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232 Engine Question // 1973

Discussion in 'Intermediate CJ-5 and CJ-6 Tech' started by James Robbins, Dec 4, 2018.

  1. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    I have been advised that I need to replace my original 225 inline 6. The problem started when I turned the motor over and it tries and tries but won't start. Any ideas on what can replace and the best place to possibly find a rebuilt inline 6 for my '73?

    Thanks guys.
     
  2. Dec 4, 2018
    Walt Couch

    Walt Couch sidehill Cordele, Ga. Sponsor

    cordele, Ga.
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    What have you done to confirm that you need another engine? Compression test, fuel pump good, ignition good and in time, etc etc. I thought the 73's came with a 232 or 258? Sure about your engine?
     
  3. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    You are right. Its a 232. My mistake. Thanks for the input. I am taking it to a guy that was advised to me this forum. The guy mentioned oil on plug. But I know ignition is good...gonna have this guy check fuel pump and compression....

    thanks!
     
  4. Dec 4, 2018
    Chilly

    Chilly Active Member

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    Start with compression check of each cylinder. When you crank the starter does iy spin at an even tempo or does it surge fast every few revolutions? That could indicate bigger problem such as a hole inna piston, burned exhaust valve, broken valve, etc.

    Is carb getting fuel? If you route rubber fuel line feeding carb into a jar while cranking the engine you should see fuel flow if the oump is good.

    Oil on a plug could be worn valve stem seal. They become brittle and break away sometimes. Might just need new seals, which can be replaced without removing the head with the right tools.
     
  5. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    Will do and thank you for all input!
     
  6. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    Ok. Just got it back and the tech said fuel was flowing fine so no fuel issue. But "blow back" was the phrase he used that had him determine I need a new 232. Said he replaced all the plugs because of the blow back....Does this help any??
     
  7. Dec 4, 2018
    Chilly

    Chilly Active Member

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    Does this thing run now that he changed the spark plugs? I think he's telling you the cylinders are loading up with crankcase oil because cylinder bores and rings are worn. If that is true, and if it runs, it should smoke really bad, too. Does it run, and does it smoke?
     
  8. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    Yes. But smoke is not too bad. The term he used was actually "blow-by"...Which I now think I know is the problem...Short of a new engine can the cylinders be reworked?
     
  9. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    And yes, your cylinder assessment is correct above...
     
  10. Dec 4, 2018
    Chilly

    Chilly Active Member

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    Blow-by is same condition I described. Piston rings no longer well sealed to the cylinder bore. Exhaust gasses leak into crankcase on firing stroke, oil isnt scraped off cyl walls on upstroke so gets oil on pligs and pistons. But could also be valve seals. Did he do a compression check?
     
  11. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    I did ask if he had done a compression check and he said "no" manly because the blow-by was all the proof he needed apparently that the engine is thru. I cranked it and drove it home...but the problem will persist I imagine...
     
  12. Dec 4, 2018
    Chilly

    Chilly Active Member

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    I dont relish second guessing the guy who has the engine in front of him, but mechanics should understand that their trade's reputation has been sullied by unscrupulous or unskilled colleagues so customers will sometimes ask for the details.
     
    Rich M. likes this.
  13. Dec 4, 2018
    James Robbins

    James Robbins jrobb

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    Thanks Chilly. I am taking to a guy this forum advised and he will "make the call" but I will certainly ask for a compression test of all cylinders....
     
  14. Dec 4, 2018
    Chilly

    Chilly Active Member

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    Compression test is how you diagnose blow-by. Seems like he diagnosed "oily plugs" and jumped to a conclusion. It may well be, and if every plug was oily it probably is. And I'd STILL do a compression test.
     
  15. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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  16. Dec 4, 2018
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member Sponsor

    Tantallon, Nova...
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    As suggested do a compression check and a cylinder leakdown test if you have a compressor handy, lots of step-by's on the net.

    How many miles on the engine?

    Did this issue just pop up or has it been coming on for a while?

    How's the oil pressure?

    If you want to save your engine be prepared to pull the head & check the cylinder bores but odds are if the rings are that far gone it's going to need a complete rebuild.
     
  17. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    Will do:

    How many miles on the engine?
    A) Million (bought it from an old man 2 years ago...no clue on mileage)

    Did this issue just pop up or has it been coming on for a while?
    A) Seems like a new issue for sure...no "coming on" persay

    How's the oil pressure?
    A) Not sure
    If you want to save your engine be prepared to pull the head & check the cylinder bores but odds are if the rings are that far gone it's going to need a complete rebuild.
     
  18. Dec 4, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member Sponsor

    Denver, CO
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    There is always degrees of decision making here...My 258 developed started to develop quite a bit of blow-by over the years I had it, but I kept driving it. At least in my case, its a bit of a pita in have the oily combustion chamber in terms of fouling plugs, and if you have emissions checks, and in the case of mine - the pcv seemed to feed a lot of oil back into the carb etc (not sure I quite figure why though - high compression pushed the oil through into the crankcase and up through the pcv valve?). In any case, it just kept running. I don't know that I would say it is something that has to be fixed if its just blow-by due to long term wear. Its generally not something that is a catastrophic failure - more of a slow death and you know a rebuild is out there in the future at some point (or swap to a 4.0). If it is specific to one cylinder (compression and leak down may help determine) then maybe worth a quick repair?
     
    ITLKSEZ likes this.
  19. Dec 4, 2018
    tarry99

    tarry99 Member Sponsor

    Northern California
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    Do the leak down test on each individual cylinder...........or find someone that can............much easier to isolate the problem...........Rings / Pistons , cylinder head / valves......
     
  20. Dec 4, 2018
    James Robbins

    James Robbins jrobb

    Atlanta
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    Great input and thank you gents!
     

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