1. dibbons

    dibbons FABO Gold Member FABO Gold Member

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    Removed all the oil pan bolts. In the process, I found one loose which was located in the center of the oil pan area. When I got ready to clean them up, I also found one was longer than the all the others (photo #1). I don't know if the longer one was the loose one or not. I do know, the longer one was NOT used in the front (timing cover-photo #2) or the rear (where the bolts can go all the way through the block without bottoming out-photo #3). Machine shop responsible for assembly sold out some years ago so I cannot go back to question anyone there.

    My question is: did the factory install two different length bolts in the early LA motors, or if all the oil pan bolts were the same length? Thank you.

    oilpan bolt 1.JPG

    oil pan bolt 3.JPG

    oil pan bolt 2.JPG
     
  2. RammerJammer75

    RammerJammer75 Well-Known Member

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    I'm not sure if they did, but all of those bolts look different. Almost like somebody just found bolts to work just to get the pan on.
     
  3. MOPAR4Me

    MOPAR4Me FABO Gold Member FABO Gold Member

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    If I recall correctly, the two mating with the timing cover are longer. Makes sense as it is a through hole instead of blind, and more importantly it is to the softer aluminum cover.
     
  4. Oldmanmopar

    Oldmanmopar Going left turning right FABO Gold Member

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    I see three OEM pan bolts in your picture. The other bolts throw away. There is two longer bolts that go into the aluminum timing cover. But none of them that you have pictured.

    Do yourself a favor and run a tap in the holes. Also clean the bolts. run a die on them soak them in pure Super clean overnight and rinse.
     
  5. Demonracer

    Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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    Yep, bolts 1,2 & 4 are correct, put the others in your spare bolt can. As OMM said, run a tap in the holes & a die on bolts, soak the to get rid of all the junk & then reinstall.
     
  6. dibbons

    dibbons FABO Gold Member FABO Gold Member

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    Just noticed my valve covers have 5 long and 5 shorter fasteners. Either size seems to work, just can't find any consistency with this rebuilt motor.

    valve cover bolts.JPG
     
  7. jau126

    jau126 '65 Dart GT 273 904

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    I think the short ones are correct for the valve covers. I was just working on the intake over the weekend so they were out. (Pretty original car with the motor never out or apart except under my ownership.)
    They could have mixed them up.
     
  8. dibbons

    dibbons FABO Gold Member FABO Gold Member

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    If the short ones are correct, the long ones have no application being the fact the oil pan bolts are a larger diameter (or vise versa). Just thinking aloud.
     
  9. Demonracer

    Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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    Some rebuilders are famous for using whatever bolts they have if they fit. LOL
     
    • Agree Agree x 2
    • jau126

      jau126 '65 Dart GT 273 904

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      Larger Diameter? What are the threads then?

      They also look like they were blue at some point. Not sure if your entire motor was blue like a 318 or something...?
       
    • dibbons

      dibbons FABO Gold Member FABO Gold Member

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      Mopar small block bolt Diameter Chart (use at your own risk). For example, I have seen 340 head bolt torque listings as 95 ft-lb. And as for tightening oil pan bolts to 15 ft-lb, I have my doubts after having seen the gasket just want to squeeze itself out of place the tighter one goes.

      bolt sizes.jpg
       
    • jau126

      jau126 '65 Dart GT 273 904

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      Not to be a captain obvious but just check the diameter then. I think my valve cover bolts are 5/16-18. Granted that is a wacky '65. On the other hand the factory service manual as a typo to crank the intake manifold bolts to 270 ft lbs in the assembly section. I am not sure they proofed it carefully before published.
       
    • dibbons

      dibbons FABO Gold Member FABO Gold Member

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      It's obvious to the naked eye the tiny valve cover bolts (cylinder head cover bolts) don't compare with the oil pan bolts.
       
    • jau126

      jau126 '65 Dart GT 273 904

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      Your right. My bad.
      Then I guess put the 1/4-20 bolts in the cylinder head cover and the 5/16-18 in the the oil pan. They should not be able to be used in either location unless they re drilled and tapped some of the holes. Which at this point seems possible if they did't know what was what to begin with.
       
    • jau126

      jau126 '65 Dart GT 273 904

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      You can also check the threads minor diameter of the hole with some dial calipers. For the 1/4-20 you should be between 0.1960 and 0.2070 (on the inside of the threads). 5/16-18 you should be between .2520 and 0.2650
       
    • dibbons

      dibbons FABO Gold Member FABO Gold Member

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      I was just commenting on the lack of conformity with respect to the valve cover bolt "length" I found, not trying to relate them to other applications. Par for the course anytime a factory vehicle/motor has been torn down even once before.
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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      oilpan-bolt-1-jpg.jpg
      Oil-pan and valve cover bolts have the first couple of threads missing, making them easier to start, so the first 4 are good candidates.
      All the non-corner, 1/4-20 bolts retaining your oilpan should be identical;and they all go into blind holes. I have never seen it otherwise.
      The corner bolts, as mentioned, are different.
       
    • dibbons

      dibbons FABO Gold Member FABO Gold Member

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      Just to finalize this and prevent any misunderstandings for future readers of this post; the 18 oil pan fasteners (photo left) are 5/16" and the 10 valve cover fasteners (photo right) are 1/4" diameters. The length may vary (ha-ha) depending on what clown(s) has worked on the engine previously.

      bolt 5:16 vs 1:4.JPG
       
      Last edited: Sep 10, 2020
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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      Alex; I'd like to call a friend
      It's been 15 years since I last screwed my 360 together..... but I wouldda thought that I wouldna not forgot that. Maybe that's why my wife sleeps in her own bed.
       
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