O-300s - Love em? Hate em? Typical maintenance costs and overhaul cost

Discussion in 'Maintenance Bay' started by Ceraphiim, Dec 3, 2019.

  1. Ceraphiim

    Ceraphiim Filing Flight Plan

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    Howdy Folks! I have found several threads on here throughout the years about the O-300, but not where all these answers are lumped together. I know very little about them having little experience running or working on them. So tell me what you know! Do you love it or hate it? What are the common problems you find, and what is the total cost of the typical overhaul on one?
     
  2. unsafervguy

    unsafervguy Pattern Altitude

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    i get to be the first with the popcorn.........
     
  3. unsafervguy

    unsafervguy Pattern Altitude

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    there are people that love them and people that hate them. all engines have bad things and all engines have good things. im sure tom will jump in, he knows them inside and out.
     
  4. Flybuddy

    Flybuddy Pre-takeoff checklist

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    Good, simple engines. Basically a 6 cylinder O200 (uses the same cylinders). Parts are reasonable. Flew an old 172 with the 145hp O300 and it was similar in performance to the O320s (150hp) and ran much smoother.
     
  5. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    That sums it well enough.
     
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  6. flyingbrit

    flyingbrit Pre-takeoff checklist

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    I've owned one for 18 years now and like it well enough. Biggest recurring problem has been sticky exhaust valves/guides. I recommend they be checked every 100hrs, and cleaned/reamed if necessary.
     
  7. Brad Smith

    Brad Smith Line Up and Wait

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    0-300 is typically smoother running, uses a little more fuel than its 4 cyl rivals and has a factory reccommended 1800 hr TBO vs a 2000 TBO for an 0-320. Overhaul cost a little more due to two more cylinders and there are more possible failure points due to the extra cyls, valves, rods etc. They do sound a lot healthier than a 4 cylinder engine. I wouldn't be afraid to fly behind one.
     
  8. Stan Cooper

    Stan Cooper Cleared for Takeoff

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    I had one for ten years (1963 C172D) and found it reliable and relatively inexpensive to maintain. I did have two stuck exhaust valves within a couple of months of each other and did a top overhaul with six new ECi Titan Cerminil cylinders that have valve rotators and never had another stuck valve. A lot of owners complain about corrosion of the magnesium oil pan, but mine showed no sign of corrosion either internal or external. Also, some owners say the O-300s are more susceptible to carb ice, but I didn't find that to be true.
     
  9. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    TBO moot point, no one comply's
     
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  10. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    0-300-A (145) getting hard to find, 0-300-D plentifully, but expensive $ 7,000 - no core

    oops..
    http://www.aircraftspecialties.aero/o300d-crankshaft-653382/
    add 1800 for core.
     
    Last edited: Dec 3, 2019
  11. Stan Cooper

    Stan Cooper Cleared for Takeoff

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    Good to see you posting, Tom! :thumbsup:
     
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  12. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    nothing else to do :)
     
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  13. schmookeeg

    schmookeeg Cleared for Takeoff

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    I'm in the love-it camp. We ran one from 0 to 4400 hours smoh before it started making metal, in a 172F. Noticeably smoother vs the 4-banger Lycs.
     
  14. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    enjoyed ours
    except for all the valve sticking (very distracting at night on an XC)
    this was 1970's 80's...before most people knew how to lean an engine.
    and older fuels if that had any hand in it
     
  15. GRG55

    GRG55 Final Approach

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    :yeahthat:

    Can they be run on mogas? And would that make a difference for the valve sticking? Weren't they originally were intended to run on 80/87?
     
  16. pigpenracing

    pigpenracing Pattern Altitude

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    Run Marvel Mystery Oil in the fuel and it pretty much cures the sticking valve problem. I like the O-300...
    Right now I have a Cessna 175 with the GO-300 and I really like it. It performs well.
     
  17. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    Like a blend, 2 gallons of 100LL to 3 gallons of 92 mogas.
     
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  18. Kenny Phillips

    Kenny Phillips En-Route

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    We bought ours from a retired corporate pilot/A&P/IA, who did an annual each year, and didn't fly it. Due to the short run time at annual, and the sitting about, the water that collected in that pan caused serious corrosion. We didn't have to replace it, but another year of disuse and it would have corroded through. We did an overhaul on it, had the cylinders bored (they had rust as well.) Putting 300 hours a year on it certainly stopped that, and it belongs to an FBO where you can rent it now.
     
