have been offered a series for resto needs a new piston is it easy ish?

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BA90James

BA90James

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have been offered a series (unknown whether it is a 2 or 3 yet :eek:) for resto needs a new piston is it fairly easy to replace a piston? i will have help am just wondering just how difficult it will be :confused: :(
 
the person im getting it from has pistons ready to be put in and if it needs other things they'll be bought as just wondering whether its a stupidly hard to replace pistons?
 
not really but you will need a good toolkit and shell bearings etc......

are you taking the head off or going to attempt it all from underneath?
 
remove head, drop oil, drop sump, undo big end, push out piston, undo little end may need heating etc as will be interference fit or well put together, push piston out from below with something, I used piece of wood and a hammer to knock it up slowly, new rings on piston and onto con rod unless supplied on one, into clamp, insert, reverse process for taking out
 
Freelaner said:
not really but you will need a good toolkit and shell bearings etc......

are you taking the head off or going to attempt it all from underneath?
Click to expand...

cant get it out without removing crank, easiest to push it out of top of block

may as well renew shells but if not just make sure the old ones go back on in the right orientation and rotation
 
Dr_evil said:
cant get it out without removing crank, easiest to push it out of top of block

may as well renew shells but if not just make sure the old ones go back on in the right orientation and rotation
Click to expand...

yep very important that last bit they are matched cos they were machined together.
new shells are peanuts so a good time to replace them, smother them with oil when fitting.
i've only ever done it from the top but never removed the crank to do it though.
 
Freelaner said:
yep very important that last bit they are matched cos they were machined together.
new shells are peanuts so a good time to replace them, smother them with oil when fitting.
i've only ever done it from the top but never removed the crank to do it though.
Click to expand...

crank only has to come out if doing from the bottom, specially on the V8 even though I dismantled the thing fully you could only get half the pistons out through the bottom (easy to do so as no sharp edges) the block casting doesn't allow for them all to come out

Use black or red assembly compound to put back together and job done :)
 
BA90James said:
replace the shells whilst doing the piston change* that better for ya rob?
Click to expand...
you need to measure bores and pistons to match them ,its not quite as simple as just bunging a new one in ,it may well be better to get 4 new over size pistons and get it bored and honed to new piston size
 
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