4.9 main mearing thump getting worse? - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 main mearing thump getting worse? in Cadillac Engine Technical Discussion; Ok thanks guys and yes it's the original motor with 104,000 miles on it and idk what to do change ...
  1. #16
    mike93 is offline Cadillac Owners Fanatic
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    Re: 4.9 main mearing thump getting worse?

    Ok thanks guys and yes it's the original motor with 104,000 miles on it and idk what to do change the oil and put 10w30 in there or what tne oil is only 400 miles old don't feel like changing it yet ive been using that oil for 6 months now and just know it started knocking worst idk what i should do?

  2. #17
    steelybill is offline Cadillac Owners Enthusiast
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    Re: 4.9 main mearing thump getting worse?

    Changing the mains in the car is not all that bed (just messy under the car, oil dripping on your head etc) There is a tool for that, which is inserted in the oil hole in the crank, to rotate the top half of the bearing out, and a new one in, by turning the crank. It's the only way to do it in the car. I never had the tool, and made them from a big cotter pin, flattened to a "T" on the loop end.
    You need a torque wrench if you do it, to torque the main caps when going back together.

  3. #18
    mike93 is offline Cadillac Owners Fanatic
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    Re: 4.9 main mearing thump getting worse?

    Ok thanks guys im going to automotive school and they said if i buy a junkyard motor they will rebuild it with me and can sway the rebuilt one in my car what motors will fit 4.5 or what would you go with if a 4.5 could fit? other than 4.9 and 4.5 any other motors can I put in my 93?

  4. #19
    Sevillian273's Avatar
    Sevillian273 is offline Cadillac Owners Connoisseur
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    Re: 4.9 main mearing thump getting worse?

    Only the same motor it came with especially if it's a practice rebuild.

  5. #20
    mike93 is offline Cadillac Owners Fanatic
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    Re: 4.9 main mearing thump getting worse?

    ok guys thanks

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