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Motor question....

Discussion in 'The Garage' started by Calclips, Aug 6, 2002.

  1. Calclips

    Calclips 1/2 ton status

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    I'm looking at buying this K20 from a local wheeler. I know this thing has seen alot of offroad time in it's day, it's got a t350 tranny and a 205 t-case swapped into it. The motor looks to be fairly new, it has a nice fresh coat of paint on it and isn't a leaky SOB. The guy I may buy it from pulled the old intake and carb off of it and swapped it out, while he was in there he said that the oil galleys were clean as a whistle, and when he rolled over the motor all of the lifters came up good and the cam didn't appear to have any flat spots in it. Does this mean that the motor is most likely going to be a solid motor, or is that not enough information to base an estimation on?
     
  2. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    If you are concerned about the motor, just do a compression test. All cylinders should be within 10% of one another.

    Mike
     
  3. Calclips

    Calclips 1/2 ton status

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    What should the compression be arround? The motor is pretty much stock.
     
  4. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    If it is a stock 350 and IIRC it should be around 125 to 150 PSI. Anyone?

    Mike
     
  5. Calclips

    Calclips 1/2 ton status

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    how do you work a compression tester?
     
  6. backyardbuilt

    backyardbuilt 1/2 ton status

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    You stick the rubber end in each spark plug hole and turn the engine over a couple of times unless you have the expensive threaded one the you screw it in the spark plug holeand turn the motor over a couple of times.
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The threaded one is most accurate. Hold the throttle wide open and spin it over 4 or 5 times. 125-150 is good compression...

    If you find a cylinder that reads low remove the tester from that hole and squirt in a tablespoon or so of oil. Now test it again. If the compression is higher with the oil the rings are worn, if there is no change the compression loss is valve related.

    Rene
     
  8. backyardbuilt

    backyardbuilt 1/2 ton status

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    That is a cool trick with the oil never though about doing that one more reason CK5 is great.
     
  9. BIG STEVE

    BIG STEVE Registered Member

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    dont forget to pull all the plugs before you start
    90 jimmy 350tbi sm465 241 14rear 10 lock right front
    web page
     
  10. MJF

    MJF 1/2 ton status

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    Why would you need to pull all the plugs? Shouldn't you just pull the coil wire to prevent it from starting?
     
  11. lizard

    lizard 1/2 ton status

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    To allow the engine to spin freely. But be warned! Before you pull all the plugs be sure to clean the engine and around the plug holes (compressed air works good) or you can suck in dirt, sand, etc.

    The i d uh behind a compression test is to check the condition of the engine without doing damage /forums/images/icons/wink.gif
     

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