pistons

gil · Dec 27, 2010

right after a failed atempt of cutting the bottom of the con rod off. so, im going to drill the top of the piston on to the con rod and try and brake it off the piston.

do you think it will work?

Pikey · Dec 27, 2010

gil said:
right after a failed atempt of cutting the bottom of the con rod off. so, im going to drill the top of the piston on to the con rod and try and brake it off the piston.

do you think it will work?

No because the Gudgeon Pin is hardened steel If you start hammering chiseling etc.. You'll score the cylinder liner and then ya completely fooked.

Pikey · Dec 27, 2010

Drop the Crank and do the job properly..

gil · Dec 27, 2010

isnt dropping the crank a big job though, i can lift the engine out because i had my lift robbed

Pikey · Dec 27, 2010

Crank will come out with engine in situ. drop sump. and drop crank

gil · Dec 27, 2010

isnt it a pain in the arse do do with the engine in though?

gemsdad · Dec 27, 2010

gil said:
isnt it a pain in the arse do do with the engine in though?

hire a lifting crane then.

filfan · Dec 27, 2010

how will it come out with the flywheel attached. would you not have to remove the gearbox first.

how come you couldnt get the bottom of the con rod? what technique did u use?

filfan · Dec 27, 2010

would lend my crane but its bit far to go. check ebay out

gil · Dec 27, 2010

filfan said:
how come you couldnt get the bottom of the con rod? what technique did u use?

I triedto cut it like you said, but i only have a angle grinder and jnr hacksaw, both too big to get in to the small space. im just looking for a mini reciprocating saw online

johnny curt 1 · Dec 27, 2010

the easiest method in my mind would be to turn the crank so the gudgeon section is to one side of the conrod then knock the piston down the barrel as far as itll go then saw the conrod off as close to the piston as possible then use a 2ft section of scaff tube underneith the piston with the conrod inside the scaff tube and use a bottle jack to lift the whole thing upwards to 1" below the top of the block then pour half a cup full of wd40 into the cylinder and leave it fer bout 1 hour then come back and jack the bugger right out the top of the cylinder slowly and carefully and it should come out no fuss

johnny curt 1 · Dec 27, 2010

gil said:
I triedto cut it like you said, but i only have a angle grinder and jnr hacksaw, both too big to get in to the small space. im just looking for a mini reciprocating saw online

just get a new 12"hacksaw blade and put plenny of tape at one end for a handle making sure the teeth are facing the homemade handle and concentrate useing the n saw on the back stroke rather than forward youll get through it mate theyre only alloy

gil · Dec 27, 2010

i dont want to knock it down too far, the rings will get stuck at the bottom of the bore and i wont be able to push it back up

filfan · Dec 27, 2010

your best bet would be a hacksaw blade holder try Irwin Mini Hacksaw 24Tpi 12" (300mm) from screw fix £7.48 plus get some spare blades. will take a while but cheaper in the end

jamesmartin · Dec 27, 2010

piston will definately not come out of bottom ,you will have to remove gear box ,fly wheel housing ,flywheel brg caps crank etc and cut off with angle grinder,crank brg surface is very easy to damage and debris through cuttin or grinding ,better to save original piston if you can as its alreadt the right size and rings are run into bore ,if you do need new piston needs measuring accurately as size varies and there is supposed to be only around 1 thou clearance rings also need to be removed and gapped in bore if piston is replaced,any damage to bottom of bore as long as not cracked and isnt in the swept area of ringfs can be filed or ground back with dremel or such

Pikey · Dec 27, 2010

buy a reciprocating saw from B&Q use it to cut thru conrod and then take it back and get a refund.

filfan · Dec 27, 2010

even if you knocked a ring down which i doubt u will it will just snap off when u pish it up.

johnny curt 1 · Dec 27, 2010

redhand said:
buy a reciprocating saw from B&Q use it to cut thru conrod and then take it back and get a refund.

he he good ol b&q hire shop lol

johnny curt 1 · Dec 27, 2010

jamesmartin said:
piston will definately not come out of bottom ,you will have to remove gear box ,fly wheel housing ,flywheel brg caps crank etc and cut off with angle grinder,crank brg surface is very easy to damage and debris through cuttin or grinding ,better to save original piston if you can as its alreadt the right size and rings are run into bore ,if you do need new piston needs measuring accurately as size varies and there is supposed to be only around 1 thou clearance rings also need to be removed and gapped in bore if piston is replaced,any damage to bottom of bore as long as not cracked and isnt in the swept area of ringfs can be filed or ground back with dremel or such

im sure its supposed to be 10 thou clearance as 1 thou will sieze in the barrel but then again i could be wrong

filfan · Dec 27, 2010

redhand said:
buy a reciprocating saw from B&Q use it to cut thru conrod and then take it back and get a refund.

yeah I have hired some stuff in my time from b&q they come in handy. maybe they should be more realistic with the pricing

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