汽车挡风玻璃比普通的旧板玻璃窗要坚硬得多，但是经过数千英里的驾驶，它们可以被撕裂，破裂或完全破裂。有时可以修复小芯片，但无法安全地修复严重的裂缝。尽管有可能（如果有点分心）用一辆汽车cracked windshield，在许多州，这甚至不合法 - 如果您的挡风玻璃的破解得很糟糕（检查您州的法律），则需要拥有它replaced。
如果您发现自己处于这个位置，您可能会想知道：我可以自己替换吗？如果您为一些艰苦的工作和可能的挫败感做好了准备，答案被证明是一个精心策划的“也许”。
Make no mistake: replacing a windshield is not a simple matter, and for many people professional installation is worth the cost. You’ll need several specialized tools (some of which can be rented) and various supplies, so if you don’t have these on hand already you won’t save much money.
另外，在进行复杂的维修之前，值得与您的insurance company。Some states require insurance to replace a broken windshield for free (with zero deductible) regardless of what sort of policy you have, and in other states, low or no-deductible windshield replacement is common even when it’s not required.
But if you’re considering doing the replacement on your own, here’s how to go about it. We suggest reading this entire set of instructions, and probably watching a couple of video guides, before deciding whether you’re ready to tackle this repair yourself.
Part 1 of 1: Install a new windshield
需要的材料
- “冷刀”
- Electric knife
- 玻璃清洁剂
- Molding
- 底漆
- Protective gloves
- Razor blade scraper
- 磨垫
- Suction cup window holders
- Urethane
- Urethane application gun
- Urethane scraper
Windshield
Note：比较新的价格和使用挡风玻璃的价格，以确保用过的挡风玻璃的状况非常好。
Note: For many cars, a specialized tool for removing the trim around the windshield is needed; ask your parts store or dealer.
第9部分：拆除挡风玻璃
Almost every car has some sort of trim surrounding the outside edge of the windshield. Usually this needs to be removed very carefully if you’re to avoid damaging it. Don’t just tug on it; check with your dealer or qualified mechanic to see whether there’s a special tool for your particular car; often there is, and the relatively small cost will pay off in a much neater repair.
Step 1: Remove molding。If the molding is simply stuck on, you’ll probably be able to pull it away without a specialized tool.
Unless you’re very careful and a little lucky, you’ll need to buy a new molding to replace it.
Step 2: Remove the rearview mirror and stickers。如果将镜子粘在玻璃上，请卸下后视镜，并小心地刮掉任何注册或检查贴纸。
Step 3: Cut around the windshield。Using your cold knife, work your way around the entire windshield from the outside of the car, cutting through the urethane bead.
Don’t worry about cutting closely, but do be sure not to nick the paint. Work slowly and patiently.
Step 4: Press out from the inside。When you think you’re done, press upward from the inside.
您可能会发现一些斑点仍然卡住。继续前进。
Note: If you can’t get at the entire bead with your cold knife (possibly because the windshield is too close to the metal on one edge), you’ll have to attack the urethane from the inside of the car.
- 警告：使用电刀这要容易得多，但是在不损坏其余汽车的情况下，要做的事情很棘手。
步骤5：抬起挡风玻璃。Once the entire windshield is free, use your suction cup handles to lift it out.
步骤6：划伤内部边缘。If you’ll be installing a new windshield, use a scuff pad to scuff the inside edge where it will stick to the urethane.
If you’ve obtained a used windshield, scrape off the old urethane (ideally leaving a very thin layer, as the new urethane will stick better to it). Scuff any bare spots as you would with a new windshield.
- Tip: Use a specialized glass cleaner to ensure that the windshield is completely clean.
Step 7: Remove most of the urethane bead。Use your urethane scraper to remove most of the urethane bead that remains on the car.
尝试留一层薄层（毫米左右），因为新的尿电烷将粘附在旧的氨基甲酸酯上。
步骤8：仔细检查油漆中的任何划痕。If you see any bare metal, you must apply primer paint to prevent rust down the road.
You can use touch-up paint on any visible scratches after the new windshield is in place. Apply a primer designed to work with the urethane you’ve chose.
- Tip: Apply it to the glass, if the manufacturer recommends that.
Step 9: Cut the urethane tube。切开氨基甲酸酯管的尖端，制成一个三角形孔。
步骤10：施加氨基甲异烷珠。Using your urethane gun, apply a fairly thick, continuous line (called a bead) of urethane all the way around the edge where the windshield will rest.
Overlap the ends of the bead a little when you’ve made it all the way around. It’s critical that the bead be continuous, so check for gaps before moving to the next step.
但是不要移动太慢：根据尿电烷的不同，您可能有大约15分钟的时间来使用它。
步骤11：将新挡风玻璃放置在位。Using the suction cup handles, carefully place the new windshield into position.
放下它后，不要打算将其滑动；相反，您需要第一次将其降低到正确的位置。
尽力在挡风玻璃上一直在玻璃和挡风玻璃凹槽的边缘之间留出很小的缝隙。就是这样，如果您必须再次这样做，您就可以在玻璃和金属之间安装冷刀。
- Tip: You may need to use small spacers (thin strips of wood or cardboard) to keep the windshield from sliding downward.
Step 12: Apply pressure to the windshield。当您满意挡风玻璃在正确的位置时，请以中等压力向下搅拌，一直绕过边缘。
Step 13: Replace trim。Replace any trim or molding you removed — the specifics will vary from car to car.
步骤14：修饰油漆。Touch up any scratches in the paint that you may have caused.
Step 15: Allow the urethane to cure。检查您用于固化时间的尿电烷的规格。
Urethane gets stronger over time, depending on the particular type and on the curing temperature. A typical urethane allows allows about fifteen minutes between application of the bead and installation of the windshield.
Note：一些尿道可以在安装一个小时内安全开车；其他人可能需要更长的时间。最好等到氨基甲酸酯在洗涤后完全固化。这可能是24小时，或者长得多，具体取决于您使用的温度和尿电烷。
警告: Until the urethane is completely cured, it’s advisable not to close the doors hard unless you’ve first cracked a window, because otherwise the sudden rise in air pressure can pop the newly-installed windshield out.
如果您做到了这么远，您要么对入门感到兴奋，要么重新考虑自己进行此修复的计划。如果您要这样做，请前往Auto Parts Store，询问他们最适合您的汽车使用的材料。如果您想帮助了解该过程，Ask a Mechanicfor some quick, helpful advice to give you a better sense of how it works.
