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Thread: Spalled Camshaft

  1. #41
    aktango58's Avatar
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    Mike,

    another really good point.

    Talking with my fuel supplier here last month he told me there is ONE refinery making 100LL. Most won't deal with it due to low volume and the lead and other base metal requirements creating more EPA trouble than it is worth.

    Only so many factories around making lube oil, it was five 25 years ago.

    Let's home we can outlive the 100LL supply.
    I don't know where you've been me lad, but I see you won first Prize!

  2. #42
    windy's Avatar
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    aktango58
    We’re in this together!


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  3. #43
    aktango58's Avatar
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    Quote Originally Posted by windy View Post
    aktango58
    We’re in this together!



    Sent from my iPhone using SuperCub.Org
    I will offer you a cold drink on the deck if you wish to visit.

    I am waiting for the State to get out the Highway project we have been anticipating being out to bid for the last year... told by the end of the month for the last three months. That is my engine "Go fund Me" account. Need a big project to cover these unexpected things. But, I am just happy this was found in the shop, not in flight.
    I don't know where you've been me lad, but I see you won first Prize!
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  4. #44
    BC12D-4-85's Avatar
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    Quote Originally Posted by aktango58 View Post
    And Windy, misery loves company. My engine has been red tagged due to the camshaft. Life is not easy all the time.
    What oils were used?

    Gary

  5. #45
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    Quote Originally Posted by BC12D-4-85 View Post
    What oils were used?

    Gary
    I bought the plane about 4 years ago with just under 1100 hours. I believe it was then using Aeroshell 15-50. Since I have been using Phillips XC 20-50.

    40 year old engine. Not surprised to have internal issues.
    I don't know where you've been me lad, but I see you won first Prize!
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  6. #46
    BC12D-4-85's Avatar
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    Thanks for the reply and sorry to hear about the corrosion problem. It's too common to ignore as being acceptable.

    I'm biased towards Aeroshell W80 or W100 Plus. Too much experience with 15W-50 or 20W-50 shearing down to lower grade and potentially lower oil pressure (depends on dispersed solids content) plus corrosion. Anything that needs a substantial additive package plus base oils to function as a multi-vis concerns me. At standard daily temps they are thinner (15-20W) so can drain off parts sooner. They thin like straight oils when heated but due to the add package not as much to meet the 50W viscosity range at 210*F. Eventually when the additives wear out so can the viscosity.

    We preheat when cold anyway so when oil pours unheated is of little consequence unless oil cooler congealing is experienced.

    Gary
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  7. #47

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    Usually, camshafts wear badly when lifters pit. This is caused mostly by long periods of inactivity. Think about the combustion process, by-products are Carbon Monoxide; Carbon Dioxide; Sulphur Dioxide, and water. Mix Sulphur Dioxide (S02), with condensation (water) (H2O), and we get H2SO4, sulphuric Acid, that eats and eats at metal, easily at the cam followers, where the oil drips away first, and when the lifters are exposed to the acid and air, they pit. The result is a spalled cam. I just OH the engine of my 2003 Top Cub, 200 hours total time over 17 years. The logs show the engine was serviced with preservative oil during periods of inactivity, but I found all 8 lifters corroded and pitted, drive gear corroded, corrosion in the cylinders, valve seats, and crankshaft. Spent a lot of money to make it righteous, but now have a "new" and reliable engine, runs great. Also.... Heat accelerates molecular activity. Having an engine on a "goldenrod" or other heaters all the time to keep moisture out will often accelerate acid erosion. Best to fly it often, and the less flown, the more often oil should be changed, drain out all that acid! Flight school engines I have OH are regularly run, but "tortured"! Full throttle, chop the power, full throttle, chop the power, you get the idea! More often than not, at 2000 hours, they look great inside!! Finally, when I change the oil, I cut open the filter, swish the fabric in clean solvent or lacquer thinner in a clean pan, use a magnet in a baggie, and if it looks like Richard Prior's hairdo, bite the bullet, split the case and regrind the cam, regrind or replace the lifters, before it eats at anything else!!

    ps Don't you wish Lycoming lifters could be removed without splitting the case like the Continentals?

    Regards,

    Gary Brown
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  8. #48
    windy's Avatar
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    Spalled Camshaft

    I totally agree with your comments, Gary. I don’t think that was the issue with my spalled camshaft, though. I flew that engine 2,250 hours in 8 years. Changed the oil every 30-50 hours & added CamGuard on all but the break-in oil.

  9. #49

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    SOMETIMES, THINGS JUST WEAR OUT! I bought a Piper Comanche with 3600 hours on the engine, never had a cylinder off. I called Lycoming, asked if they wanted to see a high time engine. They asked how many hours. I told them. They were not impressed, said to call them when I had a HIGH time engine! Go figure!

    g.

  10. #50
    BC12D-4-85's Avatar
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    In #46 I mentioned liking Shell's single grade Plus oils. Here's some more info> https://www.shell.com/business-custo...-30071535.html

    They also make a 80W Plus or 40W for my small Continental.

    Gary

  11. #51

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    Lets see....Oil for an Air Cooled, high EGT, long stroke, low RPM engine... Hmmmm, good for my Harley Davidson??

  12. #52
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    Sure might be ok as HD's are low pressure high flow mostly ball or roller bearing engines. The clutch pac's in the primary and transmission has it's own hole so they also can use a straight 50W like Formula+ or ?. HD's 360 or SYN3 might be cheaper tho for the engine.

    Gary

  13. #53

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    Quote Originally Posted by ExConPilot View Post
    SOMETIMES, THINGS JUST WEAR OUT! I bought a Piper Comanche with 3600 hours on the engine, never had a cylinder off. I called Lycoming, asked if they wanted to see a high time engine. They asked how many hours. I told them. They were not impressed, said to call them when I had a HIGH time engine! Go figure!

    g.
    I recall the engine on the PA-18A I used to fly towing gliders had somewhere around 7 or 8000 hours when it finally spun a bearing on me.


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  14. #54

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    Quote Originally Posted by ExConPilot View Post
    Lets see....Oil for an Air Cooled, high EGT, long stroke, low RPM engine... Hmmmm, good for my Harley Davidson??
    I ran unused left over Philips 25/60 and 100LL that was drained from junk round engine airplanes, in my old 70’s air cooled BMW R90 Motorcycle, smelled like a Cessna 150. Ran perfectly fine.
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