Details
A highly-illustrated (over 400 illustrations and photos) failure analysis guide for automotive and off-road vehicle parts. Lots of pictures and descriptions of common machine parts failures. Main topics include: Pistons, Rings, Cylinder Liners, Gaskets, Journal Bearings, Valve Gear Train, Turbochargers, Gears, Shafts, Axles, Spindles, Universal Joints, Hydrostatic Transmissions, Anti-Friction Bearings, Belts, Chains, Tracks, and Tires.
| Author: | John Deere |
|---|---|
| Format: | Paperback |
| Pages: | 202 |
| Excerpt: | SCUFFING AND SCORING "Scuffing and scoring (adhesive wear) is caused by too much heat. When two metal parts rub and the heat builds up to the welding point, a small deposit or "hot spot" of metal is pulled out and deposited on the cooler surface. "Scuffing leaves discolored areas on the surface of rings, pistons and cylinder walls. "Scuffing starts as tiny surface disturbances. If they are not removed, scuffing spreads and becomes noticeable and more severe. It is then called scoring. Any engine condition which heats rubbing parts to the welding point, or which prevents the transfer of heat from these surfaces, influences scuffing. "The following are possible causes of scuffing and scoring: * Improper warm-up "Occasionally an unusual wear pattern results from a misaligned connecting rod. Contact with cylinder wall shows on the bottom of the skirt at left, and at the ring lands on the right (arrows). There is also a diagonal wear pattern extending across the skirt of the piston. This uneven wear is due to a bent or twisted connecting rod or shaft. When connecting rods are misaligned, rings do not have proper contact with cylinder wall, pistons wear rapidly and unevenly, oil consumption is excessive and the engine is prone to scuff or score. Always check rod alignment. |
| Table Of Contents: | PISTONS, RINGS, CYLINDER LINERS AND GASKETS JOURNAL BEARINGS VALVE GEAR TRAIN TURBOCHARGERS GEARS SHAFTS, AXLES, SPINDLES, AND UNIVERSAL JOINTS HYDROSTATIC TRANSMISSIONS ANTI-FRICTION BEARINGS BELTS AND CHAINS TRACKS AND TIRES MISCELLANEOUS FAILURES |
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