civicb1812345

ok so i have a few questions, i have a 92 cx with a ls vtec swap, i have recently aquired a grinding noise, i ripped a cv boot a week before it started happening, so i figured it was the cv, but nope that wasnt it. replaced with a new one its still there, its only noticable in high load in 1st,2nd, and sometimes 3rd, only when im in it hard, if i take off normal shifting at 3-4k rpms i cant hear it. any ideas?

Relington

Does the noise come and go when u engage or release the clutch ? I had a similar problem and it turned out to be shaft bearing

civicb1812345

i just said its only under high load while accelerating in 1st or second. its not the isb. no noise while idling with clutch in or out

Former User

Try to be more respectful of members trying to help you. Otherwise, you'll get limited responses.

Post a video in which members can hear the grinding noise.

NotARaCist

iTrader: (1)

How many miles are on the transmission? High RPM grinding in specific gears points towards sleeve and/or synchro failure.

civicb1812345

didnt mean to be rude about it, i dont think its a syncro problem, if i take it upstairs easy it doesnt do it, ill try to get a video ron but i doubt youll be able to hear it over my exhaust

civicb1812345

it doesnt seem like a gear thing its just high load, i could be wrong but im not replacing a tranny as my first attempt to fix it,

Former User

Have you checked all the exhaust heat shields?

civicb1812345

i have removed all of the heat shields. did that when i put my exhaust on, sounds like it is coming from front suspension area, and is really loud when i shift hard, i tried to video it but all you can hear is exhaust and intake.

civicb1812345

i have checked all my steering linkages/tie rods/wheel bearings and they all seem good.

civicb1812345

only thing i noticed of is i am missing the flywheel inspection plate

civicb1812345

bump... any ideas?

civicb1812345

bump...

civicb1812345

bump

TomCat39

Being that first and second gear is on the main shaft while third and fourth are on the secondary shaft, it very well could be a bearing on the main shaft, whether it's ISB or one of the back side shaft bearings. You said under heavy load at high rpm in first and second only. Or as NotARacist said, could be synchro or sleeve related.

Not sure how you are ruling all of these out without ever cracking open your transmission and inspecting and measuring is beyond me.

Too bad you don't have a dyno so you can load it up at 3K rpm without actually moving. Then you could stick your head under the hood and listen around.

civicb1812345

i have a dyno accesible about a mile from my house, but utll cost alot to use. lol

civicb1812345

bump

NotARaCist

iTrader: (1)

At the end of the day, it's a safe bet that it's transmission related, and you should go ahead and crack the case. Buy/borrow/download a factory service manual for your car - it'll include the very detailed process of dismantling the transmission, measuring everything, and reinstalling it all again. Some basic hand tools, a few extensions, and a full set of feeler gauges should be all you need.

THE GREEN CRX//

it could be the clutch adjustment, I know my third gear grinds almost all the time because its not adjusted right, its probably drivetrain