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Cooked chainsaw.

 
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Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 10:56 am    Post subject: Cooked chainsaw.  Reply with quote    

I think I have had my chainsaw running too lean and overheated it.
It cut out, smoking gently from places wot it doesn't normally smoke from.
It hasn't seized and it still has good compression, but shows no inclination to fire again.

My basic infernal combustion handbook says you need three things for an engine to work: fuel, compression and ignition. I seem to have all those, so what's happening?

I'm guessing that it's time for the spanners and a complete strip down though...

Nick



Joined: 02 Nov 2004
Posts: 33683
Location: Hereford
PostPosted: Tue Sep 16, 14 11:01 am    Post subject: Reply with quote    

Like comedy, don't you also need timing? My cooked one was simpler, it simply seized and I needed a new piston and ring.

Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 11:10 am    Post subject: Reply with quote    

Nick wrote:
Like comedy, don't you also need timing?

There is that, but I think that is pretty much fixed on a chainsaw.
Certainly there is no grounds to think it has moved at all.

BahamaMama



Joined: 21 Sep 2006
Posts: 2315
Location: Away with the fairies
PostPosted: Tue Sep 16, 14 11:18 am    Post subject: Reply with quote    

It would be interesting to know make and circumstances..

Himself had one that cooked on normal use on a very hot day. When he took it to the supplier they said it was a known problem.

dpack



Joined: 02 Jul 2005
Posts: 32959
Location: yes
PostPosted: Tue Sep 16, 14 11:19 am    Post subject: Reply with quote    

i recon take it to bits will reveal the problem ,if not put it back together and see if it works.

dpack



Joined: 02 Jul 2005
Posts: 32959
Location: yes
PostPosted: Tue Sep 16, 14 11:21 am    Post subject: Reply with quote    

even though you have a spark if you watch for it could the leccy be leaking via muck etc(which might explain the smoke from odd places as well) and therefore not sparking in the cylinder?

Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 11:29 am    Post subject: Reply with quote    

BahamaMama wrote:
It would be interesting to know make and circumstances...

Husqvarna 2100XP. I was planking with it. Was going really well before it stopped...

Just tried it this morning and it fired and ran for a brief moment, but not again (so far)...

dpack



Joined: 02 Jul 2005
Posts: 32959
Location: yes
PostPosted: Tue Sep 16, 14 11:31 am    Post subject: Reply with quote    

fuel filters?

Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 11:57 am    Post subject: Reply with quote    

dpack wrote:
fuel filters?

Seem to be clear enough. It is a thirsty brute, I doubt it'd go from running full bore to completely blocked that quickly.

Treacodactyl
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Tue Sep 16, 14 12:26 pm    Post subject: Reply with quote    

Is the spark plug producing a good spark or has the electrode eroded or become dirty?

vegplot



Joined: 19 Apr 2007
Posts: 21297
Location: Ynys Môn
PostPosted: Tue Sep 16, 14 1:18 pm    Post subject: Reply with quote    

...or electrode partially melted. If running lean you may also have damaged the piston. Sounds like time for a strip down, the chainsaw not you.

RichardW



Joined: 24 Aug 2006
Posts: 8414
Location: Llyn Peninsular North Wales
PostPosted: Tue Sep 16, 14 2:15 pm    Post subject: Reply with quote    

Chainsaws rely on a good crankcase seal so they can maintain a vacuum.

Overheating often wrecks the seals.

Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 2:22 pm    Post subject: Reply with quote    

I've popped the exhaust off and the piston is visibly scored... I reckon that's a positive diagnosis...

dpack



Joined: 02 Jul 2005
Posts: 32959
Location: yes
PostPosted: Tue Sep 16, 14 2:38 pm    Post subject: Reply with quote    

if the piston is chances are the pot is as well,

Hairyloon



Joined: 20 Nov 2008
Posts: 14817
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Sep 16, 14 5:52 pm    Post subject: Reply with quote    

On first inspection it looks ok...

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