welded diff question.. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SLEEPERracer · 05-06-2007, 02:31 AM

just installed my welded diff and it makes a noise everytime i accelerate. like a contiuous noise. sounds like an airplane about to take off. i put 2 bottles of gear oil, was it enough?? ive driven in other 240s with welded but never had made a sound like this...HELP! lmk, thanks

DoriftoPnoy · 05-06-2007, 02:52 AM

whoa cool i want my car to sound like an airplane is about to take off. prolly scare some domestics. but yea i've never heard this problem before. are you sure it's coming from the diff?

SochBAT · 05-06-2007, 02:56 AM

you didnt' measure the backlashing, did you?

breakindrifts · 05-06-2007, 03:01 AM

If it was the same diff going in after being welded there is really no need to measure backlashing.
At least thats been my experience for the 4-5 cars I've installed welded diff in with no problems for years.

What kind of gear fluid did you put in? Not that it should matter.
Did you put in all the spacer/washer things in correctly?

SLEEPERracer · 05-06-2007, 03:29 AM

well the diff i got came from another 240. but everything fit up correctly. and put everything back from how it was on the other diff. its a white bottle of gear oil forget what brand cause i thru the bottle away. i think the gear oil tho was valvoline 80w-90.

stil need help..kinda irritating me.

street240 · 05-06-2007, 04:10 AM

[quote=breakindrifts;1363775]If it was the same diff going in after being welded there is really no need to measure backlashing.
At least thats been my experience for the 4-5 cars I've installed welded diff in with no problems for years.quote]

I was reading the weldloc buy thread and it says that you still have to or it will make noise and not be good.

SLEEPERracer · 05-06-2007, 03:11 PM

[QUOTE=street240;1363824]

Quote:

Originally Posted by breakindrifts

If it was the same diff going in after being welded there is really no need to measure backlashing.
At least thats been my experience for the 4-5 cars I've installed welded diff in with no problems for years.quote]

I was reading the weldloc buy thread and it says that you still have to or it will make noise and not be good.

well what do i do to measure backlashing and how do i fix it??

gameeffect · 05-06-2007, 03:15 PM

its making noise because the bearings are probably shot...i weld diffs all day for friends and none of the diffs make noise...unless it made noise before you weld it. bottom line...the bearings on that diff are shot, get a new diff and weld that one or weld ur old quiet one and it will be prefect. trust me!

BSPerformance · 05-06-2007, 04:10 PM

like it meakes a wierd whistle everytime u get on the gas? My welded diff never did that on my old 240, then sold it to my friend, and now that I drive his it makes that noise

gotta240 · 05-06-2007, 04:37 PM

too tight of spacing or bad bearings...

Either way=too much friction=dangerous seized diff.

jmo

petex · 05-06-2007, 04:40 PM

this usually happens after you clean diff with degreaser of some sort and weld.

you should leave the oil inthere, because the oil will center bearings/gears (thin film of oil will act as shim if it's easier to imagine) an if you drain it, your diff will be locked off center and will make noice. you dont need to degrease, because the welding should penetrate oil easily.

same thing happend to my friend, he had his diff welded by firstimer, he completly degreased the grears/berings. you dont need to disassemble anything, just take off the cover and start welding.

drifts135 · 05-06-2007, 05:13 PM

It's also common if you have a tiny piece of the wire left in there after welding. Here of this problem commonly where someone just does a poor or sloppy weld and a tiny little particle breaks and will make a "whirling" sound. I've welded a few of these myself too. But as stated above, it could be due to bad bearings, but you would also probably notice that while driving the car before welding it (if this diff that was welded was the same as the one that was in your car before welding).

blu808 · 05-06-2007, 05:23 PM

Bearings would cause this. Also if any welding slag was left in there it will tear up the bearings.

Be carefull because the diff can lock up on you.

gotta240 · 05-06-2007, 05:45 PM

anyone else agree with the "no need to degrease" statement...

I've always been told to degrease, wire brush, then weld...

opinions?

sleepy_s13 · 05-06-2007, 05:58 PM

my diff was welded it never made noise. my friend also had a welded and his diff made the noise your talking about it work fine for a while then he busted a bearing.

spitfire7 · 05-06-2007, 07:06 PM

is a welded diff cool for everyday driving. ive never been in one that had it welded. how hard is it to make a u turn. i hate this one tire fire crap. sorry for starting my own thread. i think there isnt enough fluid in the diff. dont u have to pour it in untill it starts to overflow out of the fill plug.

sblack13 · 05-06-2007, 11:34 PM

bad wheel bearings make sounds similar to airplane noises.

