Author Topic: Stihl 020T /Ms 200T case split  (Read 2037 times)

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Offline Al Smith

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Stihl 020T /Ms 200T case split
« on: November 29, 2011, 06:02:31 am »
I did this topic on another site and thought there might be some interest in it .

Actually it's Toms 020T which has a 200T case .The thing was leaning out so I changed the bearings seal crank shaft from the original cases .

What I found out was the crank had excessive play both lateraly plus up and down on the clutch side .I checked 4 cases .My stock and souped 200 .The original 020 cases plus the replacement case I installed early in the spring .Found problems on two .More later on that .

Of all the Stihls I've done this is the easiest case to split I've found yet .Most Stihls use shrink fit ball bearings on the crank .This one is roller bearings .Peel it down to just the engine and it's six case bolts .A little tap with a rubber hammer and it comes apart easy as pie .

Once the crank is out it's easy to knock the seals out with a blunt screwdriver going above the bearing real gentle like .Heat the bearing pockets up and drive the bearings out .Install in reverse ,install the seals and bolt the whole thing back together

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Offline Al Smith

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Re: Stihl 020T /Ms 200T case split
« Reply #1 on: November 29, 2011, 06:06:41 am »
Now what the problem was on both this case plus my little super bee .The thing is built with an 8 roller roller bearing with captive hard retainers instead of ball bearings .Ball bearing will take sideways thrust where rollers aren't so good at it .The actual bearing with this hard plastic material seats against two shoulders on the crank and relies on this material to act as a thrust wall .Well it works for a time .The plastic wears out and it gets sloppy

So after high hours usage the crank wobbles to and fro .The seals get rubbed on the rough carbon like material outside the witess marks and heat up and leak .See the pic of the crank shaft ,it's obvious .The seals are most likely viton instead of the usual buna n .Viton is some tough stuff but not as limber as buna n .They can heat up which will swell them.They cool off they shrink .

That plus the fact they are single lip seals instead of the usual double lip seals I think causes lean run conditions .Usually people just keep opening up the jets and continue on with what they are doing until it gets to the point like these two that lean out after 5 minutes or less .

It's only speculation on my part but I believe that in addition to carb problems this little thing here might also be a leading cause of the failure of these saws after some extended usage .It would cost probabley 70-80 bucks to redo the crank case with bearings and seals if you did it yourself .However if a shop did it you'd have half the price of the saw tied up .

Offline Cut4fun .

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Re: Stihl 020T /Ms 200T case split
« Reply #2 on: November 29, 2011, 06:59:43 am »
Wonder why those type of crank bearings.

Interesting A,l nice to see deeper inside those.
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Offline Al Smith

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Re: Stihl 020T /Ms 200T case split
« Reply #3 on: November 29, 2011, 07:47:26 am »
Good question but I have no idea of the answer .Most likely less drag than a ball bearing but more prone to failure IMO .

I also think that because usually the things burn up the P and C most never get split .You can find complete cases on flea bay  crank shaft and all for under 50 bucks .

Look at it like this though whatever the case of failure I think this is the first I've ever seen anybody discuss a case split on this model on the net before .I'd imagine though as to not be out done someone will do it other places given enough time . ;)

Offline Cut4fun .

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Re: Stihl 020T /Ms 200T case split
« Reply #4 on: November 14, 2012, 01:35:14 pm »
Al I noticed Larry posted some good info on a replacement 200T carb without acc pump.

Quote from: chainsaw-57

200 T Carburetor

Hey Guys,  Try 1129 120 0650.
 
  Fully adjustable, non-EPA, no accelerator pump.

  Much less expensive, probably will not notice lack of pump.

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Offline Al Smith

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Re: Stihl 020T /Ms 200T case split
« Reply #5 on: November 15, 2012, 09:00:34 am »
Thre's been an erronious idea that all 200T carbs were the accelerater type which has caused a lot of problems world wide .However these were only used on later in production models .

Myself as well as Adam Clark in California have done internal repairs on the non pump type using red loctite around the welch plugs etc with pretty good success .

There's a gent in France that posted some place ,TH maybe that showed how to disable the pump type carbs .

Couple years ago I sent a carb to Stihl in Va Beach to be analized at the request of Eddie A. ( Stihl # 1) who was on Stihl staff .Their findings was it did not have internal  cracks but there was a slight amount of internal leakage .That carb was sent to me originally from Australia because no one could figure it out .I thought it had a crack in the fuel chamber but according to Stihl it did not .However it displayed the same symptoms as the accel pump models .I had ran it on both a stock 200 plus the souped 200 and it fell flat on both saws .I had not done the red loctite fix on that carb before I sent it .

Offline Cut4fun .

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Re: Stihl 020T /Ms 200T case split
« Reply #6 on: May 21, 2013, 01:16:06 pm »
Al I couldnt find the thread where we had talked about aftermarket 200T p+c kits. So I'll post it here for now.

http://chainsawrepair.createaforum.com/index.php?action=profile;u=948 member here sales these.  http://www.weedeaterman.com/product_p/wemhywayms200.htm  under $100

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Offline brokenbudget

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Re: Stihl 020T /Ms 200T case split
« Reply #7 on: May 21, 2013, 02:06:08 pm »
that kit does look very good.
when I grow up, i wanna be an adult.

Offline Al Smith

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Re: Stihl 020T /Ms 200T case split
« Reply #8 on: May 23, 2013, 08:53:45 pm »
They were selling them in England about 6 months ago .I figured it was just a matter of time before they got to this side of the pond .

Offline Cut4fun .

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Re: Stihl 020T /Ms 200T case split
« Reply #9 on: May 23, 2013, 09:02:17 pm »
baileys has them too.  http://www.baileysonline.com/itemdetail.asp?item=CKN+200T&catID=

NWP Piston and Cylinder Assembly (40mm) for Stihl 200T Chainsaws

     Stihl MS 200, MS 200T
    Replaces Part Number 1129 020 1202, 1129 020 1206
    Bore 40mm
    Stroke 28mm
    Displacement 35.2cc
    Rings 40mm x 1.5mm
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