I think my 727 is fried. Now I'm at a crossroads...

Transmission and Drivetrain Tech

Fried 727 in a car you plan to convert to 4 speed. What would you do?

  1. Rebuild the 727 and run it until you're ready for the 4 speed conversion

  2. Do the conversion now and worry about the engine rebuild later

  3. Find a cliff, push the car over it, and never look back

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  1. Righty Tighty

    Righty Tighty FABO Gold Member FABO Gold Member

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    Oh believe me, PLENTY of swear words/wrenches/empty beer cans have been thrown around. But I only have myself to blame...after all, I could've just taken it to a shop this whole time, but nooooooo...I'm stubborn and want to learn how to do this.
     
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    • Swinger 340

      Swinger 340 Well-Known Member

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      That's why I have a sigh on the front door stating, "ENTER AT YOUR OWN RISK".
       
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      • CudaFactHackJob

        CudaFactHackJob Well-Known Member

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        That's why my medical bracelet says, "I am an alcoholic; in case of accident; get me a beer!!
         
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        • Swinger 340

          Swinger 340 Well-Known Member

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          Should that Quote be, "get me "ANOTHER" beer"?
           
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          • CudaFactHackJob

            CudaFactHackJob Well-Known Member

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            Nope...."Time to do shots!"
             
          • Righty Tighty

            Righty Tighty FABO Gold Member FABO Gold Member

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            Okay, I’ve attached a link to a video I took with the cooler line disconnected. The first few seconds looks like it’s purging some air, then gets a flow. My question is how much flow at idle should it have? The fluid level is 1/3 between “ADD 1 PINT” and “FULL.”

            https://youtube.com/shorts/buysVJ0Uj-c?feature=share
             
          • Righty Tighty

            Righty Tighty FABO Gold Member FABO Gold Member

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          • CudaFactHackJob

            CudaFactHackJob Well-Known Member

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            Have you been running that trans below the full mark? Below full is not full.
             
          • Righty Tighty

            Righty Tighty FABO Gold Member FABO Gold Member

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            No, I've been running it right at the full mark. For the test, I was filling it and realized I forgot to re-attach the drive shaft when I heard fluid dripping on the floor. So, the level it was at was where it stopped leaking out of the tail shaft housing (minus whatever went back into the converter, I'm guessing).
             
          • CudaFactHackJob

            CudaFactHackJob Well-Known Member

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            The way you have that line disconnected is only testing the line coming from the trans; not the cooler and not the return line.
             
          • Righty Tighty

            Righty Tighty FABO Gold Member FABO Gold Member

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            Shit. All I saw was "remove the output line" and thought he was talking about the output from the transmission.

            Engine's out, but I'm starting a 48 hour shift today. Won't be able to get to it until Tuesday. I'm going to get a converter ordered preemptively but I'll post pics of the snout ASAP.
            56EC7699-AB2B-4344-A31B-D6B6F258EF7E.jpg
             
          • CudaFactHackJob

            CudaFactHackJob Well-Known Member

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            That's a pretty awesome looking motor there bro...
             
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            • jimjimjimmy

              jimjimjimmy lobsterman FABO Gold Member

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              maybe you could weld up the pistons for him for more compression .
               
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              • CudaFactHackJob

                CudaFactHackJob Well-Known Member

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                I have to do my brother's Toyota truck first!....GOOGLE IT!!...
                 
              • Righty Tighty

                Righty Tighty FABO Gold Member FABO Gold Member

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                Converter arrived yesterday....next day delivery from Summit! Anyway, rebuilding the front end today and will post pics of the old converter/pump/bushing soon.

                I did notice something peculiar on the headers though. The headers are newish and polished, but #6 and 7 both look dull, like they got REAL hot. I'm going to pull all the plugs and have a look. I have a thread going on about a misfire I can't fix, but I'll ask here as well: what could make just two cylinders run so much hotter than the rest?
                 
              • Swinger 340

                Swinger 340 Well-Known Member

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                I'm no expert here, but my 2 cts. would be, maybe in time they will all look the same, being new. The other thought is, maybe those two exhaust valves are opening to soon or not closing all the way. You should here a popping sound. Check compression on those two cylinders.
                 
              • Righty Tighty

                Righty Tighty FABO Gold Member FABO Gold Member

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                I sure hope they don’t all end up dull like that, I paid extra for polished. And I will say that the last time I pulled the plugs, #6 and 7 were badly carbon fouled.
                 
              • Swinger 340

                Swinger 340 Well-Known Member

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                Pull all the plugs and check them also. All carbon fouled ? too rich fuel, wrong heat range or just the two, change out the two wires, maybe they are old and shorted out. Look at the wires in the dark (motor running) and look for an arcing. Uncross wires.
                 
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                • CudaFactHackJob

                  CudaFactHackJob Well-Known Member

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                  Don't 6 & 7 share a runner? And doesn't that runner take the power brake line? Are you losing brake fluid?
                   
                • Righty Tighty

                  Righty Tighty FABO Gold Member FABO Gold Member

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                  I could be wrong but it looks like the power brake line goes to #8? I do lose fluid, but I've always attributed that to my leaky proportioning valve. I pulled the plugs and they are all rich. I do remember richening the mixture when trying to see if that would solve what I thought was a lean condition. Didn't work.

                  Here's the #6 header, you can see how it's dull and some of the finish became powdery.
                  hIBKKIb+SEarXO9iznt7Rw.jpg
                   
                • oldkimmer

                  oldkimmer FABO Gold Member FABO Gold Member

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                  Wow!!! That looks just terrible. Kim
                   
                • Righty Tighty

                  Righty Tighty FABO Gold Member FABO Gold Member

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                  Pulled the plugs yesterday and they're all rich. My wires are new and I've confirmed continuity, plugs are heat range 5. I will say that I richened the idle a bit because I suspected a lean condition, so that may be the cause of the rich plugs. I'll do a compression test once the engine is back in.

                  1+g1UzkhQ7m1EBU83f1Ihw.jpg
                   
                • Swinger 340

                  Swinger 340 Well-Known Member

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                  Are you sure you have the right plugs? They look like GM plugs, short threads.
                   
                • Righty Tighty

                  Righty Tighty FABO Gold Member FABO Gold Member

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                  Hmm, since you're asking that question....no I'm not sure. Should my plugs have longer threads?
                   
                • Swinger 340

                  Swinger 340 Well-Known Member

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                  I only have small blocks and they use N9yc or N12yc, long thread. Check your app.
                   
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