SLEEPERracer · 05-07-2007, 01:57 AM

damn that means i need to get another welded diff...uhhh...was a b!tch taken that off.

!Zar! · 05-07-2007, 02:32 AM

Sounds like you need to set the backlash. If you had no problem with the diff when you pulled it, and now you're having troubles. That is a backlash issue. Unless you have tons of rabbit pellets spinning around in there.

That's extremely dangerous if that is the case.

SLEEPERracer · 05-07-2007, 02:42 AM

well the one i pulled out isnt the same one i had putting it back in. i bought it welded already. well anyway i did clean it with wd-40 before goin in but it was welded already wen i cleaned it. any other ideas?? if it is backlashin what do i do??

!Zar! · 05-07-2007, 02:47 AM

Adjust the mesh between the ring and pinion gear. By shimming the pinion with shims. Only way to know how many and the thickness is to have dye and a feeler guage.

05-06-2007, 02:31 AM	#1
SLEEPERracer Leaky Injector Join Date: May 2005 Location: An Island Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	welded diff question.. just installed my welded diff and it makes a noise everytime i accelerate. like a contiuous noise. sounds like an airplane about to take off. i put 2 bottles of gear oil, was it enough?? ive driven in other 240s with welded but never had made a sound like this...HELP! lmk, thanks

05-06-2007, 02:52 AM	#2
DoriftoPnoy Zilvia Addict Join Date: Apr 2005 Location: SoCal 818 Posts: 715 Trader Rating: (2) Feedback Score: 2 reviews	whoa cool i want my car to sound like an airplane is about to take off. prolly scare some domestics. but yea i've never heard this problem before. are you sure it's coming from the diff? __________________

05-06-2007, 03:01 AM	#4
breakindrifts Zilvia FREAK! Join Date: Apr 2005 Location: Agoura Hills, CA Age: 36 Posts: 1,006 Trader Rating: (0) Feedback Score: 0 reviews	If it was the same diff going in after being welded there is really no need to measure backlashing. At least thats been my experience for the 4-5 cars I've installed welded diff in with no problems for years. What kind of gear fluid did you put in? Not that it should matter. Did you put in all the spacer/washer things in correctly? __________________ [

05-06-2007, 04:10 AM	#6
street240 Zilvia Junkie Join Date: Jan 2007 Location: Rapid Posts: 502 Trader Rating: (0) Feedback Score: 0 reviews	[quote=breakindrifts;1363775]If it was the same diff going in after being welded there is really no need to measure backlashing. At least thats been my experience for the 4-5 cars I've installed welded diff in with no problems for years.quote] I was reading the weldloc buy thread and it says that you still have to or it will make noise and not be good. __________________ The Gallo 24 would be a better motor for my skyline...But I am waiting on the swap dvd...

05-06-2007, 03:15 PM	#8
gameeffect Zilvia Member Join Date: Oct 2004 Location: san jose, ca Posts: 244 Trader Rating: (0) Feedback Score: 0 reviews	its making noise because the bearings are probably shot...i weld diffs all day for friends and none of the diffs make noise...unless it made noise before you weld it. bottom line...the bearings on that diff are shot, get a new diff and weld that one or weld ur old quiet one and it will be prefect. trust me! __________________ Allen

05-06-2007, 02:56 AM	#3
SochBAT Post Whore! Join Date: Dec 2004 Location: Abilene, TX Age: 39 Posts: 6,428 Trader Rating: (9) Rides Gallery: SochBAT Feedback Score: 9 reviews	you didnt' measure the backlashing, did you?

05-06-2007, 03:29 AM	#5
SLEEPERracer Leaky Injector Join Date: May 2005 Location: An Island Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	well the diff i got came from another 240. but everything fit up correctly. and put everything back from how it was on the other diff. its a white bottle of gear oil forget what brand cause i thru the bottle away. i think the gear oil tho was valvoline 80w-90. stil need help..kinda irritating me.

