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Thread: 77 Corona Exhaust Issue

  1. #1

    77 Corona Exhaust Issue

    So I just bought my 77 Corona Wagon and I'm super excited! I bought it here near San Francisco where I am staying with my uncle. I have to drive it home to Oregon soon so I have been getting it ready for the trip.

    So far this is what I have replaced:
    Air Filter
    Fuel Filter
    Engine Oil/Filter
    Transmission Oil

    There was an exhaust leak around the manifold so I inspected the gasket, turned out there wasn't even a gasket in there! The manifold flange was warped about .03, so I had a machine shop make it flat again. The head isn't warped at all so I put it all back together with new gaskets. There is an inner heat shield that goes in between the manifold and the head, so the setup goes like this:
    Head+gasket+heat shield+gasket+manifold
    It all went together well and I put new gaskets where it meets the exhaust pipe.
    I started it up and it is still leaking exhaust at the manifold!
    So, there is this pipe that mates to the exhaust manifold at two spots on the top of the manifold. (i'll try and get some pics if it will help) I think it is leaking from those spots. I put new gaskets in there but it still doesn't seem like its seating right. I'm going to modify the gasket a little tomorrow to see if I can make it mate better, but I was wondering if anyone had any insight to this?
    Does anyone know what this pipe even is? Or what it does? Can I remove it?

    Thanks for the help I'm a noob to the forum but I love my new Corona!!!

  2. #2


    I just did a bunch more searching and found out that the pipe is part of the emissions system. If I were to remove the pipe, I would have to block off both the ports on the exhaust manifold. What else would I have to do? LC Engineering makes a block off plate kit for the EGR system, but i'm not sure if it has the plates for the manifold or not. I'm going to call them tomorrow and see what they say.
    Any insight is welcome.

  3. #3
    Senior Member
    Join Date
    Apr 2009
    Central Fl
    you could make the plates your self out of some mild steel or get a header. If you block off the egr you have to do it on the head as well

  4. #4



    So the gasket where the air circulation pipe connect to the header looks like this: oOo the bid O is the port leading inside the manifold and the small o's are the bolt holes. I ended up cutting off the o's so it could seat deeper onto the gasket and it seals almost perfect now. I will leave this until I get back to Oregon and then remove the whole EGR system.
    After I finished that, there was a loud noise at the Catalytic converter. So I took it off, cut off the flanges, picked up a 1 3/4 straight pipe and had a shop weld it together. Now it sounds nice!

    I have the opportunity to pick up a set of Mukini 44's with an intake manifold included. What would I have to do/change to make the switch? Any help would be great!

  5. #5
    Join Date
    Jan 2007
    Welcome to JNC. post some pics of the trip!

  6. #6


    I will take some pics on the trip home for sure! For now I thought I could post some pics of my trip down here. I rode my bicycle. Check it out!

    Ummm. I got to this point and can't figure out how to upload pics from my computer.


  7. #7
    Senior Member
    Join Date
    Sep 2008
    Boston, Assachusetts
    Any pics of your new wagon?

  8. #8

    pic problem

    Refer to above...I don't understand yet how to post pictures from my computer. Can you help?

  9. #9
    Join Date
    Jan 2007

    Re: pic problem

    Quote Originally Posted by znewton
    Refer to above...I don't understand yet how to post pictures from my computer. Can you help?
    Look at the FAQ stickied at the top of each forum.

  10. #10


    Alright here goes. This was my bicycle trip down to San Francisco where I got the '77 Corona Wagon!

    I'll get some pics of the Wagon soon!

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