Reply To: QD 21 Head bolts?

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July 10, 2022 at 7:49 pm #262775
Bob Wight
Participant

    US Member
    Don wrote:

    Not sure what year a QD21 is? But, if it is older than 1961, it may have worn wrist pin bushings/rods allowing the pistons to travel higher and hit the plugs/close up the gaps. Check for writ pin slop.

    Good suggestion on the wrist pin / bushing wear – the QD21 is a 1960 model.

    Bob

    1937 Champion D2C Deluxe Lite Twin
    1954 Johnson CD-11
    1955 Johnson QD-16
    1957 Evinrude Fastwin 18
    1957 Evinrude 3022
    1958 Johnson QD-19
    1958 Johnson FD-12
    1959 Johnson QD-20
    1982 Evinrude 25hp

    “Every 20 minute job is only a broken bolt away from a 3-day project.”
    "Every time you remove a broken or seized bolt an angel gets his wings."