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3.9 Bottom end

Discussion in 'It's A V8 Mate!!' started by Jackstar, Feb 23, 2021.

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  1. Jackstar

    Jackstar Member Full Member

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    Hi all, I've looking to replace my big end and main shells on my 3.9 and I'm sure that the con rod bolts needs replacing is it the same case for the mains bolts?

    Also there seems to be two types of con rod fixings, bolt or studs and nuts, do the stud and nut version also need replacing?
    Im yet to strip mine down to see what type I've got
     
  2. discool

    discool Well-Known Member

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    A workshop manual will state if the bolts require replacing.
    All of the disco 1 V8s con rod caps are retained by nuts and bolts, 602061& 602609 .The 3.5 ranges just had a bolt only AUU2038L
    I don't have any info on the 3.9 RR, as I went for the 3.9 disco:)
     
  3. Jackstar

    Jackstar Member Full Member

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    I should have said mine is a 1996 disco.
    So I'll need to replace the nuts and studs, I'll look for the torque sequence for these.

    Where's best to get the fixing from for the con rods and mains?

    Thanks
     
  4. discool

    discool Well-Known Member

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    The torque setting for big end bearing bolts is 51Nm or 38 lbf ft
    The bolt part no. 602609 is not for serp belted engines ie up to 1994 only according to island, but Rimmer’s state whats in my parts catalogue thats just the one bolt.
    So could be another part no. to find if you have a serpentine engine.
    https://www.island-4x4.co.uk/bolt-7094-602609-p-15582.html
    https://www.island-4x4.co.uk/special-602061-p-15578.html
    https://rimmerbros.com/Item--i-602609
    https://rimmerbros.com/images/pdfs/discovery.pdf
     

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  5. Henry_b

    Henry_b ̿̿ ̿ ̿'̿'\̵͇̿̿\з= ( ▀ ͜͞ʖ▀) =ε/̵͇̿̿/’̿’̿ ̿ ̿̿

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    Its Full of WIN.....
    You should be good.

    No need to replace them unless they snap, or the threads are damaged "for whatever reason"..
     
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  6. Jackstar

    Jackstar Member Full Member

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    I'm having 2nd thoughts on it being rod bearings now, I've got a knocking noise when the engine is up to temp,sounds worse when under the car than from above it also sounds sweet from cold, the knocking goes at 3000rpm and above, and the coolant overflow bottle is overflowing.

    Am I right in thinking these are all symptoms of a slipping liner?
     
  7. v8250

    v8250 Well-Known Member

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    Slipping liner? Yes, they can sound like this. Might be worth having chat with Richard at Turner Engineering re' fault diagnosis + the correct components for the 3.9 RR engine, though there's nothing complex with the rebuild. Do you have an engineer's stethoscope? They are superb at accurately pinning down the location of a fault and you should be able to listen to which cylinder/s the noise is coming from.
     
  8. Jackstar

    Jackstar Member Full Member

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    I've brought a good condition block to fit my heads to, I'll strip and a fault find the original block later, probably rebuild if it's useable.
     
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