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'82 6.2 very low compression on all cyls

Discussion in '1982-Present GM Diesel' started by Steve_87K5, May 5, 2005.

  1. Steve_87K5

    Steve_87K5 1/2 ton status

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    Location:
    central NC
    Finally got around to cranking an old Goodwrench red-block C-code 6.2 a guy gave me. It sat for a long, long time in a junked suburban and the guy told me it was probably a good engine, since he had received it new under engine replacement warranty. Supposedly a low mileage engine.

    I have it on a stand with a geared starter and an Optima battery. All glow
    plugs removed, diesel test PSI gauge screwed into glow hole.

    Primed the oil pump with elec drill. Good oil pressure. Squirted 30 weight in cyls thru glow hole, cranked it a bit to blow out some oil, and let it sit. Then, later, all cyls tested at about 125 PSI. Couldn't believe it, so I hooked up my gas compression gauge to it. Same results.

    I have some MM oil in there now just soaking. Maybe the rings are seized?

    Any ideas?
     
  2. kennyw

    kennyw N9PHW Premium Member

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    I'd guess the rings have stuck from sitting more than anything. Do you have the tools to do a leak down test?
     
  3. Steve_87K5

    Steve_87K5 1/2 ton status

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    I have never done a leak down test but I have
    heard of it. I had an article one time describing how to build a home made
    leak down test rig.
     

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