Transmission swap...Grinding noise when engine braking??? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

az_240 · 09-22-2007, 02:31 AM

Just did an auto to manual swap. Everytime I let the car engine brake (car in gear foot off the gas) and im in the 2300-2800rpm range I get a kind of grinding sound along with some roughness.... it sounds kind of like the driveshaft being pushed too far into the transmission.

Ive got an ebay lightweight flywheel, RPS 6 puck street clutch, stock driveshaft and poly filled engine mounts o and I used a needle bearing for the pilot bushing.

It also chatter s quite a bit when in reverse or if im turning and trying to engage the clutch. Will the clutch wear in and quit making the noise so apparent?

Anybody else have this prob?

Thx

Sileighty_85 · 09-22-2007, 08:08 AM

I had a similar problem with My AE86 when I had a Tripple-Plate Clutch in it. Turned out I broke 10 of the 13 blots that held the pressure plate to the flywheel. so when I engine braked you could here the bolts rattleing around in the holes.

az_240 · 09-22-2007, 08:58 PM

its not that...
anyone else?

It mostly does it in 4th gear...
it doesnt do it at all in 5th gear....and 1st, 2nd and 3rd do it right around 2300-2600rpm

az_240 · 09-23-2007, 10:51 PM

. Nobody
?

Disturbe240 · 09-23-2007, 11:09 PM

i have the exact same problem and it looks like its coming from de diff, it could just be missing oil. i hope so

az_240 · 09-24-2007, 03:53 AM

nope not comming from the diff... definitely from the transmission

GSXRJJordan · 09-24-2007, 04:01 AM

I've got a similar noise, but I know for sure it's my 2way diff. Pulling the tranny back off to look for broken/backed off bolts would be the first step. Making sure it's got the correct amount of the correct tranny fluid is the second step.

If you've got a non-abs car, and you put in a non-abs driveshaft (that's important) from the correct generation, it's not the driveshaft. It can't be pushed "too far in" to the transmission, and how could it move, anyway? Its bolted to the diff, which doesn't move.

The noise you're hearing is either an incorrectly installed clutch, loose bolts rattling the pressure plate, or just a noisy 6 puck clutch. The shaking/uneven engagement in reverse/etc is just an aggressive clutch. It'll get a little better over time, but that's the price to pay for having a 6puck with an aggressive pressure plate.

DJ_Sunrise · 09-24-2007, 04:14 PM

Do you have access to a lift? My car seems to make a grinding noise as well.. But it's actually my exhaust vibrating and hiting the rear sway bar. CS exhaust hanger bushings tuck the exhaust in close. Also, I in any case where metal is concerned.. the vibration could come from anywhere. I replaced my drive shaft and trans only to figure out later that my rear had too much play. Just take your car to Nissan and save yourself money/headache. Let an experienced tech handle it.

-Bart

Nikeboy355 · 09-24-2007, 05:00 PM

I've got the same noise... My noise is coming from the transmission for sure...

I put the car on jackstands yesterday and turned the car on (out of gear) and it made the noise on startup... Does yours do that?...

Tonight I'm going to pull the tranny out again (third time in two weeks) and see what happened...

azndummie · 09-24-2007, 06:40 PM

its the driveshaft metal collar rubbing against that cover at the end of the transmission where the driveshaft goes in. i dont think it should be that much of a problem

KAredkouki · 09-24-2007, 06:51 PM

i laso have a probably sometimes when i put it in to first it grinds like crazy but some times it doesnt grind at all it has a kaaz 2 way diff, act clutch, any suggestions?

Nikeboy355 · 09-25-2007, 01:32 AM

I pulled my tranny out tonight... The flywheel bolts came loose...

Bolted it all up with some red threadlocker and drives great again...

WERDdabuilder · 09-25-2007, 02:33 AM

i believe my friend had the same problem with his tranny. some bolt came loose or something. took it out and redid it. fixed. the sound it was making sounded as if it was coming from the Diff so he got a new diff..wasnt that. so yeah..might want to check if a bolt came loose.

s13monkey · 09-25-2007, 03:19 AM

it could be that the pressure plate came loose or you have a throttle bearing problem chances are that is you bearing also check the nuts that hold up the master clutch cylinder they may have come loose. hope that helps

az_240 · 09-25-2007, 07:49 AM

I torqued everything down a little tighter than spec... its made this same noise since I first drove it around

I think that its weird it will only make the noise around 2500 rpm....if it falls to around 2000 rpm the sound gets louder and just drops off..... its loudest in 4th.

Ill check the obvious and see if anything came loose.

