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Thread: Leak Down test

  1. #1
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    Leak Down test

    I took my 280 to a dealer to check electrionics, they call me said leak down 18% on three cylinders, 11.5% or more on others. The said motor tired cause it has 215 hours.

    I have about 75 hours on new rings top pinned pistons. My leakdown with Baltz tester following his instructions is 2.5% on 4 cylinders 6% on 1 and 5.5% on 1. Even a off TDC still below 10% on worst cylinder. Is there a difference between testers? Any one else been through this

    Thanks
    Gary

  2. #2
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    Would'nt think so Gary. I've found the Balzy tester has been bullet proof for me . Maybe your mechanic has'nt reached his quota this month.

    I will say I find that bore prep with proper tools is CRITICAL at re ring time to insure a long ring/bore life after rebuild.

    IMO : To do a successfull long life coated bored motor rebuild a guy needs the following tools to prep a bore correctly : :

    ID Dial bore gauge, bore straightener tool , proper grit hones and brush without these tools and an operator using them tools thats got some SAVY of the Mercury coated bored engine sometimes rebuilds are very short lived and a waste of time..

    my .02
    Jay
    Jay @ JSRE


  3. #3
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    Some leakdown test kits have different sized orifices for different sized cylinders. Fit everything from airplanes to weedeaters. So his numbers may be different. But I believe I would trust your test over theirs.

  4. #4
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    I must be paranoid!! if you took it in for electronic tests, I would question why they say they did a leak down?, and their results. especially considering the different results..just me, but I always remember Ben Dover..

  5. #5
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    i would take your equipment down and do the leakdown test yourself right infront of them...
    SPECIALIZED Racing 51
    OPA CLASS 5 NATIONAL CHAMPIONS 07-08-09-10.. 4 TIMES OVER!!!!!

  6. #6
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    I'm with johnt on this one! Why did they perform a leakdown test when
    you asked for an electrical test? If I brought my car in for an oil change
    and they replaced my oil pan... I would be pissed!

  7. #7
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    my brother works at a Ford dealership,,,the service dept calls it "up sell"
    they HIGHLY push the tecks to find and push more services..

  8. #8
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    "up sell" I'd call it a "HUMPING" doing a test you didn't order or the troubleshooting path to a problem required..

    My .02
    Jay @ JSRE


  9. #9
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    Exactly, no reason to do leak down test at all.... Quote from dealer on phone "Gary, your motor is tired, that motors got 215 hours we got leak down at 18%, If you want to use a motor at 20% leak down thats up to you, but.."

    When I told him about the rebuild he said, "Oh, maybe the engine was dry We'll have to check it again. Couldn't wait to go get the boat away from them.


    Gary

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    gee,that's funny,my leakdown showed 2%,what kind of guage do you have?!!!!!!!!!!!!
    why ask me ?


  11. #11
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    they are looking for work that is not there,i;ll bet they went for a rip also. what do you suspect is wrong with your electronics?
    Last edited by eli; 05-24-2008 at 10:37 PM.

  12. #12
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    id trust my guage over theirs

  13. #13
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    I'd be looking for a new dealer at this point. Redo the leakdown with your equipment and see if your numbers repeat. If they do you're good to go
    Charlie B
    Bullet20DC w/250 XS
    Politically Correct Impaired

  14. #14
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    Sloow down, i would just head down with your gauge and check! If it is way down like they said. They found your problem for you!!! If not take boat and go home find new dealer!

    Skdog
    2011 DCB F26
    2017 300 XS DBR

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    yup

    That sums it up right there,compression's always a good idea 2.

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