1991 240sx with 96'engine and 91 transmission
ive got a rattling coming from my transmission when the clutch is engaged in neutral, when teh clutch is pushed in its stopped. is this a broken pilot bushing?? or does tohe transmission need a rebuild? (the transmission still shifts smoothly with no grinding, clutch is new but still a bit sticky in 1st gear, i think the shop did a ****ty job).
ive also bought a almost-new timing chain assembly and gona install it sometime in the summer, does anyone have any tips on that or know where i can get a service manual? (can't find em anywhere here)
thanks
Transmission question
oh another thing, you know how you the top guide breaks it no longer serves any purpose you remove that , the rattle is gone. so what the **** was it there for in the first place? and if i were to put ina new timing chain assembly, new tensioners and lower/upper chain, would i have to a get a new top guide?
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Thee 240sx Owner
- Posts: 1192
- Joined: Thu Apr 03, 2003 9:58 am
- Car: Canadian 89 240 with LSD/stock no ac/ and 4 motor swaps
- Contact:
12er wrote:pilot bushing is only there to hold the clutch allign tool snugly when installing pressure plate.
where did you assume this from... ever looked at the input shaft on a transmission... theres a tip on it.. and yes it does get replaced when you do your clutch.. it is there to hold the input shaft straight... why do you think when you do an auto to manual swap you have to change out that bushing... because the size is different..
as for your noise your hearing man.. thats definately a Throwout bearing issue.. replace it soon and if your going to do it yourself or have a shop do it.. get the flywheel resurfaced if possible... (about $50 bucks) and get a new clutch (about 120, that comes with everything... ToB, pilot bushing, pressure plate, clutch.. and alignment tool.. and its easy to do it yourself)
thanks a lot man. guess ill have to start raking up the cash again. the thing is the clutch has only been in there for a few months. the first time those ***holes at the shop installed it the clutch was slipping like mad. took it back , they 'fixed' it. the transmission is working fine, until now, it still shifts, but like i said sticky in first, and this crackling. those bastards.. *shakes fist*
anyway thanks again everyone for the information.
anyway thanks again everyone for the information.
Thee 240sx Owner wrote:where did you assume this from... ever looked at the input shaft on a transmission... theres a tip on it.. and yes it does get replaced when you do your clutch.. it is there to hold the input shaft straight... why do you think when you do an auto to manual swap you have to change out that bushing... because the size is different..
as for your noise your hearing man.. thats definately a Throwout bearing issue.. replace it soon and if your going to do it yourself or have a shop do it.. get the flywheel resurfaced if possible... (about $50 bucks) and get a new clutch (about 120, that comes with everything... ToB, pilot bushing, pressure plate, clutch.. and alignment tool.. and its easy to do it yourself)
There is a small tip at the end of the transmission input shaft, but after measuring with a caliper, the tip is not even deep enough to come into contact with the new pilot bushing.Of all the clutch jobs I've done on the KA I worked on, before I pull the pilot bushing out, I always measure its' height and thickness and compare it with the new, and found no contact wear of whatsoever kind.Thus I can conclude that what keeping the input shaft straight is not the pilot bushing, instead, it's the bearings inside the transmission and the surfaces where the bearings are seated.
I'm not making an inference here.Besides, the pilot bushing is made out of brass (very soft metal), how long do you think it will be able to hold an input shaft straight? Considering the heat produced in the clutch area along with all the flying clutch dust andf other contaminants in the area collected by the grease lubing it, not too long.
So, how come the bushing is included in the clutch kit? Whoever the person tearing it down first to figure out what should be in the kit could've thought that it's a wear item, and as usual, everybody else copy after that person's findings.
I'm on my 2nd block, it came off an AT car, W/O pilot bushing, and I just installed it that way (allign clutch disc w/ marker), no problem whatsoever. There is bearing noise from the transmission, but those noise has been there even before a clogged oil sump killed the 1st engine. And the TOB came out fine after inspection.
BTW, interesting info on the AT to MT swap thing, redundant but interesting nonetheless. I've only work on MT cars so far.
On the other hand, a blown TOB will give you a hard time shifting into all gears.
Also, resurfacing a flywheel is a wasted effort unless if the flywheel's unevenness is too far from tolerance or there is rust on the mating surface. The machine used to resurface flywheel also come with their own tolerances, making it impossible to get a 100% straight and evenly thick flywheel. So I'd suggest reconditioning the flywheel by use of roloc discs instead. Several light even passes is all it needs, just to clean it up, and get any heat discoloration off. And then there is the machining operator tolerance factor.A clutch disc is never 100% evenly padded. It's always off by several thousands. Call it manufacturing tolerance.
So, how can you say it's definitely a TOB issue if you're in Orlando, Florida, while he's in Vancouver, BC? Did he send you the TOB? Were you even there tearing apart his car?
Edit: my transmission is still the original transmission off the dealership, abused for 12 years, periodically has it's fluid changed, sticky into first and reverse, but no grinds into or out-of any gears.
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Thee 240sx Owner
- Posts: 1192
- Joined: Thu Apr 03, 2003 9:58 am
- Car: Canadian 89 240 with LSD/stock no ac/ and 4 motor swaps
- Contact:
because 99% of the time.. if the noise only occurs when he depresses the clutch... theres 2 things it can be.. TOB and internal wear and tear in the transmission due to it input shaft spinning in neutral... and btw.. trust me on the whole pilot bushing deal.. 3 motors swaps later and 4 auto to 5spd conversions have proved in my favor...
Thee 240sx Owner wrote:because 99% of the time.. if the noise only occurs when he depresses the clutch... theres 2 things it can be.. TOB and internal wear and tear in the transmission due to it input shaft spinning in neutral... and btw.. trust me on the whole pilot bushing deal.. 3 motors swaps later and 4 auto to 5spd conversions have proved in my favor...
So, just because it's hapening 99% of the time, is it right to assume that it must be the cause before inspecting it?I want to trust you, but since I'm not experiencing it, I find it difficult to do the favor.
I have a 95 Altima, and I am having the same problem. At first I assumed it was the throughout bearing, and all the mechanics I knew said the same thing. However when I had it looked at by a shop, I was told it was the transmission itself, and although it wasn't urgent, I would need a new transmission.
Ok, the manual and auto pilot bearings are completely diffrent. Why would they be if according to your "findings", the input shaft never touches the bearing? And it just so happens the auto pilot bearing fits over the auto input shaft. Hmmm......
And why would you need to replace it if it never comes in contact with the input shaft....hmmm.....
Some pilot bearings come pre-lubed....hmmm....
Anyway, I know this car like the back of my hand. It can be 2 things, bearings in the transmission or TOB. BOTH of which happend to me.
Mameluke, I have 2 extra trannys, too bad you live all the way in Canada.
And why would you need to replace it if it never comes in contact with the input shaft....hmmm.....
Some pilot bearings come pre-lubed....hmmm....
Anyway, I know this car like the back of my hand. It can be 2 things, bearings in the transmission or TOB. BOTH of which happend to me.
Mameluke, I have 2 extra trannys, too bad you live all the way in Canada.