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Smokey from one exhaust pipe.

brebner89
Posts: 12
Joined: Tue Sep 05, 2017 10:34 am
Location: Aberdeenshire.

Smokey from one exhaust pipe.

Postby brebner89 » Tue Apr 16, 2019 1:16 am

Unfortunately my car has smoke from only one exhaust. (Passenger side)
Smokes when it gets up to running temperate.
The possible symptoms are i guess:
Valve stem seals?
Piston rings?
Anyone had this issue or similar?
Anything else i can check.
If its rings i now wont be a cheap fix but could be worth the expense without breaking the car.
Any help would be much appreciated.
1994 XJ12/81.
Silver Frost.
No: 706577
Aberdeenshire Scotland.

pimgmx
Posts: 3404
Joined: Tue Jul 08, 2014 12:07 pm
Location: South East of the Netherlands

Re: Smokey from one exhaust pipe.

Postby pimgmx » Tue Apr 16, 2019 7:48 am

Worn valve stem seals usually show at startup, rather than when warm?

Are you sure it is oil smoke, i.e. blueish in colour?
Have you noticed above-average oil consumption?

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Brake buster
Snr Member
Posts: 724
Joined: Sun Jul 03, 2016 8:18 pm
Location: Gloucester UK

Re: Smokey from one exhaust pipe.

Postby Brake buster » Tue Apr 16, 2019 8:39 am

i would start with a general check of all fluids , and make sure they are correct level and not cross contaminated

next would be to do a compression check on all cylinders

this will give you a base line

the V12 valves have been known to stick ,

just for elimination , the vacuum modulator on the auto gearbox has a seal, if this fails ATF can be drawn up the vac line to the engine causing white smoke , this can be intermittent to start with then full on white smoke as the seal gives way completely ,

hope its a simple issue , as v12 head removal or piston ring replacement is a big job

BB
1994 3.2S in Morocco red and Doeskin/Ruby red interior
1989 V12 XJS White with Mulberry interior
2015 XF Sportbrake Luxury 2.2D Turbo in British Racing Green Metallic

NMV 1E
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Posts: 1055
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Location: Lydiate, Merseyside.

Re: Smokey from one exhaust pipe.

Postby NMV 1E » Thu Apr 18, 2019 10:56 am

I'd also check the vague possibility that the brake servo (booster) isn't letting brake fluid into the inlet system :?: Though on second thoughts very unlikely with the "Tives" system used on the 40 / 81 :?:
Life begins at Forty !... I was born with nothing, I seem to have most of it left.

2002 Titan Silver BMW 316ti Auto Compact
2000 Bright Green V.W. Golf Avantgarde Cabriolet
1989 White and Navy Blue V.W. Golf Cabriolet (G.T.i.)

brebner89
Posts: 12
Joined: Tue Sep 05, 2017 10:34 am
Location: Aberdeenshire.

Re: Smokey from one exhaust pipe.

Postby brebner89 » Tue Apr 23, 2019 4:58 am

Yes blueish in colour. Havent noticed the consumption as it has been like this since i bought it.
Have not done a lot of miles with it yet to find out.

pimgmx wrote:Worn valve stem seals usually show at startup, rather than when warm?

Are you sure it is oil smoke, i.e. blueish in colour?
Have you noticed above-average oil consumption?
1994 XJ12/81.
Silver Frost.
No: 706577
Aberdeenshire Scotland.

brebner89
Posts: 12
Joined: Tue Sep 05, 2017 10:34 am
Location: Aberdeenshire.

Re: Smokey from one exhaust pipe.

Postby brebner89 » Tue Apr 23, 2019 5:02 am

As its only one exhaust it means its only one bank of cylinders?
the car had been sitting about 4 years prior to my purchasing it so could be sticky valve.
The gearbox oil connected to exhaust?
I understand any work on the bowls of the engine will be a big job. Will need to be 100% sure on the fault.

