Thread: Question about filling motor/trans mounts.

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  1. #1 Question about filling motor/trans mounts. 
    GTP Level Member nik12937's Avatar
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    So while I had my subframe lowered to get into my transmission (thanks again for writing that guide Bill), I saw my motor mount has finally started to leak and sag a little. I have some new hydraulic mounts that I drilled a while back and forgot about, and now is about time I filled them.

    I originally was going to fill them with that window weld stuff like I've seen in a thread before, but it's supposed to cure to a shore rating (hardness) similar to polyurethane mounts. I'd rather fill them with something closer to the rubber the mount is made of though so they still have some give.

    Does anyone know what could be used to achieve this? I'm almost thinking black RTV would work, but I'm not sure what shore number I'd really want to aim for.

    And how long should I let them cure? Some threads on other forums have said 24 hours is enough, but I've also seen some people say up to a month.
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  2. #2 Re: Question about filling motor/trans mounts. 
    GXP Level Member Turbocharged400sbc's Avatar
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    The window weld takes a couple weeks and the rtv takes a few months
    if neither is fully cured then you end up with a spaghetti maker when you put the motor down on it
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  3. #3 Re: Question about filling motor/trans mounts. 
    GTP Level Member nik12937's Avatar
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    Wow, that's a long time to wait for a mount. I'll just have to bite the bullet and wait until summer to put them in. I don't want to take a chance of having vibrations when I'm stuck in traffic, the blown mount is already bothering me a little.
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  4. #4 Re: Question about filling motor/trans mounts. 
    GXP Level Member Turbocharged400sbc's Avatar
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    *****
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  5. #5 Re: Question about filling motor/trans mounts. 
    I live here. Slick2500's Avatar
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    I don't know how good the quality of them are but Partsgeek has solid engine mounts for ~$30.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
    Quote Originally Posted by The Sunfire Guy
    Superchargers take away horsepower
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  6. #6 Re: Question about filling motor/trans mounts. 
    GXP Level Member Turbocharged400sbc's Avatar
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    No "solid" mounts are solid...they are hollow with air instead of oil/ water...so they collapse fast as ****.
    there really isn't much difference between RTV and the urethane
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  7. #7 Re: Question about filling motor/trans mounts. 
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    i had a zzp solid trans mount and ripped it in half in less than 1000miles
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  8. #8 Re: Question about filling motor/trans mounts. 
    GXP Level Member Turbocharged400sbc's Avatar
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    ...and I've had brand new ones collapse and settle onto the cross pin.....now that will give you a vibration to complain about....
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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