Piston Slapping
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Junior User
Joined: Jul 2001
Posts: 99
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From: Our Home Is Where We Park
Piston Slapping
I own a 99 Superduty with the V-10 that I ordered from the factory and received at the end of March in 1999. I love the truck and have had no trouble with it, other than my wife and I both agree the front bucket seats are terrible.
I have heard many people mention the problem of piston slap in the earlier V-10's. What is it, and how do I know if I have a problem? I do not notice any particular sound. What should I be listening for. I now have 33,000 miles and want to make sure I do not miss any problems before the warranty expires.
For information of others:
My truck is an F-350XLT, srw, 2wd, short box, crew cab, auto, 4.30 limited slip rear end, heavy duty tow package, stabilizer bars, 265-75 R-16 tires.
Aftermarket products include Line-X spay on bed cover, Pace Edwards Cover, Gear-Vendors Over-Underdrive, Banks Trans Command, Amsoil By-Pass Filter Sysem.
I run Amsoil Synthetics in the engine, transmission, rear-end and wheel bearings and do oil analysis using the Amsoil Tri-Guard System.
The truck also has a deflector nose guard, full length fiberglass running boards, 4 lighted grab bars for entry assistance by doors (mostly for looks) I also use a roof mount stainless steel Wingmaster airfoil when pulling my 10,000 lb loaded weight 5th wheel.
Mileage to date;
Towing; Worst 7.6 at 70 mph into a 15 mph headwind.
Best 12.3 at 50-60 mph with a 10 mph tail wind.
Average at 60 mph. 10 to 10.5.
Solo, with two people and 500 lbs in truck bed at 70 mph, no
wind on a 250 mile trip. 17.3
At 60 mph, same conditions, 350 miles. 18.7 mpg.
Average around town and to work. 10-12 mpg.
Hope this is helpful to others with questions about mileage.
One Lucky Guy
I have heard many people mention the problem of piston slap in the earlier V-10's. What is it, and how do I know if I have a problem? I do not notice any particular sound. What should I be listening for. I now have 33,000 miles and want to make sure I do not miss any problems before the warranty expires.
For information of others:
My truck is an F-350XLT, srw, 2wd, short box, crew cab, auto, 4.30 limited slip rear end, heavy duty tow package, stabilizer bars, 265-75 R-16 tires.
Aftermarket products include Line-X spay on bed cover, Pace Edwards Cover, Gear-Vendors Over-Underdrive, Banks Trans Command, Amsoil By-Pass Filter Sysem.
I run Amsoil Synthetics in the engine, transmission, rear-end and wheel bearings and do oil analysis using the Amsoil Tri-Guard System.
The truck also has a deflector nose guard, full length fiberglass running boards, 4 lighted grab bars for entry assistance by doors (mostly for looks) I also use a roof mount stainless steel Wingmaster airfoil when pulling my 10,000 lb loaded weight 5th wheel.
Mileage to date;
Towing; Worst 7.6 at 70 mph into a 15 mph headwind.
Best 12.3 at 50-60 mph with a 10 mph tail wind.
Average at 60 mph. 10 to 10.5.
Solo, with two people and 500 lbs in truck bed at 70 mph, no
wind on a 250 mile trip. 17.3
At 60 mph, same conditions, 350 miles. 18.7 mpg.
Average around town and to work. 10-12 mpg.
Hope this is helpful to others with questions about mileage.
One Lucky Guy
Logistics Pro
Joined: Feb 2000
Posts: 3,955
Likes: 49
From: Mesa
Piston Slapping
My piston slap started at about 16k miles. It is a "clatter" at first start up. Also a clattering while accelerating through the gears from a stop. It would usually last a minute or two. Once the engine reaches opperating temp it stops. Some say it's worse during cold temps but mine did it reguardless of temp. Only when the engine is cold(like sat over night) Ford replaced mine with a FQR (remanufactured) engine. I have 22K on that one and have only heard the clatter a few times. Only while driving. It's still quiet on start ups. (knock on wood) A good filter and oil will help.
