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Inspection Cylinder Compression

Discussion in 'Engine' started by navylife59, May 15, 2008.

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  1. navylife59

    navylife59 Super Moderator Staff Member

    Mar 22, 2006
    Emory, Texas or Gretna, LA
    (a) Warm up and stop the engine.
    (b) Remove the No. 1 engine cover (see page EM-22).
    (c) Remove the 4 ignition coils (see page IG-9).
    (d) Remove the 4 spark plugs.
    (e) Disconnect the 4 fuel injector connectors.
    (f) Set SST and a compression gauge.
    SST 09992-00500
    (g) Insert the compression gauge into the spark plug
    (h) While cranking the engine, measure the
    compression pressure.
    Standard compression pressure:
    1,300 kPa (13.3 kgf/cm2, 189 psi)
    Minimum pressure:
    1,000 kPa (10.2 kgf/cm2, 145 psi)
    Standard difference between each cylinder:
    100 kPa (1.0 kgf/cm2, 14 psi)
    • Always use a fully charged battery to obtain
    an engine speed of 250 rpm or more.
    • Check the other cylinders' compression
    pressures in the same way.
    • This measurement must be done as quickly
    as possible.
    If the cylinder compression is low, pour a small
    amount of engine oil into the cylinder through the
    spark plug hole and inspect again.
    • If adding oil increases the compression, the
    piston rings and/or cylinder bore may be worn or
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