Son of a .... transmission....

Discuss the RB20, RB25 and RB26 series engines.
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Kansei240sx
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So i was out driving today, and i went to a friends house to drop off a SR to KA harness, and i wanted to give him a ride, so i get on it in second gear, and shifted moderately fast to somewhat quick into third, and BAM... the shifter shook for a second and the revs dropped to idle, i pushed the clutch in, and the shifter went into third with no resistance at all... as in the shifter bushing felt like it had exploded or something. So i get it back into third and try driving and it starts moving again. We pull off onto the side of the road and i push the clutch in....

In neutral, its still in third, in 4th its still in third, and in 2nd... its something higher becuase the revs drop alot faster the clutch will press in and i can leave the shifter alone and the revs will drop while im moving....

So

A. the slave moves, B. the clutch seems to only let me stay in third gear, and while im moving if i try to put it in any of the other side gears it grinds hard.C. No abnormal noises when it actually happened or even nowD. I dont have neutral

Can someone tell me if they know what might've happened? My car has shifted strong, and never made weird noises other than the T/O Bearing which has always made somewhat of a weird noise. I think the clutch fork may have popped loose or just enough to let the clutch release to idle, but i just dont know... I really need some help here guys. !!


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Kansei240sx
Posts: 1356
Joined: Mon Nov 01, 2004 10:17 am
Car: S13 - RB25 Circuit car
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So i've talked to a few people, and they've said i throw out bearing, along with the clutch for may be my problem, so tommaro ill drop it and find out, but from you're experiances, what do you guys think?

Joe
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Joined: Sun Feb 09, 2003 8:29 pm
Location: Phoenix, AZ

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first thing that came to my mind is something with the shifter/linkage/rods or collars in the transmission. when the clutch goes out it dosent change gear positions like you are describing...

90% chance the transmission has to come off anyway, so might as well pull it and inspect the clutch

rbosacco
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Joined: Sun May 28, 2006 8:26 am
Car: 97 discovery1, 99 yukon, 97 240 rb26 in progress, 72 280se benz 4.5, 03 gti, 98 vr jetta chump car, 91 straight axle 2500 suburban, 00 f350 super duty crew cab 4wd, v70 volvo wagon and a built warrior
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my 2 cent says... bent or broken clutch fork. the grinding when you try to change gears isnt because the clutch isnt working its because it isnt coming out of third gear and yet it is still trying to shift into the other gears and more than likely that is your noise. if it is related to any piece of the clutch assembly you can check by shutting the car off and putting the car in 1st gear if the trans is ok it will shift into first, you might have to push the car forward or backward if the clutch isnt working to line up the gears in the transmission so it would slide into gear but however you do it hold the clutch in and start the car once you get it in first and try to get it to move, if it didnt go into first it isnt the clutch. if it trys to move with the clutch down or shifts easily through all of the gears with your foot off of the pedal something in the clutch assembly took a dump. if you think it might be the shifter bushing pull the console pull the shifter out and look. my bet is an internal problem. it was a used trans anyway. used means worn and being that you werent the one driving it in japan you dont know how worn it was. odds are its broke, and once that kind of stuff starts to happen it is cheaper to just buy a new one than to keep fixing it. if its so worn as to break or bend a shift fork when you weren't even really beating on it. something worse is gonna break as soon as you really beat on it next time. good luck and i found new trans's on here somewhere for 1700, so its not that bad for the peace of mind that comes with a new trans.

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Kansei240sx
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Thanks man, what you said sounds exactly like my clutch fork becuase the symptoms you described, is exactly what i did, it goes into all the gears, and i did the rolling thing bla bla bla, and it goes into the a couple of the gears easy as hell and others are normal. So tommaro im pulling the transmission and taking a look at the fork. Becuase the fork wasnt the greatest thing i'd ever seen either, i know the throw out bearing was torn to ****, which is why i replaced it, So this is sounding more and more like a fork problem. Thats some good news, but we wont know till i get that sucker off.

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Kansei240sx
Posts: 1356
Joined: Mon Nov 01, 2004 10:17 am
Car: S13 - RB25 Circuit car
71 240z - street/track day car
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So i finally got some time to mess with my car last night and look around for problems.

My dad needed to move my car and i was asleep so i just told him were the keys were...

Later after i get up he was like, jesus christ, i could barely move your car back three feet. I was like... yeah... OH ****... its still stuck in third!!!

So i go outside and i see a nice basketball size puddle where my car was sitting that had partially dried away but was still embedded into the driveway. I go sit down inside my car, put the shift lever into neutral and push the clutch pedal down and bam, no pressure at all, i go outside the car and reach to the slave cylinder and i could move back the rod with my hands and even pulled it away from the clutch fork... So yeah.. I have a bad slave or master cylinder from the leaking fluid.

Considering i have had those and beat them down for 3 years, ill just replace both of them bleed the clutch and give it a shot.

rbosacco
Posts: 92
Joined: Sun May 28, 2006 8:26 am
Car: 97 discovery1, 99 yukon, 97 240 rb26 in progress, 72 280se benz 4.5, 03 gti, 98 vr jetta chump car, 91 straight axle 2500 suburban, 00 f350 super duty crew cab 4wd, v70 volvo wagon and a built warrior
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so if you move the shifter into nuetral is it in nuetral? or is it stuck in third?what if you try to pull it back into 2nd or 4th? and keep in mind i want you to try this with the car off and dont touch the clutch. just pull the shifter. does it work in those situations?

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Kansei240sx
Posts: 1356
Joined: Mon Nov 01, 2004 10:17 am
Car: S13 - RB25 Circuit car
71 240z - street/track day car
AE86 - Daily Drizzle/track day car
Z31t - Paper weight/street car
Contact:

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I couldnt tell you if the car goes into gear or not. But i do know that it goes into the third, neutral, fourth, and second gear without a problem, and feels stiff and perfectly fine like it used to, same goes for reverse if i move the car a tad, and it wont go into first though. My clutch is dead as sh1t though and the slave is shot.


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