engine knock?
Thread Starter
|
Senior User
Joined: Apr 2008
Posts: 266
Likes: 0
From: Michigan
Senior User
Joined: Sep 2007
Posts: 499
Likes: 0
Do you have a loss in oil pressure once warmed up or a loss in power?
Now that I've heard the vid, I'd have to say that I think it sounds like a knock. What all have you used the truck for? Did you change the oil regularly? Did you run the **** out of it? What kind of oil have you been using (weight and brand)?
Now that I've heard the vid, I'd have to say that I think it sounds like a knock. What all have you used the truck for? Did you change the oil regularly? Did you run the **** out of it? What kind of oil have you been using (weight and brand)?
Thread Starter
|
Senior User
Joined: Apr 2008
Posts: 266
Likes: 0
From: Michigan
I dont think i have a loss in oil pressure, i might have a lilttle loss in power, but she still runs very strong, so i dont know. i have just used the truck for regular drving, i have changed the oil regulary, i havent really got on it a whole lot, every once and a while ill floor it. Umm, i have been using Penzoil, 30 weight.
Elder User
Joined: Jul 2007
Posts: 651
Likes: 0
a new engine.
but to me, in the vid it doesnt really sounds like engine knock, but try listening underneath to isolate.
but to me, in the vid it doesnt really sounds like engine knock, but try listening underneath to isolate.
Trending Topics
Postmaster
Joined: May 2008
Posts: 2,703
Likes: 3
From: La Vergne, TN
uhm its kinda hard to tell it does sound like an engine knock to me but not real sure hard to tell id have to hear it in person to tell
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Posting Guru
Joined: Nov 2004
Posts: 1,137
Likes: 2
From: Asheville, NC
Used to have a 300 six that spun a rod bearing. (then, I bought it!) Driving it home, I was able to silence the knock by backing off the throttle as much as possible and maintain speed. It ran quiet most of the trip, 40 miles, and with a reconditioned crank, bearings, and one rod and piston, it ran another 200k for me over 14 years.
Of course, I had a garage to work in at the time.
You might need to know how low your oil pressure is at this time.
Of course, I had a garage to work in at the time.
You might need to know how low your oil pressure is at this time.
New User
Joined: Jul 2008
Posts: 16
Likes: 0
I can't tell from the video. But here are some suggestions.
1. Take off the belts, you can run it a minute or two if you start off with a cold engine. That will get rid of the acceory noises.
2. Rod bearings will sometimes give you a double knock when you rev it up and let off.
3. Main bearings will give a deep rumble.
4. At 153,000 miles I'd suspect a cam chain that has stretched and is fluttering.
5. If it gets worst when the engine oil is up to temp "please don't try this with the belts off" then its a bearing.
6. If its worst cold then piston slap.
7. Things that go knock: Rod, main, wrist pins, lifters, cam chains, Pistons, loose flywheels, Loose bolts that hold things on and dont forget the exhaust bumping on something.
1. Take off the belts, you can run it a minute or two if you start off with a cold engine. That will get rid of the acceory noises.
2. Rod bearings will sometimes give you a double knock when you rev it up and let off.
3. Main bearings will give a deep rumble.
4. At 153,000 miles I'd suspect a cam chain that has stretched and is fluttering.
5. If it gets worst when the engine oil is up to temp "please don't try this with the belts off" then its a bearing.
6. If its worst cold then piston slap.
7. Things that go knock: Rod, main, wrist pins, lifters, cam chains, Pistons, loose flywheels, Loose bolts that hold things on and dont forget the exhaust bumping on something.
Thread Starter
|
Senior User
Joined: Apr 2008
Posts: 266
Likes: 0
From: Michigan
I can't tell from the video. But here are some suggestions.
1. Take off the belts, you can run it a minute or two if you start off with a cold engine. That will get rid of the acceory noises.
2. Rod bearings will sometimes give you a double knock when you rev it up and let off.
3. Main bearings will give a deep rumble.
4. At 153,000 miles I'd suspect a cam chain that has stretched and is fluttering.
5. If it gets worst when the engine oil is up to temp "please don't try this with the belts off" then its a bearing.
6. If its worst cold then piston slap.
7. Things that go knock: Rod, main, wrist pins, lifters, cam chains, Pistons, loose flywheels, Loose bolts that hold things on and dont forget the exhaust bumping on something.
1. Take off the belts, you can run it a minute or two if you start off with a cold engine. That will get rid of the acceory noises.
2. Rod bearings will sometimes give you a double knock when you rev it up and let off.
3. Main bearings will give a deep rumble.
4. At 153,000 miles I'd suspect a cam chain that has stretched and is fluttering.
5. If it gets worst when the engine oil is up to temp "please don't try this with the belts off" then its a bearing.
6. If its worst cold then piston slap.
7. Things that go knock: Rod, main, wrist pins, lifters, cam chains, Pistons, loose flywheels, Loose bolts that hold things on and dont forget the exhaust bumping on something.
Elder User
Joined: Jul 2007
Posts: 651
Likes: 0
you kinda cant b/c for most motors its normal,
its just when its cold the pistons are smaller and kinda bounce around the cylinder walls until the piston heats up and expands.
doesnt sound good but all the 4.6s and 5.4s do it and run 400k miles+
its just when its cold the pistons are smaller and kinda bounce around the cylinder walls until the piston heats up and expands.
doesnt sound good but all the 4.6s and 5.4s do it and run 400k miles+