1990 460 Lifter problem
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From: Prince George, B.C.
1990 460 Lifter problem
Hey all, I just did an oil change on a '90 460 in an F-250. The truck's only purpose since we have owned it has been to haul a 10' 6" 1968 Vanguard camper, it does that quite well too. The Problem is that since the oil change it has had 1 and sometimes 2 lifters rattling really loud, it sounds like the front right cylinder. I used 20W50 Castrol GTX in it and am not sure if that is the problem or if it is somthing worse. I checked the oil psi and it was 75PSI cold while the lifter was ticking so the oil psi isn't the problem here. While I'm in there for the lifter swap, what am i looking for with the cam to make sure it is alright?
Other than the computer cam comp offers, this one here:
the XE256H-14 114 deg lobe sep. Comp part #: 34-255-5
What else will work? I have a couple others that look like they might, they are the dual pattern ones.
34-223-4 255DEH 110 deg
34-226-4 265DEH 110 deg
Any comments? Thanks in advance.
Other than the computer cam comp offers, this one here:
the XE256H-14 114 deg lobe sep. Comp part #: 34-255-5
What else will work? I have a couple others that look like they might, they are the dual pattern ones.
34-223-4 255DEH 110 deg
34-226-4 265DEH 110 deg
Any comments? Thanks in advance.
Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
if your pulling the cam to look at it, then it will be obvious if it's bad the lobes will be wiped almost flat. I would pull the valve cover first though and make sure you don't have a loose, or bend rocker arm which could be a real easy fix. Also I have seen people mistake a exhaust leak for a ticking lifter, and the 460s were nitorious for cracking exhaust manifolds, and since you think both lifters are in the same area you might just have a cracked manifold so check it out before you start tearing into the engine(look for signs of soot around the exhaust both on the manifold itself, and at the head mounting surface.)
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From: Prince George, B.C.
I thought exhaust leak at first as well but I really can see anything. This is one of those sounds that will go away when you leave in the morning, then the truck will stay quiet till you drive it for about 30 sec over 3000 RPM like when passing. Then the tick is loud as heck, kinda more along the lines of a soild lifter that is way too loose, let the engine sit for an hour and it will tick for a bit then go away again. Problem is the last time I used the truck I pulled out to pass and even though the one lifter started and was fairly loud I held my foot into it, then it sounded like another one started. I'll have a look at rockers and such too see but the truck will run totally quiet on its own still if I go drive down my road to the highway and back. As far as the cam I was just planning on having a look without pulling it. If we can't see and real visible signs on the cam while it is in the block we won't be too worried, but a wiped lobe should show up on the bottom of the lifter as well shouldn't it?
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From: Prince George, B.C.
I just thought I would add this since I got the intake off. I noticed that the the cam lobes only touch half the face of the lifters. The cam seems to sit a ways back from where it should.
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From: Prince George, B.C.
Update 2, I got the valve covers off and had a look, the rockers are all in great shape. I still can't figure why the lifters aren't centered on the cam lobes.
Last edited by 351M; Aug 1, 2005 at 10:13 PM.
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From: Anza Borrego Desert, Ca.
The lifters need to turn in their bores for even wear, so they will be a little off-center. Can you use a pry bar of some kind in a place on the cam to find out what back and forth movement there is? Dont scar any machined surface!!! At the same time look at the cam bearing bores to see if the prying motion moves the cam bearing surface out of the bore. I'll bet the cam doesn't move much. If it does, not a real big deal considering what you have already done. Now the News- I am also going with the exhaust leak, primarily because it comes and goes. The usual diagnosis is that you will hear it UNDER LOAD, like hard acceleration, up a hill, etc. Won't hear it when just cruising or idleing. Some times, when cold the gap closes and no noise, warms up or gets hot gap opens, noise! But mostly need to be under load to hear it. Not a whole bunch of fun to fix because of access, but some fairly permanent fixes are, if manifold not cracked; new gasket, new copper gaskets(my choice), have manifold surfaced and remount with no gasket, or get some headers. Good luck. Alex
Mountain Pass
Joined: Jan 2005
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Hope for the exhaust leak! If you lost a lobe off the cam. all that metal will be pushed through the oil system taking out the bearings scoreing the crank and you are looking at a complete rebuild. It just happened to me on a 4 year old motor with only 14,000 miles on it.
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From: Prince George, B.C.
Well, I just checked and the lobes were good, all back together with new lifters and I'm just waiting on the Valve cover gaskets. I know its not an exhaust leak though, its way too loud and the stethascope told me it was comming from the right bank near the front, plus it ran rough when it was really ticking. I forgot to check for play in the cam while the lifters were out though. So I'm hoping to know tomorrow afternoon if its somthing worse wrong then I though. Any ideas on timing this thing? It has the factory mark on the damper plus 2 paint pen marks. I have never been able to get the timing right on this engine. Close but not right. Looks like the damper has been moving a bit.
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