BTW the window weld filled engine mounts SUCK for daily driving.... im replacing those things as soon as I get money for some Nismo ones

09-22-2007, 02:31 AM	#1
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	Transmission swap...Grinding noise when engine braking??? Just did an auto to manual swap. Everytime I let the car engine brake (car in gear foot off the gas) and im in the 2300-2800rpm range I get a kind of grinding sound along with some roughness.... it sounds kind of like the driveshaft being pushed too far into the transmission. Ive got an ebay lightweight flywheel, RPS 6 puck street clutch, stock driveshaft and poly filled engine mounts o and I used a needle bearing for the pilot bushing. It also chatter s quite a bit when in reverse or if im turning and trying to engage the clutch. Will the clutch wear in and quit making the noise so apparent? Anybody else have this prob? Thx

09-22-2007, 08:08 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	I had a similar problem with My AE86 when I had a Tripple-Plate Clutch in it. Turned out I broke 10 of the 13 blots that held the pressure plate to the flywheel. so when I engine braked you could here the bolts rattleing around in the holes. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

09-22-2007, 08:58 PM	#3
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	its not that... anyone else? It mostly does it in 4th gear... it doesnt do it at all in 5th gear....and 1st, 2nd and 3rd do it right around 2300-2600rpm Last edited by az_240; 09-23-2007 at 04:08 AM..

09-24-2007, 04:01 AM	#7
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	I've got a similar noise, but I know for sure it's my 2way diff. Pulling the tranny back off to look for broken/backed off bolts would be the first step. Making sure it's got the correct amount of the correct tranny fluid is the second step. If you've got a non-abs car, and you put in a non-abs driveshaft (that's important) from the correct generation, it's not the driveshaft. It can't be pushed "too far in" to the transmission, and how could it move, anyway? Its bolted to the diff, which doesn't move. The noise you're hearing is either an incorrectly installed clutch, loose bolts rattling the pressure plate, or just a noisy 6 puck clutch. The shaking/uneven engagement in reverse/etc is just an aggressive clutch. It'll get a little better over time, but that's the price to pay for having a 6puck with an aggressive pressure plate. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

09-24-2007, 05:00 PM	#9
Nikeboy355 Zilvia Addict Join Date: Mar 2004 Location: Los Angeles, CA Age: 45 Posts: 734 Trader Rating: (0) Feedback Score: 0 reviews	I've got the same noise... My noise is coming from the transmission for sure... I put the car on jackstands yesterday and turned the car on (out of gear) and it made the noise on startup... Does yours do that?... Tonight I'm going to pull the tranny out again (third time in two weeks) and see what happened... __________________ http://respectvolkracing.blogspot.com/

09-23-2007, 10:51 PM	#4
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	. Nobody ?

09-23-2007, 11:09 PM	#5
Disturbe240 Join Date: Jan 2007 Location: riki Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	i have the exact same problem and it looks like its coming from de diff, it could just be missing oil. i hope so

09-24-2007, 03:53 AM	#6
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	nope not comming from the diff... definitely from the transmission

09-24-2007, 04:14 PM	#8
DJ_Sunrise Zilvia FREAK! Join Date: Feb 2004 Location: NJ Age: 38 Posts: 1,134 Trader Rating: (1) Feedback Score: 1 reviews	Do you have access to a lift? My car seems to make a grinding noise as well.. But it's actually my exhaust vibrating and hiting the rear sway bar. CS exhaust hanger bushings tuck the exhaust in close. Also, I in any case where metal is concerned.. the vibration could come from anywhere. I replaced my drive shaft and trans only to figure out later that my rear had too much play. Just take your car to Nissan and save yourself money/headache. Let an experienced tech handle it. -Bart

09-24-2007, 06:40 PM	#10
azndummie Zilvia FREAK! Join Date: Dec 2005 Location: orange county Posts: 1,362 Trader Rating: (14) Feedback Score: 14 reviews	its the driveshaft metal collar rubbing against that cover at the end of the transmission where the driveshaft goes in. i dont think it should be that much of a problem

09-24-2007, 06:51 PM	#11
KAredkouki Zilvia Member Join Date: Mar 2007 Location: 626 socal Posts: 272 Trader Rating: (0) Feedback Score: 0 reviews	i laso have a probably sometimes when i put it in to first it grinds like crazy but some times it doesnt grind at all it has a kaaz 2 way diff, act clutch, any suggestions? __________________ Current Car: 97 red Kouki Previous Car: 2000 Silver EJ8 - For Sale

09-25-2007, 01:32 AM	#12
Nikeboy355 Zilvia Addict Join Date: Mar 2004 Location: Los Angeles, CA Age: 45 Posts: 734 Trader Rating: (0) Feedback Score: 0 reviews	I pulled my tranny out tonight... The flywheel bolts came loose... Bolted it all up with some red threadlocker and drives great again... __________________ http://respectvolkracing.blogspot.com/

09-25-2007, 03:19 AM	#14
s13monkey Zilvia Member Join Date: Mar 2006 Location: lynwood Age: 40 Posts: 200 Trader Rating: (0) Feedback Score: 0 reviews	it could be that the pressure plate came loose or you have a throttle bearing problem chances are that is you bearing also check the nuts that hold up the master clutch cylinder they may have come loose. hope that helps __________________

09-25-2007, 07:49 AM	#15
az_240 Post Whore! Join Date: Jan 2006 Location: Phx Posts: 3,097 Trader Rating: (41) Feedback Score: 41 reviews	I torqued everything down a little tighter than spec... its made this same noise since I first drove it around I think that its weird it will only make the noise around 2500 rpm....if it falls to around 2000 rpm the sound gets louder and just drops off..... its loudest in 4th. Ill check the obvious and see if anything came loose. BTW the window weld filled engine mounts SUCK for daily driving.... im replacing those things as soon as I get money for some Nismo ones