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crunchy sound?

Old 12-14-2006, 10:35 AM
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Darkseacret
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Default crunchy sound?

last night i had a quicky with my .16 cen baja boss all seem well it ran fine seemed real strong.ran almost whole tank coasting back to shore just got my piggise wet a little. when i got to the garage 1 min later to burn off access and give after oil . and started it, it sounded a little crunchy goosing the idle a little it cleared but returned with lower rpm,clearing it again with a plip of the throttle. i got the old "get out of the garage" just as i pulled the manifold and removed engine from hull. pulling cord with plug out it i didnt feel or see any friction or scoring on piston. hope i can fix but i quess ill have to tear it down for the first time .any quesses on what it might be going on
Old 12-14-2006, 11:20 AM
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piper_chuck
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Default RE: crunchy sound?

Typically, a crunching sound could be bearings. Another possibility could be a rusty flex shaft. How does the engine feel if you turn it over by the crankshaft? Same question for the prop shaft, does it turn freely? If you feel any roughness at all when turning the crankshaft, it's usually time for new bearings. Another slight possibility is if you're running high nitro with a plug that's too hot, you could be getting preignition. Do you see little pock marks on the top of the piston? These are a few possibilities, other people will probably add to the list...
Old 12-14-2006, 03:12 PM
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gooycheese
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Default RE: crunchy sound?

The last time I had crunching I blew my rear bearing.


Paul
Old 12-14-2006, 03:41 PM
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Default RE: crunchy sound?

ORIGINAL: gooycheese

The last time I had crunching I blew my rear bearing.
Ouch, hopefully you're feeling better now!
Old 12-14-2006, 03:59 PM
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TIA
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Default RE: crunchy sound?

Maybe there's a mini Sandy Duncan in there snackin on some Wheat Thins.......

crunch crunch crunch

Old 12-14-2006, 10:20 PM
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yeeharacing
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ORIGINAL: G-1

Maybe there's a mini Sandy Duncan in there snackin on some Wheat Thins.......

crunch crunch crunch

WOW... That was a stretch, I wonder how many will actually saw that ad.
Old 12-16-2006, 12:30 AM
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Default RE: crunchy sound?

The driveshaft ot cable can make some really nasty sounds at low speed then go away once the rev's have gone up but I'm also guessing that it's the bearings. Check the exhaust and glow plug for shiny metal particles.

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