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Graham Griffiths
New User
Username: cineprojectorman

Post Number: 3
Registered: 5-2017
Posted on Wednesday, 20 September, 2017 - 05:19:   Edit PostDelete PostView Post/Check IP

Hi,
Iím somewhat alarmed by the engine oil consumption Ė about 1ľ litres per 230 miles! No blue smoke from exhaust. I have not found any info on the internet. My specialist informs me Rolls Royce say the oil consumption on this V8 engine is in the range of 8 pints per 1000 miles, can this be right? Iím using GTX 10W/40

Petrol smell in boot soon dissipates if boot lid left open for a while Ė Iíve had this problem since new. JD Barclay attempted a fix by applying silicone sealant to the fuel sender unit but to no avail. Recently Iíve examined all the hoses from the tank and all seem OK. A foam pad under the tank on the left is a bit guey. Anyone any ideas of what it might be?
Thanks

I've added a new page to my Website http://www.gbg.talktalk.net/rolls-royce-silver-spirit-repairs-and-fixes.html
Members may be interested in some of the problems I've fixed over the years with my Silver Spirit.
Regards
Graham
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Roderick Waite
Prolific User
Username: rodwaite

Post Number: 168
Registered: 1-2012
Posted on Wednesday, 20 September, 2017 - 05:57:   Edit PostDelete PostView Post/Check IP

Hello Graham, sounds OK to me. I have a 1984 Series 1 (SU carbs) that gets through a couple of litres per 1000 miles, and a lot of that is a leak from the cambox cover. I use Total 15W/40 mineral oil. Zero discernible smoke. I don't worry about it. Nor about the whiff of petrol when I open the boot. I've had the car for 8 years and it's always been there. I figure it's the petrol filler hose into the tank, which I think is canvas covered neoprene like the old petrol pumps had - they always smelled of petrol too. Impregnation with age.
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Mark Aldridge
Grand Master
Username: mark_aldridge

Post Number: 458
Registered: 10-2008
Posted on Wednesday, 20 September, 2017 - 07:05:   Edit PostDelete PostView Post/Check IP

Graham, my 1983 Mulsanne oil consumption is about 400 miles per pint, the same as my Shadow 1. Both have about 150k miles on the clock. My wife's 1988 Bentley 8 is about 700 miles per pint but this has different valve stem oil seals to the earlier cars and the engine has about 50k miles.I use 15w/50 oil. I would have thought anything under 150 miles per pint a bit heavy, but my old Spirit only did 100 miles per pint at best with 20w/50 oil and STP and ran well enough although it would smoke if idling for long periods eg in motorway holdups ( common in the UK !)
Mark
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gary webb
Experienced User
Username: webbgw

Post Number: 17
Registered: 6-2014
Posted on Wednesday, 20 September, 2017 - 07:59:   Edit PostDelete PostView Post/Check IP

hi all
spirit / spur
fuel vapour trap near filler hose 2 hoses fall off or split
gary
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Omar M. Shams
Grand Master
Username: omar

Post Number: 1321
Registered: 4-2009
Posted on Thursday, 21 September, 2017 - 01:45:   Edit PostDelete PostView Post/Check IP

Dear Graham,
where is all this oil going?
is your breather mesh clean?
is the oil level sender unit leaking oil on to the floor?
Is your dipstick fully home when measuring?
Thanks
Omar
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Graham Griffiths
New User
Username: cineprojectorman

Post Number: 4
Registered: 5-2017
Posted on Friday, 22 September, 2017 - 03:04:   Edit PostDelete PostView Post/Check IP

Gary, I've checked the hoses and clips and they seem fine. Have a look at the photo at the base the fuel tank, not sure what's going on here. As I said I've had this fuel odour since new.

RR SS series 1 Fuel-tank

Omar, I have a drip tray in my garage under the engine and gearbox. I do get a little oil over many months, perhaps enough to half fill a jam jar.
Yes, the dipstick is pushed home. I don't know were the "breather mesh" is, perhaps the RR SS series 1 did'nt have one?

A mate followed me behind on the motor way going slightly uphill, he said a burst of light grey smoke happened when I put my foot to the floor. Turning off the motorway onto a side road going down hill I let the car coast at about 40 MPH then floored it and says he saw light grey smoke from my exhaust.

Thanks for your comments, any suggestions welcome
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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 1523
Registered: 9-2004
Posted on Friday, 22 September, 2017 - 03:36:   Edit PostDelete PostView Post/Check IP

Cylinder leak test first for piston ring/bore blow by.
If ok replace inlet valve seals.
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Mark Aldridge
Grand Master
Username: mark_aldridge

Post Number: 459
Registered: 10-2008
Posted on Friday, 22 September, 2017 - 03:57:   Edit PostDelete PostView Post/Check IP

Graham, are any of the plugs heavily coated in carbon or oily ? Particularly the back plugs on each bank.
Mark
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Jim Walters
Prolific User
Username: jim_walters

Post Number: 121
Registered: 1-2014
Posted on Friday, 22 September, 2017 - 04:02:   Edit PostDelete PostView Post/Check IP

Graham, the O ring seal is leaking at the tank outlet to the fuel pump. There is a large circlip that holds the fitting into the bottom of the tank. You need to remove the tank to clean up the fuel under the tank and to replace the O ring. With all that gas laying in there all you need is one spark and your car could literally blow up.