Brake buster wrote:i would start with a general check of all fluids , and make sure they are correct level and not cross contaminated

next would be to do a compression check on all cylinders

this will give you a base line

the V12 valves have been known to stick ,

just for elimination , the vacuum modulator on the auto gearbox has a seal, if this fails ATF can be drawn up the vac line to the engine causing white smoke , this can be intermittent to start with then full on white smoke as the seal gives way completely ,

hope its a simple issue , as v12 head removal or piston ring replacement is a big job

BB
1994 XJ12/81.
Silver Frost.
No: 706577
Aberdeenshire Scotland.

brebner89
Posts: 12
Joined: Tue Sep 05, 2017 10:34 am
Location: Aberdeenshire.

Re: Smokey from one exhaust pipe.

Postby brebner89 » Tue Apr 23, 2019 5:04 am

Whats the TIVES system??
NMV 1E wrote:I'd also check the vague possibility that the brake servo (booster) isn't letting brake fluid into the inlet system :?: Though on second thoughts very unlikely with the "Tives" system used on the 40 / 81 :?:
1994 XJ12/81.
Silver Frost.
No: 706577
Aberdeenshire Scotland.

pimgmx
Posts: 3404
Joined: Tue Jul 08, 2014 12:07 pm
Location: South East of the Netherlands

Re: Smokey from one exhaust pipe.

Postby pimgmx » Tue Apr 23, 2019 8:06 am

Teves was the manufacturer of the XJ40/81 brakes.

Theirs used an external pump and pressure sphere for a brake booster instead of the more common engine vacuum-driven systems.

This setup suggests you can rule out brake fluid leak/contamination as a potential cause for your smoke issues.

Per BB’s suggestion: a fluid and filter change (and perhaps an engine oil flush) is a good starting point before digging any deeper.

And yes: smoke on one side only suggests that a single cylinder bank is affected.

the daily: 01 S8 http://bit.ly/2kIwP4m
the eyecatcher: 93 Insignia http://bit.ly/1iGrmsU
the GT: 89 XJS http://bit.ly/1WQGpC5
the diva: 88 Biturbo SI https://bit.ly/3dzdvAL
the ex: 93 3.2 http://bit.ly/14GTNrq

leo_denmark
Posts: 762
Joined: Sun Sep 11, 2011 6:32 pm
Location: Denmark

Re: Smokey from one exhaust pipe.

Postby leo_denmark » Tue Apr 23, 2019 8:40 am

brebner89 wrote:As its only one exhaust it means its only one bank of cylinders?
the car had been sitting about 4 years prior to my purchasing it so could be sticky valve.
The gearbox oil connected to exhaust?
I understand any work on the bowls of the engine will be a big job. Will need to be 100% sure on the fault.



The gearbox is connected via a vacuum line. If the diaphragm at the gearbox end cracks, the inlet manifold will suck in gearbox oil through this line. If it's anything like an XJ-S V12, it's on the A-bank, RH side.

BR Leo

Brake buster
Snr Member
Posts: 724
Joined: Sun Jul 03, 2016 8:18 pm
Location: Gloucester UK

Re: Smokey from one exhaust pipe.

Postby Brake buster » Tue Apr 23, 2019 2:31 pm

this is the issue with remote diagnosis ,

as i said, do the basics , work from there,

as its sat for four years, a good run of the engine a few times to allow a full heat cycle will do it some good , if you can live with the smoke while doing it

ALL V12 engine will produce white ' steam' during the ' choke ' warmup stage , this is not right from the starting of the engine, mine does it a few minutes into being started up from stone cold and then this ' steam ' stops , its like the exhaust is clearing its throat.........ahem

BB
1994 3.2S in Morocco red and Doeskin/Ruby red interior
1989 V12 XJS White with Mulberry interior
2015 XF Sportbrake Luxury 2.2D Turbo in British Racing Green Metallic