Engine rebuild thread - for fun only

Post by **937carrera** » 17 May 2019, 16:53

This is just for a bit of fun

What do you think this is out of and what has gone wrong (why is it in bits)

Post by **itchyfeet** » 17 May 2019, 17:22

Lawnmower

Post by **937carrera** » 17 May 2019, 18:05

Close, but not close enough yet - and diagnosis ?

Post by **harris121163** » 17 May 2019, 19:29

model petrol car and stuck piston ring

Post by **937carrera** » 17 May 2019, 19:40

nearly half right

Post by **JeffRoo** » 17 May 2019, 21:27

Model aircraft and it crashed

Post by **937carrera** » 17 May 2019, 21:59

Getting colder, in fact downright chilly

Post by **Aidan** » 18 May 2019, 08:31

chainsaw
lack of lube

Post by **Titus A Duxass** » 18 May 2019, 09:00

Strimmer - it's Donald.

Post by **937carrera** » 18 May 2019, 09:23

I think that's close enough to declare Aidan the winner, though Titus was getting even closer on the equipment side.

Not a chainsaw, but a leaf blower, many of them they use the same Husqvarna 25cc two-stroke engines anyway.

It was given to me as a non runner "you like messing with stuff don't you"

Having checked the presence of spark and fuel, I did a compression test, only 4 bar so I pulled her apart.

The piston ring was stuck in the groove, which is the point at which I took this photo.

Using diesel and a very small screwdriver, I got the ring released, the groove was full of carbon deposits. Having removed the ring I cleaned it up with more diesel and a green kitchen pad, the inside edge of the ring was rough with carbon. I was just giving it a final clean on the inner edge when I applied a bit too much pressure and snapped the ring

Knowing the previous owner, I am doubtful that they will have mixed the fuel correctly, the top of the combustion chamber is black with deposits too. I suspected no oil, but looking at the deposits I now suspect too much oil. There's only minor scuffing on the piston. They are so tiny, 34mm I think.

I think I'll just order another ring (£3.48 aftermarket), reassemble and see if I have a runner.

..... of course if others have different thoughts, post away, as I have never done much with two strokes

Post by **itchyfeet** » 18 May 2019, 10:09

937carrera wrote: leaf blower

Pointless, noisy and environmentally unfriendly things, best leave it broken.

Post by **937carrera** » 18 May 2019, 10:15

itchyfeet wrote:
Pointless, noisy and environmentally unfriendly things, best leave it broken.

Not completely true, good diagnostic tool for finding micro leaks in exhausts.

Oh, and it has a suck mode as well as blow

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Engine rebuild thread - for fun only

Engine rebuild thread - for fun only

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Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only

Re: Engine rebuild thread - for fun only