grinding sound when shifting to reverse

[ravelcop]

mga bossing, have you encountered hearing a grinding sound while shifting to reverse? i thought na normal lang yun but as i could hear it, parang hindi nagmemesh ang gears niya kaya meron grinding sound when i shift to reverse. although dun lang sya umiingay, pagkapasok na, ok naman ang takbo. What i was wondering is, hindi sya nangyayari always, most of the time lang. merong times naman na hindi ko maipasok to reverse. so what i would do is binibitawan ko muna ang clutch, then step on it again, then kambyo ko ulit to reverse. then i would hear that grinding sound for a second tapos pasok na sa reverse. weird no? natatakot na ko coz tunog talaga ng gears ang grinding sound.