Reply To: Compression

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August 20, 2021 at 12:13 am #245208
Bob Wight
Participant

    US Member

    A correction to my previous post after looking back thru restoration notes – I had initial tests of 80-85 psi on my 10hp Johnsons. After replacing the head gaskets and getting some running time on them, I ended up around 90 – 92 psi on both.

    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."