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My '85 MGM, "Maisa"

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    They don't typically have any interface material at the exhaust flanges on the manifolds. They do have the gasket at the H-pipe to cats location though. If yours is leaking from the manifold flange, the surfaces aren't interfacing well. Too much rust or maybe a dent?

    Double check the firing order and timing. RPM at idle at operating temp should be about 650 IIRC.

    Lopo firing order: 1-5-4-2-6-3-7-8
    HO/351 firing order: 1-3-7-2-6-5-4-8

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

    Comment


      Originally posted by sly View Post
      They don't typically have any interface material at the exhaust flanges on the manifolds. They do have the gasket at the H-pipe to cats location though. If yours is leaking from the manifold flange, the surfaces aren't interfacing well. Too much rust or maybe a dent?

      Double check the firing order and timing. RPM at idle at operating temp should be about 650 IIRC.

      Lopo firing order: 1-5-4-2-6-3-7-8
      HO/351 firing order: 1-3-7-2-6-5-4-8
      I highly doubt I have any basics related issues, I've gone through everything and anything that I can think of. Engine runs great, just makes a helluva racket.

      The manifold to head flanges were block sanded before install with new quality gaskets, they're not great. I can't feel any leaks from the tops or sides of the exhaust ports. Didn't seem to leak before re-dismantling the engine and I didn't remove the manifolds off the engine last time.

      Probably is the manifold to cat joint that leaks. I did inspect them, no visible issues atleast. Kinda hard to put goop on them, any extra bits would go into the cats. Dunno if I could've clocked them wrong, there's not much adjustment that way, mainly avoid hitting the frame. The end on the manifold looks like it could accept a donut gasket, but the ball flange on the cat pipe is too small.
      1985 Mercury Grand Marquis LS, "Maisa"
      2005 Volvo V70 Bi-Fuel

      Comment


        Here's a video clip of my "diesel" 302 in action, vol 2.

        1985 Mercury Grand Marquis LS, "Maisa"
        2005 Volvo V70 Bi-Fuel

        Comment


          Sounds like every lopo/truck engine I've ever dealt with. I say run it. It should quiet down a little as things seat in. That may take several thousand miles though. Also, it could just be the timing chain initial wear in. Is the sound louder at the front of the engine than the rear? (Mechanic stethoscope would help with this - poke the timing cover behind the water pump on the driver side (nice clear access point away from moving bits) and then poke somewhere in the rear like the bell housing)

          The sound kind of reminds me of the timing gear noise from a Ford 300 big six.

          Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
          rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

          Originally posted by gadget73
          ... and it should all work like magic and unicorns and stuff.

          Originally posted by dmccaig
          Overhead, some poor bastards are flying in airplanes.

          Comment


            Originally posted by sly View Post
            Sounds like every lopo/truck engine I've ever dealt with. I say run it. It should quiet down a little as things seat in. That may take several thousand miles though. Also, it could just be the timing chain initial wear in. Is the sound louder at the front of the engine than the rear? (Mechanic stethoscope would help with this - poke the timing cover behind the water pump on the driver side (nice clear access point away from moving bits) and then poke somewhere in the rear like the bell housing)

            The sound kind of reminds me of the timing gear noise from a Ford 300 big six.
            Timing chain has about 7000 miles on it, done in 2019 so I reused it.
            Noise might be coming more from the front, hard to say by ear. Probably should get my hands on a stethoscope, tire iron hasn't worked much better than without anything.
            1985 Mercury Grand Marquis LS, "Maisa"
            2005 Volvo V70 Bi-Fuel

            Comment


              Then yeah... I got nothing. Yeah, it's louder than some engines for sure, but it also doesn't sound different in tone. Strange.

              Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
              rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

              Originally posted by gadget73
              ... and it should all work like magic and unicorns and stuff.

              Originally posted by dmccaig
              Overhead, some poor bastards are flying in airplanes.

