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Thread: Pressure testing a TR6 Heater core

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    Pressure testing a TR6 Heater core

    Hi,

    Does anyone know what pressure to test for leaks on a TR6 heater core?

    Thanks,
    Daniel
    Daniel Marquette
    1973 TR6

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    Obi Wan TR6oldtimer's Avatar
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    Re: Pressure testing a TR6 Heater core

    The cooling system is pressurized to 13 lbs. That said, I took my core to a local shop who boiled, pressure tested, and inspected the unit for $20. What a deal.

    An aside note. When I asked them about painting the unit, they strongly recommended against it since you cannot get all the surfaces painted. In their opinion, all you accomplish is painting the outside and leaving over spray on the inside to capture dust and dirt.

    Ray
    Ray

    A man is not old until regrets take the place of dreams.
    1973 TR6 sort of Mallard Blue in restoration

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    Re: Pressure testing a TR6 Heater core

    2 saw bucks is a deal. If you aren't in the market for a new heater core, try this avenue. However, I am of the opinion that if you have the heater out on a TR6, then by darn, change everything for new, you DON'T want to repeat that chore. You will kick yourself if something fails next month.

    I just redid my heater and I replaced everything but the rheostat resistor bar for the fan speed. I was told my someone in great authority (Dave at TRF) that he has never seen one of these buggers go out. He said they almost never, or even never, sell one.

    Mine went out.

    I performed arthroscopic surgery on my heater in situ. I used some dental tools to snip the wires off the bar and ran a new wire direct to the high end of the bar and simply bypassed the rheostat. I only operate on high speed. But have you ever seen a TR6 heater that was worth anything on low speed?

    Have I talked you into buying a new heater core yet?

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    Re: Pressure testing a TR6 Heater core

    Ray & Bill,

    Thanks. Has anyone ever tried rebuilding their core at home using TRF components?
    Daniel Marquette
    1973 TR6

  5. #5
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    Re: Pressure testing a TR6 Heater core

    Daniel, I'm not quite sure what you mean, using TRF components.
    To my knowledge, The Roadster Factory, nor anyone else sells components for the heater core. At least this is what it sounds like you are saying. TRF does well new heater cores, which I bought one and installed.

    Are you referring to the whole heater unit as a heater core?
    The heater core is the little radiator inside the unit.

    The only parts not currently available are new fans. I found one on ebay some time back.

    Are we on the same page?

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    Re: Pressure testing a TR6 Heater core

    Bill,

    I was referring to the entire unit as the heater core. Thanks for the correction. I had seen where TRF was selling new fans and heater cores for at home rebuilds.

    Anyway, I just bench tested my unit with 12V and I couldn't get the fan working...until I gave the fan blade a little help getting started by giving it a slight twirl. And this was at full voltage. It wouldn't even turn on the lower voltage wire.

    I guess the wisest thing to do would be to replace the entire unit and KNOW it is good.

    As always,

    Thanks for your advice!

    Daniel
    Daniel Marquette
    1973 TR6

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    Re: Pressure testing a TR6 Heater core

    I bought a new TRF heater motor, which I had installed in my TR6 when the tranny was out this spring. My original was seized. Since then, I've located two very nice complete heater assemblies on ebay, which I am preparing to disassemble and rebuild. I just ordered the new grommet packages from TRF and will take the cases to be powder coated when they're all apart.

    The cores will go to a local shop to be cleaned and recored. The motors seems to be fine, but will go to my buddies at Yankee Auto Electric for disassembly and testing.

    The resistor is the only item not available at this time. I may take a spare two speed switch along with the motor to see if they can find me a switch that will have the same style shaft, or interchange them, so that I can get a variable switch that does not rely on the resistor.

    For the most part, Lucas electrical parts get a bad rap, but putting a resistor that is prone to failure inside a case that requires dash disassembly to remove is beyond dumb. Smith's heater engineers were sleeping when that design was approved.

    I plan to do a pictorial for those who are planning to do the job. I will not be tearing he car apart at this time, but everyone will see what the heater case and cores are about.
    Paul Rego
    S.E. MASS - USA
    1974 TR6 Mimosa & Chestnut
    Original Owner / Non Original Car
    1980 TR8 Lava Red Pearl / Tan
    New Owner / Non Original Car

    My TR6 Resto-Mod Project

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    Jedi Warrior
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    Re: Pressure testing a TR6 Heater core

    Quote Originally Posted by TR6BILL
    But have you ever seen a TR6 heater that was worth anything on low speed?
    Interesting. The heater on mine is first rate, but I don't know if the core is stock. Yesterday I drove about 100 miles with temps in the low 30s. The heater water valve was barely opened and I used no blower while at speed, turning on the low speed when back in town. It's been that way for the six years I've owned the car. Maybe though, I'm still just happy to be away from the 356C that, when you turned on the heater, all you got was warm air and lots of fumes.
    Paul Johnson

    If there is nothing wrong with your car, I can fix that too.

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    Great Pumpkin Brosky's Avatar
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    Re: Pressure testing a TR6 Heater core

    Having owned several early 60's VW's, that were used as winter "donut cars", I can relate to that remark. My 911 never had those issues. Sigh.......

    I'm sure that the core is stock. No one would ever redesign a case to fit a bigger core, not even TR6 Bill or Kodanja!

    TR6's all had good heaters, as long as you got all of the air out when you drained and refilled the system. Of course doing so almost always stopped the dreaded overheating issues as well.
    Paul Rego
    S.E. MASS - USA
    1974 TR6 Mimosa & Chestnut
    Original Owner / Non Original Car
    1980 TR8 Lava Red Pearl / Tan
    New Owner / Non Original Car

    My TR6 Resto-Mod Project

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    Re: Pressure testing a TR6 Heater core

    Frankly, I don't think a bigger core necessarily translates directly into a more powerful heater. The core in my (long gone, thankfully!) '91 Explorer isn't a whole lot larger than that in my Herald!
    -- Andrew (Andy) Mace, VTR's Triumph 10/Herald/Sports 6 vehicle consultant and keeper of the North American Triumph Sports 6 and Herald Database

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