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Thread: Motor mount replacements

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  1. #1
    Yoda steveg's Avatar
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    Motor mount replacements

    I replaced mine with AHspares', which are supposedly made out of heavier material. Fitting the 4-bolt bases without cross-threading is a fiddle. There are some shims underneath. I reused my original rubbers as they are still good.

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    Steve Gerow
    Altadena, CA, USA
    1959 AH BN6 2-seat roadster / 1974 TR6 Emerald Green
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  2. #2
    Jedi Knight Lin's Avatar
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    Re: Motor mount replacements

    I am not in any hurry to do it, but I suppose I really should change out the motor mounts. I do have some delamination of the metal and rubber surfaces on my original motor mounts. The problem is that I have yet to hear a single person write or say I purchased and installed motor mounts that I ordered from _____ and they fit perfectly.

    I sure would like to hear from someone who had a good experience and procured high quality motor mounts. Anyone?

    Lin Rose
    1959 AN5 Bugeye - now with my son 😀
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  3. #3
    Obi Wan RAC68's Avatar
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    Re: Motor mount replacements

    Lin,
    I appreciate you would like to replace your mounts due to some metal/rubber delamination but since the mount supports the engine through compression, has your mount posed a problem?

    Steve,
    How do you tell that a motor mount rubber is deformed through compression? As you know, I have had a banging sound during rough idling and a few Healey friends both verified that the sound is not comming from inside the engine and suggested it was due from the sinking of the top rubber on the left side engine mount. My plan was to follow your suggestion to insert 1/4" (2-1/8") aluminum shims under the base of the mount. However, due to difficulty in loosen the mounting bolts, this plan was changed to a winter project where the carbs, intake and exhaust manifold would be removed and the motor mounts could be more easily accessed to replace the deformed top rubber with new.

    Recently, I had loaded a new app on my phone that could measure level and angle (degrees). Placing my phone on flat portions of the engine head, my engine appears to be level from side to side and less then 1-deg. from front to back. My initial thought was that my engine is not tipped lower on the left (driver's) side and, therefore, the reason for shims or new rubber would be a waist of what would be a significant effort.

    So, is my initial suspicion correct. Is there a better way to evaluate/verify the compression of the mount rubber without pulling the mount? If my initial conclusion is valid, I will then continue looking for the mysterious loose-metal irregular banging that appears during rough idling but is NOT heard when driving slowly on rough roads.

    Any suggestions would be appreciated as everything, so far, seems tight and solid nothing loose.
    Ray(64BJ8P1)

  4. #4
    Jedi Knight Lin's Avatar
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    Re: Motor mount replacements

    Ray,
    No I have not experienced a problem - at least of which I am aware.
    Lin
    1959 AN5 Bugeye - now with my son 😀
    1960 BT7 3000 MKI
    1987 Alfa Romeo Spider Quadrifoglio
    https://valvechatter.com/

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