Starter ring gear

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Unfortunately the starter ring gear for this car may not be obtainable.  I am looking into the possibilityof repairing it.  Has anyone ever attempted to build up the teeth on a ring gear and then machine them down ?What was your filler wire choice ?Cheers !-Graham-Mechanical EngineerAutosport Mechanic/Fabricator
Reply:I would look into flipping it before building it up. Also most that I've seen have bevels on the front edge of the teeth to help the pinion engage.  Definitely take it off the flywheel before welding. I doubt it would stay tight enough to hold if you try building it up while stretched on the flywheel.  Shrink fit it back on when done.Millermatic 252XMT 304'sDynasty 280DXHypertherm PowerMax 1250Miller Trailblazer 302 EFIOptima PulserXR feeder and XR Edge gun and more athttp://members.dslextreme.com/users/waynecook/index.htm
Reply:Some times there will be multiple bad spots depending on the number of cylinders.   If only one bad spot it has been stoping at against the cylinder with the most compression.  I have removed rings, rotated a quarter turn and shrunk it back on.  Dan
Reply:I'd be trying the flip it over method myself... It's hard to tell from the pic, but it doesn't look like there's any bevel built into the teeth, so it shouldn't be a problem. Out of curiosity, what's it in..?
Reply:I have one in use that was much worse than that. On this diesel engine the starter dint disengage and chewed the heck out of the ring gear until the pinion was trashed. I replaced the pinion and then filed the teeth until the pinion would have a smooth engagement. It has been working fine ever since. So long as you have enough engagement into the ring gear it is just a matter of getting it to where it will engage smoothly. I think I spent an hour filing the ring gear. First clean the burr off of the tooth, then bevel the edge of each tooth to a vee. This was done with the flywheel on the engine through the starter hole.It sure beat doing a tear down.  Otherwise you need to remove the flywheel, heat the ring gear until it expands enough to remove. You need to be careful not to add so much heat the the ring gear discolors, as the are usually hardened. I think the guidline on the last one I did was 400-500 degrees max. You also need to try to keep the flywheel cool. Remove and flip as fast as you can, then let it cool. Then you will need to bevel the teeth, as the back side of them is rarely beveled.
Reply:I'm with Wayne. Flip it. Lot of life left.Arcon Workhorse 300MSPowcon 400SMTPowcon SM400 x 2Powcon SM3001968 SA200 Redface1978 SA250 DieselMiller Super 32P FeederPre 1927 American 14" High Duty LatheK&T Milwaukee 2H Horizontal MillBryan
Reply:Is the car make and model a secret?Flip it and no need for buildup.
Reply:My purox welding manual has a way of doing this with brazing rod. Not sure if that is strong enough, or specifically what type of rod was used, but they show bulding up chewed gears with a torch.Miller Multimatic 255
Reply:Flip it.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:Flip it. Done it on many pieces of old equipment when parts where no longer available. Only takes a few minutes.  I have never filed the teeth to a point but it wouldn't be a bad idea1982 miller blue star 2E ac/dcHarbor freight flux core posVictor oa
Reply:Originally Posted by Louie1961My purox welding manual has a way of doing this with brazing rod. Not sure if that is strong enough, or specifically what type of rod was used, but they show bulding up chewed gears with a torch.
Reply:thanks guys, I appreciate the responses.  Flipping the gear is a great idea and more than likely the approach i will take, unless my parts guy has a break through.  The car is Italian : )cheers-Graham-Mechanical EngineerAutosport Mechanic/Fabricator