              Comment


                Surprisingly the pass. side manifold-cat flange doesn't seem to be leaking, I can't really feel anything, maybe the slightest hint of a leak. Tried jamming my finger up between the block and manifold, but can't feel anything leaking from there either.
                But the flanges between the Y-pipe and cats are totally blown out already. I had previously slathered the joint with fiber-reinforced exhaust putty, taken it apart, filed the surfaces flat and re-gooped them with gaskets and they've blown out totally in like 20 minutes of runtime. The rearward cat flanges and Y-pipe flanges are garbage and completely shot, honestly everything between the tailpipe and manifolds should be redone. Too bad it's expensive to get it done custom, shipping exhaust parts is ridiculous anyways.

                Prolly going to remove the pass side cat pipe, make sure the manifold flange isn't leaking, goop up and double gasket the y-pipe flange and reinstall. Exhausts suck. And blow.
                1985 Mercury Grand Marquis LS, "Maisa"
                2005 Volvo V70 Bi-Fuel

                Comment


                  Yeah... I had to weld the part between the cats and H pipe of my exhaust up even with new parts. That joint is just crap. As a temporary fix, you could cut the flanges off and use a clamp on exhaust coupler if those are allowed over there.

                  Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                  rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                  Originally posted by gadget73
                  ... and it should all work like magic and unicorns and stuff.

                  Originally posted by dmccaig
                  Overhead, some poor bastards are flying in airplanes.

                  Comment


                    Originally posted by sly View Post
                    Yeah... I had to weld the part between the cats and H pipe of my exhaust up even with new parts. That joint is just crap. As a temporary fix, you could cut the flanges off and use a clamp on exhaust coupler if those are allowed over there.
                    Not a bad idea at all! Though I'll have to measure if there's enough straight section of pipe to be able to slide a clamp coupler on and off the joint, since there's not much back and forth movement in the Y-pipe and tail section.
                    1985 Mercury Grand Marquis LS, "Maisa"
                    2005 Volvo V70 Bi-Fuel

                    Comment


                      Progress! I think?

                      On a cold start the rattle is very quiet, pretty much indistinguishable over the high cold idle noises. As the engine settles to a lower idle and starts warming up, the rattle starts getting louder and louder. I had it running for about 10 minutes, and held up the revs for some time, but it definitely wasn't all the way to normal operating temps. Even so, the rattle is noticeably quieter than previously, as in somewhere around concerning, instead of obnoxious.

                      So what I did to achieve this noticeable change in rattle volume? I changed back to the original motor mounts. The chinesium mounts must've been defective (or just garbage altogether), and transmit a lot of the engine noise into the frame and body, which seem to have functioned as a megaphone to the rattle. The vibrations felt leaning on the fender and sitting in the car are also reduced by quite a bit.

                      A couple things worth mentioning:
                      - Every time the engine has sat long enough to cool down all the way, the lifters clatter loudly for the first few seconds. Seems like they're bleeding down quite fast.
                      - There's sometimes a more persistent tick after startup, it has changed place twice now, so it hasn't been an exhaust leak.
                      - I installed a cheapo mechanical oil pressure gauge for sanity's sake. On 20W-50 the pressure was 60psi on cold start and went down to about 55-56psi after ~15 minutes of running.
                      - Engine seems somewhat shaky and vibrating on idle and on slight throttle, idle exhaust note sounds fine, no popping, plopping or puffing sounds.

                      From these things I've made 2 possible conclusions, shit lifters or poor oil flow to the lifters.
                      - The latter one doesn't have much to back it up, nothing should be impeding oil flow to them and if there were any debris blocking a passage or couple, the rattle should have a slower tempo.
                      - Cold and thick oil probably keeps the lifters quiet for a short while, before it starts getting warm and flows easier.
                      - Still don't know why there wasn't a rattle upon first start and 30 min of running after the engine rebuild.
                      - This causes concern as I do not know if the rattle is coming from the cam and rollers eating eachother or just the plungers not staying pumped up properly.
                      1985 Mercury Grand Marquis LS, "Maisa"
                      2005 Volvo V70 Bi-Fuel

                      Comment


                        Is the factory recommendation 10W30? I understand you have used a heavier oil perhaps for another purpose. Could it be the present oil is too thick to get everywhere and that is the issue?
                        What I Own: 1993 Mercury Grand Marquis GS
                        What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