05-06-2007, 04:10 PM	#9
BSPerformance Zilvia Addict Join Date: Aug 2004 Location: Philly Age: 35 Posts: 863 Trader Rating: (9) Feedback Score: 9 reviews	like it meakes a wierd whistle everytime u get on the gas? My welded diff never did that on my old 240, then sold it to my friend, and now that I drive his it makes that noise __________________ a silvia

05-06-2007, 04:37 PM	#10
gotta240 Post Whore! Join Date: Dec 2005 Location: so cal Posts: 3,496 Trader Rating: (21) Feedback Score: 21 reviews	too tight of spacing or bad bearings... Either way=too much friction=dangerous seized diff. jmo

05-06-2007, 04:40 PM	#11
petex Join Date: Apr 2007 Location: wine valley Posts: 11 Trader Rating: (0) Feedback Score: 0 reviews	this usually happens after you clean diff with degreaser of some sort and weld. you should leave the oil inthere, because the oil will center bearings/gears (thin film of oil will act as shim if it's easier to imagine) an if you drain it, your diff will be locked off center and will make noice. you dont need to degrease, because the welding should penetrate oil easily. same thing happend to my friend, he had his diff welded by firstimer, he completly degreased the grears/berings. you dont need to disassemble anything, just take off the cover and start welding.

05-06-2007, 05:13 PM	#12
drifts135 Zilvia Addict Join Date: Dec 2004 Location: Baltimore Posts: 741 Trader Rating: (1) Feedback Score: 1 reviews	It's also common if you have a tiny piece of the wire left in there after welding. Here of this problem commonly where someone just does a poor or sloppy weld and a tiny little particle breaks and will make a "whirling" sound. I've welded a few of these myself too. But as stated above, it could be due to bad bearings, but you would also probably notice that while driving the car before welding it (if this diff that was welded was the same as the one that was in your car before welding).

05-06-2007, 05:23 PM	#13
blu808 Post Whore! Join Date: Dec 2002 Location: Campbell, Ca Age: 42 Posts: 5,010 Trader Rating: (3) Feedback Score: 3 reviews	Bearings would cause this. Also if any welding slag was left in there it will tear up the bearings. Be carefull because the diff can lock up on you. __________________

05-06-2007, 05:45 PM	#14
gotta240 Post Whore! Join Date: Dec 2005 Location: so cal Posts: 3,496 Trader Rating: (21) Feedback Score: 21 reviews	anyone else agree with the "no need to degrease" statement... I've always been told to degrease, wire brush, then weld... opinions?

05-06-2007, 05:58 PM	#15
sleepy_s13 Zilvia Junkie Join Date: May 2006 Location: West Covina Age: 38 Posts: 569 Trader Rating: (1) Feedback Score: 1 reviews	my diff was welded it never made noise. my friend also had a welded and his diff made the noise your talking about it work fine for a while then he busted a bearing. __________________ $K:\pics\Cars\new sig bridge copy.jpg$

05-06-2007, 07:06 PM	#16
spitfire7 Zilvia Junkie Join Date: Nov 2005 Location: 213 Posts: 390 Trader Rating: (1) Feedback Score: 1 reviews	is a welded diff cool for everyday driving. ive never been in one that had it welded. how hard is it to make a u turn. i hate this one tire fire crap. sorry for starting my own thread. i think there isnt enough fluid in the diff. dont u have to pour it in untill it starts to overflow out of the fill plug.

05-06-2007, 11:34 PM	#17
sblack13 Zilvia FREAK! Join Date: May 2005 Location: Seattle Age: 38 Posts: 1,016 Trader Rating: (10) Feedback Score: 10 reviews	bad wheel bearings make sounds similar to airplane noises.

05-07-2007, 01:57 AM	#18
SLEEPERracer Leaky Injector Join Date: May 2005 Location: An Island Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	damn that means i need to get another welded diff...uhhh...was a b!tch taken that off.

05-07-2007, 02:32 AM	#19
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	Sounds like you need to set the backlash. If you had no problem with the diff when you pulled it, and now you're having troubles. That is a backlash issue. Unless you have tons of rabbit pellets spinning around in there. That's extremely dangerous if that is the case. __________________

05-07-2007, 02:42 AM	#20
SLEEPERracer Leaky Injector Join Date: May 2005 Location: An Island Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	well the one i pulled out isnt the same one i had putting it back in. i bought it welded already. well anyway i did clean it with wd-40 before goin in but it was welded already wen i cleaned it. any other ideas?? if it is backlashin what do i do??

05-07-2007, 02:47 AM	#21
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	Adjust the mesh between the ring and pinion gear. By shimming the pinion with shims. Only way to know how many and the thickness is to have dye and a feeler guage. __________________