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  19. Grum.Man

    Grum.Man En-Route

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    Like pretty much every other engine it's more about how they were taken care of than the design or manufacturer. My only complaint is they are pretty thirsty for the HP they produce. While it does have more cylinders than an O-320 they are a little cheaper which helps offset the added quantity.
     
  20. 455 Bravo Uniform

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    What other airplanes used the O-300s? I see you guys mentioned the 172.
     
  21. Grum.Man

    Grum.Man En-Route

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    Aeronca Sedan
    Cessna 170
    Some Maule M4's
    Bellanca 14-13-2

    Those are the ones that come to mind quickly. Depends if you want to count the Lycoming 145
     
  22. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    Oil sumps can now repaired. If it does not have a hole in it.
     
  23. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    You missed the obvious ones. :)
    Baumann Brigadier
    T-41 Mescalero
    Meyers MAC-145
    Taylorcraft 15
    Temco TE-1A
    GO-300
    Cessna 175
    Goodyear GZ-19 and GZ-19A

    Good 'nuff for a blimp, good 'nuff for me.
     
  24. Kenny Phillips

    Kenny Phillips En-Route

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    The 175 has a geared variant.
     
  25. NordicDave

    NordicDave Cleared for Takeoff

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    Only downside of O-300 is extra costs for overhaul and maintenance with 2 more cylinders and less power than a Lycoming O-360. Thus the reasons why it's obsolete in favor of the IO-360 or O-360 with more power and only 4 cylinders. Six cylinders are smoother, at least the ones I've flown.
     
    Last edited: Dec 4, 2019
  26. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    Yes, the GO-300.
    Same as the blimp.
     
  27. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    You want to compare overhaul prices, then compare costs of like items
    0-300-D are around $25k
    0-360 are about $45k
    (overhauled)
    Plus the cost to convert.. $40-60K

    what does 4 new 0-360 cylinders vs 6 new superior cylinders today?
     
  28. frfly172

    frfly172 Touchdown! Greaser! PoA Supporter

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    Had a 1962 ,172 loved it never a . bit of trouble
     
  29. Fearless Tower

    Fearless Tower Touchdown! Greaser!

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    Don’t forget the lack of critical parts like replacement crank shafts.

    Aside from the occasional sticking valves, the O-300 is a great running engine. But when you have to send it off for overhaul, you best hope the crankshaft is within tolerance.
     
  30. NordicDave

    NordicDave Cleared for Takeoff

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    Good point.

    Also overhaul costs from Corona Engines with new Superior cylinders are $16,795.00 for O-360 overhaul and $22,925.00 for O-300. Almost worth an STC fee for upgrade consideration.
     
  31. ktup-flyer

    ktup-flyer En-Route

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    I've only flown behind one once, but I liked it a lot. Didn't have excess power, by any means, but damn those engines are smooth.
     
  32. Tusayan

    Tusayan Filing Flight Plan

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    Bellanca 14-13-2 Cruisairs have Franklin six cylinder engines, Cruisemasters have O-435 Lycomings or O-470 Continentals but no Bellancas have O-300s.
     
  33. Tom-D

    Tom-D Taxi to Parking PoA Supporter

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    I doubt that these are realistic prices.
     
  34. iflyvfr

    iflyvfr Pattern Altitude

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    I've flown behind mine for around 14 years now and lean rigorously. I've had zero issues with carb ice or sticking valves. Mine consumes oil, more as of late, we haven't figured out exactly where yet. The old pushrods with the swedged ends and no springs are notorious for leaking, so if I keep my bird and O/H it she will get the Real Gasket mod for each cylinder (mod works, 1/2 my engine has them). I've replaced 3 cylinders over the years and am about to replace a 4th.

    She is super smooth as others have said and has been reliable. Pull the back seat out and wheel pants off and save about 40 lbs payload for higher elevation. Used that tactic last year in the high country and she performed remarkably well up to 12,500 solo with gear. On fuel consumption, properly leaned I routinely see 6.5 GPH. I think I was in the high 5's when in Colorado at a few points like Cumbres and La Manga passes.
     
  35. Stan Cooper

    Stan Cooper Cleared for Takeoff

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    Greg, when I replaced all the cylinders in my O-300 with ECi Titans I also installed the Real Gaskets pushrod tubes. It was definitely a worthwhile mod; the pushrod tube oil leaks stopped completely.