Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 15th July 2019, 08:39   #1
Rev Jules
Rev Jules
 
Rev Jules's Avatar
 
Rover 75 Tourer+

Join Date: Mar 2011
Location: Radcliffe on Trent
Posts: 10,703
Thanks: 7,308
Thanked 3,929 Times in 2,051 Posts
Default Viton Ring Question?



If they are connected to the Intercooler, where does the oil come from to cause smoke out of the exhaust, how does the misting of oil occur on the outside of the hose.
Is this the only pipe that has these rings.
Many Thanks.

Rev.
Rev Jules is offline   Reply With Quote
Old 15th July 2019, 09:14   #2
kaiser
This is my second home
 
kaiser's Avatar
 
75 Tourer 2.5 Auto, 1.8T, 75V8ZT

Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
Default

The turbines in the turbo housing require oil to lubricate the bearings on their shafts. They spin at very high revs!. The oil is supplied via an oil hose fed from the engine. If the seals around the bearings are leaking, oil will be blown into the cylinders, mixed with the charge. That will cause blue smoke.
The charge is passed through the inter cooler on the way to the combustion. If there are any leaks, you will see oil here as well.
__________________
Worth his V8 in gold
kaiser is offline   Reply With Quote
Old 15th July 2019, 09:21   #3
Rev Jules
Rev Jules
 
Rev Jules's Avatar
 
Rover 75 Tourer+

Join Date: Mar 2011
Location: Radcliffe on Trent
Posts: 10,703
Thanks: 7,308
Thanked 3,929 Times in 2,051 Posts
Default

Quote:
Originally Posted by kaiser View Post
The turbines in the turbo housing require oil to lubricate the bearings on their shafts. They spin at very high revs!. The oil is supplied via an oil hose fed from the engine. If the seals around the bearings are leaking, oil will be blown into the cylinders, mixed with the charge. That will cause blue smoke.
The charge is passed through the inter cooler on the way to the combustion. If there are any leaks, you will see oil here as well.
Thank you.

So why do people suggest replacing these rings to cure any smoke that may occur.

Rev
Rev Jules is offline   Reply With Quote
Old 15th July 2019, 13:06   #4
grivas
I really should get out more.......
 
grivas's Avatar
 
Rover 75 CDT Club Tourer

Join Date: Nov 2006
Location: Milky Way
Posts: 2,367
Thanks: 105
Thanked 513 Times in 382 Posts
Default

Quote:
Originally Posted by Rev Jules View Post
Thank you.

So why do people suggest replacing these rings to cure any smoke that may occur.

Rev
Hi,
The primary reason the original rings are replaced with viton ones is to ensure there is a proper seal so when you are on turbo boost this is not wasted and thus power output is reduced, the original rings swell in oil!!, and fall off into the intercooler, so there is a leak, so when you put your foot down oily deposits from the exhaust gases are blown off all over the large boost hose that goes from the EGR valve to intercooler.
incidently, when this hose is leaking you should not get blue smoke from exhaust, usually this will be from a blocked PCV valve filter or very rarely a blown turbo seals ( very rare in diesel 75!).
grivas is offline   Reply With Quote
Old 15th July 2019, 21:22   #5
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Quote:
Originally Posted by Rev Jules View Post

If they are connected to the Intercooler, where does the oil come from to cause smoke out of the exhaust, how does the misting of oil occur on the outside of the hose.
Is this the only pipe that has these rings.
Many Thanks.

Rev.
Blue smoke is oil burning, black smoke is diesel.
COLVERT is offline   Reply With Quote
Old 16th July 2019, 21:39   #6
bl52krz
This is my second home
 
bl52krz's Avatar
 
Rover 75 cdt club + Rover 2.5 KV6 Conni SE

Join Date: May 2008
Location: Birmingham
Posts: 11,356
Thanks: 6,587
Thanked 2,262 Times in 1,729 Posts
Default

Hi Jules. Have your rings on the lower part of the pipe to the egr not been changed? If you come to the Nano Meet this Saturday, I’m sure that could be arranged
__________________
Great Barr, Birmingham.
bl52krz is offline   Reply With Quote
Old 16th July 2019, 22:02   #7
Mike Trident
Posted a thing or two
 
Mike Trident's Avatar
 
Rover 75 CDTi Saloon & Citroen C1

Join Date: Jun 2016
Location: Oakenshaw, Near Bradford
Posts: 1,618
Thanks: 385
Thanked 552 Times in 328 Posts
Default

The crankcase ventilation system vents into the inlet, the oil build-up comes from there. If you have a leak at the joint, two things will happen.

1, the oil mist from the crankcase venting system will leak out as there is air pressure from the turbo at those seals. leaking out will make an oily mess!

2, because you are leaking air pressure, your engine is not receiving the air it should be getting, but it is still getting the fuel. So, your engine is being over fueled, which is what causes the black smoke.

Hope this explains it.



Mike
__________________
Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual)
160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control.

BORN
Tuesday, 5th October 2004 @ 12:35:52
This vehicle was the 104,679th 75 to run off the production line, out of 112,381
This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744
This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
Mike Trident is offline   Reply With Quote
Old 17th July 2019, 06:01   #8
Rev Jules
Rev Jules
 
Rev Jules's Avatar
 
Rover 75 Tourer+

Join Date: Mar 2011
Location: Radcliffe on Trent
Posts: 10,703
Thanks: 7,308
Thanked 3,929 Times in 2,051 Posts
Default

Quote:
Originally Posted by Mike Trident View Post
The crankcase ventilation system vents into the inlet, the oil build-up comes from there. If you have a leak at the joint, two things will happen.

1, the oil mist from the crankcase venting system will leak out as there is air pressure from the turbo at those seals. leaking out will make an oily mess!

2, because you are leaking air pressure, your engine is not receiving the air it should be getting, but it is still getting the fuel. So, your engine is being over fueled, which is what causes the black smoke.

Hope this explains.






Mike

Yes is does many thanks.

Rev
Rev Jules is offline   Reply With Quote
Old 17th July 2019, 06:04   #9
Rev Jules
Rev Jules
 
Rev Jules's Avatar
 
Rover 75 Tourer+

Join Date: Mar 2011
Location: Radcliffe on Trent
Posts: 10,703
Thanks: 7,308
Thanked 3,929 Times in 2,051 Posts
Default

Quote:
Originally Posted by bl52krz View Post
Hi Jules. Have your rings on the lower part of the pipe to the egr not been changed? If you come to the Nano Meet this Saturday, I’m sure that could be arranged
No can do! Bit to far away.

Rev
Rev Jules is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:34.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd