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Stuck piston rings

  • 04-02-2020 11:44pm
    #1
    lalababa
    Registered Users, Registered Users 2 Posts: 1,736 ✭✭✭


    Bike was standing for 8 years. Engine turns fairly freely...turns by itself when past tdc. 100psi on dry compression test, 160 on wet. Specs are 140 to 190.
    Do ye reckon rings are stuck in ring grooves?
    Anybody get these unstuck through lubrication?
    I'm going to put a half cup of oil down cylinders and hand crank for a week.


Comments

  • #2
    H_Lime
    Registered Users, Registered Users 2 Posts: 1,817 ✭✭✭H_Lime


    https://www.ebay.co.uk/itm/3-IN-1-Waterproof-USB-Inspection-Camera-Boroscope-Snake-Scope-Endoscope-6-LED-UK/114033029163?hash=item1a8ce5f02b:m:m-VeZmSE6Sj9L36Igm5BGNA
    Pull a plug and have a look see.
    I'm guessing it's a rust mark from standing as you say. That is assuming it hasn't coated bores of some sort, if she does its rip her time.
    I'd probably do as you are suggesting as you've nothing to lose but I'm not terribly experienced here. The smart move is probably pull the barrel and hope a hone solves the issue.
    If she does free up after hand cranking on and off for a week keep a real close eye for smoke and oil consumption afterwards.

    Love to see the pic of the bores at bdc!


  • #3
    lalababa
    Registered Users, Registered Users 2 Posts: 1,736 ✭✭✭lalababa


    No big difference so far, got most of the oil out and am going to add half cup of diesel. Also going to do valve clearance as if I get her up a few psi enough to start the temp rise is supposed to free the rings over time.
    If those don't work tis time to go digging.


  • #4
    jeremyr62
    Registered Users, Registered Users 2 Posts: 163 ✭✭jeremyr62


    If you actually plan on using the bike then I would recommend riding it for a while. If its a multi then you might find it OK. I have seen engines with low compression run fine when used.


  • #5
    multiscan
    Registered Users Posts: 54 ✭✭multiscan


    lalababa wrote: »
    No big difference so far, got most of the oil out and am going to add half cup of diesel....
    If those don't work tis time to go digging.
    used a bit of kerosene before and it did a trick on various engines


  • #6
    Hotblack Desiato
    Registered Users, Registered Users 2 Posts: 35,513 ✭✭✭✭Hotblack Desiato


    lalababa wrote: »
    No big difference so far, got most of the oil out and am going to add half cup of diesel.

    to the engine oil? Why?
    Diesel has no lubricity so I'd wonder about its effects on bearings...

    Scrap the cap!



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  • #7
    mi99
    Registered Users Posts: 18 ✭mi99


    hello i once used a light oil on a 3 cylinder bike and a heat gun with the plugs out wait until the oil starts to boil and try moving the engine with a spanner front wise and backwards nice easy until the engine turns over it worked or me


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