Author Topic: seat belts  (Read 4730 times)

Offline lawdog49

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seat belts
« on: August 10, 2008, 09:21:54 AM »
ok, i have a major safety concern here- all my seat belts in my 91 Burb seem to have the same issue, when you yank hard on them they don't lock, they just pull all the way out.  went to the junkyard yesterday and tried several in Burb's and trucks, they all seem to do the same exact thing.  Can it be that they all are broken, or did the factory seat belts (three point) not lock/retract the shoulder part upon sudden stop?  they seem useless if it doesn't lock when you pull hard on it.  please help!
1991 GMC Suburban 1500   -   5.7/AT/4x4/TBI

Offline VileZambonie

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Re: seat belts
« Reply #1 on: August 10, 2008, 10:03:35 AM »
Posting the exact same thread all over the board is unecessary. One thread is good enough please.


Here are a few bulltins regarding seat belts on the suburban.

The following passenger seat belts operate differently from the comparable driver's seat belt.

 
 
 
 
1. Right front passenger seat belts (Figure 1, Position 1) on:

1988-95 C/K Pickups
1992-95 C/K Crew Cabs
1983-95 S/T Pickups and Utilities


90Chevy35

Number: 91-103-10
 
Section: 10
 
Date: November 1990
 
Corp. Bulletin No.: 061601Subject: ELIMINATION OF PRESENT COMFORT SET FEATURE ON SHOULDER BELT
 
Model and Year: 1991 C/K, R/V, G TRUCKS
 
TO: ALL CHEVROLET DEALERS
 

The purpose of this service bulletin is to notify all Sales and Service personnel of a change in the seatbelt restraint system.

The present comfort feature is being removed from the shoulder belts at all occupant positions in the 1991 C/K and R/V models and from the driver and front passenger position only in the 1991 G Van.

The present comfort feature is replaced with a belt that has a reduced spring load in the retractor motor which results in a minimal but constant force against the occupant's body. Simultaneously, the spring maintains a force adequate to retract and stow the shoulder belt webbing when the belt is not in use.

NOTICE: Users should continue to exercise care during belt release in order to avoid interior damage to the vehicle and avoid twisting of the webbing.
 

Sales and service personnel should be aware of this change in the restraint system in order to address any questions that may occur as a result of the change, and help General Motors continue to promote effective safety belt use.
 

 
2. Left and right rear second seat outboard belts (Figure 1, Position 2) on:

1992-95 C/K Crew Cabs
1995 S/T Utilities
 

The reason for the difference is to allow a child restraint (child seat) to be used in these passenger positions. Child restraints require the lap portion of the seat belt to firmly tighten around the restraint. To accommodate this requirement, belts in the aforementioned positions are equipped with a ratcheting feature activated by pulling the lap belt all the way out. Once the belt has been pulled all the way out, it becomes a one way mechanism that will retract until it contacts a solid object like a child restraint or person, but will not extend again until it has been fully retracted all the way back to the stop button attached to the belt. This feature is often referred to as a child hold out mechanism.

If a passenger finds that the belt becomes tight and uncomfortable while riding, it may indicate that the belt was pulled all the way out during the buckling process, thus activating the racheting feature. This condition can be avoided by taking care not to pull the belt to its very end when buckling up.

Another condition that may occur is the belt not extending when desired. This is often caused by the belt, after having been in the ratchet mode, not being retracted all the way back to the stop. Usually aiding the belt back to the stop by wiggling, removing obstructions, pulling releasing, etc. will allow the belt to once again extend. This condition frequently happens when the shoulder portion of the belt fully retracts before the lap portion of the belt reaches the stop.

All the conditions described above are part of the normal operation of belts equipped with the child hold out mechanism, and will not be eliminated by replacing the belt.
 
 



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Offline biodiesel84

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Re: seat belts
« Reply #2 on: August 10, 2008, 11:11:36 AM »
the seatbelts should have a pendulum weight inside of them that triggers the lock under a sudden stop...to test this, you can take the seatbelt bolt out and lift the seatbelt up on an angle to engage the pendulum lock and see if it works that way...

Chuck.

Offline Captkaos

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Re: seat belts
« Reply #3 on: August 11, 2008, 10:39:35 AM »
As Chuck stated, there is a pendulum in the seatbelt.  Yanking on it to test it isn't how it works.  If you want to test them, slam on the brakes (in a controlled non traffic area) they should hold you in the seat.

Offline lawdog49

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Re: seat belts
« Reply #4 on: August 12, 2008, 10:30:03 AM »
thanks for the help Chris and Chuck!  I was thinking it to be awfully strange why they wouldn't lock out.
1991 GMC Suburban 1500   -   5.7/AT/4x4/TBI