thegreatestben Posted February 6, 2016 Share Posted February 6, 2016 Hey not os but I believe the trans in my e46 316ti is the same as e30's and stuff. Manual getrag 5 speed. Everything works great shifts well etc. Problem its having though is in each gear there is a certain rev range on deceleration where a very noticeable grumble/whine comes from under the car. It sounds like front of the gearbox but the position of the box under the car vs the driver position its hard to say. The most noticeable time is decelerating in 5th any speed over 92kmh. Any application of throttle or going below that speed the noise goes away completely. It will do it in 4th 3rd and 2nd too but in more specific speed vs rev ranges. Not a peep during standard day to day driving. I am thinking input shaft bearing but not so certain. I jumped underneath and made sure its not mounts or driveshaft touching under movement. These cars have a foil heatshield and it appears that had been touching a bit at the diff end of ds but not the cause of my house. Help Quote Link to comment Share on other sites More sharing options...
tim13 Posted February 6, 2016 Share Posted February 6, 2016 are these dual mass flywheels ? e36's were , can give some odd issues ...... you checked the driveshaft couplings ? those rubber donuts can break up quite spectacularly and still drive ok Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 6, 2016 Author Share Posted February 6, 2016 Yeah externally everything appears in order. The guibo or rubber donut is fine. I don't think these are subject to much stress in the 316. After another drive today I have a suspicion it could be due to engine twisting over under decel causing the motor to touch something ever so slightly. The engine is half under the firewall so plenty of chances to nip something. Quote Link to comment Share on other sites More sharing options...
johnnyfive Posted February 7, 2016 Share Posted February 7, 2016 Could you load it up in reverse on the spot and get a helper to look underneath the bonnet? Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 7, 2016 Author Share Posted February 7, 2016 Yeah I've had that thought, we also have b train length lifters at work. Just tried removing engine cover as it was apparent it had been touching but no dice. Quote Link to comment Share on other sites More sharing options...
tim13 Posted February 7, 2016 Share Posted February 7, 2016 have seen the odd broken engine bearer (alloy bit between engine and mount) on these , was not as obvious as you would expect to look at ....... am wildly stabbing in the dark with these guesses , sooooo many things that fall off mid 90's on beemers 1 Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 7, 2016 Author Share Posted February 7, 2016 Ha yeah this seems pretty decent, German built. I gave the engine mounts a test with a bar and they seem ok. They flex but return to rest nicely. I might have another look at work on the lifters Quote Link to comment Share on other sites More sharing options...
cletus Posted February 7, 2016 Share Posted February 7, 2016 Â guibo this sounds like a derogatory name for an italian, ha 2 Quote Link to comment Share on other sites More sharing options...
Bangbug Posted February 7, 2016 Share Posted February 7, 2016 Nobody has ripped on you for having a 316ti. Not sure if I'm proud or sickened. I'm sorry I have nothing helpful to add except throw a 2.8 in there Quote Link to comment Share on other sites More sharing options...
Frosty Posted February 9, 2016 Share Posted February 9, 2016 What ever the problem is it relates to isolation of the drive train, so look for worn mounts the full length of the drive train, engine, gearbox and diff. Sound and vibration can be very hard to pin point especially in a modern car with sound proofing it will tend to come from where that is least effective rather than it's actual location. Â Left field thinking might suggest a stone or the like could be trapped above gearbox or diff? Â Another thought is a cracked or bent mounting in anything that is rigidly mounted to the drive train like the exhaust for example. Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 9, 2016 Author Share Posted February 9, 2016 Noted. The interesting thing is that the sound starts and stops like a switch is being flicked it doesn't taper off. I might see how my phone picks up the noise and if ok ill post a vid. Quote Link to comment Share on other sites More sharing options...
japawagons Posted February 10, 2016 Share Posted February 10, 2016 Input shaft bearings are generally noisest in 1st and get progressively quiet through the gears... In my experience but thats mostly FWD boxes. Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted February 10, 2016 Author Share Posted February 10, 2016 Yeah I thought it odd that it only does it on decel and realistically its not that loud. I can't feel it through the shifter or the floor. I am not unwilling to accept it might not be the gearbox at all Quote Link to comment Share on other sites More sharing options...
Frosty Posted February 10, 2016 Share Posted February 10, 2016 If you can feel it through the gear stick as well as getting worse with torque load it could be tail shaft or lay shaft bearings? Â How long since the gearbox had an oil change? they do need doing every million km's or so. Quote Link to comment Share on other sites More sharing options...
phr34kr Posted February 10, 2016 Share Posted February 10, 2016 my mates one absolutely shat the input shaft bearing on his e36, His was louder in gear and quietened down a lot when the clutch was engaged. Sounded like marbles in a can by the time we changed it over. Quote Link to comment Share on other sites More sharing options...
Mof Posted February 10, 2016 Share Posted February 10, 2016 I vote diff Wiggle the pinion side to side, see if it's got play Quote Link to comment Share on other sites More sharing options...
DB8-TypeR Posted February 16, 2016 Share Posted February 16, 2016 Does the exhaust manifold have a bracket attaching it to the block for support? My car had a hairline crack through this which caused a rattle on decel only. Looked to be fine but when I pulled it of it was actually in two pieces Quote Link to comment Share on other sites More sharing options...
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