Turbo failure or worn head?? - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Turbo failure or worn head??

binkagti

Seasoned Pro

Location: canterbury

Registered: 14 Oct 2006

Posts: 2,411

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Post #1

Hi guys, right i get a puff of blue smoke on start up. Once warm the car is fine, but when accelerating flat out there is no smoke coming from the exhaust but as soon as i come off throttle i get quite a large puff of blue smoke.

Now i know my tappets need doing and am getting the head sent to miles to be over hauled, but he did think it could be the turbo,

trouble is the car runs fine, keeps boost fine, goes like a rocket and no noise from turbo.

What do you think it could be??

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Posted 20th Jan 2011 at 02:35

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allanallen

Seasoned Pro

Location: Buxton

Registered: 01 May 2007

Posts: 1,399

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Post #2

Possibly turbo oil seals weaping a bit. A few friends of mine that run turbos never seam to worry about it to much. If it's getting worse though I'd certainly investigate.

What do you mean by tappets? You on solid lifters?

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Posted 20th Jan 2011 at 02:47

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binkagti

Seasoned Pro

Location: canterbury

Registered: 14 Oct 2006

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Post #3

Just sounds like a sowing machine at the top of the head, so want to investigate this.

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Posted 20th Jan 2011 at 02:53

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fletch

Track Head

Location: The nearest Shell garage

Registered: 12 Jun 2004

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Post #4

Rings or Stem seals?

Posted 20th Jan 2011 at 02:53

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fletch

Track Head

Location: The nearest Shell garage

Registered: 12 Jun 2004

Posts: 12,273

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Post #5

binkagti wrote:

Just sounds like a sowing machine at the top of the head, so want to investigate this.

Usually bent valve(s) on the 6 engine, think Ive only ever known one instance of worn tappet causing a top end tap.

Posted 20th Jan 2011 at 02:54

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james_gti6

Senior User

Location: Goodwick

Registered: 18 Jan 2010

Posts: 528

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Post #6

could be turbo, take of the intake pipe and check for play in the shaft, i know its a long shot but try forte seal conditioner, the stem seals had gone hard in my old saxo and this sorted it by softening them, worth a try for �15

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Posted 20th Jan 2011 at 02:56

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allanallen

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Location: Buxton

Registered: 01 May 2007

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Post #7

fletch wrote:

binkagti wrote:

Just sounds like a sowing machine at the top of the head, so want to investigate this.

Usually bent valve(s) on the 6 engine, think Ive only ever known one instance of worn tappet causing a top end tap.

Or incorrect oil

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Posted 20th Jan 2011 at 02:57

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binkagti

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Location: canterbury

Registered: 14 Oct 2006

Posts: 2,411

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Post #8

Also changing the oil and filter on weekend as apparently worn oil could build up carbon deposits thats what turbo technics say anyway

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Posted 20th Jan 2011 at 02:58

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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

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Post #9

It does sound like worn blower oil seals I must admit......... :-(

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Posted 20th Jan 2011 at 03:13

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binkagti

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Location: canterbury

Registered: 14 Oct 2006

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Post #10

Rubbish, along with a full suspension over haul and rebuilding the head and now possible bolloxed turbo, plus saving to go for france in sept not looking good at all.

Also thinking about it on the last kent meet the car on tickover was spitting out black what looked like carbon deposits from the exhaust, could be oil from the turbo??

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Posted 20th Jan 2011 at 03:20

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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

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Post #11

Get the turbo rebuilt if that is the problem, I have a contact at a turbo place in Halifax that will do me a good deal, and a top notch job if that's any help binka?!

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Posted 20th Jan 2011 at 03:22

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binkagti

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Location: canterbury

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Post #12

Yes mate, could be a big help, its a custom t34/35 hybrid, hopefully not to much money, knowing my luck it will be.

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Posted 20th Jan 2011 at 03:23

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chrisd306

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Location: Perth Scotland

Registered: 26 Nov 2005

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Post #13

id go with bent valves or stem seals as mine is a tapper and when giving it the beams and lift off, i get a puff off smoke, also i use oil on track days.

Im going to get a new head eventually

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Posted 20th Jan 2011 at 03:54

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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

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Post #14

Oil smoke on over run is a classic sign ov worn out valve stem oil seals, the vacuum from the cylinders drags oil from the lifter bores into the cylinders. The smoke goes away when you get back on the throttle as positive is restored. Not 100% but if you say the head sounds like a handfull of M8 bolts in a tumble dryer that's where I would start looking. Whats the mileage?

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Posted 20th Jan 2011 at 04:11

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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

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Post #15

Binka, if the turbo wants doin in the end give me a pm il sort out some contact details for ya! Wink

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Posted 20th Jan 2011 at 05:25

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binkagti

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Location: canterbury

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Post #16

Cheers jeffers, daveyboy yeah the head is quite loud, driveable but loud. It was meant to have a new head on it around 5000 miles ago lol, which was obviously not new at the time, must have been secondhand.

Think will get the head done then see if the problem still persists, if it does i know its the turbo

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Posted 20th Jan 2011 at 13:25

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rich_w

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Location: Havant, Hampshire

Registered: 29 Jul 2004

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Post #17

It could also be rings, for the same reasons Daveyboy discussed with regards to the stem seals.

Under boost the rings are forced to expand against the cylinder walls, but on lift off the vacuum conditions can draw oil past the rings into the combustion chamber.

When the heads off I would pop a piston out and at least inspect it, not much extra work.

Did they replace the rings as part of the rebuild after the rod broke?

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Posted 20th Jan 2011 at 15:55

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binkagti

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Location: canterbury

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Post #18

Yes mate they replaced these

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Posted 20th Jan 2011 at 22:42

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phillipm

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Location: Rotherham

Registered: 15 Oct 2006

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Post #19

daveyboy wrote:

Oil smoke on over run is a classic sign ov worn out valve stem oil seals, the vacuum from the cylinders drags oil from the lifter bores into the cylinders.

This is what I'd be looking at if the top end is making a noise, either the oil seals or the valve guides themselves.

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Posted 20th Jan 2011 at 23:17

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binkagti

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Post #20

Mega money to fix??

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Posted 20th Jan 2011 at 23:59

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mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

Posts: 9,127

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Post #21

Can only echoe whats been said.. only thing i can say is the rate of oil loss will determine if its stem, rings, or turbo respectively..

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Posted 21st Jan 2011 at 00:22

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binkagti

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Location: canterbury

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Post #22

About half a ltr per 1000 miles roughly

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Posted 21st Jan 2011 at 02:03

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whizzer 71

Regular

Location: Sandwich

Registered: 17 Apr 2005

Posts: 140

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Post #23

Normally if turbo is shot itll draw under vacumm, Ie when off throttle on over run or goin down hill so when you re apply throttle you get clouds, also can sometimes get blue haze on idle which will then clear after 30 secs or so on partial throttle, around 2k or so

Posted 21st Jan 2011 at 03:16

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binkagti

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Location: canterbury

Registered: 14 Oct 2006

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Post #24

No smoke on idle, does not smoke while coasting down a hill, only does it after taking it to the redline and then letting of. Also when reapplying throttle there is no smoke either.

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Posted 21st Jan 2011 at 03:19

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mabgti

NV motors

Location: Bham tunnel @7400rpm

Registered: 28 Aug 2003

Posts: 9,127

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Post #25

Bent valve causing damaged stem seals Yes

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Posted 21st Jan 2011 at 05:14

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