1970 - 72 and early '73 914s with a 4732900-- serial number suffered from poor window mechanisms. The problem was corrected wonderfully in 1973, but unfortunately, all 914-6 owners and we early 914-4 owners have to suffer somewhat.
The windows can successfully be adjusted to fit, but we first need to make some preliminary determinations and repairs (in no particular order):

1. Since this particular mechanism used glued-on guide rails instead of window felts, it is very important to make sure the guides have not loosened. The front guide is firmly glued to the front edge of the window and four rollers are attached to it. In the rear, the bottom corner has glued to it a combination steel/plastic guide. Often the rivets break and the part falls apart and into the bottom of the door. This causes the window to cockeye in the track. Rerivet the part and glue firmly to the rear lower corner of the glass. Grease both the front and rear window guides.

2. The window regulator button: Originally snapped onto the regulator guide pin, this button slid front and rear in a horizontal channel, pushing the window up or down. With this small button bearing the weight of the window glass, it was bound to fail. As the regulator strained to push up a stiff window in dirty loose window guides, the button would pop off the regulator pin and the window would come crashing down, usually shattering into a thousand pieces. Since this button is not available without purchasing a complete window regulator, we purchase an excellent reproduction from Dennis Deeds of the 914 Owners' Association, install it, pin it with a cotter key so it will not be able to pop off and lubricate the horizontal "C" channel.

3. The window regulator: Clean with solvent and thoroughly oil (not grease!)

4. Chassis sag: This causes a tight door gap and very tight upper window fit. The sag can be caused first by rust or just by age (on a rust free car). The solution is to either replace the rusted panels and/or pull the chassis on a frame machine. We have had to pull several cars to achieve proper door/window adjustment even though these 914s had never been wrecked or rusted. Check door fit carefully starting at the front. Make sure the door aligns with the cowl and the gap is perfectly uniform to the front fender. Make sure the door and fender make one perfect curve (you can check this with a plastic straight edge). If in perfect alignment in the front, check the rear. The door should fit evenly top to bottom with uniform crack (above the door latch, the gap will naturally be wider). Ignore the latch cup fit as the alignment here is always off. Finally, check door to quarter panel smoothness.

5. Vertical roll bar and top side seals: if not fresh and factory originals, a good glass seal cannot be obtained. Make sure the top is squarely latched into the windshield frame and onto the rollbar. Most aftermarket seals fit poorly and as adjustment becomes critical, they fail to comply. Close the rolled up window against the seal to check for uniform front to rear contact. Since the glass cannot be bent, if uniform seal is not achieved the seals are mismounted. Adjust or bend their attachment gutters.

A. Rear window guide cap. This holds tight the rear glass when it is rolled up. If broken or missing, the window will rattle with looseness and not seal.If all of the above is corrected, window adjustment is easy:

1. The anodized front window guide adjusts forward backward in and out by way of a 13mm nut and slotted adjusting lug sunk into the bottom inside edge of the door (no reason to remove the door panel). This adjustment will move the glass toward or away from the top side seal or higher in the front or lower in the rear or vise-versa. If the anodized divider is factory correct, the upper black vent window cap rests easily into the windshield top seal with its edge and the seals edge in alignment.

2. Window stop: at front edge of door underneath at the front of the window regulator, it allows the window to roll up higher or lower. Perfect height is when the vent window cap and front glass make a smooth curve together (loosen, adjusting screw for height and tighten to shorten).

3. Rear window guide: adjusts with two phillips screws at the rear bottom of the door. It allows the rear of the window to be adjusted in or out.The above operation should achieve perfect window fit on all 70 - early 73 914 models. Always keep the window guides lubricated and the window seals lubricated with silicone grease.

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