Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: Drf255 on May 18, 2012, 06:06:45 am

Title: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on May 18, 2012, 06:06:45 am
Hi to all and thanks in advance.  I'm new to the site. 

I'm working on an 066.   I bought it used and it ran terribly.  After examination, I noticed that the clutch side of the crank was very wobbly.  I tore it down to the crankcase and found around 2mm of side play on the crank. 

I ordered new bearings, a gasket kit and carb kit. 

Now for the many questions. 

Im separating the crankcase with a gear puller and it seems to be working, but I'm a bit nervous that he force may crack the case where I'm pulling from. 

How is the head gasket removed?  Does the piston need to come off?

The cylinder, piston and crank/pistion bearings all look great.  The cylinder is shiny, has no scores, but also zero cross hatching.  Do I leave it be, or try to scuff it with some fine emery or a brake cylinder hone?  How should the rings be offset/rotated for assembly?

What do I coat the new crankcase gasket with for assembly?

My flywheel is metal and has a keyway marked "X" and "P". Which is the proper slot to install on the keyway?

I know it's alot of questions and I thank you all for any help you give me. 

Al
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Cut4fun . on May 19, 2012, 06:50:03 am
Welcome.

Which slot was flywheel in when pulled?

Which ignition does the saw have? That will decide which slot to use.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on May 19, 2012, 08:12:31 am
If I knew which slot, I wouldn't be asking. 

How do I determine the ignition type?  It has no points, just an aluminum flywheel and a magneto assembly. 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Cut4fun . on May 19, 2012, 08:21:05 am
If I knew which slot, I wouldn't be asking. 

 

If I see that a flywheel has 2 slots I mark from the outside with permanent marker before removal.   

Read the coil what does it say for type?
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Tzed250 on May 19, 2012, 04:23:25 pm
The piston has pins that will orient the ring gaps. No need to prep the cylinder bore. If the case half mating surfaces are clean no coating is needed on the gaskets. Do you have an 066 service manual? If not then a PDF copy could be e-mailed to you.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on May 20, 2012, 05:59:35 am
I do not have a manual. 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Al Smith on May 20, 2012, 08:02:22 am
The easiest method I've  found to split the cases is to heat the bearing pockets with a heat gun .Heat ,pry a bit ,heat .Don't get in a hurry ,you'll be allright .

To reassemble there's several methods .You can install the bearings on the crank then put the whole mess in the freezer for a couple hours then heat the pocket on one side of the case,install ,then do the other side .

Another as outlined in a few Stihl manuals is to install the bearings in the case halfs first then heat the inner race using a soldering iron .Of course freeze the crank as before .If the bearings have a plastic cage I'd be a little leary using this method .

These are just two ways I've used but I'm sure there's other methods depending on what tools you have .

In my opinion a little well placed heat in conjuction with a frozen part is less stressfull to the assembley than forcing the press fit bearing with some type of clamp .
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Tzed250 on May 20, 2012, 11:33:21 am
I do not have a manual.

PM me your email addy and I will try to send you one.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 13, 2012, 06:01:30 am
Thanks for the help.  It's back together, has spark but wont run.  I believe i picked the wrong flywheel keyway and will be adjusting that tonight.   

My saw came wth no sprocket retaining washer or clip.  Where can I purchase these?  I also need the stock outer dog ear. 

Thanks. 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 13, 2012, 07:17:37 am
I get these parts at the local Stihl Dealer

The E-clip and washer for the rim sprocket are standard items, the same, on most larger chainsaws
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Cut4fun . on June 13, 2012, 10:10:09 am

My saw came wth no sprocket retaining washer or clip.  Where can I purchase these?  I also need the stock outer dog ear. 

 

If you dont have time to run back and forth to dealer and dont mind waiting on shipping and know what you want. You might try these guys. 

You can call and order too to make sure you get your order right.     http://www.northwoodsaw.com/store/
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 14, 2012, 04:47:06 am
I'm in touch with an eBay seller who will get me the circlip and washer. 

Next problem, Oiling. 

I set the pump up correctly (I think).  Changing the slot on the flywheel fixed the not running problem, it runs strong.   

The problem now is that the oil is seeping out of the clutch area and does not come out of the chain area.  Where is the oil supposed to come out of when everything is working properly? 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 14, 2012, 07:26:35 am
The pump supplies oil to a slot behind the bar but above the bar mounting studs.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 14, 2012, 08:32:34 am
I have no oil coming out of that slot ???
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 14, 2012, 08:53:27 am
There's a rubber hose that goes from the back of the pump into the oil tank. These often leak where the pump fits over the end of the hose.

