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Smokey from one exhaust pipe.

brebner89
Posts: 11
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: 3355
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
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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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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.


2006 Baby Blue Hyundai Getz 1.4 CDX, Auto (yes I know, I know, but you'd be surprised, I was !)
1989 White and Navy Blue V.W. Golf Cabriolet (G.T.i.)

brebner89
Posts: 11
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: 11
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: 11
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: 3355
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 tractor: 77 LaRo LW https://bit.ly/2Hr9n6y
the eyecatcher: 93 Insignia http://bit.ly/1iGrmsU
the GT: 89 XJS http://bit.ly/1WQGpC5
the project: 95 X306 http://bit.ly/1cW11DN
the pocket rocket: 97 Z3 http://bit.ly/12IfE7B
the ex: 93 3.2 http://bit.ly/14GTNrq

leo_denmark
Posts: 766
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
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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