请教专家，看图

 

问题1：这个应该是overheating，对不对？

问题2：网上查，说可能原因很多。行家们认为那些属于常见原因?

A white colored plug is caused by engine overheating. Failure to repair this engine will result in severe engine damage. Common causes for this are:

Incorrect spark plug (too hot heat range).

Low octane fuel.

Timing is not set properly. 

 

Cooling problems, (dirty cylinder fins, no or low water if water cooled, low or no engine oil). 

Carburetor air/fuel mixture is too lean (too much air). 

Leaking crankshaft seals, no oil, base or head gasket leaks, or crankcase leaks on two stroke engines.

问题3：这样的plug会导致lean还是rich？

 

谢谢

所有跟帖： 

• 回复：请教专家，看图 -biglow- ♂ (455 bytes) () 07/10/2011 postreply 08:10:48

• 班长也在哈。周末好 -满地找牙- ♂ (366 bytes) () 07/10/2011 postreply 08:24:04

• 怎么知道plug的工作温度范围？看说明书？ -满地找牙- ♂ (48 bytes) () 07/10/2011 postreply 08:30:41

• 对了,我可能还有vacumn leak需要fix -满地找牙- ♂ (66 bytes) () 07/10/2011 postreply 08:34:34

• 那就是了 -biglow- ♂ (205 bytes) () 07/10/2011 postreply 08:59:11

• 多谢多谢。 -满地找牙- ♂ (0 bytes) () 07/10/2011 postreply 09:03:12

• sparkplug 还有冷热分别吗？ -triangle- ♂ (41 bytes) () 07/10/2011 postreply 11:03:51

• 自己放狗去查。 -biglow- ♂ (0 bytes) () 07/10/2011 postreply 12:51:54

• EGR堵了8 -bushihandyman- ♂ (0 bytes) () 07/10/2011 postreply 12:14:23

• 买新车了么？ -nissanusedcar- ♂ (0 bytes) () 07/10/2011 postreply 08:50:10

• 正在编写研究报告 -满地找牙- ♂ (0 bytes) () 07/10/2011 postreply 08:56:36

• too lean(too much air). clean fuel system may help. -nonego- ♂ (0 bytes) () 07/10/2011 postreply 17:21:01