460 issues
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New User
Joined: Jan 2004
Posts: 24
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From: Massachusetts
460 issues
I have a 95 F350 Dually flat bed with a 460 efi. It has about 101,000 miles on it. I recently attempted a simple tune up and while trying to get plugs out snapped 2 on them off in the head. I drilled them out, tapped, and installed inserts in these two cylinders. I stuck a tube down and vacummed out the cylinders and turned the motor over a few times with the plugs out to get rid of any metal in the cylinder. Now the truck is back together and I am seeing moisture/oil coming from the breather line off the oil filler cap. The truck also seems like it is missing on a cylinder, wires are not crossed I've checked that multiple times. I thought it must have damaged something in 1 of those cylinders I was working on. I did a compression check today and found all cylinders to be around 90 PSI. I was able to get them up to about 150 psi added a bit of clean oil into the cylinder prior to doing the check again. Does it sound like a case of worn piston rings in all the cylinders ? Thats my thought but i'm in denial. it only has 101,000 on it. Any idea's....
Postmaster
Joined: Nov 2001
Posts: 3,351
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From: Escondido, CA
Yeah the rings are worn uniformly or you have out of round cylinders with a lot of wear. Chances are that the rings are bad. My 460 had 73,000 and the cylinders just needed honing. The increased blow by of the rings will result in the breather line. You may have not noticed it before since you just did the tune up and are looking for things now. As for the misfire, does it only do it while you have a constant rpm on the engine or all the time?
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New User
Joined: Jan 2004
Posts: 24
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From: Massachusetts
The misfire is only noticable at an idle. When you drive down the street you cannot feel the misfire. The truck does lack some power though. I bought it last January and use it primarily as a plow/sander truck. It has been a plowing and sanding truck since new. I have no doubt it has been worked hard for the 101,000 miles. Do you think I can get by another few months running this way or will the motor finally go south due to the blowby.
Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
You can still run it but the effiency isn't as good as new. If I am not mistaken stock engines ran 140-150 psi on each cylinder. You should be able to run it for a while actually. Just keep in mind the longer you run an engine the worse it wears out. IMO I would buy another 460 and build it up while your still using the one you have. Then when you are done building it swap it out for new then sell the old one as a rebuild / core. Just my opinion though.
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New User
Joined: Jan 2004
Posts: 24
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From: Massachusetts
The truck has a manual transmission. I'm gonna look around for a 460 motor. I was hoping the smaller motor would give me a little better mileage. It's not worth spending the coin making mod's to other parts to make the 351 fit. The truck spends most of it's time driving 20 mph pushing snow. Thanks for all the help.
This site is great. I have 3 fords and it takes the guessing out of what it could be when something goes wrong.
2002 F350 4 x 4 Dually Dump V10
1995 F350 4 x4 Dually flat bed 7.5
2000 Expedition 5.4
This site is great. I have 3 fords and it takes the guessing out of what it could be when something goes wrong.
2002 F350 4 x 4 Dually Dump V10
1995 F350 4 x4 Dually flat bed 7.5
2000 Expedition 5.4
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Postmaster
Joined: Nov 2003
Posts: 4,392
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From: Cab of a truck
The 351/400 m never came in a 95, i believe that the 351-400s' stopped in around 81-83. A small block 351w does not have the same bellhousing.
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