This is what you will find under the tank. Notice the pools of gas in the depressions in the boot floor in the first photo.



This is what it looks like after cleaning off all the gas soaked tar under the tank. Instructions for removal of the tank are in TSD4400. Get some plastic tree falling wedges or cut some hardwood ones. You will need four to get the tank unstuck from the tar covering the floor under the tank.

SRH8505 SRC18015 SRE22493 NAC-05370
www.bristolmotors.com
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Jim Walters
Prolific User
Username: jim_walters

Post Number: 122
Registered: 1-2014
Posted on Friday, 22 September, 2017 - 04:09:   Edit PostDelete PostView Post/Check IP

Here is how to get the tank unstuck from the tar it rests on using plastic wedges:



SRH8505 SRC18015 SRE22493 NAC-05370
www.bristolmotors.com
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Graham Griffiths
New User
Username: cineprojectorman

Post Number: 5
Registered: 5-2017
Posted on Saturday, 23 September, 2017 - 04:40:   Edit PostDelete PostView Post/Check IP

Jim, Thanks for your info and photos. Can I assume the flow and return fuel hoses connect directly towards the right hand side of your tank through the hole in the floor? The fuel sender is more to the left of my tank, I wonder if the position of the outlet pipes of the UK tank is different to the north American version?

Fuel tank staining area RR SS series 1.jpg

As my problem appears to be on the left hand side, could there be something else around this area causing the petrol odour in the boot/trunk?
I've wiped the staining and guey like sponges, sniffed the rag, no smell of petrol/gas. [see photo] I've no stains towards the right hand side.

Regards

Graham
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Roderick Waite
Prolific User
Username: rodwaite

Post Number: 169
Registered: 1-2012
Posted on Saturday, 23 September, 2017 - 04:56:   Edit PostDelete PostView Post/Check IP

Hello Jim / Graham - an actual leak as you describe would surely give off a powerful petrol smell obvious throughout the car all the time? In my case it's a whiff that dissipates very quickly when the boot is opened - been like that for 8 years. I still think it's the filler hose that has become impregnated over the years.
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Jim Walters
Prolific User
Username: jim_walters

Post Number: 123
Registered: 1-2014
Posted on Saturday, 23 September, 2017 - 16:52:   Edit PostDelete PostView Post/Check IP

Graham, the flow and return hoses are to the left of centre. This was on a customer's LHD Spur last spring. I have had a couple SZ's in with the same issue, both were the O ring. The filler is also on the left side, is it on the right on yours? There can only be two causes of the insulation on the bottom getting gooey, gas or LHM from careless changing of the gas spring. Even though the area under the tank on this car was flooded, the smell was not overpowering. If it is the fuel feed hose or the O ring on the fitting it attaches to there will be some evidence of gas leaking under the car too. Get it up on a hoist and you will see if there is a leak there.

SRH8505 SRC18015 SRE22493 NAC-05370
www.bristolmotors.com
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Graham Griffiths
New User
Username: cineprojectorman

Post Number: 6
Registered: 5-2017
Posted on Saturday, 23 September, 2017 - 22:24:   Edit PostDelete PostView Post/Check IP

Hi

Roderick, I've lived with this fuel smell since the car was new, and as you say dissipates very quickly when the boot is opened.
I wonder if this is common on early Spirits? J D Barclay in Oxford never fixed it. Not found much info about this on the internet.
Meanwhile I've wrapped tissue paper around the filler hose to see if there's a staining or smell. Also replaced the rubber "O" ring in the fuel filler cap as I'm told they deteriorate.

Jim, I did indeed have the gas springs replaced a while ago, so it may well be dried up LHM - thanks! My Silver spirit 1981 RHD appears to have a different fuel tank to yours, the fuel filler is on the NS and the fuel connections on the tank are on the right [see photo and TSD4400 pdf showing tank and fuel lines] I'm not aware of any fuel leak under the car at this point.

Fuel tank UR20306 1980-82 (VIN 1001-3326)

application/pdfSilver Spirit fuel hoses and tank
Silver Spirit fuel hoses and tank.pdf (444.6 k)


My RR specialist says to overcome the cars high oil consumption the valve stem seals need replacing, they are suggesting sticking with the original cotton type as they have had problems with the newer modified part - what would you advise?

Thanks for your comments,

Graham

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