Does the engine have any compression? I know it won't have much being a side valve but it should have some.
John
John
Advice for non starting mower
- Thread starter ipbr21054
- Start date
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Yep you do - your thumb
Stick it over the plug hole and get someone to crank the engine over....you shouldn't be able to restrict the air escape.
John
Stick it over the plug hole and get someone to crank the engine over....you shouldn't be able to restrict the air escape.
John
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Not unless you have a spare finger up the plug cap!
John
John
God bless the electric mowers and extension leads...
Was there any indentation in the key at all, even a small one can cause a spark but no start result
Still no go.... Any result from the compression investigation?
Is throttle being held open by the governor when in the start position?
John
Any result from the compression investigation?Is throttle being held open by the governor when in the start position?
John
Not good - the compression should blow your finger off so something isn't right there. (If you are cranking the thing fairly speedily.)
Look for oil traces around the cylinder head gasket area, and then its cylinder head removal time.
John
Look for oil traces around the cylinder head gasket area, and then its cylinder head removal time.
John
I think maybe the woodruf key broke & say damaged a valve.
A new key was fitted but didnt fix the issue.
I then take it apart to see a new key.
This still leaves the vale issue.
I suppose i just undo the 7 / 8 bolts around the plug hole & thats the head off.
A new key was fitted but didnt fix the issue.
I then take it apart to see a new key.
This still leaves the vale issue.
I suppose i just undo the 7 / 8 bolts around the plug hole & thats the head off.
Valves won't be damaged on a side valve engine - not due to flywheel faults anyway.
However, you are looking for a dislodged valve seat - holding a valve open - when the head comes off.
John
However, you are looking for a dislodged valve seat - holding a valve open - when the head comes off.
John
Head is now off.
As the barrel is horizontal i see a pool of oil at say 6 o clock.
I turn the engine over slowly by means of the blade & see the Inlet "large" valve open & as the piston goes through its cycle the inlet closes then i see the exhaust open then close.
The vales open & close fine.
The fact that there was a pool of oil does that mean rings ? if so the compression is passing the rings & going down the bore as opposed to being compressed.
As the barrel is horizontal i see a pool of oil at say 6 o clock.
I turn the engine over slowly by means of the blade & see the Inlet "large" valve open & as the piston goes through its cycle the inlet closes then i see the exhaust open then close.
The vales open & close fine.
The fact that there was a pool of oil does that mean rings ? if so the compression is passing the rings & going down the bore as opposed to being compressed.
That's a good diagnosis of yours....any sign of scratches or scoring on the cylinder wall that could indicate oil starvation in the past?
John
John
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