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Old 02-05-2002, 02:02 PM   #1
lstepnio
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Member#: 10972
Join Date: Oct 2001
Chapter/Region: South East
Location: Tampabay, Florida
Vehicle:
2004 STi (fuxor3d!!)
2004 Forester X

Default grinding gears

I started to grind into 4th gear about once a day for the past several weeks now. My WRX has about 5000/miles without any "abuse". I don't really think it's human error, I have been driving a manual car for a long time and it's been very rare of me to grind a gear. At first I thought it could be me simply being sloppy, but I'm starting to think now that it just might be the car.

The car is stock w/ the exception of a kartboySS. My question is what defect/problem in which part(s) can cause gears to start grinding in a manual transmission?

Just for the record, my wife has complained about some light gear grinding in our new Acura RSX too. None of my older cheapo Nissan, Isuzu, or Honda's that I have owned in the past had any problems with gear grinding unless it was due to sloppy human error. What gives? I'm just really hoping none of our girls are getting sick on us.
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Last edited by lstepnio; 02-05-2002 at 09:06 PM.
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Old 02-05-2002, 02:39 PM   #2
Stallion
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Please keep in touch with me, I am in the middle of dealing with the same problem. Subaru is not covering my car under warranty. Please PM me and we can switch vin numbers to show to SOA the same thing is happening.
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Old 02-05-2002, 09:24 PM   #3
lstepnio
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2004 Forester X

Default

That's really not what I wanted or needed to hear. I honestly do wish you the best of luck. I'll keep you posted if anything becomes of this on my car.

I have faith that if my car does have any legitimate problem, SOA along with my local service department would do everything possible to help. I had my clutch replaced due to the decel clutch noise that has been posted on this board. Everything in my experience was handled way beyond my expectations with minimal hassles on my part. The only hassle was that I had to drive a old-smelly-dumpy-ghetto-loaner(tm) Outback for a day.

I'm going to need an oilchange soon and I plan to mention my concerns at that point. I don't think I'm ready for anyone to pull my transmission apart for a diagnoses or anything drastic. I just want to know how "normal" this is with the WRX, or could there be a real problem developing.

Last edited by lstepnio; 02-06-2002 at 12:05 AM.
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Old 02-05-2002, 11:45 PM   #4
Jung918
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I have been having the same problem. I also thought that it was due to not pushing in the cluth all the way. However I have been pushing in the cluth all the way everytime and double cluth and every now and then it does grind. More like once a week or so. I guess i will have to bring mine in to the dealership also. DO you guys also have a problem when trying to put the gear into first after you stop?
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Old 02-06-2002, 01:05 AM   #5
Stallion
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I apologize, Istepnio. Check your e-mail, I sent you a message. I will explain to the best of my ability the technical reasons for this. What you are hearing is the hub teeth on the 4th gear being ground down due to the incorrect alignment of it and a drive gear. The hub teeth are not the teeth you see that go around the circumference of the gear, they are smaller teeth protruding from the side of the gear. When shifting, there is a brass syncronizer that aligns these hub teeth with the teeth from another drive gear in order to shift from third to fourth gear. The syncronizer has teeth shaped just like the hub teeth on the gear being selected, and helps the two gears mesh together. If this syncronizer is not operating correctly, or has been damaged, it will not allow the gear to engage without a grind. The extent to this grind depends on the malufunction or the damage to the syncronizer. Powershifting, as well as downshifting from high speeds will wear the syncronizers down because you are ripping one gear directly into another, and in the process sandwiching the soft syncronizer inbetween the incredibly hard gears and possibly scarring or damaging its soft form as you yank on the gearshift(or it will slide right in depending on your revv matching skills).
In my car though, the syncros were not damaged, and there was only slight wearing on 1st and 4th gear. This shows that the syncros were not functioning properly and not aligning the gears as I up or downshifted, resulting in a grind and wear on the gears. My 3rd to 4th upshift would always engage into gear, but it would always scrape as it went in. 2nd on the other hand would never go into 1st unless I was stopped, and it would sometimes grind even then, yet the syncro was unscarred and untouched. Why this was happening, I have no clue, but I am sure it has something to do with the tranny design.
I hope this is more what you were looking for, and if anyone sees something wrong in my description please help me out as I am new to trannies. Again, I apologize for being short in my last post, I was on lunch break and concerned to see someone with the same problem.
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Old 02-06-2002, 01:24 PM   #6
bbbradley
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BRG-ish

Default Re: grinding gears

Quote:
Originally posted by lstepnio


Just for the record, my wife has complained about some light gear grinding in our new Acura RSX too.
Does your wife use that thrid pedal when she shifts?

I've been reading a bunch of posts on tranny issues, I also see how many people have SS kits or made changes to the bushings. I wonder if there is any correlation here? I have a feeling that if I buy a WRX the stock shifter will remain in place until the warranty is up.

/bill
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Old 02-06-2002, 11:28 PM   #7
Curtis
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Aspen White

Default Check your clutch slave cylinder for leakage

About a week ago my wrx started grinding when shifting into first gear from a dead stop. Like at a red light or whatever, shifting from neutral to first with the clutch pushed to the floor, grrr-clunck! It repeated several times. I took it to the dealer the next day, handed my bud the keys, told him what it was doing, and asked him to drive til it did it to him. 5-10 minutes later, grrr-clunk. They put it on the rack and pulled the dust boot back on the slave cylinder, and drip!

So, a slave cylinder is on order and will be replaced this week.

Note: This grinding problem my car has is intermittent. It is caused by a loss of pressure on the hydraulic side of the clutch system. Ask them to check for leakage at the slave cylinder dust boot. Warranty repair, no problem.

Curtis

Oh yeah, got 5500 miles.
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Old 02-07-2002, 03:02 PM   #8
Choose
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Platinum Silver Metallic

Default

lstepnio and Stallion,

Check out my 5th gear issue:

http://www.i-club.com/forums/showthr...hreadid=130057


Hope that this can help!!!!
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