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My Dauntless Ate A Valve.

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, Jul 20, 2021.

  1. Jul 24, 2021
    73 cj5

    73 cj5 Not ready for the junkyard yet

    Clinton, Mississippi
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    I'd be interested to find out what the oil pressure would look like without one of the connecting rods.
    I'd take a hose clamp and clamp the insert(s) around the journal to keep the pressure up.
     
  2. Jul 24, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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  3. Jul 24, 2021
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    I’m going to have to agree with Kyle here.

    what’s epic? Putting it away and hanging around a campground for the next 3weeks OR throwing a used piston and valve in there and wheeling Colorado high mountains??

    easy choice. I’ll rebuild or find an engine when I get back to Florida. I have a 231 I could swap in pretty easily while this one is fixed right.
     
    3b a runnin, Rich M., FinoCJ and 3 others like this.
  4. Jul 24, 2021
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    Without the rod, or something else clamped around the crankshaft, it would be zero.
     
  5. Jul 24, 2021
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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  6. Jul 24, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Unless you really want to ensure the block is rebuildable, I kind of agree as well...or at least I completely get the reasoning. My biggest concern would be how much finely ground metal powder has worked its way into the entire oiling system and plugged stuff up to the point that it may be hard to flush out and the repair may not last a day if it won't oil...of course, I understand why you'd take that risk. Jen and I are out of communication for the next few days (backpacking trip), but if you need any help later this coming week or into the weekend, just let me know.
     
    fhoehle and Buildflycrash like this.
  7. Jul 24, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    Complete rebuildable Dauntless around here is $100 or less, some can't be given away in running condition. Its not a major loss. Patch it up, enjoy the week. If you find a runner we can have that swapped abd running in 8 hrs
     
  8. Jul 24, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    These Dauntless issues remind me of my first Jeepster Commando I bought. The guy who owned it said it ran, but made some bad clanking noise. It happened out on the beach, but it kept running, so he was able drive it off the beach and to the local service station where he left it. He asked for $35 for it, what it would have cost to have it towed off the beach, way back then. When I checked it out, it would start right up, but ran really rough and made some serious clanking.
    I found both rods were broken on the front journal, and the lower skirt of the block was broken out, up about 3", and the oil pan had the passenger side ripped out, with a piece of the lower block still hanging on by the bent sheetmetal. The oil still registered on the bottom of the dipstick. The drivers side and bottom of the pan had a bunch of dents pushed outward.
    I gave him the $35, added a couple quarts of oil, and drove it about 6 miles home. With nothing to lose, I drove it around our neighborhood for about another week. It never quit or locked up, but sometimes I had to rock it in gear to get the starter to crank when the rods got wedged to the block side.
    I parted it out, and tore the engine down. Both front pistons were pushed nearly to the top of the bores, and one had the valve head imbedded in it. The lower cylinders were cracked apart, but the big end of the rods were both still somewhat intact on the crank journal. One big end had less than an inch of rod attached, and the other had close to 2" of rod.
    One rod was almost z shaped, still attached to the piston. The other side had the piston so smashed in the cylinder that I had to beat it apart to get it out.
    I saved the flywheel/clutch, timing cover, intake, 4 pistons/rods, and one head. Not very much else was salvagable.

    Hopefully Scott will have better luck. Make sure you have all oil "leaks" (lifters and rockers, and main journals) in place if you replace a piston. Also, count on your rod being bent, so replace that with the piston. Check the head for fractures that will leak coolant. An exhaust valve could be stuck back in there with a bit of dremel work cleaning the worst of the seat.
    Best of luck -Donny
     
    ITLKSEZ and Ol Fogie like this.
  9. Jul 24, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    With that piston damage, the rod is pretty suspect too.

    I tend to agree with the cautious folks. While you might be able to half-assed it together, I wouldn't want to be the guy that needs a tow out of a tough trail.
     
    fhoehle and Glenn like this.
  10. Jul 24, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    ... and inconveniencing everyone else's day in the process.
     
  11. Jul 24, 2021
    Zoomer

    Zoomer eJeeper (walking)

    Minnesota
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    Rent an engine hoist and do an engine swap? Sounds easier and likely more reliable to me. You've got good working carb, alternator etc on your current engine.

    1967-1974 Odd Fire V6 engine Kaiser Jeep Corp/AMC - auto parts - by...

    Not sure what the trails are like, but how do you get it back to the trailer if it breaks down in the middle of nowhere? Are you wheeling with a group?
     
  12. Jul 24, 2021
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
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    He is already staged at the campground and was ready to go on this year's Colorado epic.

    http://www.earlycj5.com/xf_cj5/index.php?threads/colorado-trip-2021-aug-2-6.146073/

    He has his tow rig for the 5th wheel camper and I'll have my Expedition with my tow bar among the other folks from here.

    I'm already limited to approved trails with a rented jeep. But like the discussion on me and my jeep in the trail ride thread. Breakdowns happen and it's not like the Rubicon. we will have access to tools and tow vehicles in a reasonable amount of time.
     
  13. Jul 24, 2021
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I don't have any issue dragging you to trailhead. Ive been that guy. Leave that heap at the street and grab the bitch seat. We'll sort it out in the evening on the way back.
     
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  14. Jul 24, 2021
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    I should have almost a week of testing. Parts come Monday. It’s running Tuesday afternoon.I’ll drive into town daily and some easy trails. I’ll keep the tow-bar attached for a few days.
     
  15. Jul 24, 2021
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Northern California
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    Now imma get really backwoods here….. but beer can material makes a great bearing shim….. :ninja:
     
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  16. Jul 25, 2021
    fhoehle

    fhoehle Sponsor

    Harford Township, PA
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    I suspect there will be a longitudinal crack down the bore and a cracked head as well. If not, I would say you are very lucky. If you run it, there will be metal shavings to eat at the cam and crank bearing surfaces.
     
  17. Jul 25, 2021
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    I'd work on it with whatever parts have been offered and/or purchased.
    He's got plenty of time.
    Beats sitting around camp doing nothing.
    He's gone to great expense just to get there.
    Do what you can and try it.
     
  18. Jul 25, 2021
    Steve's 70-5

    Steve's 70-5 Active Member

    Louisville, Ky
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    Try to fix it and see if you can get it running. If you get it running, test drive for a while. If it is running good, run the Epic. If you get a few trails done, what a story you can tell
     
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  19. Jul 25, 2021
    Zoomer

    Zoomer eJeeper (walking)

    Minnesota
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    I think I would road trip the 100 miles each way and pick up the used engine on Craigslist, but check compression on it before buying. Put your carb, and engine accessories on it, buy exhaust gaskets in Denver and rent an engine hoist in Leadville if possible to put it in. Just seems easier and likely more reliable. Heck, may even be a long term fix for you.

    Good luck with whatever you decide to do.
     
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  20. Jul 25, 2021
    supertrooper

    supertrooper Member

    moreno valley, ca
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    Scott, have you pulled the rod cap off yet? I would be interested to see if the rod bearing picked up any metal particals. Those cunks look pretty big and hopefully the oil filter cought most of the fine metal partical. I would cut open the filter, if its full of metal i wouldnt waste time with a field repair. The chances of seizing a bearing would be too high. If the rod bearing and filter are not imbedded with metal i would hone out the bore and throw in a piston and rod.
     
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