I recently purchased ($20) a ~25 year old Craftsman-branded Poulan chainsaw, model number 358.355051. It’s a 2.0 cubic inch 16 inch saw. I rebuilt the carburetor and the engine now runs fine. The chain was on backwards so I fixed that. The oiler doesn’t work, unless you call oiling the bench and not the chain working. The oil leak was due to missing gaskets on either side of the oil pump/oil metering assembly. I fabricated some gaskets from sheet gasket stock and that fixed the leak. But the oiler still didn’t work. After noodling around the internet I realized the oil supply tube from the oil pump was completely missing. So I bought some fuel line and made a replacement. But the oiler still didn’t work. I removed the oil pump body assembly 530010195. I put a hose on the end with the oil metering disk and tried to blow through it—no air flow. I rinsed the oil pump body assembly in throttle body cleaner. Now if I blow hard there’s some airflow but it doesn’t seem likely to be enough. If I suck air from other end (the barbed fitting) it’s better, i.e. I can suck air out of the barb but can’t blow air back into the barb. But that’s not how the “pump” operates. So it seems like that check valve is bad. Of course 530010195 is a discontinued part. I searched eBay and found some one way check valves with 1/8” barbs and figured I could replace the failed “pump” with one of them. I would plan to save and use the oil metering disk. But then I ran across a few postings where people say the usual problem with these saws is another check valve, one mounts under the clutch assembly, PN 530069142. That PN is now also discontinued. I haven’t taken that valve out yet. But it doesn’t seem likely I’d be able to make a work around for it. So my questions are: Is there some way I can resuscitate or rebuild the 69142 valve? Instead of try to cobble together home brew versions of both check valves am I better off trying to retrofit a manual oiler pump? If I could get a pump that would screw into the oil fill hole that would be pretty simple. Overall, the saw is in very good condition and doesn’t seem to have seen much use. If I can fix the oiling problem I’m sure the saw would fulfill my occasional home owner needs. BTW, I assume the function of the 69142 valve is to allow ambient air to flow into the crankcase so oil can flow out? And the function of the 10195 valve is to prevent oil from being sucked back into the crankcase? Is blow-by from around the piston the force that pushes oil to the chain? I am brand new to chain saws so I apologize if these are dopey questions.