76 f250 428BBF Need Help
Thread Starter
|
New User
Joined: Jan 2009
Posts: 11
Likes: 0
76 f250 428BBF Need Help
I have a 428 cobra jet motor in my truck and it has recently lost almost all power. No water in oil, swapped plugs, wires, distributor, coil, fuel pressure is good, changed intake gasket no luck. No leaks, compression check was good. runs at 20 advanced until now. i have to go 40 advance to move it out of garage. no chain its gear driven. motor has 8000miles on it. cn i get some help?
thanks
thanks
Posting Guru
Joined: Jan 2005
Posts: 1,299
Likes: 2
From: The Vieux Ford, Kansas
You can check the chain with out pulling the engine. Just take the dist cab off and turn the motor back wards untill the rotor moves, the turn it over the other way and if if it goes along way before the rotor moves you chain is sloppy.
-Johnboy
-Johnboy
Mountain Pass
Joined: Nov 2007
Posts: 226
Likes: 0
From: Chehalis, WA
I believe if you read the OP, he has a gear drive no timing chain.
I would take a look at the distributor drive gear it may be worn or the pin may have sheared.
I would take a look at the distributor drive gear it may be worn or the pin may have sheared.
Mountain Pass
Joined: Nov 2007
Posts: 226
Likes: 0
From: Chehalis, WA
Trending Topics
Posting Guru
Joined: Jan 2005
Posts: 1,299
Likes: 2
From: The Vieux Ford, Kansas
Sorry I missed the gear drive thing too. You could have broken the roll pin on the distributor gear, and that changed your timing.
-Johnboy
-Johnboy
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
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
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
It would be nice if it was just the dist. driven gear but I kinda doubt that's the problem. In the op hauntedz28 said he had to advance the timing to 40 deg. so that kinda lets the worn gear off the hook and if the drive pin had sheared it would be so far out of time at best it would backfire rather than run.
I'm betting on a worn cam. Oils nowdays are formulated for roller tappet engines and, as written about in this forum recently, don't have the zinc additives like they used to. This can cause accelerated wear/ failure of the camshaft.
Sad but true.
I hope I'm wrong and it's something simple (cheap) to fix.
I'm betting on a worn cam. Oils nowdays are formulated for roller tappet engines and, as written about in this forum recently, don't have the zinc additives like they used to. This can cause accelerated wear/ failure of the camshaft.
Sad but true.
I hope I'm wrong and it's something simple (cheap) to fix.
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 60
I bet the camshaft PIN broke that clocks the cam to the timing gear.
The pin shears off and as the cam and timing gear rotate throwing the cam and timing off in the process. That's part of the reason for timing chains and timing belts, they transfer a lot less harmonics to the valvetrain compared to timing gears. Keep the gears to short runs and use a timing set for everyday use.
Josh
The pin shears off and as the cam and timing gear rotate throwing the cam and timing off in the process. That's part of the reason for timing chains and timing belts, they transfer a lot less harmonics to the valvetrain compared to timing gears. Keep the gears to short runs and use a timing set for everyday use.
Josh