Cooked chainsaw.

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Cooked chainsaw.

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Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 10:56 am Post subject: Cooked chainsaw.

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: 34535
Location: Hereford

Posted: Tue Sep 16, 14 11:01 am Post subject:
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: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 11:10 am Post subject:

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

Posted: Tue Sep 16, 14 11:18 am Post subject:
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: 46211
Location: yes

Posted: Tue Sep 16, 14 11:19 am Post subject:
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: 46211
Location: yes

Posted: Tue Sep 16, 14 11:21 am Post subject:
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: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 11:29 am Post subject:

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: 46211
Location: yes

Posted: Tue Sep 16, 14 11:31 am Post subject:
fuel filters?

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 11:57 am Post subject:

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: 25795
Location: Jumping on the bandwagon of opportunism

Posted: Tue Sep 16, 14 12:26 pm Post subject:
Is the spark plug producing a good spark or has the electrode eroded or become dirty?

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Tue Sep 16, 14 1:18 pm Post subject:
...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: 8443
Location: Llyn Peninsular North Wales

Posted: Tue Sep 16, 14 2:15 pm Post subject:
Chainsaws rely on a good crankcase seal so they can maintain a vacuum. Overheating often wrecks the seals.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 2:22 pm Post subject:
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: 46211
Location: yes

Posted: Tue Sep 16, 14 2:38 pm Post subject:
if the piston is chances are the pot is as well,

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Sep 16, 14 5:52 pm Post subject:
On first inspection it looks ok...

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