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Thread: Low Compression

  1. #1

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    Low Compression

    I have a 2004 NA 4-Tec that has developed low compression after water ingestion (Less than 90 PSI). I quickly emptied the machine after flooding and flushed the engine internally within 24 hours, changed the oil 4-5 times and pickled the engine with ATF. After clearing the oil and replacing the filter and plugs the engine would not start although you could hear it trying to fire. All cylinders have good spark. I then had the compression checked by a Sea-Doo shop and found all cylinders low on compression. I have since had the head removed and found the valves and tops of pistons to be in good shape visually without removing them. Any thoughts from someone on what could be creating the low compression? The machine is very low time for a 2004, 150 hrs.

    Thank You,
    HoverRL


  2. #2

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    All cylinders low?
    What was reading exactly on all 3?

    After water ingestion.. it is normally tough to fire up for the first time .

  3. #3

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    Below 60 with # 3 being 90

  4. #4

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    ah alright.. .y
    if you were to say 90-90-90 i would have said maybe their gauge was no good or similar...
    Did you take head off or anything?
    60s super low...

  5. #5
    Boost addict hotbird's Avatar
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    Did the motor hydrolock?

  6. #6

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    bent rods? timing off?

  7. #7
    If you have a Snap on test tool You can pressurize the cyl to see where the air leaks from. Take the strader valve out of the test tool adapter... and hook a air hose (100 Psi) to end of the test tool while it is install into the engine spark plug hole..... It will roll the piston down & close the valves. You can then determine what is leaking???? Intake Valves? Exhaust valves? or Rings. This would be your pressure test on the engine.

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