valves rattling
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More Turbo
Joined: Aug 2005
Posts: 683
Likes: 6
From: North Georgia
valves rattling
I have a 86 ford 302 efi aod tranny 95k original miles. This truck is all original and nothing ever done to it. It is a real sound truck and runs and drives real good. It does how ever have what I think is a valve rattle when it is lugging from one gear to the next. I am pretty sure it has never had the valve covers off of it and they are in need of some gaskets. Is there a adjustment on these valves to maybe stop this rattling or is it just normal wear.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
No adjustment on the valves there. The noise you're hearing is called "pinging", it's not the valves, it's lots of small detonations colliding with each other in the cylinders. Bad for pistons too. Either run a higher octane fuel or retard the timing some till it goes away. If left alone, it will eventually break the ring lands on the pistons.
Senior User
Joined: Jan 2005
Posts: 121
Likes: 0
From: North Central Montana
YEs it sounds like detonation (pinging). The best bet is a higher octane fuel as others have said.
When you look at the fuel price logically it really isn't that much more as compared to doing a major on your engine.
Around here the medium grade is 10 cents more than the cheap stuff. Thats only $2 more for 20 gallons. If you go 10,000 miles per year and get 15MPG, thats an extra $67 per year.
Now if you used 667 gallons to go that 10,000 miles on regular octane and the medium grade bumped up your mileage by even 1MPG you can go an extra 672 miles on the same amount of fuel per year.
So what did it cost? That 672 miles saved you 42 gallons of gas, at an average rate of $2.10 per gallon that would have cost you $88.2. The difference between what you saved and what you spent is $21.2, thats what you saved by using higher octane.
That example was with only a 1mpg increase, it wouldn't be out of the question to get an increase or 2 or 3MPG.
So for me, it's easy to afford the $21 savings as opposed to spending $1000 rebuilding the engine.
When you look at the fuel price logically it really isn't that much more as compared to doing a major on your engine.
Around here the medium grade is 10 cents more than the cheap stuff. Thats only $2 more for 20 gallons. If you go 10,000 miles per year and get 15MPG, thats an extra $67 per year.
Now if you used 667 gallons to go that 10,000 miles on regular octane and the medium grade bumped up your mileage by even 1MPG you can go an extra 672 miles on the same amount of fuel per year.
So what did it cost? That 672 miles saved you 42 gallons of gas, at an average rate of $2.10 per gallon that would have cost you $88.2. The difference between what you saved and what you spent is $21.2, thats what you saved by using higher octane.
That example was with only a 1mpg increase, it wouldn't be out of the question to get an increase or 2 or 3MPG.
So for me, it's easy to afford the $21 savings as opposed to spending $1000 rebuilding the engine.
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