 » Site Navigation | | | | » Recent Threads | | | |  |  |  | |  04-16-2006, 02:20 PM | #1 | | Junior Member Join Date: Apr 2006 Posts: 6 |  Noisy diff maybe not sure
I recently got my wife a 95 318Ti auto. There is a high pitched sound coming from the rear. Becomes noticable from about 50kph onwards but does'nt seem to get louder with speed increase or going round corners. The sound is remenecent to a Cicada (an insect here in New zealand that makes a high pitched noise on hot summer days). It's not overbearing but noticeable. (Can be clearly heard with the window open and passing other cars or when driving close to sidewalks. Has anybody experienced this? |  |  | | 04-16-2006, 02:53 PM | #2 | | Senior Member Join Date: Jun 2003 Location: Greenville, SC Posts: 9,356 |
Is this an open diff?
I kinda doubt that the diff is going.
You can always drain the fluid and feel for metal fillings.
My money is on wheel bearings.
Wheel bearings are generally high pitch.
When my diff went is was more of a low moaning sound. __________________ ...steven
BMW CCA #146825
1996 BMW 328ti • 2003 MINI Cooper S • 2016 M235i
www.bmwcca.org
| | | | | 04-16-2006, 03:06 PM | #3 | | Junior Member Join Date: Apr 2006 Posts: 6 | bearings?
maybe but these don't get louder as you change direction or put load on them and also don't seem to change much as the speed increases | | | | | 04-16-2006, 03:18 PM | #4 | | Senior Member Join Date: Jun 2003 Location: Greenville, SC Posts: 9,356 |
OK. Make sure you have all your lifting pads in place.
Know you, those hockey puck looking things. __________________ ...steven
BMW CCA #146825
1996 BMW 328ti • 2003 MINI Cooper S • 2016 M235i
www.bmwcca.org
| | | | | 04-16-2006, 03:48 PM | #5 | | Junior Member Join Date: Apr 2006 Posts: 6 | no idea
only had the car for 2 weeks, so i don't know them at all | | | | | 04-16-2006, 03:49 PM | #6 | | Junior Member Join Date: Apr 2006 Posts: 6 | what do the lifting pads do?
where are they situated? | | | | | 04-16-2006, 05:24 PM | #7 | | Senior Member Join Date: Jun 2003 Location: Greenville, SC Posts: 9,356 |
Quote: | Originally Posted by hisbikes where are they situated? | Look at http://www.pelicanparts.com/BMW/tech...Jacking_Up.htm The pad is fig 4. You should have 4 of them. __________________ ...steven
BMW CCA #146825
1996 BMW 328ti • 2003 MINI Cooper S • 2016 M235i
www.bmwcca.org
| | | | | 04-16-2006, 06:33 PM | #8 | | Junior Member Join Date: Dec 2004 Location: CA Posts: 22 | Same with my car
95 318ti with auto tranny
I will be interested to hear what you come up with. Same thing with my car, after about 20 mph I hear it constant sound no change with speed with the windows down, I checked my diff fluid and it was full and clean, serviced it and I thought it reduced the noise some but it could be one of those "car runs better when its clean" things.
I did find one of the disk guards, rear RH, was bent making light contact with the rotor and that quieted it down a bit but the sound is still there.
