460 possible timing problems???
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Joined: Jul 2003
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From: Florida
460 possible timing problems???
Hello everyone, I have a 94 F-150 with a 460. I have cobra jet heads a mallory distributor. I was driving down the highway and I heard a bang come from the engine compartment. The truck died and I heard a banging sound which slowed as my truck slowed until I came to a stop. I thought I may have broke a belt but that would be too easy. I had the truck towed home and now it sits in my garage.
The truck turns over but wont start. All my rocker arms move well which tells me everything is moving fine inside. All my spark plugs are getting spark. When I turn the motor over I get a back fire through the carb. I was told that its my timing. But why would my timing go while I was driving down the road?
Any way I took the distributor out to make sure the gear was intact. and now I dont know how to set the timing. I have no indicator on the motor to use my timing light on. I believe I use the marks on my balancer but there is nothing that marks it. I also didnt mark the distributor when I took it out and it has turned. So if someone could please help me I would appreciate it very much. Thanks.
The truck turns over but wont start. All my rocker arms move well which tells me everything is moving fine inside. All my spark plugs are getting spark. When I turn the motor over I get a back fire through the carb. I was told that its my timing. But why would my timing go while I was driving down the road?
Any way I took the distributor out to make sure the gear was intact. and now I dont know how to set the timing. I have no indicator on the motor to use my timing light on. I believe I use the marks on my balancer but there is nothing that marks it. I also didnt mark the distributor when I took it out and it has turned. So if someone could please help me I would appreciate it very much. Thanks.
Postmaster
Joined: Nov 2002
Posts: 3,447
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From: Littleton, CO
It sounds like you are correct thinking timing, however, I would have to go with a problem in your timing chain/gear area. Perhaps you threw a tooth on the timing gear or your chain jumped due to stretch. Anyway, to re-set yourself, place the number 1 cylinder at Top Dead center(compression and both valves shut), put your distributor in and line up the #1 plug wire in the cap with the rotor. Of course you will need to adjust a little for timing advance, but that will get you in the ball park. There should be a tab coming off the timing chain cover to set your timing off of and the balancer should have a 0 to line up with at TDC. It won't however fix your problems of a bad timing chain/gear.
--Mike
--Mike
Last edited by Mike G; Sep 14, 2004 at 04:51 PM.
Elder User
Joined: Mar 2004
Posts: 976
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From: clinton iowa
if its not the timing once you get that set up properly check your coil had a similar situation while driving and a ;oud bang came from under the hood did some checking and found it was the coil
Senior User
Joined: May 2004
Posts: 125
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timing slipped on mine too
check out the pics under my gallery! Right after I bought my truck, it would stall out every once in a while, and a couple times it popped and then acted like it threw the timing chain. But most of the time it ran good, just didn't have any power (for a 460).
I finally got tired of that, and got it diagnosed at a local shop. turned out the tining gear KEYWAY was so wore out, the timing was wandering almost 40 degrees!!! replaced the timing chain and gears ( at a cost of about $80.00)
and now she runs very strong!!
IT was actually al lot easier than I thought it would be to change, even with P/S AND A/C. Took about 4 hrs.
Good Luck!!
I finally got tired of that, and got it diagnosed at a local shop. turned out the tining gear KEYWAY was so wore out, the timing was wandering almost 40 degrees!!! replaced the timing chain and gears ( at a cost of about $80.00)
and now she runs very strong!!
IT was actually al lot easier than I thought it would be to change, even with P/S AND A/C. Took about 4 hrs.
Good Luck!!
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