The coiled spring is disposed swingably outside the first intake air passage or the second intake air passage, and has a swinging end, which is brought into {HEAD ~ contact} with {TAIL ~ a surface} of the interlocking member 
The coiled spring is disposed swingably outside the first intake air passage or the second intake air passage , and has a swinging end , which is brought into { HEAD ~ contact } with { TAIL ~ a surface } of the interlocking member
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH