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Thread: 3.9 - New head bolts?

  1. 5th June 2011, 10:00 AM #1
    paulcnb
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    3.9 - New head bolts?

    Hi,
    I am rebuilding a 3.9 Disco engine with an "A" suffix engine number. The heads are the 10-bolt type. My workshop manual says to purchase new bolts for engines with a "B" suffix, but it does not seem to recommend the same for "A" suffix engines.

    Would I be wise to buy a new set of head bolts anyway - or is it safe to clean and re-use the bolts I removed from the heads? Your advice would be appreicated.
    Regards,
    Paul
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  2. 8th June 2011, 05:22 PM #2
    Traco
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    If it's got stretch type (which if it's a 3.9 it should have) I recommend you ditch them and fit Rover SD1 non stretch type or ARP stud kit.

    Not a good idea to re-use stretch bolts and some engine gurus firmly believe they contribute to the notorious block cracking/ slipped liner syndrome (in fact Mark Adams is convinced they are the main cause).
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  3. 8th June 2011, 10:14 PM #3
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
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    to tell if you have the stretch bolts....

    have a look at the bolt. just under the head will be a small lip, then it will be machined down for a lenght of the shank before stepping up to the original size with the thread cut in it.

    they are stretch bolts and as far as holding heads down is concerned are one use only.
    Dave

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  4. 9th June 2011, 07:06 AM #4
    paulcnb
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    Thanks Gents - very helpful. The bolts do have the machined shank, so I will buy a set of new bolts and bin these.
    Regards,
    Paul
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  5. 9th June 2011, 08:00 AM #5
    Blknight.aus's Avatar
    Blknight.aus
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    keep some of them for use when you dummy fit stuff or for use as drifts and the like just put a good slice through the head so you cant mistake them for unused bolts.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  6. 9th June 2011, 10:07 AM #6
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    clubagreenie
    clubagreenie is offline TopicToaster
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    Please buy studs, please buy studs, please buy studs...
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