Knocking at high RPMS
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Senior User
Joined: Nov 2007
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From: Coats, North Carolina
Knocking at high RPMS
It's done it since i bought the truck, but when I get on it, but let off the gas a little you'll hear it continous knocking. Dad thinks it's the front main crankshaft bearing going bad. It doesn't do it as much when I started using the Ford Motorcraft 10w30 motor oil vs. what I put in there because I didn't know what the guy was using, castrol high mileage 10w30.
Elder User
Joined: Sep 2007
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From: Kalamazoo, MI
it could be a worn thrust bearing letting the crank walk...
my first guess would be piston slap.
either way, you're looking at a rebuild.
screw a manual pressure gauge in the tap and take a reading.
my first guess would be piston slap.
either way, you're looking at a rebuild.
screw a manual pressure gauge in the tap and take a reading.
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Senior User
Joined: Nov 2007
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From: Coats, North Carolina
Well it's still running stong, never have a problem, never smokes or anything. Just a noise. I'm hoping this motor will take me a while so I can save up some money, maybe slap a new motor in there.
Think it'll be fine before i have to put a new motor in?
Think it'll be fine before i have to put a new motor in?
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Senior User
Joined: Nov 2007
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From: Coats, North Carolina
Well I just priced a rotating assemblies over-bore kit on jegs.
I can't shop on there, lol I want too many things!!!
Anyays, to cam it, 392 stroker rotating assemblies kit, and a set of gt-40x aluminum cylinder heads
Total: $2,928.
I figured while I'm in there, do what I want to do to it. I just want to cam it, don't really want to do the bore, but why not. and the heads would be NICE.
I can't shop on there, lol I want too many things!!!
Anyays, to cam it, 392 stroker rotating assemblies kit, and a set of gt-40x aluminum cylinder heads
Total: $2,928.
I figured while I'm in there, do what I want to do to it. I just want to cam it, don't really want to do the bore, but why not. and the heads would be NICE.
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Senior User
Joined: Nov 2007
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From: Coats, North Carolina
True, but the fuel injection makes it so much harder to do, taking off the upper intake manifold can be a pain if you're a backyard mechanic with limited resources.
Well guess I'd better start saving, while I'm in there, I might as well fix all my rigged up vacuum lines since I'll have to remove those anyhow.
Well guess I'd better start saving, while I'm in there, I might as well fix all my rigged up vacuum lines since I'll have to remove those anyhow.
