Taper Seat Spark Plug NGK TR5 Equiv - Bosch HR8DCV+

Description

Bosch HR8DCV+ spark plug. Bosch stock number 79016, trade number 30, part number 0 242 229 737. Nine in stock.

This one has a tapered seat, not a gasket. That is the important bit. A taper seat plug has no washer. It wedges into a matching cone in the head, and it needs far less torque than a gasket plug. The box tells you as much with 15 degrees and 20 Nm, where every gasket seat plug on our shelf says 90 degrees and 28 Nm.

Read the torque before you fit it. The box gives 15 ft lb. Bosch's own published range is 15 to 29 ft lb for a cast iron head but only 8 to 14 for aluminium. So on an alloy head the figure on the box is already above what Bosch recommend. Look up your engine and use that number, not the carton.

Where it goes. The Holden Calais and HSV with the Ecotec V6, and the Chevrolet Impala, roughly 1993 to 2004. Also the Ford Escape and the Ford Fusion 3.0 V6. The NGK number is TR5, which anyone who has worked on a Holden V6 will recognise straight away.

Full specification, from Bosch's own data

  • 14mm thread, 1.25mm pitch, tapered seat
  • 17.5mm reach, 16mm hex, removable nut terminal
  • Gap 1.3mm, .050 inch
  • Nickel centre electrode, 2.5mm, projected
  • Nickel ground electrode, taper cut
  • Resistor type at 6 kilohms, heat range 8
  • Rated around 30,000 miles

Other brands' numbers. NGK TR5, BPR5EFS-13 and BPR6EFS-13. Champion RS12YC, 401, BN12Y, RBN12Y and RZN12Y. Denso T16EPR-U, T20EPR-U, T16TT and the iridium IT16. Motorcraft AWSF32, SP-432 and AGRF32-6. Brisk G17Y and GR17YC. Mazda LFY3-18-110.

Fitment

Whatever calls for Bosch HR8DCV+, Bosch 79016, NGK TR5 or Champion RS12YC. If the head takes a gasket seat plug this one will not seal, so confirm the seat type before ordering.

Fitting

  • Cold engine, one at a time.
  • Taper seats need a clean cone in the head. Anything left in there stops it sealing.
  • Seat it, then a further 15 degrees. That is all.
  • On an alloy head work to 8 to 14 ft lb, not the 15 on the carton.

Best fitted by a qualified mechanic.

Taper Seat Spark Plug NGK TR5 Equiv - Bosch HR8DCV+

Product form

Bosch HR8DCV+ spark plug. Bosch stock number 79016, trade number 30, part number 0 242 229 737. Nine in stock.This... Read more

9 in stock Dispatch in 1–3 business days

$12.90 Incl. VAT

    • Guaranteed secure & safe checkout. NZ owned & operated.

      shop pay
    • Free shipping on orders of $100 or more
    • Consumer Guarantees Act protection on every order

    Description

    Bosch HR8DCV+ spark plug. Bosch stock number 79016, trade number 30, part number 0 242 229 737. Nine in stock.

    This one has a tapered seat, not a gasket. That is the important bit. A taper seat plug has no washer. It wedges into a matching cone in the head, and it needs far less torque than a gasket plug. The box tells you as much with 15 degrees and 20 Nm, where every gasket seat plug on our shelf says 90 degrees and 28 Nm.

    Read the torque before you fit it. The box gives 15 ft lb. Bosch's own published range is 15 to 29 ft lb for a cast iron head but only 8 to 14 for aluminium. So on an alloy head the figure on the box is already above what Bosch recommend. Look up your engine and use that number, not the carton.

    Where it goes. The Holden Calais and HSV with the Ecotec V6, and the Chevrolet Impala, roughly 1993 to 2004. Also the Ford Escape and the Ford Fusion 3.0 V6. The NGK number is TR5, which anyone who has worked on a Holden V6 will recognise straight away.

    Full specification, from Bosch's own data

    • 14mm thread, 1.25mm pitch, tapered seat
    • 17.5mm reach, 16mm hex, removable nut terminal
    • Gap 1.3mm, .050 inch
    • Nickel centre electrode, 2.5mm, projected
    • Nickel ground electrode, taper cut
    • Resistor type at 6 kilohms, heat range 8
    • Rated around 30,000 miles

    Other brands' numbers. NGK TR5, BPR5EFS-13 and BPR6EFS-13. Champion RS12YC, 401, BN12Y, RBN12Y and RZN12Y. Denso T16EPR-U, T20EPR-U, T16TT and the iridium IT16. Motorcraft AWSF32, SP-432 and AGRF32-6. Brisk G17Y and GR17YC. Mazda LFY3-18-110.

    Fitment

    Whatever calls for Bosch HR8DCV+, Bosch 79016, NGK TR5 or Champion RS12YC. If the head takes a gasket seat plug this one will not seal, so confirm the seat type before ordering.

    Fitting

    • Cold engine, one at a time.
    • Taper seats need a clean cone in the head. Anything left in there stops it sealing.
    • Seat it, then a further 15 degrees. That is all.
    • On an alloy head work to 8 to 14 ft lb, not the 15 on the carton.

    Best fitted by a qualified mechanic.

    Returns & Delivery

    When will my order be delivered?

    We ship to New Zealand addresses only, including rural delivery. Orders are
    dispatched within 1–3 business days. Once dispatched, NZ Post usually takes 2–3
    business days to main centres and 3–5 business days to regional and rural areas.
    You'll receive tracking by email once your order is on its way.

    Can I return my product?

    Your rights under the Consumer Guarantees Act 1993 apply to every purchase. If a
    part is faulty, not as described, or not what you ordered, contact us and we'll
    put it right. We don't accept change-of-mind returns, and confirming a part fits
    your vehicle is your responsibility before ordering. See our Refund Policy for
    full detail.

    What can I do if my item (or part of it) is damaged?

    Check your order when it arrives. If anything has arrived damaged, contact us
    with a photo and we'll put it right by repair, replacement or refund. Tell us as
    soon as you reasonably can so we can lodge a claim with NZ Post.

    Recently viewed products

      Footer image

      © 2026 Thebros, Powered by Shopify

        • American Express
        • Apple Pay
        • Google Pay
        • Mastercard
        • Shop Pay
        • Union Pay
        • Visa