay, so not quite a truck)
460/C6 transplant @ 389hp/491 lb.ft.
14.29@103.8, 13-14 mpg heheheheheh
stock intake? May be an oil leak into #8 runner, not sealing up against the head..
Just a couple of ideas... Good luck!
J/.c
1965 Ford Galaxie 500 (okay, so not quite a truck)
460/C6 transplant @ 389hp/491 lb.ft.
14.29@103.8, 13-14 mpg heheheheheh
Tuned
Joined: Apr 2001
Posts: 443
Likes: 1
From: Athens, AL
460 using oil
the 429 in my 78 bronco uses a quart every 100 miles, and i don't see smoke either...but it is there....not very visible because, i am told, it is such a large engine...still haven't traced my consumption...haven't done a compression check, but yes, yours sounds like valve guides....
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Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
460 using oil
This engine is pure stock intake and all. I have heard a rumor that Ford had some intake problems on this engine of about this manufacture date. Any one know anything specific? I just finshed changing the Intake valve stem seal on the number 8 cylinder this morning. I did not find the valve to be loose in the valve guide and the original stem seal was intact. I did this without removing the head. Guess we will drive it for awhile and see if this helped or not. I do not have a lot faith in this fixing the problem. Any other ideas let me know.
Posting Guru
Joined: Sep 1999
Posts: 2,297
Likes: 1
From: Indiana
460 using oil
I have a 400 with the exact symptoms you have. I have discussed it on here quite a while back as I was trying to figure it out. In my case I think it is a broken oil ring on the piston. I had all new guides put in the heads and stem seals also, it did not help anything even though the guides were worn badly. I had no smoke, leaks, good vacuum, and good compression, it uses 2-3 quarts a week now and still runs fairly well, it is starting to take a dump though finally. I just milked it for all it had. I'm going back with the 460.
Superdave
94 Ford Aerostar XL 3.0L
82 Ford F250 4x4 XLT,400 CID,C-6 A/T,8700lb GVWR. Black & Silver
Superdave
94 Ford Aerostar XL 3.0L
82 Ford F250 4x4 XLT,400 CID,C-6 A/T,8700lb GVWR. Black & Silver
