I have a 2003 PT Cruiser. On cold mornings after sitting overnight the starter on my car would make a grinding noise for a second after the engine cranked. The colder it got the worse the noise was. So I did what everyone says to do and put in a new (used) starter. Now its doing exactly the same thing. When it sits and is cold I get the grinding noise, when it is warm or been running recently I dont.
+1 for @Tester. You might want to inspect the teeth on your flexplate. If they are badly chewed up then they could make the starter gear (bendix) stick as well. Grinding is never good for your starter gear or flexplate.
If the first starter made a grinding noise, that grinding of gears may have damaged the flywheel teeth (which mate with the starter gear teeth), which in turn will make the second starter make a grinding noise. Im not sure if this is the same thing as the flexplate concern mentioned above. Its easy for a mechanic to inspect the flywheel teeth when the starter is removed, and some cars allow you to inspect the teeth even without removing the starter I think.
It would be the same thing if your bicycle chain got damaged and made a ginding noise, so you change to a new chain, but it still made the grinding noise because the sprockets got damaged by the first chain.
Tester: I know thats the answer if your starter is sticking, but this is the second starter. So is it really possible the second starter is sticking in exactly the same way under exactly the same conditions as the first starter? To me that means its probably not the starter. Just go with me here imagine it is not the starter, what else could it be?
There is a starter relay in the Power Distribution Center, which is under the hood on the drivers side that could be sticking. Also, the ignition key could be bad. The flex plate should be inspected.
Edit: After watching the vdo, I still dont understand why it flexes ! lol says something about preventing it from bottoming out, but what does that mean? and why would it be a problem on an automatic and not a manual? Car parts are sometimes very puzzling to us auto-repair diyers.
@Feasle metals have a coefficient of expansion ; i.e. they expand and contract w/temperature. The gears on the starter motor need to mesh perfectly with the teeth on the flexplate (for an automatic, or flywheel if a manual xmssion). A flexplate is like a big flat disc-like-thing. The teeth are on the circumference. When the flexplate is cold, it will have a smaller diameter, so the starter gear will have to reach further to engage with the flexplate teeth. If the flexplate teeth are already ground down a little from before, then with the cold temperature contracting the whole flex plate, the starter gear might not quite reach the teeth. And if the starter gears dont reach far enough to robustly engage, the gear will slip, and make a grinding noise
I have a hard time believing that the same problem is happening with two starters in the same car under exactly the same conditions. Plus the used part is guaranteed to have less than 50,000k on it. Is it possible? Sure. Its also possible that spending 220 dollars on a new starter is going to have the same effect as putting a used starter in nothing, except then Im out 220 dollars.
Well show you how to grind concrete in this post. There are many reasons to grind concrete. For repairs, renovating concrete and for decorative purposes. Concrete can be ground to a polished finish for decorative and maintenance reasons or ground roughly to make a better key for renovating your concrete.
Old concrete will be a bit of a Pandoras box, not knowing what will be revealed by grinding the concrete. You may not be able to get a polished finish on old concrete, but the blemishes and other issues will add character to the finished job.
For general grinding a terrazzo grinder or a single cup grinder will do a decent job. Larger planetary grinders are used by professionals for large jobs with better results. To get the edges and corners of concrete slab ground down, hand held grinders may be used.
The grade of diamond cutting disks used need to match the type of concrete being ground. For hard concrete you need a soft compound for the diamonds and for soft concrete you need a hard compound for the diamonds. If your not sure if your concrete is hard or soft, you can test it. Another way of determining if your concrete is hard or soft is to assess the concrete when you start to grind it. If the grinder isnt doing much to the surface you probably have the wrong diamond compound for for grinding diamonds.
For the DIYer using a single cup concrete grinder is much like using a floor polisher. However when starting a concrete grinder always lift the grinding disk of the ground and lower onto the surface once it is started. Then grind in a sideways back and forth motion and pull back as you grind, never leave the grinder going in one spot.
To get an even surface may require that you grind one way and then at a 90 degree angle to the first pass. You will only achieve a coarse finish with a single disk grinder. These grinders are good for grinding concrete that is going to be resurfaced.
Your dust extraction system can range from a shop vac to a dedicated dust extraction system. For small jobs a shop vac will suffice, use of a separator will help save your shop vac from an early death when concrete grinding. A professional dust extraction system will set you back a couple of thousand dollars, so unless your going into the concrete grinding business you wont be needing this.
After cleaning up you may need to repair parts of your concrete before you proceed to the next step of your concrete grinding project. Fill any cracks or holes and re grind these areas to match the surrounding surface.
There are several options to finish your concrete grind project. You can resurface the concrete with a thin layer of resurfacing compound, or use concrete sealer to put a clear wet look on your concrete. Or you can keep grinding using finer and finer grade diamonds for a polished finish.
How you finish your concrete depends on what type of surface you want and whether the concrete is in the elements outdoors or under cover. Some finishes are not UV stable and are only suitable for interior use.
Looking at these options on how to grind concrete should help you determine if you are capable of grinding your own concrete or not. Small areas such as garages are good size grinding projects for DIYers, anything bigger should be given to professionals to complete.