sr20 tranny problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mytagsucks · 06-22-2010, 01:26 AM

Looked in alot of fourms and places on the internet but I'd love the opinion of so zilvians on this one. For the first week of driving my sr after I had it rebuilt the transmission shifted buttery smooth but it gradually has become harder and harder to shift. It started with a grind while going into reverse. Really bad grind but it was NEVER there before and i never mis-shifted or anything. Now getting into first makes my shoulder want to fall off and I'm a pretty muscular guy. While rolling i can get it into first easy though.

Now while I'm in first, the car rolls with decent speed even when i have the clutch pedal to the floor. And in order to stop i have to keep my foot on the brake but when I do so the rpm's seem to drop quite a bit.

Shifting into the rest of the gears is easy but still not smooth like it once was. slight grind into fifth about half the time too. Now is this a clutch problem or a tranny problem? New slave cylinder? I'm sure my syncros are shit by now because of this abuse but the cars my daily and i'm strapped on cash but, other than that could it be some clutch adjustment problem, possibly need a new clutch? I just don't see how it went from running great to complete shit in such short time.....

Slidin' Sam · 06-22-2010, 01:50 AM

Something clutch related. Something was not installed properly or is out of spec. FYI, SR transmissions are garbage.

DJPimpFlex · 06-22-2010, 01:56 AM

Sounds like your clutch isn't disengaging properly. You probably drove it like that a bit then wore out your transmission. Just a guess though. How does your clutch feel hydraulically, like does the pedal return all the way out?

mytagsucks · 06-22-2010, 09:29 AM

Quote:

Originally Posted by DJPimpFlex

Sounds like your clutch isn't disengaging properly. You probably drove it like that a bit then wore out your transmission. Just a guess though. How does your clutch feel hydraulically, like does the pedal return all the way out?

Yea it returns absolutely fine. Really no difference, maybe slightly softer but I honestly have not noticed.

I'm thinking to go pick up a new clutch and tranny?

besTint · 06-22-2010, 04:11 PM

air in the clutch line? or even a leak.

Slidin' Sam · 06-22-2010, 04:26 PM

If you are leaking gear oil or burnging it up in your transmission (or just have low gear oil) it can cause some of these problems also because the syncro's are not getting properly lubricated.

*fliprayzin240sx* · 06-22-2010, 04:33 PM

Rule #1: DO NOT USE GL-5 OIL IN SR/KA TRANNIES!!! Only use GL-4 oil...

Rule #2: Get rid of the clutch dampner line, makes bleeding your clutch line a breeze...

Where is your clutch engaging/disengaging? Sounds like its doing it almost to the bottom...start by adjusting the clutch pedal engagement point higher....

mytagsucks · 06-22-2010, 11:13 PM

Quote:

Originally Posted by fliprayzin240sx

Rule #1: DO NOT USE GL-5 OIL IN SR/KA TRANNIES!!! Only use GL-4 oil...

Rule #2: Get rid of the clutch dampner line, makes bleeding your clutch line a breeze...

Where is your clutch engaging/disengaging? Sounds like its doing it almost to the bottom...start by adjusting the clutch pedal engagement point higher....

Explain the whole GL-4 to me. Ive just got a standard 75w-90 in there nothing special. But the clutch has seemed to engage alot lower than it once did now that I think of it. maybe just about less than halfway...

*fliprayzin240sx* · 06-23-2010, 01:37 AM

GL-5 oils have something in them that doesnt bode well with the brass synchros in SR/KA trannies. Its fine as long as the gear oil temp doesnt exceed a certain temp, but when it gets too hot, the oil reacts with the brass and over time, eats it.

codyace · 06-23-2010, 09:33 PM

Quote:

Originally Posted by fliprayzin240sx

GL-5 oils have something in them that doesnt bode well with the brass synchros in SR/KA trannies. Its fine as long as the gear oil temp doesnt exceed a certain temp, but when it gets too hot, the oil reacts with the brass and over time, eats it.

GL5 or Synthetics?

I've been running Rotella 80/90 gear oil forever, and haven't really had any issues....not saying you are wrong, but I'm very interested to know!

Edit: Yea the FSM says Gl4...how on earth have I missed this forever!

Edit 2: Seems as if GL4 would be best in a stock application, while Gl5 is better for a higher power/temp situation? Both are designed for manual hypoid transmissions, and both are 'equally' as slippery...seems as if so long as you stay away from synthetic, you'll be ok.

