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donmacn



Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 892

Exhaust newbie - do I need to use paste?

Morning all,

Despite working on cars for a few years, I've never actually done any work on exhausts. I think mainly because it's a job that's much easier with a ramp, and I've never had access to one of them - so I've usually left this to garages.

Now though, as part of the rebuild/refurb I have a quality stainless exhaust to fit, and find I'm lacking some basic experience.

The mounts and clamps will be easy enough ( good quality T- bolt clamps etc ) but when I'm assembling it - a stainless exhaust - do I need to use any kind of paste or sealant on the pipe joins?

Thanks in advance

(300Tdi 110 if it makes any difference) Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html)
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #810838 18th Jan 2020 11:12am
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htb2



Member Since: 02 Nov 2018
Location: aberdeenshire
Posts: 131

Scotland 

Didn't, with my stainless system on my 300tdi 90, No problems since or at MOT time

Post #810839 18th Jan 2020 11:26am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 4024

2006 Defender 110 Td5 USW Zermatt Silver

No. Not needed

Post #810840 18th Jan 2020 11:26am
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donmacn



Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 892

Thanks very much gents. It certainly makes life easier.

I knew exhaust paste existed, so kind of thought it might be for routine use. Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html)
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #810852 18th Jan 2020 2:57pm
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htb2



Member Since: 02 Nov 2018
Location: aberdeenshire
Posts: 131

Scotland 

Bodgers paste for filling gaps in misaligned sections.

Post #810864 18th Jan 2020 4:20pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 17544

United Kingdom 

Flanged mating surfaces on the Defender systems so not used. (Unless aftermarket.)I didn’t either.
The only place sealant paste would be used that I could think of is two scenarios.

1.) Misalignment causing exhaust gas leaks, temporary solution. Should be fixed properly.

2.) Sleeve fittings with clamps, mainly due to again misalignment.

I wouldn’t use it really unless you find it’s required, more of a fix than a requirement. 🇬🇧 Made In GB. 🇬🇧

It May Not Be Very Fast, Never Has Slow Looked More Bad As*.

Post #810880 18th Jan 2020 5:32pm
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Litch



Member Since: 10 Mar 2013
Location: Beds
Posts: 484

England 

As above, paste should not be required.

As a matter of interest what make of exhaust have you bought, if it is a DoubleS then check it before fitting? Confused
I bought one for my 300TDi 90 several years ago and it went straight back due to the poor quality of manufacture. Not only was the CSA of the pipe considerably smaller than the genuine system it was replacing but the downpipe was flattened at the 90degree bend. When I queried it with DoubleS they said it wasn't a problem and they had sold lots like it! Needless to say it went straight back and the SS system I replaced it with was properly built and fitted & worked perfectly.

Took delivery yesterday of a Demand SS system...…………………… lovely! Very Happy


DoubleS downpipe.


Click image to enlarge




Click image to enlarge



Demand system (stock photo).


Click image to enlarge
 ONE LIFE, GET IT!

Post #810889 18th Jan 2020 6:46pm
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donmacn



Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 892

^^^

I think I'd seen this thread/post about these exhausts before, and registered enough to know that it wasn't an option I would go for. I've got a Griffin system for mine - appropriate for all the other engine mods/enhancements which I've found myself doing/having done.

Won't say any more at the moment - not trying to be a t*ss*r, tease or any such thing, just that I'm kind of looking forward to the big 'reveal' in my rebuild thread below. Confused Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html)
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #810917 18th Jan 2020 10:29pm
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donmacn



Member Since: 06 Nov 2017
Location: Nth Scotland
Posts: 892

custom90steve wrote:
Flanged mating surfaces on the Defender systems so not used. (Unless aftermarket.)I didn’t either.
The only place sealant paste would be used that I could think of is two scenarios. .


Steve - thanks - hadn't seen your reply earlier on the phone.

As above, hopefully the quality of the Griffin system will avoid any such issues.


But... a more general question after all of the above feedback. If there were small leaks in the system, how would I know? I know what a blown exhaust sounds like - even a 1.2 Clio can sound like a Harley - but if it was 95% OK, just leaking slightly, would I be listening for soemthing, or looking for soot traces, or what...? As I say, I've just never done this particular job before. Donald

1994 Defender 300Tdi 110 SW - owned since 2002 - 230k miles and going strong
(The 'rolling restoration' or tinkering thread: http://www.defender2.net/forum/topic58538.html)
2000 Range Rover P38 4.0L V8

in the past..
RR classic - fitted with 200Tdi
1984 RR classic - V8 with ZF auto box
1993 Discovery 300Tdi

not to mention the minis and the Type 2 VW camper...

Post #810923 18th Jan 2020 10:59pm
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