Rich Posted December 17, 2013 Report Share Posted December 17, 2013 Roger, Have you looked at the cam lobe on the ROAN 4 stroke forum? No one has answered the question. Thought you might take a look and comment. Looks like the top layer of the lobe is pealing off. I tried to copy and paste the pix here but no luck. Link to comment Share on other sites More sharing options...
Roger Lee Posted December 18, 2013 Report Share Posted December 18, 2013 I am talking to them. They have not answered my question if it is just discolored or actually ground down or pitted. New info, We have heard back and it was only discoloration which is normal especially with an older engine. It isn't an issue to worry about. Link to comment Share on other sites More sharing options...
FastEddieB Posted December 18, 2013 Report Share Posted December 18, 2013 That sure looks like more than just discoloration! Or is that an optical illusion? Link to comment Share on other sites More sharing options...
Roger Lee Posted December 18, 2013 Report Share Posted December 18, 2013 It's just discoloration and it's where the tappet rotates. Link to comment Share on other sites More sharing options...
Rich Posted December 18, 2013 Author Report Share Posted December 18, 2013 Looks much worse on the ROAN site. Link to comment Share on other sites More sharing options...
FastEddieB Posted December 18, 2013 Report Share Posted December 18, 2013 It's just discoloration and it's where the tappet rotates. Is it smooth to the touch? If so, that's quite the illusion in the photo: I mean, that looks like a worn area with a shadow. In any event, Continentals of a certain vintage were plagued with spalling lifters. On those, it was opined that once the hard coating was gone, wear would very rapidly increase. And once that happened, the cam was at risk, turning a relatively inexpensive repair (replacing a lifter) with a very expensive one (replacing a camshaft). In them, it started as just a surface roughness on the lifter, which Continental told owners was "self-healing". That got a good laugh on the Cirrus website! Link to comment Share on other sites More sharing options...
Roger Lee Posted December 19, 2013 Report Share Posted December 19, 2013 If you loose the hardness coating on a lifter or cam lobe on a Rotax at its 5000+ rpm there will be no notice and it will happen instantly. Link to comment Share on other sites More sharing options...
FastEddieB Posted December 19, 2013 Report Share Posted December 19, 2013 Roger, That is NOT a photo of a compromised hardness coating? Link to comment Share on other sites More sharing options...
Roger Lee Posted December 19, 2013 Report Share Posted December 19, 2013 Hi Eddie, No it is not. Link to comment Share on other sites More sharing options...
FastEddieB Posted December 19, 2013 Report Share Posted December 19, 2013 OK, I'll take your word for it. Like I said it must be a weird illusion in the photo. Link to comment Share on other sites More sharing options...
Roger Lee Posted December 19, 2013 Report Share Posted December 19, 2013 If the hardness coating goes even in one spot it gets really ugly really fast. There is no question what you're looking at. Link to comment Share on other sites More sharing options...
Runtoeat Posted December 20, 2013 Report Share Posted December 20, 2013 Roger, I know you're the expert but I'm in Eddie's camp. If this were my engine and you were standing right next to me telling me it's nothing but discloraton, I wouldn't sleep that nite until I found something with a point and gently ran it past the area where Eddie's yellow arrow is. Link to comment Share on other sites More sharing options...
Roger Lee Posted December 20, 2013 Report Share Posted December 20, 2013 Hi Dick, I agree and that has been done. Link to comment Share on other sites More sharing options...
Runtoeat Posted December 21, 2013 Report Share Posted December 21, 2013 Hi Roger, I slept like a baby last nite. -_- Link to comment Share on other sites More sharing options...
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