Interference/ Timing chain question
Thread Starter
|
Freshman User
Joined: Mar 2004
Posts: 44
Likes: 0
From: esc
Interference/ Timing chain question
I have a 1988 F-250 4x4 with 460 motor. It has original motor with 103000 miles on it first question is if the chain breaks will the pistons hit the valves?
How long is the service life of a timing chain on a 460 with a five speed stick?
Is there a way to check sloop on a timing chain?
This truck I believe has sealed front wheel bearings how long do they last? Should one do preventive maintenance and replace them at certain mileage?
Any help would be great
Brett
How long is the service life of a timing chain on a 460 with a five speed stick?
Is there a way to check sloop on a timing chain?
This truck I believe has sealed front wheel bearings how long do they last? Should one do preventive maintenance and replace them at certain mileage?
Any help would be great
Brett
Last edited by stewart; Jul 25, 2009 at 12:58 AM. Reason: forgot another question
Senior User
Joined: Jul 2005
Posts: 347
Likes: 0
From: USCGC Never Home
You should have standard roller cone wheel bearings. I dont think I have ever heard of a timing chain failue on a ford pickup. They usually last as long as the rest of the engine. I do not know if the 460 is an interference engine though
.
.
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
I don't know what the failure rate on the timing chain is, but theoretically [and realistically for that matter] yes it is possible for the pistons to hit the valves if the timing chain were to break.
Having trouble with that lately?
And I'm not sure what all you need to remove to access the timing chain cover, but once it's removed, this the procedure you use according to my Chilton service manual:
1. Rotate the CRANKSHAFT clockwise to take up slack on the left side of the chain
2. Choose a reference point [a line drawing shows one being used on the gasket surface of the chain cover] and measure the distance from this point and the chain
3. Rotate the crankshaft in the opposite direction to take up slack on the right side of the chain
4. Force the left side of the chain OUT and measure the distance between the chain and reference point- the difference in the two measurements is the deflection [sloop]
The book says if the difference is more than 1/2" the chain needs replacement.
Hope this helps.
Having trouble with that lately?
And I'm not sure what all you need to remove to access the timing chain cover, but once it's removed, this the procedure you use according to my Chilton service manual:
1. Rotate the CRANKSHAFT clockwise to take up slack on the left side of the chain
2. Choose a reference point [a line drawing shows one being used on the gasket surface of the chain cover] and measure the distance from this point and the chain
3. Rotate the crankshaft in the opposite direction to take up slack on the right side of the chain
4. Force the left side of the chain OUT and measure the distance between the chain and reference point- the difference in the two measurements is the deflection [sloop]
The book says if the difference is more than 1/2" the chain needs replacement.
Hope this helps.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I'm not sure about whether or not the 460 is an interference engine. You can check slop by taking off the distributor cap, turning the crankshaft with a wrench clockwise until you reach the TDC mark. Then turn the crank counter clockwise while watching the distributor rotor. Stop turning the crankshaft as soon as the rotor begins to move, then look at how many degrees the crankshaft turned. If it is anything more than 4 or 5 degrees, the chain has too much slop. I don't think you'll have to worry about one breaking, but it would affect performance slightly from the slack.
Thread Starter
|
Freshman User
Joined: Mar 2004
Posts: 44
Likes: 0
From: esc
Trending Topics
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Have never heard of a timing chain break on these motors, they stretch and get sloppy enough to rattle against the timing cover but that's pretty obvious and it takes hundreds of thousands of miles to get that bad.
And as far as I know the D50 uses caged roller bearings like the D44 and D44HD. These too should last the life of the vehicle if maintained regularly.
And as far as I know the D50 uses caged roller bearings like the D44 and D44HD. These too should last the life of the vehicle if maintained regularly.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Truck Tragedies
Joe Kucinski
Posting Guru
Joined: Dec 2006
Posts: 1,639
Likes: 2
just replace the timing chain if you're worried about it it only takes like 3-4hrs it's not a big deal at all to do, and the wheel bearings don't like to be underwater/undermud i have had 2 sets fail on me in the past 3 years
Thread Starter
|
Freshman User
Joined: Mar 2004
Posts: 44
Likes: 0
From: esc
Thanks guys I reread my differential manual and I miss read it the mono beam dana 50 has the sealed bearing again according to the book.
Are these twin i-beam 4x4 axles stout enough for 460 big block 4x4 over rough terrain and pulling trailers off road?
I have a dana 60 ford front axle I could have installed but would rather not do all that monkey business.
Are these twin i-beam 4x4 axles stout enough for 460 big block 4x4 over rough terrain and pulling trailers off road?
I have a dana 60 ford front axle I could have installed but would rather not do all that monkey business.
Thread
Thread Starter
Forum
Replies
Last Post
Space Truckin'
Explorer, Sport Trac, Mountaineer & Aviator
12
Sep 11, 2022 07:01 PM
free59mod
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
8
Nov 23, 2015 10:29 PM
willi
Explorer, Sport Trac, Mountaineer & Aviator
5
Jul 28, 2015 03:47 PM
mando jake
2.6, 2.8, 2.9, 4.0 & SOHC 4.0 V6
1
Oct 21, 2008 10:17 AM
