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Installing crankshaft in 206 engine

J

JS Sleds

New User
What is the best way to install the crankshaft in a 206 engine? When I took it out I pulled out the rear bearing carrier then lifted the crank out of side opening but going back together I'm worried about scratching the journals. IT manual doesn't help much. Thanks Jeff
 
Something you could do is wrap a heavier shop rag or pieces of old towel around the rod journals and duck tape them to hold them in place. I havent taken a crank out of a 206 yet. I believe there is something in an older ZA manual about just that. I'll have to see if I can find it.
 
Crank seems to come out back best. Never had any luck through side. Prepare to skin a couple of knuckles! Probably would be easier with two people. It would take alot to scratch journals. Be patient.
 
JS thanks for asking this question, I'm planning on replacing gaskets on my 206 out of a 4 star and if I need to pull the crank I'll know how. But will have to take the crankcase off of the stand since I have it mounted from the rear. So Alan and Molinegb is it better to lay the engine on its side to do this or just leave it upright? thanks chris
 
If I remember the picture correctly in the manual I was referring to, I thought it was laying on its side, and to move the crank to the rear enough for it to clear the front and then take it out the side. I think that is what was in the book, of course the book isnt always right lol. I will have to see if I can find it.
 
I haven't look in the book yet as I always forget to look at it in the shop. I have a 445 manual and an I&T manual so I should have enough guidance between those two and you guys here at yt. Also does a guy pull the jugs/cylinders together or one at a time, I remember somebody saying something about a coolant tube at the bottom of the jugs. chris
 
I havent had a later 206 apart but Im guessing you have to pull both up some to get the tube out from in between them. I know MM always advertised blocks, cast in pairs so you could do one or both. It worked ok with the R and Z motors but not with the later 206s.
 
When I did my Jetstar a few years back i had the engine too on a stand and I laid it on it's side. Seems to me it was a lot easier to control it and lowering it into place. The biggest pain was pulling one of the guide dowels for the flywheel out for the back of the crankshaft.
 
Unless you remove all the studs there is a tube that runs between the blocks as well as the heads. So make it easier on yourself and plan on pulling them as pairs or at least that's what I did.
 
Number one rule. Always change coolant tubesand O rings. They cannot be reused with any kind of success.
 
Instead of pulling a dowel pin when removing the rear main bearing holder, I cut the end of the one at a 45 degree angle with a cut off disc in 4-1/2 inch grinder. Just make sure you cut the correct one. There is still plenty left to align things properly. Before the advent of the cutoff wheels, we just ground the end of the dowel.
John
 
The factory 445 manual I have just tells what parts you need to take off to remove the jugs. It does say to leave the heads together with the adapter plate to remove, and then separate the heads. The IT manual says the same thing for the heads, but to take the adapter and set it back on the studs with at least four nuts to pull the jugs together to remove them as one assembly. Thanks again guys. chris, Stanton Nebraska
 
Will try and order the tubes tomorrow, my regular dealer decided to retire or was offered a price he couldn't refuse, think they were near retirement age, hope I have good luck with the next dealer, if not will call Welter's? My dealer was Johnson's out of North Bend Nebraska. I called him on the overhaul gasket kit and alot of misc. stuff and he always had what I needed, alot better than the Deere dealers I usually work with. I have the orings but guess I'd wait and see what the tubes looked like, should have got those from Johnsons also. thanks chris
 
I always put tubes in blocks and heads first. Just lower them as a pair. They aren't that heavy to by hand even with pistons in.
 
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