Mtx timing belt tensioner bolt size?

Discussion in 'Gen 1 & 2 - Emergency Issues - Help & Maintenance' started by DavidT, Nov 10, 2019 at 5:48 PM.

  1. DavidT

    DavidT SHO Member

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    I am putting everything back together and the timing belt tensioner bolt will start to tighten, then it gets loose. I don’t know if it is the threads on the block, or if it’s an odd bolt from the PO. The head is 16 mm. The front end tutorial I am following says it’s a 14mm??
    I suppose I can run to Lowes ... anyone know the proper bolt size?
     
  2. luigisho

    luigisho SHO Member

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    Can you remove the bolt and check the length and threads? If it was in there before it might be at least close. I don't have that bolt spec. I thought I saw some fastener specs a long long time ago but i can't find it. Probably, well..maybe in a Ford schematic. I would look there and consider dropping shosource or shonut an email and see if they have it on file somewhere. You also should check all the bolt threads for deform/galling.

    I hope the threaded hole is still good. Otherwise you have another step or two to clean the threads or cut new ones. Yuk. This is how we all learn how to do things we didn't really want to know.
     
  3. DavidT

    DavidT SHO Member

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    129D6169-2E3B-4B0D-A999-9723D47B07DE.jpeg 737640A7-1C69-422B-BBC8-27F1E869052F.jpeg 54F0697A-BF7D-4959-9AC5-C46D056F1034.jpeg The threads look decent. I went to Home Depot and found what I thought was a match : m12-1.75. The new bolt and the existing bolt threaded into the same sized nut...but when I got home the new bolt is too big for the pulley AND the block. Ugh
    I’m pretty sure the female threads need repair...
     
    Last edited: Nov 10, 2019 at 8:05 PM
  4. luigisho

    luigisho SHO Member

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    I hope not. Hit up shosource and see what info they have. Local ford dealer should have that in a diagram.Usually has the bolt size info if it's on the schematic
     
  5. DavidT

    DavidT SHO Member

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    It apparently is a random bolt by whoever touched it before me. The bolt must be 7/16”. I thought it was m12. If so, the female threads are probably shot. Also, I called the ford dealership. They said it looks like it is a threaded stud with a nut on the end. Discontinued obviously.
     
  6. DavidT

    DavidT SHO Member

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    Seeing how I’m in WAY over my head... what are the odds, that AFTER the helicoil attempt by myself, which will be my first time ever doing it, the car is never again driveable?
     
  7. luigisho

    luigisho SHO Member

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    Well is the bolt original? This sounds weird. Not the bad threads part, that happens. You may be able to chase the threads and clean them up before going helicoil. When I did my first helicoil on the valve covers it turned out ok so don't worry too much. You can always get a pro if you're too apprehensive.

    If I could do it, you can do it. I wasn't born to wrench. I was poor and had to figure it out. That's how I learned most mechanical things. No you tube back then either. You can get a good look and idea online.

    If you are not sure that is the original bolt, try Dan Barbush--SvHoDan- and see if he has some parts laying around. You could luck out and get a used bolt for cheap. I would also still consider emailing shosource and Josh at shonutperformance. They have alot more parts and time experience and there is a good chance that item, or its specs, are laying around. Couldn't hurt.

    Also, try sending a private message or it's called- start a conversation- with Chad-- Irish Pride maybe he has a way to reference that part or the specs for replacement. Just spitballing for people who may have info available
     
    Last edited: Nov 11, 2019 at 3:44 PM
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  8. luigisho

    luigisho SHO Member

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    The odds are superb. You can't really mess it up unless there is a flared boss that breaks off or some sort of chunk comes out. Helicoils are thin wire and you can always hog it out again and go up in size.. as long as there is room in that area. You should think positive. A bunch of chuckleheads (self included) have done this somewhere along the line so you should be ok.
     
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  9. DavidT

    DavidT SHO Member

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    Yes! I already pmd Dan. I went out and bought a very hard to find in stock 7/16 helicoil. Got home and I can’t fit my small drill/driver in the area to begin the helicoil process. So...
    I stuck a brand new 7/16 bolt in there. Got it snug. It’s not 40 ft lbs snug, but it’s more than likely the way it was before I touched the front end. So I’m thinking of putting it back together and see how it goes.
     
  10. luigisho

    luigisho SHO Member

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    I'm not sure that is the original size or if it is not. Do you think that it will hold? I would hate to do it twice.
     
  11. DavidT

    DavidT SHO Member

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    I think it might. What’s scary is this is a one owner car before me. The seller gave me a folder FULL of receipts for everything done. He had a lot of the 60k done at a service center and not at the dealership. Goes to SHOw that there is NO telling what joe blow mechanic is doing to your car.
     
  12. luigisho

    luigisho SHO Member

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    True but at this age the chance of anything failing is in play. Overtorque/cross threading happens plenty too. I hope it holds. If not you can repair it yourself. I think I did all the helicoil stuff mostly by hand IIRC. Haven't done one in 10+yrs.
     

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