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enfield_dinosaur

Member Since: 14 Jun 2015
Location: Tertius orbis
Posts: 120

2007 Defender 110 Puma 2.4 SW Java Black

Vietnam war helicopter noises (?) when starting from cold

Hi folks!

Yes, the title is weird, but that's the way it sounds. When cold and having remained outside for the night, the next morning my Defender sounds very strange. When driving slow, some part sounds similar to a heavy military helicopter from the Vietnam war. A very deep, heavy "bubbabubbabubba". It gets better when driving around for a bit, apparently it's connected to some part warming up. However, it never completely vanishes.

It also apparently does not come from the engine. While the frequency of the strange sound increases if I turn up the revs, the Diesel engine sounds as it should. I had someone from a workshop listen to it, but the car was warm, and the problem did not manifest.

Anyone ever experienced this? What should I check out? (just had the EGR changed, again)

Am grateful for any tips -

5th Apr 2016 5:45pm

Rosco

Member Since: 03 Dec 2010
Location: Burntwood
Posts: 1833

2015 Defender 110 Puma 2.2 XS CSW Montalcino Red

I get this from time to time an assume it's the viscous fan engaging. Why it engages when cold alludes me 2007 - Stornoway Grey 90 XS SW - Gone
2002 - Black Discovery II - Gone
2014 - Montalcino Red 110 XS SW

5th Apr 2016 6:08pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20444

Ancillary drive belt slipping? That may be it.

5th Apr 2016 6:11pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

my td5 defender and tdv6 disco both make a sound like you describe. I think it's the viscous fan and comes from parking it up with the fan engaged.

I can recreate it by removing and refitting the fan as the 1st start up it is engaged and makes the funny sound for a short while.

I think spinning g the fan by hand also engages it as I had it happen after inspecting the fan blades after pulling a stick out from green laning 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

5th Apr 2016 8:33pm

Alien

Member Since: 18 Jan 2015
Location: Bacchus Marsh
Posts: 230

http://daviescraig.com.au/faq#faq-6

Cheers,
Kyle.

6th Apr 2016 1:40am

Alien

Member Since: 18 Jan 2015
Location: Bacchus Marsh
Posts: 230

From the above link...
"My fan clutch makes a loud noise when started cold. Is this normal?"
Yes, most fan clutches allow the fluid to drain into the working area when shut down and engage the clutch. At starts it may take 1-2 minutes for the clutch to slow down.

Stupid phone would not let me edit the first post, grrr.
Moved my post count along though. Cheers,
Kyle.

6th Apr 2016 1:44am

enfield_dinosaur

Member Since: 14 Jun 2015
Location: Tertius orbis
Posts: 120

Thanks for all the answers! I thought I was the only one with this phenomenon, but with Defenders, even the strange noises seem to be common

Will check the viscous fan when I go out the parking lot in a few minutes...

Thanks!

6th Apr 2016 7:57am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17443

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

I usually don't worry until I hear the door gunners open up with the M60s.

6th Apr 2016 8:24am

Rosco

Member Since: 03 Dec 2010
Location: Burntwood
Posts: 1833

Its hearing Ride of the Valkyries that concerns me

https://youtu.be/nCU0_QHUO-M

(I'd embed it properly but technology seems to evade sometimes

) 2007 - Stornoway Grey 90 XS SW - Gone
2002 - Black Discovery II - Gone
2014 - Montalcino Red 110 XS SW

6th Apr 2016 1:06pm

enfield_dinosaur

Member Since: 14 Jun 2015
Location: Tertius orbis
Posts: 120

It's solved!

The copper seal on one of the injectors was getting loose, and the injector started to bounce around. Glad we caught the

in time!

25th Apr 2016 11:33am

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