Bumpyride Posted May 16, 2009 Share Posted May 16, 2009 Gents The truck has not been used too much recently, short journeys only. Anyhow, this week have done a 400mile round trip. have got a noise which i think can best be descibed by: 1: noise sounds like a wistling/ blowing or possibly a fan clipping something as it rotates 2: increases in volume + reguarity by depressing the accerlator / speed of engine. first 10-15 degrees of accerlator pedal movement - doesn't result in any noise 3: does not occur at tickover or with no load on the engine. - so only with load on the engine. as soon as the clutch is depressed it goes stops. 4: appears to come from the passenger side of the engine bay. 5: have seen no loss of power. to date have checked the following: pulleys - seem ok no rattle or wobble. viscous fan - no chips on the blade, or contact hwen rotating. head gasket appears ok. Do you think this could be a turbo related problem? - have removed the inlet and the impeller rotates fine - bit oily on the inlet though - is this normal? Have briefly checked for leaks on the pipes - nothing obvious - is any leak usually very noticable? what other checks should i be doing on the turbo? many thanks in advance Quote Link to comment Share on other sites More sharing options...
Bumpyride Posted May 16, 2009 Author Share Posted May 16, 2009 wondered if anybody had any thoughts on this please, have another weekend away planned, which is looking like it maybe now spent under the car!! any help much appreciated cheers once again Quote Link to comment Share on other sites More sharing options...
santalars Posted May 16, 2009 Share Posted May 16, 2009 One of many options may be a leaking manifold seal. Quote Link to comment Share on other sites More sharing options...
Mike Posted May 17, 2009 Share Posted May 17, 2009 You say it disappears with the clutch depressed, are you sure its engine and not transmission, is the noise road speed or engine speed related? Quote Link to comment Share on other sites More sharing options...
Gromit Posted May 18, 2009 Share Posted May 18, 2009 You say it disappears with the clutch depressed, are you sure its engine and not transmission, is the noise road speed or engine speed related? ..and does it happen in all gears? Quote Link to comment Share on other sites More sharing options...
ian_s Posted May 18, 2009 Share Posted May 18, 2009 when the intercooler pipes were leaking on mine, the whistling built up to a level and then kinda stayed constant. i assumed this was due to boost pressure reaching its max. i didnt notice any drop in power either. the problem with tracking down the leaking pipe is it may only leak when under pressure! it took me a few weeks to trace mine. Quote Link to comment Share on other sites More sharing options...
fender1234 Posted May 18, 2009 Share Posted May 18, 2009 i had a problem like this, it turned out to be the tensioner for the cambelt. however i would say a leaking turbo hose is most likely. Quote Link to comment Share on other sites More sharing options...
PaulN Posted May 18, 2009 Share Posted May 18, 2009 I'm with 'Santalars' - Exhaust leak somewhere. I had a noise just like this and there was a phit phit phit leak at one of the branch points. (Not a hole as such). Could see from the soot build up on outside where escaps was between two pipes. Get someone to do the throttle and get under running hand near to trace pipe from front to back of whole system and all around pipes. You'll feel it before you see it. Do it when cold as you only have a few minutes otherwise it'll get to hot and you will get burnt!! Quote Link to comment Share on other sites More sharing options...
bigbeast Posted May 18, 2009 Share Posted May 18, 2009 have got a noise which i think can best be descibed by:1: noise sounds like a wistling/ blowing or possibly a fan clipping something as it rotates 2: increases in volume + reguarity by depressing the accerlator / speed of engine. first 10-15 degrees of accerlator pedal movement - doesn't result in any noise 3: does not occur at tickover or with no load on the engine. - so only with load on the engine. as soon as the clutch is depressed it goes stops. 4: appears to come from the passenger side of the engine bay. 5: have seen no loss of power. although mines a td5 i had a similar problem.. the fan seemed like it was clipping something as it was rotating..and the clicking got worse the faster i travelled and the harder the fan worked, at tickover was very slight..and there was no loss of power...this eventually got worse and was very annoying it turned out the viscous fan unit had gone, there was loads of play in the unit and you could literally see it snaking as it rotated and i figure it was striking the aux belt as it span....a new viscous fan and the problem was solved and has been fine ever since if there is any play in the unit at all i would consider a new fan unit...hope this helps...ben Quote Link to comment Share on other sites More sharing options...
Milemarker Type S Posted May 18, 2009 Share Posted May 18, 2009 Sounds like a leak in the turbo piping or the intlet manifold gasket to me- makes a bloody horrible noise... Quote Link to comment Share on other sites More sharing options...
freeagent Posted May 18, 2009 Share Posted May 18, 2009 You can take the fan off and briefly run the engine without it, that'll ensure it isn't the fan... I'd be inclined to agree with the others, take a close look at your exhaust manifld gasket for sooty marks that might indicate a leak... Quote Link to comment Share on other sites More sharing options...
Bumpyride Posted May 18, 2009 Author Share Posted May 18, 2009 cheers for all the comments gents Been away from the PC so have only just read the replies, In reply to engine or transmission, it happens in all gears, so i think its certainly engine. Ill check the exhaust, turbo inlet and intercooler tomorrow and no doubt come back for some more wisdom cheers again Quote Link to comment Share on other sites More sharing options...
Andrew Chua Posted May 20, 2009 Share Posted May 20, 2009 i had a whistling sound before when my air box was not closed properly. it will be pretty audible when the engine is revved and working hard, but not when idle. Thankfully it's nothing more than just refitting it and it's done. Quote Link to comment Share on other sites More sharing options...
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