I'll read more tomorrow, as now i"m interested....can't beleive in all this time I didn't see the Gl4, but it seems like Gl5 is ok still...

mytagsucks · 06-23-2010, 05:54 PM

I just ordered a new clutch, I'll put it in along with a resurfaced flywheel and I'll see how it runs.

mytagsucks · 06-24-2010, 11:32 AM

ok so just wanted to clean the garage, and went to back out the car today. starts fine but once in first or reverse the car dies with the clutch pedal to the floor. The clutch definately is shot

06-22-2010, 01:56 AM	#3
DJPimpFlex Post Whore! Join Date: Jan 2004 Location: Rohnert Park, CA Age: 39 Posts: 6,158 Trader Rating: (115) Rides Gallery: DJPimpFlex Feedback Score: 115 reviews	Sounds like your clutch isn't disengaging properly. You probably drove it like that a bit then wore out your transmission. Just a guess though. How does your clutch feel hydraulically, like does the pedal return all the way out? __________________

06-22-2010, 04:11 PM	#5
besTint Post Whore! Join Date: Mar 2008 Location: Stanton, CA Posts: 2,641 Trader Rating: (81) Rides Gallery: besTint Feedback Score: 81 reviews	air in the clutch line? or even a leak. __________________ http://squarespokes.com/

06-22-2010, 04:26 PM	#6
Slidin' Sam Zilvia Addict Join Date: Jul 2009 Location: Japan Posts: 729 Trader Rating: (9) Feedback Score: 9 reviews	If you are leaking gear oil or burnging it up in your transmission (or just have low gear oil) it can cause some of these problems also because the syncro's are not getting properly lubricated. __________________

06-22-2010, 04:33 PM	#7
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Rule #1: DO NOT USE GL-5 OIL IN SR/KA TRANNIES!!! Only use GL-4 oil... Rule #2: Get rid of the clutch dampner line, makes bleeding your clutch line a breeze... Where is your clutch engaging/disengaging? Sounds like its doing it almost to the bottom...start by adjusting the clutch pedal engagement point higher.... __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

06-23-2010, 01:37 AM	#9
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	GL-5 oils have something in them that doesnt bode well with the brass synchros in SR/KA trannies. Its fine as long as the gear oil temp doesnt exceed a certain temp, but when it gets too hot, the oil reacts with the brass and over time, eats it. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

06-22-2010, 01:26 AM	#1
mytagsucks Leaky Injector Join Date: Jul 2009 Location: Chicago Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	sr20 tranny problem Looked in alot of fourms and places on the internet but I'd love the opinion of so zilvians on this one. For the first week of driving my sr after I had it rebuilt the transmission shifted buttery smooth but it gradually has become harder and harder to shift. It started with a grind while going into reverse. Really bad grind but it was NEVER there before and i never mis-shifted or anything. Now getting into first makes my shoulder want to fall off and I'm a pretty muscular guy. While rolling i can get it into first easy though. Now while I'm in first, the car rolls with decent speed even when i have the clutch pedal to the floor. And in order to stop i have to keep my foot on the brake but when I do so the rpm's seem to drop quite a bit. Shifting into the rest of the gears is easy but still not smooth like it once was. slight grind into fifth about half the time too. Now is this a clutch problem or a tranny problem? New slave cylinder? I'm sure my syncros are shit by now because of this abuse but the cars my daily and i'm strapped on cash but, other than that could it be some clutch adjustment problem, possibly need a new clutch? I just don't see how it went from running great to complete shit in such short time.....

06-22-2010, 01:50 AM	#2
Slidin' Sam Zilvia Addict Join Date: Jul 2009 Location: Japan Posts: 729 Trader Rating: (9) Feedback Score: 9 reviews	Something clutch related. Something was not installed properly or is out of spec. FYI, SR transmissions are garbage. __________________

06-23-2010, 05:54 PM	#11
mytagsucks Leaky Injector Join Date: Jul 2009 Location: Chicago Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	I just ordered a new clutch, I'll put it in along with a resurfaced flywheel and I'll see how it runs.

06-24-2010, 11:32 AM	#12
mytagsucks Leaky Injector Join Date: Jul 2009 Location: Chicago Posts: 135 Trader Rating: (3) Feedback Score: 3 reviews	ok so just wanted to clean the garage, and went to back out the car today. starts fine but once in first or reverse the car dies with the clutch pedal to the floor. The clutch definately is shot