056 jug hex socket size

[harrygrey382]

Basic question here, but what size hex socket/ allen key do you need for the jug bolts on a Stihl 056. I don't have a normal allen key long enough, and can't guess from that range/darkness...
Thanks

 

[harrygrey382]

4mm maybe?

 

[Lakeside53]

Replace them with Stihl torx!

 

[galde]

Stihl key

T-27

 

[harrygrey382]

yes sir!

 

[rxe]

I don't have an 056 - but the ones on an 070 are 5mm. 4mm would be pretty skinny for head bolts.

Now for a follow up question. How do you guys torque them properly? I've just ordered a hideously expensive snap-on 3/8th drive 5mm extra long hex bit, which is the only thing I have found that is long enough to reach in. The other alternative was a Wiha torque head, but that cost even more.

What is the school solution please, teacher?

 

[harrygrey382]

I don't have an 056 - but the ones on an 070 are 5mm. 4mm would be pretty skinny for head bolts.

Now for a follow up question. How do you guys torque them properly? I've just ordered a hideously expensive snap-on 3/8th drive 5mm extra long hex bit, which is the only thing I have found that is long enough to reach in. The other alternative was a Wiha torque head, but that cost even more.

What is the school solution please, teacher?

uh oh, i was assuming 4mm cos quite a few saws seemed to have M5 bolts, which are normally 4mm. But can someone confirm this (Lakeside... )?
I was planning on tightening them be feel, before the thread/head yield point but still tight. Any problems with this?

 

[Lakeside53]

I'd use a torque wrech... unless you have a very good sence of feel... 4mm?. Sounds right, but I just grab the one that fits!

I would not put the hex screws back in - replace them with Stihl torx.

 

[harrygrey382]

yeah ok. If you don't mind, what torque?

 

[rxe]

Just one more point - whatever fastening they are, they'll be full of crud. I used a length of MIG wire to flick the crud out so that the key could engage with the socket. If it only partially goes in, you are at high risk of rounding off the socket.

 

[harrygrey382]

yeah good tip, will do

 

[Dan Forsh]

IPL says your head bolts are M6, so I suppose a 5 mm allen head. Personally I don't have the means to use my torque wrench on head bolts so it's always best guestimate for me. For the torx heads I have a tee handle t27 these have a bit of spring in them so I tend to tighten until I'm springing. All good to date

 

[Big feller]

I seem to remember the head bolts needing a 5mm key. I use a Wiha system 6 bit held in a deep 6mm socket to attach a torque wrench. Grinding the top off a long hex key would do the same job.

 

[Dan Forsh]

Strange coincidence that all but one of the people adding to this thread up to now are from the UK??

Come on lads, all together in the words of Colin Welland "The British are coming"

 

[harrygrey382]

Strange coincidence that all but one of the people adding to this thread up to now are from the UK??

Come on lads, all together in the words of Colin Welland "The British are coming"

guess there must be something british about 056 head bolts maybe...(although it's a toss up whether i'm british or aussie).

Big Feller, what's a Wiha system 6 bit? Also, what is the torque for these bolts?

 

[rxe]

Taken from the 070 Service manual:

M8 Socket-Head Screws: 9.8 Nm
M6 Socket-Head Screws: 9.8 Nm
M5 Socket-Head Screws: 6.9 Nm

They'll the same for the 056 for the same screws.

 

[Big feller]

Big Feller, what's a Wiha system 6 bit? Also, what is the torque for these bolts?

056 torque figures:

Crank nut ignition side 30Nm 22 lbft
Crank nut clutch side 35Nm 26 lbft
Clutch carrier 50Nm 36 lbft
Spark plug 30Nm 22 lbft

Wiha system 6 is an interchangeable blade screwdriver system that happens to have a 6mm shank that will just clear the holes on the 056 head. You can get the blades separately from Wiha, but it would probably be cheaper to grind the top off a long Allen key.

 

[rxe]

The hideously expensive hex key has arrived. One thing you can say about snap-on: delivery is damn quick. With this, I can use my 3/8 torque wrench to get it right:

Now, the purists amongst you might wonder why I didn't bother to clean the cylinder before taking it off. That is because this one belongs in the bin - here's a shot of the piston:

I think that the previous owner ran it without a filter for a while. There is a whole load of damage to the ports, and the intake side of the piston is scuffed to hell. It has "eaten" about half an inch of ring too - there is impact damage to the top of the piston, so it looks like it spat it out. The crankcase looks very clean. Dan - this is the 070 we were discussing just after Christmas.

 

[harrygrey382]

damn, nice tool. Thinking I might weld an extended 5mm hex key up, or grind a slot in an old socket so it can grab t handles. And I do need a 3/8 torque wrench, gotta shop around a bit for something that goes as low as 9 Nm though. What sort do you have?
That piston looks nice... where you getting a replacement cylander? You going for an aftermarket piston? If so what make? (May well be looking for a replacement 056 piston)
Thanks
Harry

 

[Lakeside53]

Taken from the 070 Service manual:

M8 Socket-Head Screws: 9.8 Nm
M6 Socket-Head Screws: 9.8 Nm
M5 Socket-Head Screws: 6.9 Nm

They'll the same for the 056 for the same screws.

I'll check the 056 manual at work tomorrow, but 5mm CYLINDER screw are normally 10nm, and 6mm is 12-14.