Timing jumped?
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Joined: Apr 2006
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From: Kansas City, KS
Timing jumped?
1979 F150 4x4 351m C6.
I took it out for a tour of Missouri yesterday.
Timing has always been a bit "wrong" on this truck.
After nearly driving OVER a Toyota yesterday, I found myself in an odd spot, and had to floor the truck to try to avoid cutting someone else off.
Oops. Bad plan.
It lurched, almost died, and hasn't been right since. It made the trip home, but was overheating (slightly), missing (a LOT) and chugged up every hill regardless of how slight the incline.
Do you think I jumped a tooth on the timing chain? Finally spun one of the nylon timing gears?
Or am I just paranoid and should keep on driving til it dies?
I took it out for a tour of Missouri yesterday.
Timing has always been a bit "wrong" on this truck.
After nearly driving OVER a Toyota yesterday, I found myself in an odd spot, and had to floor the truck to try to avoid cutting someone else off.
Oops. Bad plan.
It lurched, almost died, and hasn't been right since. It made the trip home, but was overheating (slightly), missing (a LOT) and chugged up every hill regardless of how slight the incline.
Do you think I jumped a tooth on the timing chain? Finally spun one of the nylon timing gears?
Or am I just paranoid and should keep on driving til it dies?
Laughing Gas
Joined: Mar 2007
Posts: 754
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From: southwest Wisconsin
You could put a timing light on it and see if the timing has "moved" for no reason since you set it. Might be a good idea to make sure fuel filter and fuel pump are OK, not enough fuel can cause the problems you discribe.
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From: Kansas City, KS
Originally Posted by fastfarmer
Might be a good idea to make sure fuel filter and fuel pump are OK, not enough fuel can cause the problems you discribe.
Where is the fuel filter on this truck? Is it in the tank?
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From: Kansas City, KS
Good idea. I thought you were only supposed to turn the crank in one direction...is it OK to go back and forth with it?
Logistics Pro
Joined: May 2003
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From: Northern Illinois
Your not actually turning the crank, what you are doing is checking the free play in the timing chain. It also does not hurt the motor to turn it backwards by the crank bolt. All it takes is to turn it till the rotor starts to move, then go back the other way. It should not take long to move that rotor.
The gas filter, provided it is the OE 2 bl carb, will be screwed into the carb at the gas line inlet. I'm betting it has been changed down the road and has a 5/16" inline filter on it. No fuel filters were put in the tank back then on these trucks.
If you have a timing light you could also hook that up and see how erratic it bounces around.
The gas filter, provided it is the OE 2 bl carb, will be screwed into the carb at the gas line inlet. I'm betting it has been changed down the road and has a 5/16" inline filter on it. No fuel filters were put in the tank back then on these trucks.
If you have a timing light you could also hook that up and see how erratic it bounces around.
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Joined: Apr 2006
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From: Kansas City, KS
Thanks...and yes, I have one. I just haven't put it on the truck in a year or two...I don't drive the truck much...but I'll check it out!
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Logistics Pro
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From: Northern Illinois
Possible but it usually involves a backfire to shear the dizzy roll pin. I suppose it wouldn't hurt to pop the cap off and grab the rotor and see if you can turn it by hand. If you feel comfortable it is easier to pull the dizzy and give it a visual.