The spiral worm that turns the pump has a wire arm that engages a slot in the clutch bell. If the arm is not engaged then the pump will not be running.

Trace the oil path from the pump to the oiling slot in the bar mount.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 14, 2012, 09:18:36 am
it seems to pump oil, just not too slot.  The pickup tube is in place.  The small tit coming out of the pump fit into a small recess in the crankcase casting.  There was no gasket there, so i applied a small amount of copper formagasket aroung the opening, enough to not get into oil hole.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 14, 2012, 10:20:26 am
I think there is a rubber ring that goes in there?

1122 649 5000
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 22, 2012, 06:20:18 am
Got the O ring (which is more of a short piece of tube) amend the oil flows correctly now. 

Had to replace the entire fuel cap.   I could not get the gasket alone, but at $8 I can be a sport. 

Can the ring that the chain goes into that slides over the sprocket (?name) be placed on either way?   I placed it with the numbers designating pitch on the outside, but the owners manual shows it the other way-the clover leaf pattern is facing out.  Is this reversible, or should I disassemble and turn it around?

This saw is ONE MEAN MOFO by the way.  I have the factory 20" bar on it that seems ridiculous. 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Al Smith on June 22, 2012, 06:37:52 am
Most times they run the 66's with a 36" bar around these parts .
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 22, 2012, 10:53:35 am
Got the O ring (which is more of a short piece of tube) amend the oil flows correctly now. 

Had to replace the entire fuel cap.   I could not get the gasket alone, but at $8 I can be a sport. 

Can the ring that the chain goes into that slides over the sprocket (?name) be placed on either way?   I placed it with the numbers designating pitch on the outside, but the owners manual shows it the other way-the clover leaf pattern is facing out.  Is this reversible, or should I disassemble and turn it around?

This saw is ONE MEAN MOFO by the way.  I have the factory 20" bar on it that seems ridiculous.
My Rim sprokets are mounted with the numbers out

I have several bars but the 24/25" or maybe a 32" seems pretty good for the wood you would be using this chainsaw on?

With the 066, they made a lot of changes to this chainsaw model during the 90's. There are several technical bulletins describing the differences and for example what coils match what flywheels to maintain the correct timing etc. I have a 066 and it is a Duke's mixture of different year parts that span the whole flat top era. The last 066 version wasn't much different than the first 660 version.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Al Smith on June 22, 2012, 02:19:48 pm
From what I've seen on that model the relatively early ones before the EPA stuck it's nose into the mix were the hot runners .

My buddy Tom the tree man had an early 066 rebuilt that would run neck and neck with that big Homelite in my avatar and that's saying something .His  MS 660 is a mere shadow to the saw it replaced .
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 22, 2012, 02:28:47 pm
Here is a picture of my Flat Back that I had at the recent Ohio GTG

(http://img.photobucket.com/albums/v11/jamesirl/P9110114-1.jpg?t=1334962350)
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Al Smith on June 22, 2012, 11:56:36 pm
Aah yes ye olde 460 rescue saw D-Handle .Hath saved many a finger tip . ;)I subscribe to that method myself .
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 23, 2012, 09:14:58 am
That 066 has the early cylinder with no compression release.

With the rescue handle, you can get a full grip and the lack of a compression release is not too noticeable.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on June 23, 2012, 04:25:59 pm
Where could I purchase a handle like that?

My saw must be a later version of the early model.  I have a curved top, compression release and an aluminum flywheel.
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: 660magnum on June 23, 2012, 04:55:43 pm
The handle is from a Stihl 460 Rescue Saw

They should be available from the Stihl dealer?

Snow machine and snow blower starter handles are made like thyis
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: man of stihl on June 23, 2012, 05:23:02 pm
The handle is from a Stihl 460 Rescue Saw

They should be available from the Stihl dealer?

Snow machine and snow blower starter handles are made like thyis
Yes. and they are only about $5 bucks a piece... ;)
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Al Smith on June 23, 2012, 07:03:46 pm
I buy them 3 or 4 at a time .
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on July 04, 2012, 06:50:39 am
I just wanted to thank everyone again for their help. 

I finally found the correct outer dog ear and the saw is complete!

Just need to order one of those "D" handles now. 
Title: Re: Stihl 066 Repair/Teardown/Reaasembly
Post by: Drf255 on October 07, 2012, 04:54:28 am
Help!

Just used the saw on my first wood procurement and the handle that disengages the chain brake snapped. 

Does anyone here have one off a parts saw?

PayPal?

Can barter for some aluminum welding if needed.