Timing Clatter
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Laughing Gas
Joined: Jan 2004
Posts: 960
Likes: 5
From: Spring Texas
Timing Clatter
Hey guys. My 93 F150 with a 5.0 engine recently had a distributor failure so I had to have it replaced. I was out of the state when it happened and my daughter has had the truck since it got back from the shop. I got in it this morning and I noticed that there is a lot of timing clatter when I gave it the gas. I had to take it to the shop for the water pump so I mentioned it to the garage and after they changed the water pump they said that yes there is timing clatter but that the timing is set dead on 10 degrees which is factory spec. I tried to explain to him that that all depends on sea level of the vehicle and the type of fuel. Its obvious the truck is running lean. I am going to retard the timing but I am a bit shocked that the garage refuses to adjust to timing to make it run properly. Does anyone else have a problem with this clatter? He said some crap about the timing chain stretching and I said that I drove the truck the day before the distributor went bad and it did not clatter then. What do you guys think I should do?
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Laughing Gas
Joined: Jan 2004
Posts: 960
Likes: 5
From: Spring Texas
Yes, I did verify the timing it dead on 10 degrees and it sound like clattering as you accelerate hard or go into passing gear. Clack clack, Same as what you would call knocking or lean gas valve clatter. I have not tried to retard the timing yet because I read that the computer is supposed to do that automatically. Its not working.
Logistics Pro
Joined: Aug 2010
Posts: 3,716
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From: Chillicothe
The computer can only do so much in terms of adjustment of timing.
While the timing may be set directly at 10 degrees on the balancer, the balancer may be incorrect. Over the years the rubber ring that is between the inner and outer pieces may have slipped in relation to it's original position. Now it could be any number of degrees advanced or retarded so setting it without checking for actual top dead center is a crapshoot.
My own truck is off. After changing the timing I had severe ping issues. Checked the marks vs using a piston stop to find TDC and found the balancer off close to 4 degree hash mark. So instead of 12 degrees I was at 16
While the timing may be set directly at 10 degrees on the balancer, the balancer may be incorrect. Over the years the rubber ring that is between the inner and outer pieces may have slipped in relation to it's original position. Now it could be any number of degrees advanced or retarded so setting it without checking for actual top dead center is a crapshoot.
My own truck is off. After changing the timing I had severe ping issues. Checked the marks vs using a piston stop to find TDC and found the balancer off close to 4 degree hash mark. So instead of 12 degrees I was at 16
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Don't touch the distributor. It's supposed to be at 10°BTDC for a reason. If you have to retard the distributor for any reason, something else is wrong.
I would first verify that the crankshaft balancer has not spun on the rubber isolator.
I would first verify that the crankshaft balancer has not spun on the rubber isolator.
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fairfield86f150
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Apr 21, 2008 09:43 AM