I sort of gave up on finding it figuring it might be my transmission, friction plates (automatic) since the previous owner never serviced it and when I did the fluid was very black, coupled with the fact that it slips a bit at certain times. | | | | | 04-17-2006, 08:11 AM | #9 | | Junior Member Join Date: Apr 2006 Posts: 6 | #7 LOL I could'nt figure what you were talking about,
but now I'm really confused, forgive my ignorance but what do these little blocks for jacking the vehicle up have to do with the the high pitched whine coming from the rear? | | | | | 04-17-2006, 08:38 AM | #10 | | Senior Member Join Date: May 2005 Location: England, UK Posts: 1,288 |
jack it up to take a look ? __________________
1995 BMW 316i Cosmos Black
Mods: • Magnex Cat-Back Exhaust • Smoked Corner Lights + Repeators • M3 17" Wheels • De-Baffled Air Box • AC HandBrake Handle and Gear Knob • DEPO Euro Epsiloids + Predator Chronium Rings • Chrome Interior bits •IE Poly-Urethane RSFMs • Kenwood Power Series Audio • Powder Coated e36 325 Front Callipers • Sports Seats | | | | | 04-17-2006, 09:12 AM | #11 | | Junior Member Join Date: Apr 2006 Posts: 6 | Yeah I know what they there for, I thought
that he was talking about some type of block thats at the diff that may be missing or something like that. | | | | | 04-17-2006, 12:35 PM | #12 | | Moderator Join Date: Jun 2003 Location: Bouncing off the rev limiter in CT! Posts: 3,156 |
If the puck is missing the air can 'whistle' across the open hole at certain speeds....  | | | | | 04-17-2006, 02:17 PM | #13 | | Senior Member Join Date: May 2005 Location: England, UK Posts: 1,288 |
pretty sure mine was not a hig high pitch sound when mine went.... but it was jsut a steady rumble i believe. i can't remember and it was only a month or 2 ago! __________________
1995 BMW 316i Cosmos Black
Mods: • Magnex Cat-Back Exhaust • Smoked Corner Lights + Repeators • M3 17" Wheels • De-Baffled Air Box • AC HandBrake Handle and Gear Knob • DEPO Euro Epsiloids + Predator Chronium Rings • Chrome Interior bits •IE Poly-Urethane RSFMs • Kenwood Power Series Audio • Powder Coated e36 325 Front Callipers • Sports Seats | | | | | 04-17-2006, 03:50 PM | #14 | | aka Stabby Join Date: Nov 2004 Location: Mead, CO Posts: 5,336 |
ring/pinion are more high-pitched, but it changes pitch with speed and load so it doesn't sound like what you have. maybe an air leak somewhere? __________________ 1996 318ti, California package, 267k miles
current mods: bilstein sports, bavauto springs, e30 m3 LCABs, solid metal ball joints, bavauto RSMs w/reinforcements, e30 3.73 LSD & halfshafts, supersprint cat-back exhaust, turner rear sway bar reinforcements, IE poly subframe & RTABs + camber/toe kits, powdercoated e36 32x front calipers, sport mirrors, H&R 28mmF/19mmR sway bars, x-brace, auto solutions SSK w/poly bushing upgrade, BMW CD43 head unit, DICE HD Radio w/iPod integration and "stealth" HD antenna, staggered style 68s, orange electronic TPMS, leather arm rest, JT Designs metal undertray
acquired and awaiting install: heated seat kit, cali top switch relo, lumbar support kit, park distance control kit, heated washer nozzle kit, m-coupe rear subframe, trailing arms, differential, and halfshafts, m-coupe front/rear brakes with master cylinder, under hood light kit, mud flaps, rear sun blind, auto-dimming rear view mirror, tilt steering wheel retrofit, apexcone 5000K HIDs with 55W ballasts
2002 X5 4.4 Sport Package, 53.5k miles
Current Mods: e46 m3 steering wheel | | | | | 04-17-2006, 04:03 PM | #15 | | Senior Member Join Date: May 2005 Location: England, UK Posts: 1,288 |
ah! remove the rear bench and drive with it out for a while. When my diff was shot i had the rear bench out for some other reason and it was rather loud i recall. either way it might help to isolate where the sound os coming from. get a mate to listen while u drive... __________________
1995 BMW 316i Cosmos Black
Mods: • Magnex Cat-Back Exhaust • Smoked Corner Lights + Repeators • M3 17" Wheels • De-Baffled Air Box • AC HandBrake Handle and Gear Knob • DEPO Euro Epsiloids + Predator Chronium Rings • Chrome Interior bits •IE Poly-Urethane RSFMs • Kenwood Power Series Audio • Powder Coated e36 325 Front Callipers • Sports Seats | | | | | |
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