Stihl 084 broken crank

[Robin Wood]

has anyone experienced this kind of crank failure on such big saw ?

saw last ran on 30" hardnose full comp semi chisel with rakers abit knocked down on river gum hardwood

 

[hseII]

Wow Robin.

It's nice you have another.

 

[Robin Wood]

actually its at my dealers place, he has some pile of used saw/parts
he took those pics for me, i dropped the saw at his place after i found some unusual idling behaviour
and we found the clutch side end moved in an oblong fashion when the rope is pulled
turned out the crank cracked and came apart when he pulled it out
i guess im lucky it didnt snap while running, cant imagine the damage that would have happened

 

[Big_Wood]

i haven't experienced it before but i've seen it on here before. think it was a 880 though and the guy caught it when it was just a crack. can't remember who it was though.

 

[Robin Wood]

i haven't experienced it before but i've seen it on here before. think it was a 880 though and the guy caught it when it was just a crack. can't remember who it was though.

if its from milling i could imagine, bad batch maybe ?

 

[axeandwedge]

if its from milling i could imagine, bad batch maybe ?

Two 084's, one 088 ,066 none of these saws were used for milling.
But these saws never had it easy either.

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[Robin Wood]

Two 084's, one 088 ,066 none of these saws were used for milling.
But these saws never had it easy either.

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wow and i thought i had a bad day

 

[TreeswingerPerth]

I had the same failure with an 044 , new crank was close to 300 gbp .

 

[axeandwedge]

wow and i thought i had a bad day

Got more somewhere,had a collection of Brazilian 038 crankshafts.

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[Mad Professor]

I've not seen this on saws. Have seen dirt bikes spit out lower rod bearings which work their way up through the transfers and wreak havoc.

Is the lower rod bearing failing first or just a crack developing on the pin? Was the P/C O.K.?

 

[axeandwedge]

I've not seen this on saws. Have seen dirt bikes spit out lower rod bearings which work their way up through the transfers and wreak havoc.

Is the lower rod bearing failing first or just a crack developing on the pin? Was the P/C O.K.?

P/C were all OK on the crankshafts I posted,the 088 ignition module came loose and had a fight with the flywheel,
The two 084 saws had locked up crank bearings and the big end bearing and Con rods were blue,I guess the sudden stop at full noise was too much.
The Guy that bought in the 084's has a pile of broken and busted up saws
Truly a sad and sorry site.




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[Robin Wood]

my dealer did mention rude stop and run cycle will eventually cause some of these failures

 

[teacherman]

P/C were all OK on the crankshafts I posted,the 088 ignition module came loose and had a fight with the flywheel,
The two 084 saws had locked up crank bearings and the big end bearing and Con rods were blue,I guess the sudden stop at full noise was too much.
The Guy that bought in the 084's has a pile of broken and busted up saws
Truly a sad and sorry site.




Sent from my HTC_0P6B using Tapatalk

my dealer did mention rude stop and run cycle will eventually cause some of these failures

I wonder if this is why they say to let the saw idle a couple of minutes after use, to allow the engine itself to regain its equilibrium with air moving through and across it. Maybe it's not just for the electrical components.

 

[mdavlee]

my dealer did mention rude stop and run cycle will eventually cause some of these failures

Save all the 084 cranks.