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Thread: BJ7 heater blower vibration

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    Jedi Warrior
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    BJ7 heater blower vibration

    My heater blower does seem to cause some vibration. The one thing different about mine is that I changed out the motor for an AC Delco which runs nicely. Does anyone notice a vibration with the engine off and the blower on? I can feel in on the fender. I can see the squirrel cage and it seems to run true. Spinning too fast maybe?

    Dl
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Yoda steveg's Avatar
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    Re: BJ7 heater blower vibration

    The blower unit is mounted with rubber grommets as vibration isolators. If they're shot, that could be the problem. (Note use of 1/4-20 u-nuts on feet for ease of removal/replacement of unit.)

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    Steve Gerow
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    Jedi Warrior
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    Re: BJ7 heater blower vibration

    I'll take a close look at the mounts tonight. Thanks Steve.
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Jedi Knight Healey Nut's Avatar
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    Re: BJ7 heater blower vibration

    The blower wheel may have lost its balance weight clip . Look for a clean spot on one of the blades where it was . If it had one it would be a small piece of spring steel similar to the fender screw clips but much smaller .
    "If it aint broke ....dont fix it "
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    Re: BJ7 heater blower vibration

    Steve, the mounts are in good shape. couple years old.
    Dale
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Jedi Warrior
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    Re: BJ7 heater blower vibration

    Healey Nut, how are things in the north? I think we have some of your weather this week.

    No balance weights at all.
    Dale
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Obi Wan RAC68's Avatar
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    Re: BJ7 heater blower vibration

    Hi Dale,

    I also changed the motor of in my heater blower, quite a while ago, with one out of an wrecked late 1960s Oldsmobile Starfire Convertible. With the original motor, I could breath heavier then the air coming through the defroster vent. Since the Olds installation, my defrosters move so much air that they whistle, even with the heater vents open.

    When you changed the motor, did you install the squirrel cage on its shaft? If so, how? Depending on how you positioned the motor and squirrel cage, you may be rubbing the inside of the surround. When I installed the Olds electric motor, I could not just replace the motor but needed to create an adapter out of a piece of metal to allow movement for correct placement of the squirrel cage within the surround.

    One installed and after validating its operation, I trimmed and painted the full unit and now you can't tell there is a optical difference.

    Hope this helps,
    Ray(64BJ8P1)

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    Re: BJ7 heater blower vibration

    Yes Ray, I installed the original squirrel cage. I had to turn down the motor shaft slightly but it fit. It's not hitting anyplace.

    I'll observe it running with these things in mind.
    Dale
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Re: BJ7 heater blower vibration

    I googled how to balance a fan cage. Not much for cars but HVAC had some good stuff. My fan motor is tight so the cage doesn't move easily enough to balance on the bench. I did test it by turning it off and on and watching it just before it stops to see if there is any wobble. It's hard to see but there is some slight movement showing its not 100% true. That's probably causing the vibration. Now I have to decide if I can live with it or take it apart.
    Dale
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Obi Wan RAC68's Avatar
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    Re: BJ7 heater blower vibration

    Hi Dale,

    You might as well start taking the unit appart as you will keep thinking about the imbalance every time you turn the bolwer on and it will agrivate you. However, if you use the blower as often a I do (almost never), then living with the issue will not be as much as a problem.

    I am in the same situation with my having something lose banging when I have a low rough idle. Disassembling carburetors, intake and exhaust manifolds to install new engine mount rubber is not something I will consider as long as the banging keeps disapearing at higher RPMs or when running (even at slow speeds on rough roads). In my opinion, the issue is not that improtant or agrivating to equal the effort and risk of creating new issues when taking everything apart.

    So, can you live with the vibration the few times you will activate the blower?

    Ray(64BJ8P1)
    Last edited by RAC68; 11-14-2019 at 02:51 PM.

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    Re: BJ7 heater blower vibration

    Ray, you convinced me. It's coming apart this weekend. It's better to do now than later when the motor bearing wears out prematurely. I'm not exactly getting more physically flexible as time passes either.
    Dale
    Dale

    BJ7 frame up restoration of "the car that would not be restored"; began Dec. 2005, est. complete 2023

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    Luke Skywalker
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    Re: BJ7 heater blower vibration

    (not exactly getting more physically flexible as time passes either.)

    Join the club

    It comes with old age don't you know. I am contemplating a rear end (trunk floor on my BJ7) re build before I seize up completely.



    Bob

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