Marco Posted September 20, 2010 Share Posted September 20, 2010 Hi, I do have a new (engine) problem. It's engine noise, most noticeable on acceleration and engine braking. Two videos to listen to: I'm searching for leaks, expect e.g. manifold or turbo leak but on stationary / no load I can not spot any leaks. It's 200Tdi engine. Suggestions welcome. Thanks Marco Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 20, 2010 Share Posted September 20, 2010 I cant hear it Youtube and windows volume controls are at Max, and my Amp is at max and its barely audiable. Quote Link to comment Share on other sites More sharing options...
Marco Posted September 20, 2010 Author Share Posted September 20, 2010 I cant hear it Youtube and windows volume controls are at Max, and my Amp is at max and its barely audiable. ..... OK my side too, I do have to switch my amplifier to very loud but can get a decent volume.. It's a bit of a whine, submerged loud purring cat noise, engine revs related. Cheers Marco Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 20, 2010 Share Posted September 20, 2010 adjusted the mixer and wedged my head next to the speaker and had a listen, but all i can make out is lots of drivetrain noise (especially on the overrun) and a diesel engine lol. Quote Link to comment Share on other sites More sharing options...
Marco Posted September 20, 2010 Author Share Posted September 20, 2010 adjusted the mixer and wedged my head next to the speaker and had a listen, but all i can make out is lots of drivetrain noise (especially on the overrun) and a diesel engine lol. Thanks, yes most noticeable on the overrun. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 20, 2010 Share Posted September 20, 2010 can you give some time stamps when its most noticable? For example you lift off the throttle around 19secs and around 22secs on video two, and theres a rythmic whiney "chug chug chug" noise which sounds to me like noisey drivetrain components and lots of backlash? Is this what you mean, or is there something else i'm just not picking up on? Quote Link to comment Share on other sites More sharing options...
Marco Posted September 20, 2010 Author Share Posted September 20, 2010 can you give some time stamps when its most noticable? For example you lift off the throttle around 19secs and around 22secs on video two, and theres a rythmic whiney "chug chug chug" noise which sounds to me like noisey drivetrain components and lots of backlash? Is this what you mean, or is there something else i'm just not picking up on? Here we go, I've made another recording now with sound insulation removed. more noise Best recording starts at around 30 secs, on overrun and keeping phone close to gearbox tunnel. Right now it does sound like a bearing noise to me... still bit of the submerged cat rattle...primary pinion or clutch release maybe? Quote Link to comment Share on other sites More sharing options...
crwoody Posted September 20, 2010 Share Posted September 20, 2010 Sounds like exhaust manifold leaking at one of the cylinder head joints to me. Edit; But then again, on a second listen, there seems to be more going on in there. Quote Link to comment Share on other sites More sharing options...
Marco Posted September 21, 2010 Author Share Posted September 21, 2010 I've replaced manifold gaskets + turbo gaskets, might have been a little leak. But more on the LT77... I now guess it's the LT77 creating the nasty noise. On 1, 2 and 3 you can hear the noise, best on the overrun. In 4th there is no noise at all, silent on acceleration and overrun. Did not try 5th in town. Presume it's the unexpected end of my professionally reconditioned LT77 Cheers Marco Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 21, 2010 Share Posted September 21, 2010 Checked its oil level? How old is it? Quote Link to comment Share on other sites More sharing options...
Disco-Ron Posted September 21, 2010 Share Posted September 21, 2010 That sounds horrible.......... my guess is transfer box output bearings.......... have a lay underneath, and wiggle the output shafts..... do this with the handbrake off, but on a level surface with it in gear!!! Another thought on transfer box, try it in low range, is the noise still there,....??? is it speed or engine revs related... that should tell you lots! Also worth jacking it up one axle at a time and giving the wheels a good spin, could be a diff bearing,..... Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 21, 2010 Share Posted September 21, 2010 the fact it goes away in 4th says gearbox to me. The LT77 has a 1:1 4th gear, which means different parts of the box are being used compared with 1-3. If it was the transfer case it'd be there in all the gears. Quote Link to comment Share on other sites More sharing options...
Marco Posted September 21, 2010 Author Share Posted September 21, 2010 I've been driving on the motor way this afternoon and the same noise in 5th gear, only 4th +/- is silent. At the moment I do consider to take apart my shelved LT77 56A suffix H, used to be fine except nasty spline damage on the main shaft. Just found out I do need special tools to take the box apart.... The recon unit I'm using (with the noise) is from Luton, now at 52.000km. For some reason both reconditioned LT230 and LT77 are causing me problems. (see my post on intermediate shaft leak) Cheers Marco Quote Link to comment Share on other sites More sharing options...
Aragorn Posted September 21, 2010 Share Posted September 21, 2010 Makes sense, i THINK the layshaft in the box is only used on 1-3 and 5, whereas 4th is directly transmitted thru the mainshaft becuase its 1:1. Might be wrong, but thats what seems to ring a bell in me head! Quote Link to comment Share on other sites More sharing options...
Marco Posted September 21, 2010 Author Share Posted September 21, 2010 Makes sense, i THINK the layshaft in the box is only used on 1-3 and 5, whereas 4th is directly transmitted thru the mainshaft becuase its 1:1. Might be wrong, but thats what seems to ring a bell in me head! I feel this is very close to the truth.... next question how to solve it DIY or pull out the wallet Quote Link to comment Share on other sites More sharing options...
soakes94 Posted January 12, 2017 Share Posted January 12, 2017 Just wondering what this turned out to be? I have exactly the same noise on my Defender 90, its a 300TDi with an LT77. Thanks Quote Link to comment Share on other sites More sharing options...
Marco Posted January 13, 2017 Author Share Posted January 13, 2017 Hi, Unfortunately I cannot remember, I swapped the LT77 for a R380 shorty box (Ashcroft) a little later. Very nice mod. Vehicle sold some years back and showed up in the United States last year! Cheers Marco Quote Link to comment Share on other sites More sharing options...
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