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- Possible Causes
- __ Broken exhaust valve spring (s)
- __ Broken timing gears
- __ Broken crankshaft (rare)
- __ Frozen pump impeller (winter only)
- __ Leaky head gasket
- __ Piston rings gummed to cylinder
- __ Seized pistons or dry pistons
- __ Valve gears out of time
- __ Valve stuck (rare)
- __ Water or rust in cylinder
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