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Thread: Timing chain tensioner spring

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    Timing chain tensioner spring

    I am confused. I've had 2 springs break and now looking thru Victoria British & Moss catalogs it appears that the TR-4 spring is different from the TR-250 spring. Is this correct. The last broken spring I took out appears to be a TR-250 spring.

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    Luke Skywalker Alan_Myers's Avatar
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    Re: Timing chain tensioner spring

    Hi,

    I can't be certain, but I'd assume a timing chain tensioner for 6-cylinder TR is different from the 4-cylinder.

    Possible causes of tensioner breakage that I can think of:
    - Poor quality spring (don't use the black ones)
    - Groove worn under tensioner
    - Worn out & sloppy timing chain
    - Poor quality timing chain
    - Worn timing gears
    - Misaligned timing gears
    - Misaligned or bent spring pivot pin
    - Lack of lubrication

    In addition to those you are using, here are some other parts sources that might help:
    The Roadster Factory www.the-roadster-factory.com/
    British Frame & Engine www.britishframeandengine.com/

    I hope this helps!

    Alan Myers
    San Jose, Calif.
    '62 TR4 CT17602L
    Alan Myers
    San Jose, CA
    '62 TR4 CT17602L

    "Get in. Sit down. Shut up. Hang on."

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    Yoda martx-5's Avatar
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    Re: Timing chain tensioner spring

    Yes, Moss Motors shows different part numbers for the TR4 and TR250 tensioners. As a matter of fact, there are two different ones for the TR250.
    Art
    '58 TR3A TS236xxL
    '92 Mazda Miata -- Supercharged
    '07 Mazda RX-8
    '11 Mazda CX-7

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