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1974 Muffler Change-Help Please!
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Glenn Premium Member
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PostPosted: Thu Aug 15, 2019 10:13 am    Post subject: Re: 1974 Muffler Change-Help Please! Reply with quote

imsjry wrote:
Trying to install the stock muffler is not low on the priority list, especially since the remote oil filer will be in the way of the heat riser hardware on the muffler.

You'll need to move the filter so you can put the missing tin in place. If you don't, you'll COOK the engine and have a much bigger problem.
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SLO-N-LO-69
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PostPosted: Thu Aug 15, 2019 10:18 am    Post subject: Re: 1974 Muffler Change-Help Please! Reply with quote

The gassy smell could be a couple different things. Running too rich, proper hoses missing in the trunk from the fuel tank, gas leak or all of them. Judging by the missing parts in the engine bay I would assume all of them. Dropping the engine will be a great learning experience for you and great fro the car in general. It really isn't that hard of a job but well worth it considering what you can accomplish while it is out.
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PostPosted: Thu Aug 15, 2019 10:23 am    Post subject: Re: 1974 Muffler Change-Help Please! Reply with quote

sjbartnik wrote:
imsjry wrote:


The Air Tin install is first on my list. I made the mistake of taking her for a short spin last night and the engine was sputtering when accelerating after shifting gears and had big gassy smell.

Would that be a symptom of overheating?


Not necessarily, it sounds like an engine in a poor state of tune more than anything.

Get ready to learn about valve adjustments, setting points, ignition timing, and carb tuning + balancing Very Happy


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imsjry
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PostPosted: Fri Aug 16, 2019 1:01 pm    Post subject: Re: 1974 Muffler Change-Help Please! Reply with quote

Rome wrote:
With so many cooling tins missing from the rear of the engine, I wonder if the cooling tins are present on the FRONT? The fan shroud and cooling system on your engine is "most likely" a "doghouse" system. The engine oil cooler is positioned on the left half of the engine. The hot air coming off the cooler to the left is diverted downward and forward via 2 sheetmetal ducts. You can easily feel for these ducts (engine off and cold) by reaching over the top of the left air cleaner towards the middle of the engine. You can also aim the camera in that area, and we should be able to see if the 2 ducts are in place. Hopefully so.


Here is a picture of the back of the tin from the left side facing down. Does this tell you anything? Thanks!

Image may have been reduced in size. Click image to view fullscreen.
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sjbartnik
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PostPosted: Fri Aug 16, 2019 1:43 pm    Post subject: Re: 1974 Muffler Change-Help Please! Reply with quote

Yes you're definitely missing the ductwork that routes the hot air off the oil cooler and out through the front tin. That hot air is supposed to be dumped under the car and not dumped into the engine compartment where it can be picked up by the fan.

It should look like this (stolen from last page):

Image may have been reduced in size. Click image to view fullscreen.

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