Holed Piston

[turnipsock]

I took out the spark plug and moved the pistion to the top of the stroke. I can see a small hole right in the middle of the piston and I'm guessing that this is not a 'feature'.

I get a bit of compression but nothing like I would expect. The engine doesn't feel quite right when I pull the starter rope.

Without my power saw I'm going to have use my mums heating allowance to buy logs.

Does anybody have any knowledge of repairing power saws?

 

[guydewdney]

no - but those reciprocating saws in B&Q are v cheap and V good....... took a w116 450SEL6.9 apart with one the other day - so I bet it would sort out you and a log or two.....

 

[television]

is it a chain or reciprocating saw. I have 4 electric chain saws
What make is it, makes a huge difference. I sold a petrol chain saw yesterday at my recycling center for £20 working, still one left don't know what is wrong with that one.

Malcolm

 

[turnipsock]

It's a Huskavana chain saw. I'll have to go and look at the number/type though.

It looks like I could get the head off and swap the piston easily. The hard bit will be tracking down a new part and a head gasket.

It may not be worth my while as new saws seem pretty cheap.

 

[television]

It's a Huskavana chain saw. I'll have to go and look at the number/type though.

It looks like I could get the head off and swap the piston easily. The hard bit will be tracking down a new part and a head gasket.

It may not be worth my while as new saws seem pretty cheap.

Huskavana spares are not cheap, and the same can be said for the saw.
If as you say the head will come off, not too bad a job. you cant of coarse use a ring compressor but should be easy enough to get the rings through the bore. Avoid all of the cheap saws they don't last. try the link. any problems I can get one sent over from Sweden or pick one up in the spring.
I can ask my local man what kind of job it is to do.
Malcolm



http://www.husqvarna.co.uk/?url=/node2169.asp?frames=false

 

[turnipsock]

Isn't the internet great? Pity we can't get this sort of stuff for the car...

http://weborder.husqvarna.com/order_static/doc/HIPL/HIPL1990/HIPL1990_I9000021.pdf

I have a 51, I suppose that is like a C Class in the chainsaw world. I wonder if I can upgrade to a 55? It is 4 better.

Next problem is where to buy the parts.

No worries about the ring compressors, it's just another use for tie wraps.

 

[television]

On the site I gave you, tell them what you want and they will sort it out.

I will ring my friend in the morning and ask him how much and how hard

Malcolm.


Re web great, not sure as without I would be in bed now where all good people should be

 

[turnipsock]

I will ring my friend in the morning and ask him how much and how hard

It looks straightforward. Looks like I need a piston, head gasket and an exhast gasket. If only all engines were this simple, no messing around with cam shafts or cooling systems.

The whole internet thing breaks down with the interface to the real world. I can't work out where my closest dealer is. You would think Argyll would be closest. Campbelltown is well over 100 miles of very bad roads away. Mull involves a ferry! You would think in a country covered by trees...

 

[television]

Short of putting a piece of chewing gum or blue tac in the hole the piston is going to cost you £52, gaskit head £1.82 all plus VAT they keep it in stock
there is a 51EPA model as well, I think the last one I sold was the EPA, do not know what the difference is. I can post it to you if wish or have problems

I bet you need this like a hole in the head.

Must be a common chain saw problem, every one that I pick up has no comp.

Malcolm

 

[996jimbo]

The cheap solution is a nut and bolt (and washers) through the hole in the piston.

But I suppose you'd still have to replace the gasket so may as well do a proper job.

 

[television]

The cheap solution is a nut and bolt (and washers) through the hole in the piston.

But I suppose you'd still have to replace the gasket so may as well do a proper job.

the gaskit only cost £2.00

I was thinking on the lines of welding but I do not know how much distortion would take place. Nut and bolt, good idea if hole is clear of the little end shoulders. the other way is to to drill the hole and tap it, and fit a screw with locktight,one could with a taper tap make the thread very tight then grind off the head of the screw to clear the head. If the piston was put in the oven for ten mins, and the screw went into the freezer it would never come out
Maybe it would be possible to counter bore a little

I don't think it is worth spending £70 on bits, I bought a nice one 3 weeks ago with brakes for £25 and sold it next day for £50

Malcolm

 

[turnipsock]

I got side tracked tonight and didn't get a chance to take the head of the saw. Any idea how much a new 50cc husky costs?

Do you need some sort of qualification to be able to buy a power saw these days?

 

[television]

I got side tracked tonight and didn't get a chance to take the head of the saw. Any idea how much a new 50cc husky costs?

Do you need some sort of qualification to be able to buy a power saw these days?

you have a few postings above this and prices also ideas.

I understand from some circles that you do need a chain saw cetificate

Malcolm

 

[television]

http://www.abbeygardensales.co.uk/subprod/husqvarna-chainsaws-0000620.aspx


these people do not ask for certificates

Malcolm

 

[turnipsock]

http://www.abbeygardensales.co.uk/subprod/husqvarna-professional-chainsaws-0000621.aspx

It looks like the saw I have is £400+ saw, so the £50-£60 repair might be worth it.

I see that you can get saws with heated handles now...and I thought lumberjacks were tough.

 

[television]

http://www.abbeygardensales.co.uk/subprod/husqvarna-professional-chainsaws-0000621.aspx

It looks like the saw I have is £400+ saw, so the £50-£60 repair might be worth it.

I see that you can get saws with heated handles now...and I thought lumberjacks were tough.

£64 + potage for bits, got to be worth it then. if you cant get near you, I can post to you

Malcolm

 

[guydewdney]

Power output: 6.2 kW / 8.4 hp

wow!

 

[television]

Power output: 6.2 kW / 8.4 hp

wow!

Put one one each wheel =33.6 hp

I lived in Sugar lane Bourne end for 6 years. At least you can have everyone on a piece of twing

malcolm

 

[turnipsock]

I took the saw apart today, it's only a five minute job. There is nothing to these engines.

The good news is that the piston doesn't have a hole in it.

The piston ring has broken. The ring has then caught the transfer port and jammed itself into the piston...hence no compression.

I managed to break the ring some more trying to get it out, so now I'm left with two small bits of ring jammed in the piston.

The piston is scored but I might get away with just cleaning it up and fitting a new ring (once I get the last bits out)

 

[television]

The thing that breaks the rings is when the groove in the piston has worn allowing the ring to tip or twist. the groove needs to be at 90 degrees to the wall of piston, usually when worn there is a burr around groove on the piston.

The scoring on the piston does not matter.

Malcolm