Cylinder & Piston for a Wilesco

[PackmuleParticipant @packmule]

Just finished making a replacement for my engine and have a clearence between cylinder and piston of 0.04 is this ok or is it too much ?

Prior to soldering and a little oil to test it blows the end cap off which is a tight push fit.

cheers

Bob

[PackmuleParticipant @packmule]

[jason udallParticipant @jasonudall57142]

Sorry Bob.. I have no direct knoledge of the wilesco but mamod pistons/cyclinders always seemed loose to me.

if over tight than it won't run , if its loose it will run ( loosing steam yes but will run) , if it has the kind of seal you seem to have cold and both are brass then should still work hot ( if dissimular metals then a check for relative expansion rates might be in order)..

I remember a "rule" for small engins..if the piston will fall under own weight "unchoked" but oiled and will make "pop" noise when pulled out of choked cylinder then thats ok….

Best of luck

[roy entwistleParticipant @royentwistle24699]

0.04 what ?

[nigel jones 5Participant @nigeljones5]

is that .04 mm or inches!!

it must be mm…brain now in gear!

I would go for .0005" which is 0.0127mm

[PackmuleParticipant @packmule]

OK.whoops

Its 0.04mm

Thanks for the advice

[JC Uknz 1Participant @jcuknz1]

I use O rings for this situation and am satisfied when it pops if quickly withdrawn from cycliner.

[John RuddParticipant @johnrudd16576]

0.04mm is approx 1.6 thou..

~Ideally you would lap the cylinder and the piston…

It should work fine if the steam consumption isnt excessive.

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