How to lower the back of your hood or front of your trunk.
I have seen this come up on forums for so long and lately there seems to be a run on it so I felt the need to explain this a little different.
There are a number of different hood hinge designs, but they all follow in basically the same general geometry.
Be it this 1965 GM A body.
This 1959 Rambler.
Or this 2003 Dodge Caravan which has only one part and one pivot.
They all follow the same basic geometry in that the pivot point is moved back behind and below the hoods top surface line.
As you can see by my crude drawings I too am in the dark about the exact geometry that is at play in these old hinges but I have the basic idea. Where the exact intersection (pivot point) I donít know but it is something like this.
On my wifeís family truckster (the Caravan) it is very simple, here is the hinge with the hood lowered.
If you were to add a shim between the hinge and the hood on the front bolt like this. It effectively forces the hinge to go down lower right?
When you add a shim between the hood and front of the hinge the hinge is then forced to go down further because the front of the hood will only go so far right?
You can see by this drawing with my paper hinge how when it lowers further like if it is pushed by a shim, it lowers the rear too. You can clearly see that in this model, it IS lower at the rear.
Which results in the hood going down at the rear!
In both of these photos the hood is fully latched at the front and no other adjustments were made.
Now, I understand this is a last resort, you donít want shims showing under your hood. I donít think it is that big of a deal being there are a whole stack of them at your fender bolts not ten inches away, but they didnít have them there from the factory so many of us donít want one there now.
The solution is to rotate your hinge back. Lifting the front higher and lowering the rear. If you wanted to go as far as you could as an example you would loosen all the bolts on the hinge and with the hood open simply push it up in the front opening it as far as it will go while someone tightens the bolts to the fender. At that point the rear of the hood is going to be as low as you can get it without hogging holes in the hinge or shims. Notice how this will make the hinge go further down just as it did on the wifeís truckster hinge.