Onan Teardown help
 

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? :bash2:

you need a puller to remove the flywheel.

Would something like this work?

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

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?

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.:bash2: 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. :bigthink:

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.

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.
Attachment 66542

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.

https://dl.dropboxusercontent.com/u/...703_102525.jpg

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.

I didn't even think of an electric impact wrench! Certainly a great tool to have. We've got a really old one that we use on rare occasions when we can't get the repair to the shop. It also works great for running up lag bolts in wood.

Hey Guys,
It's been a bit.. I just want to let you all know I'm completely stuck on the Onan right now. I have 2 bolts I can not for the life of e get out. Does anyone know of a Small Engine Mechanic in CT that would know how to work on these engines. I really don't want to screw this engine up and I'm at the point of trying brute force to try to get these bolts off.

OK... I finally got those 2 stuck bolts off!.. Woo Hoo.. man the right tool sure helps. I got a set of these and I was finally able to get those bolts off. http://smile.amazon.com/gp/product/B...ilpage_o01_s00

However I now need to find 2 replacement bolts as these are pretty damaged. Now to get off the electric PTO.

Hey Guys,
It's been a while, SO I got the PTO off! The engine is now at machine shop to get measured out and bored if necessary. By the looks of it I might get lucky and just need a new rod, piston and rings. I'm having them check the journals and what not.
I have a general question, I recently saw a new PTO on eBay that is supposed to be an upgrade. Has anyone had any interaction with these are they any good? They supposedly have twice the torque and run cooler. This all sounds wonderful but the one for the 982 sells for $400, while other ones are just $250. anyone know if one of the $250 ones will fit the 982?
http://www.ebay.com/itm/261596929165...%3AMEBIDX%3AIT

Looks like Sears is selling the same clutch for $249
http://www.sears.com/xtreme-outdoor-...-SPM7657981826

I put one of there clutch's on a 2180 a while ago. very happy with it.

How does that upgrade clutch install? Does it use and of the parts off the old clutch?

As far as I understand its a direct bolt on replacement.

Onan B48G Crankshaft Help!!!!
 

Hey all,
SO I have not posted in quite some time, But I wanted to say hello and ask for a little help.
The shop I took my Onan to called me and they are finally getting around to putting my engine together! :beerchug:, However the original crankshaft is beyond repair. I had a suspicion and I had purchased one cheap on ebay for just incase. Well, I bought what was marked as an Onan B48 crankshaft on ebay last year but it does not fit the engine, it's too big. :bash2:

The problem I'm having is the stamping on the old crank, it reads 170-333(6 or 8). He can't make out what the last digit is. Can someone help me find the correct number, more importantly anyone have a source for a good quality crankshaft? I'm looking on ebay but I'm not sure that they are all in the best of conditions. I really want this to work and restore the Onan. If not I think I may look for an alternative. but I really rather keep the Onan.

Your support is appreciated!

The P220 I purchased had the shaft cut off for the PTO so I used a B48G crank in the P220 block. It is stamped 170-3353. What is the crank # you got off of Ebay? I think I have a guide on all the Onan numbers somewhere.
Attachment 81840

Do yourself a favor and change the oil by-pass spring and install an oil pressure gauge on the tractor. I didn't change the spring and the engine ran with only about 20 psi @ 3500 rpm (okay but on the low side). For now I stretched it until I make another order from Onan and I'm running about 30 psi.

Hey Oak, Thanks for the advice!... SO I'm finally to the point of putting my 982 back together!:beerchug: and as I'm putting everything back on Your comment popped into my head... is there a document somewhere on how to put an Oil pressure gauge on an Onan?