The biggest pit to buy a used car was when the engine was taken apart, and it looked like it had all kinds of problems as soon as it got on the road. The next approach will help you to see a woman in ten minutes, save you the money and you'll regret it。
Scrap marks on the screw hat
Dozens of screws on the engine will leave a mark if it's removed. With a light on the side of the hand, the prism of the screw hat, if it is sharpened, painted, and has a twisted thorn, means that the screw has been twisted again. Compared to the unmoved screws, the difference can be seen at a glance。
Focused on screws in the three areas of gas chambers, oil casings, and gas intake pipes. If there are a few screw hats in the same area that are worn differently, or if a screw paint color doesn't match the surroundings, then the area must have been opened and the engine is suspected of being broken, so it's time to watch out。
Seal pads and seal tape
The original plant seals are the whole form of flushing, and the edges are clean and there are no excess fillings. If you see a circle of hand-painted seals around the mats, different colours from the original plant, dissimilarly distributed, some of which are thick and thin, then you can almost be judged to have been re-enacted after being removed, not out of the original plant。
Open the cabin board to see a combination of the gas tube and the lid, if there are no glue marks on the cardboard, and the screws are freshly oil-free, but the seal sheet is covered with a lot of seals, and the contradiction of the "paper pad without glue but glued" can almost lock the engine down and show the seller。
Core parts such as arcs of the cylinder
The motive plate was lifted, the surface of the cask was slowly touched with the back of the hand, and the normal form was a uniform cast texture. If an area is clearly smooth and white, it is a scratched mark. The engraving numbers on the axes ' main necks and tiles do not match the original plant, indicating that the core parts were replaced or reprocessed。
The air-gate pole on the inside of the air-gate covers, which had been marked by the manufacturer at the bottom. If the markings are worn out or not in the right position, the air-gate pole is replaced. The difference between the thickness of the corrosive alloy layer and the markings of the main axle tile and the standard values can also support the fact that the engine was operating too heavily, not in its original state。
Maintenance records are the most direct evidence
The maintenance manual, the 4s store manifest, the insurance company's claim settlement records were turned over and the page was carefully turned over. It says "engine overhaul" and "replacer pad" and "branding axes" and you don't have to guess. Without records and without care, some roadside repair plants would not have gone through the formal process at all and would not have left your files。
Ask the owner of a handcar when he had entered the repair plant and what had been done. If the other party is vague, or records are broken, such as a "comprehensive overhaul" of 12,000 kilometres of maintenance, the probability is that the engine was removed and disposed of at that point in time。
Cold-start hearing on the road
In the morning, the cool car set fire, the sound of the normal engine was low and even, and the speed gauge pointer fell back to a steady 800. If you hear sharp metal frictions, silhouettes, or when you're twitching at short speeds, the internal rate of the engine is likely to sound, which is likely to be a hazard left behind by inappropriate fashion repairs。
The block is fast and normal power should be linear. The fact that the speed of the turn is suddenly silent, the speed of the round is accelerated and the speed of the switch falls particularly quickly indicates that the engine is in an abnormal condition. It is clear whether the acceleration has been smooth, marked setbacks and delays。
Multiple cross-certifications are necessary
One can easily be miscalculated, such as a screwdriver wear, which may also be caused by traffic bumps. The correct approach is to go through all five of the screws, seals, cores, maintenance records and road tests, with more than two pointing at the dismantling at the same time. Take a picture of the evidence and put it directly on the table and confront the seller。
If time allows, 50 bucks to find a teacher who's been working for 20 years to take a look, and you can point out the details you're missing in 10 minutes. It would take more than half an hour to do these tests before buying them, which would cost too much than to buy back tens of thousands of engines。
Did you ever get a back stab when you bought a car? The comment section talks about your experience, and the friends who feel useful are sending a compliment to their friends who are watching the car and helping them avoid the mines。
