beelzebob
Does the GT990 engine oil breather require any kind of maintenance? My engine leaks oil while running but unable to trace source. Because the oil leak is most evident on the generator end, changed the crankshaft oil seal on that end but it has not stopped leak. 
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Wireform
I have the GT990 and never has the breather leaked.
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78buckshot
The breather check valve is bolted to the flywheel/right end of the engine and a rubber tube connects that to a nipple on the air filter box. If it came loose or the tube is split you will have oil vapor emitting from it. Historically the 990 - 999 engines have not had a breather issue.
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