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Old 11-12-2011, 03:27 PM
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Seat belt don't lock up.

I have mounted 3 point seat belts from a 93 Mustang in my 34 Ford.
They are used, but looks good and rolls freely and nice.
Are these belts hard to lock up just by pulling the belt quickly by hand?





Before mounting I tested the function by holding the retractor in one hand and the belt in the other hand (retractor leveled like in the donor car) and pulled them quick away from each other. Then it locked up every time.

Now when the retractor is fastened in the car (retractor still leveled like in the donor car) it's very difficult to make the belt lock by pulling the belt quickly.
Everyting still runs freeliy and nice.

Is this how it is supposed to be?

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Last edited by staleg; 11-12-2011 at 03:46 PM.
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Old 11-12-2011, 04:01 PM
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Most of the new US made cars rely on a pendulum movement of a locking arm to the ratchet or toothed wheel. This in turn allows the typical white haired older person to get in the car, pull the belt forward to latch. It's supposed to work with a sudden stop - like against a tree and prevent you from going through the windshield.
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Old 11-13-2011, 02:13 AM
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Thank you for your answer.
If I understand you correct: The belt will not lock up if not the retractor get a sudden movement?

I had something like that in mind, but wasn't sure.

Last edited by staleg; 11-13-2011 at 02:19 AM.
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Old 11-13-2011, 06:47 AM
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That's correct. I tried to edit my first post with this but the laptop "died":

"Locking retractors

Most modern seat belts are stowed on spring-loaded reels called retractors equipped with inertial locking mechanisms that stop the belt from extending off the reel during severe deceleration. There are two main types of inertial seat belt lock. A webbing-sensitive lock is based on a centrifugal clutch activated by rapid acceleration of the strap (webbing) from the reel. The belt can be pulled from the reel only slowly and gradually, as when the occupant extends the belt to fasten it. A sudden rapid pull of the belt as in a sudden braking or collision event causes the reel to lock, restraining the occupant in position. A vehicle-sensitive lock is based on a pendulum swung away from its plumb position by rapid deceleration or rollover of the vehicle. In the absence of rapid deceleration or rollover, the reel is unlocked and the belt strap may be pulled from the reel against the spring tension of the reel. The vehicle occupant can move around with relative freedom while the spring tension of the reel keeps the belt taut against the occupant. When the pendulum swings away from its normal plumb position due to sudden deceleration or rollover, a pawl is engaged, the reel locks and the strap restrains the belted occupant in position"

From: Wikipedia.

The second one is what Ford traditionally used with at least '80s onwards in most Mustangs.

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Old 11-13-2011, 09:40 PM
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The point is the belt has to be mounted exactly as it was in the donor car. If that belt was mounted to the rear package tray for instance with the bracket going vertical and the bolt going horizontal unlike how you have mounted it, the weight inside the belt isn't going to swing properly to work.

It has to be mounted EXACTLY as it was designed and bolted in the donor car. Are you sure that is how they were mounted, they don't look like anything I remember. Where were they mounted in the car?

Brian
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Old 11-14-2011, 03:29 AM
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The belts are from the rear seat on a 90-93 Mustang convertible.
I have tested the function with the retractor in different positions.
The only position the belt is possible to pull out at all, is with the retractor fastening bolt mounted vertical.

On Ebay I found these parts:
http://www.ebay.com/itm/1990-1993-MU...item5645ba5ebc

It is 90-93 Mustang body parts for rear seat belt retractor mounting. Judging from the look of these parts I would say chances are big for that a vertical position of the fastening bolt is correct.

But if some of you have further knowledge about the fastening of rear seat belts on 90-93 Mustang, I would of course appreciate such information.
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