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Posted
I am disassembling a 16hp Briggs to clean up and then install on a 7117 that I acquired without an engine. The problem I have I have run into on two Briggs engines. The Phillips head machine screws that hold the screen onto the aluminum pulley on the flywheel are stuck tight. On the other engine I tried every thing to get them out including Craftsman screw extractors. They just cut out the heads of the screws but never budged them. I’m thinking of grinding the heads off and then drilling the screws out in the drill press. Any other suggestions? TEJ
sandyhillbill
Posted
Just got done doing the same thing myself on a 16 hp Briggs. drilled two screws out and retapped to 8/32 and put hex head screws back in all four holes.
Posted
I have used and impact screwdriver, but a regular philps screwdriver should do the trick. Just put the screwdriver on the screw and hit it with a hammer it should do the trick.
PatRarick
Posted
quote:
Originally posted by RayS
I have used and impact screwdriver, but a regular philps screwdriver should do the trick. Just put the screwdriver on the screw and hit it with a hammer it should do the trick.
Works nearly every time, if you haven't already stripped or damaged the screw head. You need to be careful of the impact you use when knocking them loose. You can break the pulley. Pat
Posted
I bought one of the cheap Harbor Freight impact screwdriver kits years ago for under $10. It doesn't get used very often -- every couple of years, maybe, but when you need it, it certainly comes in handy... With no more often than I use it, the cheap quality and cheap price has worked well. I originally bought it to remove the door hinges on VWs, which used a big Phillips head screw...
Posted
I have a Craftsman version that I bought for the same reason, VW door hinges. Would work OK I I was the first to remove the screws, If someone else tried and rounded the slot, I used to grind back the driver bit a little to give it a clean sharp edge to dig into the screw head. GregB
HubbardRA
Posted
If you have already boogered up the philips section, I would use a dremel tool with the carborundum cut-off disks to make a slot for a straight screwdriver. Then put your full weight against the screwdriver to hold it into the slot and turn it with an adjustable wrench. I have done this several times. By-the-way, the impact drivers, that Kent was talking about, also come with straight screwdriver bits. An impact driver can also be used after grinding the straight slot. I have a couple of those impact drivers at home for just this type of situation.
firefoxz1
Posted
I used a small vise grip in combination with a screw driver and got three of my four out that way. gripped on the head with the vice grips and turned with the screwdriver at the same time. I have an impact driver too but was afraid of breaking or bending the pulley. I bought mine for motorcvcle engines because the big philips was a perfect match for the side cover screws.
Posted
Hi, When you are dealing with a stuck phillips screw, before you mess up the head, put a little valve grinding compound on the screwdriver bit. Really helps them grip without slipping up and rounding out th e heads. Al Eden
ehertzfeld
Posted
quote:
Originally posted by Al
Hi, When you are dealing with a stuck phillips screw, before you mess up the head, put a little valve grinding compound on the screwdriver bit. Really helps them grip without slipping up and rounding out th e heads. Al Eden
Great tip Al! never heard of that. Elon
ZippoVarga
Posted
After many broken and stripped out screw heads I finally learned a little trick that's about 80% effective and reduces the chance of boogerin up the head of the screw. Using a combination of every one's idea, the impact driver, compound and making sure the driver fits as snuggly as possible. Put your shoulder into it, lightly tap the end of the screw driver while TIGHTENING the screw first....this will break the oxidation bond that's so common with using ferrous (magnetic steel) with aluminum. If you do booger up the screw slot a little it's on the tightening direction and not the loosening. If you do happen to strip out the head of the screw and you have a dewalt or black and decker cordless chances are it has an impact option to keep from over tightening screws. Use that in conjunction with a REVERSE twist drill bit. This usually takes out the 20% that the other methods fail with. A little heat can also help but dont get things too hot. I use a trigger type soldering iron put at the point I want heated up. Aluminum dissapates heat much faster than iron so keep that in mind when dealing with stubborn screws in aluminum. Ya gotta work faster in other words with aluminum when heating. Dont heat the screw head, this will cause it to swell. You want the flywheel to relax a little so the screw may come out easier. Just some ideas to help! Good Luck!
Posted
Hello, I have used a manual impact screwdriver tool many times with great results. It of courses drives the screwdriver head into the head of the screw and gives it a quick rotation at the same time. Good Luck. Also is the best tool ever, PB Blaster and a propane torch. Warming the metal allows the PB Blaster to penetrate better.
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