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Flat Cam Lobe?

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Old Jul 18, 2018 | 09:49 PM
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Originally Posted by TexasScooterTrash
Do a diagnostic scan for error codes.
Did. No codes.
 
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Old Jul 18, 2018 | 11:32 PM
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Maybe the engine is sumping oil.
 
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Old Jul 19, 2018 | 08:27 AM
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Originally Posted by joe40x
Or a loose nut behind the handlebars.
Latest saga


.
 
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Old Jul 19, 2018 | 12:07 PM
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Do modern roller cams ever go flat? Can't say I've ever heard of it happening. I've seen some lobes damages from seized rollers on 6.0 Chevy engines, but they still ran fine.
 
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Old Jul 19, 2018 | 02:21 PM
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Yes, cam lobes can wear down. "Sumping"??
 
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Old Jul 19, 2018 | 02:32 PM
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"Sumping"? .. Sheltered life? :>) Do some of the basics first ... Check the plugs. Compression Test
 
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Old Jul 19, 2018 | 02:43 PM
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Umm, compression test? If the valves are hardly opening, that'd expose it
 
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Old Jul 19, 2018 | 02:52 PM
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Originally Posted by Uncle Larry
"Sumping"? .. Sheltered life? :>) Do some of the basics first ... Check the plugs. Compression Test
This aint' my first barbecue, Cletus. Replace plugs and wires first.

 
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Old Jul 19, 2018 | 03:04 PM
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Leakdown test. If you don't have a fancy leakdown test tool you can do the redneck test. Take a compression tester and take the valve out of the hose. Set the gauge aside, as you will not need it. Put the piston at TDC. Thread the hose into the spark plug hole, and hook up the compression tester hose to your air compressor and shoot some air into it. If air comes out the intake, intake valve. If it comes out of the exhaust, exhaust valve. If it comes out of the crankcase vent, rings or hole in piston. If a spring broke, it might have let the valve sag which might have hit a piston and bent it.

If it runs fine up until 3k, might be a lifter not building up hydraulic pressure.
 
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Old Jul 19, 2018 | 03:15 PM
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Cam lobes are case hardened. Once the hard layer is compromised, the steel underneath is butter. The "case" may only be .025" thick. It's usually caused by a lubricant problem. (Either quality or OCI issue.)
This is, presuming there's no debris to cause a failure.
 
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