How to replace the head gear

if starter motor runs (hear it??) but doesn't turn engine , then it needs to be replaced also at same time , the gear it contacts with on flywheel edge ,needs to be visually inspected (easy with starter removed) for any missing or bent teeth , as a engine this old is bound to have some worn or missing teeth, if gear is missing teeth or are very worn (teeth looks like a shark fin with hook to them) then engine and transmission will need to be separated to be replace the gear , most shops will just remove engine to allow for this , but this isn't always nessacary

Check your front sprocket for missing teeth. I have broken all of them off and it would only slip at times making a horrible sound and I have also had every other tooth go missing. This is all due to a wore out chain. You need to check you chain for wear by pulling it away from the rear sprocket. If you can pull it away from the sprocket and see a fair amount of space between the teeth, replace the chain. Also both sprockets at the same time. Repost another question if more problems

It sounds to me like there may be wear/broken teeth in the gears. Does it hammer OK? If not could be the teeth on the armature as well. You need to strip it and examine the gears for meshing correctly. If a gear has worn/broken teeth it is best to replace the gear it meshes with at the same time as replacing the broken gear or else you may find they break again after a short period.

look for loose or missing starter bolts,the starter drive pinion gear either worn or damaged or flywheel gear teeth worn or broken. noise you hear if it sound like starter grinding noise check starter mounting bolts could be loosen or 1 missing or drive pinion gear or flywheel gear teeth worn or broken.

I would be inclined to replace the broken/worn gear and only any other bearings/bushes that show wear, which is probably none. I would remove any contaminated grease (it usually remains close to the failure point) and add more grease if necessary. The gear is a fuse gear and designed weaker to fail if the machine is overloaded so the gear that runs on it is unlikely to be damaged.

sounds like the gear box the teeth are chewed up from lack of lubrication have to take it off and check the teeth and fill it back up with oil make sure none the gears are missing teeth sounds like lost some teeth

You can remove starter and check to see how the teeth look on the alternator. You will also need to inspect the flywheel to be sure that the teeth on the flywheel are not broken or missing. Your best bet would be the starter, because if the flywheel is missing teeth, you will need to remove the transmission to get to it. Good Luck.

Hi..my name is Keith..and i restore 9N's,2N's and 8N's....and to replace the ring gear..you split it there at the back of the engine..and its kind of a big job..so i would check the starter 1st..to make sure its not a starter problem..i hope this helps..if not please write back..i love tractor problems

Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

I turned the gear arround and put it on backwards
doitdel
I still need a new gear since it is still missing a couple of teeth