Exhaust manifold

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Exhaust manifold

Postby mikeydpippin » Tue Mar 14, 2017 3:46 pm

Can someone give me an idea on what to use to swage the exhaust pipe where it enters the cylinder head, and if I need to heat the end of the exhaust.
I,ve tried but failed so far and no amount of exhaust paste seems to stop it popping out during a decent run, (I,m not giving it a lot of welly to blow the exhaust out the head).

Also, on return from a good run and the engine turned off there seems to bit a lot of smoke rising from the engine until it cools is there a cure for this, as I don't get the same problems with the other Matchless G3ls.
1958 Matchless G3ls Alternator, 12v ignition.
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Re: Exhaust manifold

Postby Rob Harknett » Tue Mar 14, 2017 4:05 pm

If the exhaust is popping out the head, it must be coming loose on the fitting.

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Re: Exhaust manifold

Postby Mick D » Tue Mar 14, 2017 4:24 pm

Hi

Forget the bodges for now and try a bit of sequential assembly, if you haven't already done so ;)

Take off the complete exhaust system and separate the pipe from the silencer - fit the pipe into the head, it should go in about 1 1/2" - ensuring the pipe stays fully into the head, (put a bit of tape on to indicate), fit the pipe to the stay and tighten fully - fit the silencer to the pipe and tighten - fit the silencer to the frame and tighten, (you may need to adjust the position of the silencer on the pipe for a perfect alignment at the frame but make sure the joint between the silencer and pipe is fully tightened before attaching the silencer to the frame).

Give that a go.

Regards Mick

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Re: Exhaust manifold

Postby clive » Tue Mar 14, 2017 4:48 pm

No assembly arrangement is going to work if the pipe has been chattering in and out of the head, although I totally agree with the process. The old advice was to use a carrot shaped hard wood bung slightly larger than the pipe bore and wack it in to spread the pipe. I have a metal one I have used for years, however I have also used an old wheel spindle, rammed down the pipe and then ground round and round. What you are aiming to do is open out the pipe until the fit is difficult into the head. If I can I go a bit too far and then gently dress back the leading edge with a hammer. This holds it all in place even when you open it up.

smoking engine on stopping suggests an oil leak up high so the engine is misted. I recently found I had a small gap in the tappet inspection cover rubber seal which was allowing a gentle mist to cover the engine. Also look at the rocker cover gasket, the pushrod tube top gasket and the oil supply to the rockers for leaks
clive
if it ain't broke don't fix

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Re: Exhaust manifold

Postby Mick D » Tue Mar 14, 2017 4:58 pm

Hi Clive

Sorry but I have to disagree - if the pipe is fully home in the head and the system attachment points at the stay, pipe to silencer, and silencer to frame are secure the pipe cannot come out of the head, rattle / leak yes but not dislodge.

Regards Mick

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Re: Exhaust manifold

Postby poplargreg » Tue Mar 14, 2017 6:09 pm

A squirt of silicon sealant will stop it rattling and leaking

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Re: Exhaust manifold

Postby mikeydpippin » Tue Mar 14, 2017 8:00 pm

Thanks for the replies Chaps, will try all of the above, I have been using Eap5 exhaust paste, maybe I will try silicon, would this be ok?

http://www.toolstation.com/shop/p73415? ... 0wodQXAC_Q
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Re: Exhaust manifold

Postby dave16mct » Tue Mar 14, 2017 8:12 pm

That would be perfect!

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Re: Exhaust manifold

Postby dave16mct » Tue Mar 14, 2017 8:12 pm

Oops!
Last edited by dave16mct on Tue Mar 14, 2017 8:19 pm, edited 1 time in total.

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Re: Exhaust manifold

Postby mikeydpippin » Tue Mar 14, 2017 8:17 pm

Thanks Dave. 👍🙏
Mike

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