Chain jumped???

Reply Subscribe

Thread Tools

Search this Thread

Nov 15, 2005 | 02:01 PM

flyflinger

Thread Starter

Senior User

Joined: Aug 2003

Posts: 177

Likes: 0

From: Beaverton OR

Chain jumped???

Truck started running really bad. I can t keep it running and it is backfiring all over the place. I give it gas and it doesn't accelerate. As it starts to rev up it hits a point and then backfires. Then re-revs and backfires. Is it time for a new timing chain? Can I tell without removing the timing chain cover? I would like to avoid a day long job.

Nov 15, 2005 | 02:14 PM

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

my first guess is the roll pin broke on the dizzy. start there, then remove the fuel pump and check the chain slack.

Nov 15, 2005 | 02:27 PM

rusty70f100

Post Fiend

Joined: Jan 2003

Posts: 8,600

Likes: 4

From: Iowa

Check your timing. If the chain jumped or the pin broke, your timing will be way off.

Nov 15, 2005 | 02:46 PM

flyflinger

Thread Starter

Senior User

Joined: Aug 2003

Posts: 177

Likes: 0

From: Beaverton OR

How do I check on the roll pin. That is a new term for me. Do I just pull the dizzy and look at something?

Nov 15, 2005 | 02:49 PM

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

the roll pin keeps the gear on the bottom of the dizzy inplace. they break and the timing is way off.

Nov 15, 2005 | 02:50 PM

fordraceboy

Posting Guru

Joined: Oct 2005

Posts: 1,235

Likes: 2

pull the distributor and the roll pin is what goes through the shaft to hold the drive gear on... check your timing before you pull the distributor though...

Nov 15, 2005 | 02:51 PM

flyflinger

Thread Starter

Senior User

Joined: Aug 2003

Posts: 177

Likes: 0

From: Beaverton OR

Is it fixable, or do I just replace the whole dizzy

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

Top 10 Ford Truck Tragedies

Joe Kucinski

Nov 15, 2005 | 03:07 PM

rusty70f100

Post Fiend

Joined: Jan 2003

Posts: 8,600

Likes: 4

From: Iowa

That never works. Go get a timing light if you dont have one.

Nov 15, 2005 | 03:12 PM

#10

flyflinger

Thread Starter

Senior User

Joined: Aug 2003

Posts: 177

Likes: 0

From: Beaverton OR

I have a timing light, but i'm not sure it will run long enough to check it.

Nov 15, 2005 | 03:17 PM

#11

fordraceboy

Posting Guru

Joined: Oct 2005

Posts: 1,235

Likes: 2

doing it that way leaves the possibility of being 180 out... if it wont run long enough though you will have to do it that way... so just make sure it points at #1 or #6 when you get er' lined up... if the roll pins broke you'll have to fish the gear outta the motor most likely, i just had to do that on a small block chevy- a 3/8 long ratchet extension with a couple of wraps of black electrical tape workd perfect if you dont got a extendable magnet.. LOL the things one can come up with in a pinch right? if the pins gone you probably will want a new gear, they get chewed up pretty bad when everything isnt right...

Nov 15, 2005 | 04:50 PM

#12

bertha66

Lead Driver

Joined: Oct 2004

Posts: 8,062

Likes: 35

From: Central Oregon

If the roll pin breaks the engine most likely will not run at all. If timing was 180 out, engine will not run. If the timing chain did jump, it will run, but not good. Setting up the engine on TDC on the firing stroke and looking in the dis. is a good way of checking. Doing this the dis. should be pointing at #1.