Onan Teardown help

[elshiv]

Hey Guys, Before anyone points it out.. yes I have been to the Tractor Forum article on "How to rebuild your Onan engine" Yes it's fantastic and very helpful. However I'm stuck in the teardown process at a spot before the Article starts. If anyone could offer some tips or guidance it would be appreciated. I have the Onan out of the tractor finally! I have all of the shrouding completely off. I removed the rear screen and exposed the flywheel. I was able to remove the bolt that holds the flywheel into the Crankshaft but the flywheel it's self will not budge. I am not sure what to do and I don't want to force anything for fear of breaking something. Am I missing something here? Is there some secret bolt or pin holding it in I am not seeing? Also the front PTO will not come off. I have 2 stripped bolts holding it to the engine block. I'm picking up some stripped bolt removal tools tomorrow. However, I can't get the bolt that holds it to the Crankshaft to break loose. Is this a reverse thread or something? Whats the best way to break this seal so i can get the front PTO off and the flywheel off?

[dvogtvpe]

you need a puller to remove the flywheel.

[elshiv]

Originally Posted by dvogtvpe

you need a puller to remove the flywheel.

Would something like this work?

http://www.amazon.com/636-Distributi...eel+puller+set

[elshiv]

Also I know I will need a gear puller and that it has to be really heavy duty for this. are there any recommendations on a good affordable gear puller that will work for getting that timing gear off?

[john hall]

You can't get the PTO bolt in the crank to come loose? Are you using an air wrench? Just curious, what do you mean stripped bolt removal tools?

[elshiv]

Originally Posted by john hall

You can't get the PTO bolt in the crank to come loose? Are you using an air wrench? Just curious, what do you mean stripped bolt removal tools?

don't own an Air Wrench.. looks like I need to purchase one. as for stripped bolt removers. I found these. I'm not sure they will work as the space to get in there is really tight.

http://www.amazon.com/Craftsman-Bolt...d+bolt+remover

[john hall]

Originally Posted by elshiv

don't own an Air Wrench.. looks like I need to purchase one. as for stripped bolt removers. I found these. I'm not sure they will work as the space to get in there is really tight.

http://www.amazon.com/Craftsman-Bolt...d+bolt+remover

So what you are dealing with are stripped heads, not stripped threads. Let me offer a couple of suggestions first if I may. Before you try those removal tools, have you used a 6 point socket? Its pretty rare a 6 point will let the head strip. If a 6pt standard won't grab it, look into driving on a metric socket, 6 or 12 point--whatever fits the tightest. When all else fails try your removal tools. The only time I have had them to work was on bolts with screwdriver slots that were too buggered. Have used them a couple other times on heads that were worn off from something rubbing against it. What you have to watch on those is that they actually screw themselves down over the top of the head, make sure the tool doesn't bottom out against what the bolt is actually holding on. If it does the tool will just slip and shear off more of the head. If possible, post a couple pics of the bolts giving you trouble.

Regarding an air wrench, handy tool to have. For working on lawnmowers a cheap 1/2" drive tool and some 6 point impact sockets should be sufficient. I can't see dropping a ton of money on one just for working on a Cadet.

[Oak]

Elshiv, that is all good info that Dvogtvpe and John gave. I keep an electric impact wrench on my truck for work so if you don't have a compressor an electric one will work too.

Here is a cheap $15 harmonic balance puller that I use to pull flywheels. So far it has worked every time.
DSC01991.jpg

[elshiv]

Originally Posted by john hall

So what you are dealing with are stripped heads, not stripped threads. Let me offer a couple of suggestions first if I may. Before you try those removal tools, have you used a 6 point socket? Its pretty rare a 6 point will let the head strip. If a 6pt standard won't grab it, look into driving on a metric socket, 6 or 12 point--whatever fits the tightest. When all else fails try your removal tools. The only time I have had them to work was on bolts with screwdriver slots that were too buggered. Have used them a couple other times on heads that were worn off from something rubbing against it. What you have to watch on those is that they actually screw themselves down over the top of the head, make sure the tool doesn't bottom out against what the bolt is actually holding on. If it does the tool will just slip and shear off more of the head. If possible, post a couple pics of the bolts giving you trouble.

Regarding an air wrench, handy tool to have. For working on lawnmowers a cheap 1/2" drive tool and some 6 point impact sockets should be sufficient. I can't see dropping a ton of money on one just for working on a Cadet.

I just ordered a Dewalt 20V impact wrench. That should help. As for the heads I'm talking about here is a picture. I was able to get 2 of the 4 bolts out. The cone in the picture is the most stripped one. It's in a very tight spot and I don't have a box wrench that will fit in there. I'm using 12 point box wrenches for everything because I know they hold on better. I am going to pick up a 3/8" box non ratchet wrench at sears in a little bit as that is why it won't fit.

[Sam Mac]

Remove the bolt in the center of the PTO and the 3 nuts that hold the brake to the PTO (in yellow) and you should be able the get that nut off.