1. Saib lub ntsej muag. Cov ntawv luam lossis cov lus pov thawj thiab cov cim ntawm cov tsos ntawm cov khoom qub yog qhov tseeb thiab raug cai, thaum lub ntsej muag ntawm cov khoom cuav yog ntxhib.
2. Raws li cov xim, qhov saum npoo ntawm qee qhov qub yuav tsum tau teev nrog qee yam xim. Nyob rau hauv cov ntaub ntawv ntawm lwm yam xim, lawv yog fake thiab shoddy qhov chaw.
3. Saib qhov kev ntxhib los mos. Cov ntaub ntawv ntawm cov khoom siv tseem ceeb yog cov ntaub ntawv tsim nyog raws li cov qauv tsim, thiab feem ntau ntawm cov khoom cuav raug hloov los ntawm cov khoom pheej yig thiab cov khoom tsis zoo.
4. Saib xyuas cov neeg ua lag luam txhaum cai uas tsuas yog ua cov khoom pov tseg, xws li disassembly, sib dhos, sib dhos, pleev xim, thiab lwm yam, thiab muab lawv muag raws li cov khoom tsim nyog kom tau txais txiaj ntsig siab.
5. Look at the "engagement". If the rivets of the clutch plate are loose, the brake hose is degummed, the joints of electrical parts are desoldered, and the joints of the paper filter element are separated, it cannot be used.
6. Look at the identification. Some regular parts are marked with some marks, such as timing gear mark, piston top mark and other assembly marks, which are used to ensure the correct installation of parts. If there is no part, you can't buy it.
7. Look at the "storage" of auto parts. If there are problems such as dry crack, oxidation, discoloration mirror or aging, it may be caused by poor environment, long storage time, poor material itself and so on.
8. Saib ntawm lub ntim, lub ntim ntawm cov khoom siv tseem ceeb feem ntau yog tus qauv, kev sib koom ua ke tus qauv, thiab cov ntawv luam tawm yog qhov tseeb thiab raug cai. Txawm li cas los xij, kev ntim khoom thiab luam ntawv ntawm cov khoom cuav yog qhov tsis zoo, thiab feem ntau nws yooj yim pom qhov tsis zoo hauv lub ntim.
9. Qee qhov tseem ceeb, tshwj xeeb tshaj yog cov rooj sib txoos, xws li carburetor, distributors, generators, thiab lwm yam, feem ntau xa nrog cov lus qhia thiab daim ntawv pov thawj los qhia cov neeg siv hauv kev teeb tsa, siv thiab tu. Yog tias tsis yog, lawv feem ntau yog cov khoom cuav thiab tsis zoo.
10. Look at the protective layer. In order to facilitate storage and prevent parts from bumping, the parts have protective layers before leaving the factory. For example, bushings, large and small bearing shells, pistons and valves are generally protected with paraffin to avoid surface damage. If there is no protective layer on the surface of these important accessories, they are mostly "parallel goods".
11. In order to ensure the smooth posturing and normal operation of the vehicle, the normal assembly parts must be complete and intact. Individual small parts on some assemblies are missing, which are generally "parallel goods", which makes it difficult to load. The whole assembly is often scrapped due to the shortage of individual small parts.
12. Thaum yuav khoom pib raws li cov kev qhia tshwj xeeb, nws yog ib qho tsim nyog yuav tsum paub txog cov txheej txheem tseem ceeb, thiab cov cuab yeej tshwj xeeb yuav tsum ua kom tau raws li qhov yuav tsum tau siv. Cov tsos ntawm qee cov khoom cuav thiab shoddy yuav luag tib yam li cov khoom tiag, tab sis nws tsis tsim nyog rau nruab lawv. Lawv yog cov loj lossis me dua. Lawv ib txwm tsis txaus siab rau lawv txoj kev siv thiab tawm hauv qhov tsis txaus ntseeg ntawm kev sib tsoo.
13. Cov tsos ntawm cov khoom siv nrog kev ua haujlwm tsis zoo yog qee zaum zoo, tab sis vim yog kev tsim khoom siv tshuab tsis zoo, cov kab nrib pleb, cov xuab zeb qhov, slag inclusions, burrs los yog pob yog ib qho yooj yim los tshwm. Piv txwv li, lub tog raj kheej gasket yog extruded thiab deformed, uas yog ib qho yooj yim los ua ablation vim xoob sealing, ua rau cov roj to, huab cua thiab dej to; Muaj burrs ntawm qhov chaw ua haujlwm ntawm piston thiab lub nplhaib piston, uas yooj yim rau rub lub tog raj kheej.