The mighty stihl 064 and early 066

[K Mueller]

I thought I'd show you guys this - I bought this parts saw from a member here, it's an original 066. It's vintage circa late '93/early '94. The case has never been cracked open.

Over the years I've mentioned that Stihl used sealed bearings from the factory for a short time - here's the pudding:

That’s cool! Thanks for sharing

 

[jacob j.]

In a chainsaw, it seems like you’d want the crankcase side of the bearings to be exposed to fuel/oil mix to get lubrication under hard loads running hot. Seems like they would be getting less with that side closed off?

I think the idea was to keep debris out of the bearings. Even though they're shielded bearings, some lubrication from the fuel mix would "burp through."

Actually the opposite happened though in terms of debris - fine sawdust would make its' way in there and the bearings would get packed tight with it and fail.

There were a lot of debris-related bottom end failures early on and Stihl's engineers finally figured out that it was an air filtration issue.

 

[huskyboy]

I think the idea was to keep debris out of the bearings. Even though they're shielded bearings, some lubrication from the fuel mix would "burp through."

Actually the opposite happened though in terms of debris - fine sawdust would make its' way in there and the bearings would get packed tight with it and fail.

There were a lot of debris-related bottom end failures early on and Stihl's engineers finally figured out that it was an air filtration issue.

Thanks JJ, makes sense to me. Very interesting info!

 

[Basher]

My early 066 has shielded bearings in it, they are not sealed as such and the mix is thin enough to get past the shield. Like JJ says the air filters need to be maintained meticulously to prevent debris from getting past the filter especially around the sealing edges, some saws airfilter covers just did not apply enough pressure to seal the best, shimming and hard grease helped a lot.

 

[Glock37]

3. 064 all ported 2 by a monkey and 1 rattler did


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[K Mueller]

3. 064 all ported 2 by a monkey and 1 rattler did


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Awesome

 

[deye223]

HMMMMM stainless dawgs ...... either way they look clean ......

 

[Glock37]

HMMMMM stainless dawgs ...... either way they look clean ......

Thanks too @ leadfarmer Rodney aka Hot Rod !


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[K Mueller]

I am thinking an OEM one is in the neighborhood of $150.

Just FYI if your still looking. Two poly flywheels just posted on eBay. Both have coils with... $60-65

 

[drf256]

Just FYI if your still looking. Two poly flywheels just posted on eBay. Both have coils with... $60-65

Are they any different than the 046 poly?

 

[K Mueller]

Are they any different than the 046 poly?

I believe so but not entirely sure? I think the inside diameter of the 046 flywheel is smaller like a 064 and metal flywheel 066. The Poly has a larger inside bore.

 

[blacksmith]

Are they any different than the 046 poly?

I believe so but not entirely sure? I think the inside diameter of the 046 flywheel is smaller like a 064 and metal flywheel 066. The Poly has a larger inside bore.

If I am correct in my thinking the 046, 064 and older 066 flywheel side crank are the same diameter.
The 066 flywheel that I got off of Kyle fit perfectly on the end of an 046 crank.

 

[huskyboy]

A 046 poly flywheel on a 064 would be cool...

 

[blacksmith]

A 046 poly flywheel on a 064 would be cool...

Not sure if the thickness of the flywheels are the same or not.

 

[K Mueller]

A 046 poly flywheel on a 064 would be cool...

@Willard has tired it on a short case 066. I was going to try a arctic 046 flywheel on a 064 because I couldn’t find a arctic 064 flywheel for my build. Willard said it’s a PITA to get the dogs to line up for the rewind. It would be pretty cool though

 

[BuckthornBonnie]

The bearings are the same size and configuration throughout the series (064, 066, MS-650, MS-660). The part number for the PTO side bearing has changed because
they changed the design of the cage a couple times. Somehow, word got out on AS that the poly flywheel saws use larger bearings and that's not the case. It's the flywheel
side oil seal that's larger.

This was a result of jms and other *pretty boy “builders” saying the bearings were different.

No one with extensive 1122 builds would claim it... and I know you and I have corrected a few along the way.

 

[BuckthornBonnie]

@Willard has tired it on a short case 066. I was going to try a arctic 046 flywheel on a 064 because I couldn’t find a arctic 064 flywheel for my build. Willard said it’s a PITA to get the dogs to line up for the rewind. It would be pretty cool though

ChainsawJim did one as well.

 

[Willard]

Hey guys I'd like to help you out here with the 064-066/046 conversion, but it's been so long ago. I'd have to see if I got some of my notes in the rewind spool mounting mod. I have since sold the 046 parts.

My family and I are presently in Charleston, South Carolina.
Beautiful 85°F here today. We really love this place. Great people, great food and lots to see here. Could easily retire here if I could.

 

[jacob j.]

Are they any different than the 046 poly?

Way different. The taper for the crank is different, the 660 flywheel is thicker than the 046/460 and has the large starter interface/recess.

 

[jacob j.]

Hey guys I'd like to help you out here with the 064-066/046 conversion, but it's been so long ago. I'd have to see if I got some of my notes in the rewind spool mounting mod. I have since sold the 046 parts.

My family and I are presently in Charleston, South Carolina.
Beautiful 85°F here today. We really love this place. Great people, great food and lots to see here. Could easily retire here if I could.

I've thought about retiring to the southeast myself. I was on the Gulf Coast for three months working on Deepwater Horizon and had a great time. I was mainly working between Pensacola and Orange Beach.