                        Comment


                          Originally posted by friskyfrankie View Post
                          Is the factory recommendation 10W30? I understand you have used a heavier oil perhaps for another purpose. Could it be the present oil is too thick to get everywhere and that is the issue?
                          The symptoms would almost indicate the opposite, it's quietest when the oil is the thickest.
                          It has 20W50 in it just as a why-not-try and because it was on discount. The rattle was the same with 5W30 previously. Also this is a factory spec Ford small block, hardly a high-precision - low tolerance engine.
                          1985 Mercury Grand Marquis LS, "Maisa"
                          2005 Volvo V70 Bi-Fuel

                          Comment


                            How freely did the lifters move in the bores? If they didn't slide in easily that might be it. If they fall in there like a hot dog in a hallway thats not good either. The oil feed is a drilling that runs through the length of the lifter galley with a hole roughly mid-way up the hole. There is a necked down area in the middle of the lifter where it actually gets oil in, and whatever isn't required for the lifter itself flows around to the next hole down. if the bores are worn out or the lifters are undersized, instead of pumping oil through each lifter it will just piss out around the lifter and some won't pump up correctly.


                            if they sit real tight it may be binding a bit and forcing the oil out instead of just moving the pushrod.
                            86 Lincoln Town Car (Galactica).
                            5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                            91 Lincoln Mark VII LSC grandpa spec white and cranberry

                            1984 Lincoln Continental TurboDiesel - rolls coal

                            Originally posted by phayzer5
                            I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                            Comment


                              Originally posted by gadget73 View Post
                              How freely did the lifters move in the bores? If they didn't slide in easily that might be it. If they fall in there like a hot dog in a hallway thats not good either. The oil feed is a drilling that runs through the length of the lifter galley with a hole roughly mid-way up the hole. There is a necked down area in the middle of the lifter where it actually gets oil in, and whatever isn't required for the lifter itself flows around to the next hole down. if the bores are worn out or the lifters are undersized, instead of pumping oil through each lifter it will just piss out around the lifter and some won't pump up correctly.


                              if they sit real tight it may be binding a bit and forcing the oil out instead of just moving the pushrod.
                              They sit very nicely in their bores, and seemed to move appropriately when oiled up. When I had it apart again, I inspected all the lifters and rollers, no marring or scoring on the sides of the lifters, some tiny marks of debris on a couple rollers.
                              Same thing pre-rebuild, the original flat tappet lifters had barely any wear marks on the sides and the bores looked good and clean, so they weren't even touched up.
                              1985 Mercury Grand Marquis LS, "Maisa"
                              2005 Volvo V70 Bi-Fuel

                              Comment


                                I have formed a theory.

                                Symptoms:
                                - Loud valvetrain clatter for a few seconds after startup
                                - Sometimes a more persistent tick after start
                                - A uniform rattle starts after a running for a while (maybe a minute or two)
                                - Running rough / shaky on idle when warm / starting to warm up

                                Hypothesis:
                                Lifters are not staying pumped up / not holding pressure. This would cause the plungers to bottom out when the cam pushes up on the lifter.
                                Lifters bottoming out would be the rattle I'm hearing, since oil pressure keeps any slop out, the rattle is more solid and isn't the tinny clatter normally associated with lifter problems.
                                With 20W50, the oil might be so thick on a cold start that it resists flowing out of the lifters, barely preventing them from bottoming out or atleast softening it, reducing the volume of the rattle.
                                That might also explain why the rattle doesn't disappear with slight throttle, but actually needs quite a bit of RPM to quiet down (unless its just getting drowned out).
                                If the lifters are bottoming out, it would also severely affect the amount the valves are actually opening, and possibly causing rougher running. Would also make sense that the engine runs smoother before the rattle starts.

                                So, are my cheap EngineTech lifters all junk or did I somehow manage to lodge debris in the check valves of every single one of my lifters?
                                Last edited by Arquemann; 06-18-2024, 03:37 PM. Reason: kebab roll
                                1985 Mercury Grand Marquis LS, "Maisa"
                                2005 Volvo V70 Bi-Fuel

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