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drivers side exhaust front down pipe removal

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

drivers side exhaust front down pipe removal

Post by guitarman1951 »

My 1968 250 v8, ( manual steering model). has a loose front pipe. at the manifold. drivers side. The 4 nuts will not move. Been reading some horror stories saying the head must come off to get to the manifold and then the 4 exhaust down pipe studs and nuts. Got a good pit , and my next step is to remove the send and return auto box fluid pipes that go to the rad, giving me a bit space to maybe get some heat and a socket on to them .Failing that, can the manifold and down pipe be removed??.

classiclife
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Re: drivers side exhaust front down pipe removal

Post by classiclife »

Hello Brian,

To assist getting the pipe to manifold nuts off, I would leave the manifold in situ for the moment as you will need as much stability / leverage to tackle these nuts.

The nuts should be brass and a combination of Plus Gas (not WD40) plus heat will eventually free them off - it's not going to be a quick job, but you have a pit which will be a big bonus for access.

When you have removed the nuts, you can then unbolt the manifold to head nuts; this allows removal of the downpipe by manipulating the exhaust manifold.

Of note, you will need to fit new LONGER studs as the current pipe to manifold compressible sealing ring is too thick to use the old studs as the nuts will not bite on to the original stud thread - hence the need to remove the manifold. The original sealing gasket was an asbestos type material.

There is no getting away from it - it is a pig of a job and probably the worst to do. Having had to do this on my saloon, I feel for you !!

Good luck.

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

Re: drivers side exhaust front down pipe removal

Post by guitarman1951 »

Hi Richard,
Thanks for the reply, you helped me with wiring problems in the inner sills in the past. Down in the pit I can see the 4 nuts , well I can see 3 of them the 4th is going to be tricky to get at. I have had the middle and back section of the exhaust off the car and I think this has caused the front pipe o -ring to disintegrate, resulting in a rattle. So Richard, a new flange , does the new flange simply slide over the front pipe, the concertina flexi looks thicker than the flange, hopefully not??. Sng barratt has 2 o-rings , one, after market, might be the crushable one you mention, and the other might be the thinner original. Im thinking the thinner one would allow the old studs to go again, i.e. leave the manifold on the car.

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

Re: drivers side exhaust front down pipe removal

Post by guitarman1951 »

Hi again Richard, I took some photos of the pipe, but computer says NO, too big ,, They are just mobile phone photos can you HELP,,regards Brian

classiclife
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Re: drivers side exhaust front down pipe removal

Post by classiclife »

Hello Brian,

You can use this app to reduce your photos - very simple to use and I created a new folder to store photos on reduction; the Forum allows a max of 2MB.

http://www.imageoptimizer.net/Pages/Home.aspx

I have attached a photo of the compressible sealing rings FYI - these are generally supplied with cylinder head gasket sets etc. The front pipe and manifold have a concave step, of which these compressible seals fit. It is then a case as you tighten up the seal does its job, have to say I have found them to be very effective. The thinner option you mention sounds promising, I've not seen these - nor used them; perhaps another Forum user has.

Hope the above assists ??

Regards.

Richard.
Attachments
DSC00071.JPG
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

Re: drivers side exhaust front down pipe removal

Post by guitarman1951 »

Hi Richard,
Having trouble with the file optimiser, it loads onto my draft, in computer jargon, not a photo. ant idea what Im doing wrong?

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John-B
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Re: drivers side exhaust front down pipe removal

Post by John-B »

As far as I remember, a saved draft on the forum can't hold an attachment. Copy the draft text to a post window, then add the attachment (Attachments, add files, highlight file, open, place inline in post, submit).

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

Re: drivers side exhaust front down pipe removal

Post by guitarman1951 »

Hi Richard, here (hopefully) is a photo looking upwards from the pit, of the 4 nuts on the down pipe, 3 in blue not bad to get at, the white one bit tricky. they appear to be steel.
Optimized-20210620_124942_LI (2) (1).jpg
Note the gear box trans fluid pipes right in the way. With them removed more access. regards Brian

classiclife
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Re: drivers side exhaust front down pipe removal

Post by classiclife »

Hello Brian,

Anything removed to get better access has to be a bonus; I dumped my Autobox cooling pipes as I was converting to manual transmission. I've attached a photo of my refurbished exhaust manifolds showing the seating for the compressible seal and also new studs fitted.

Why folk use steel nuts on manifold to downpipes, I just cannot understand - pure laziness, especially as brass nuts are simple to obtain. Just makes the job even more difficult next time around.

At least your nuts (if you will excuse the wording) do not look chewed up; it will be prudent to use a six sided socket to undo these nuts as you will get a better purchase on them. As mentioned earlier, Plus Gas is the way forward to break the rusted grip.

Regards.

Richard.
Attachments
DSC00324.JPG
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

guitarman1951
Posts: 138
Joined: Mon Jun 11, 2018 10:10 pm
Location: tyne and wear

Re: drivers side exhaust front down pipe removal

Post by guitarman1951 »

I think the nuts are 3/8" 24 TPi, can you remember what size the studs where?

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