Replacing one wet liner and piston,false economy?

[rumpelstiltskin]

Hi,got a little Renault 5 turbo and i think a little washer got into one of the cylinders,after inspection with camera one piston liner is badly scratched.Is it possible since the cylinder liners are removeable just to replace the one damaged liner and the piston of the same cylinder?Is it a false economy or feasible enough to get a few more miles out of the engin?

[DVandrews]

If you weren't planning a rebuild and one otherwise wouldn't be due then I t is perfectly OK to replace a single liner and piston.

If the cost of the liners and pistons is relatively low then It might make sense to do them all, if it is eye watering then just replace the damaged set.

Dave

[CrutyRammers]

If you've got time, I'd strip it to a short engine and inspect them all closely, then decide how many to replace from there.

[rumpelstiltskin]

DVandrews said:

If you weren't planning a rebuild and one otherwise wouldn't be due then I t is perfectly OK to replace a single liner and piston.

If the cost of the liners and pistons is relatively low then It might make sense to do them all, if it is eye watering then just replace the damaged set.

Dave

Yep, this.Wasn't planning a rebuild! Engine just turns over now without any clatters etc, it just gives a little chuff every couple of turns,like it fires for a second? Sounds exactly like if somebody was stupid enough to put the ht leads on on the wrong order! (Don't ask me how I know this)

[DocArbathnot]

rumpelstiltskin said:

DVandrews said:

If you weren't planning a rebuild and one otherwise wouldn't be due then I t is perfectly OK to replace a single liner and piston.

If the cost of the liners and pistons is relatively low then It might make sense to do them all, if it is eye watering then just replace the damaged set.

Dave

Yep, this.Wasn't planning a rebuild! Engine just turns over now without any clatters etc, it just gives a little chuff every couple of turns,like it fires for a second? Sounds exactly like if somebody was stupid enough to put the ht leads on on the wrong order! (Don't ask me how I know this)

I would expect if just one cylinder was down it would run, albeit badly. Have you done a compression test?

[rumpelstiltskin]

DocArbathnot said:

I would expect if just one cylinder was down it would run, albeit badly. Have you done a compression test?

Im going to do a test, once I find my tester lol.

[Locknut]

DocArbathnot said:

I would expect if just one cylinder was down it would run, albeit badly. Have you done a compression test?

I would agree, if the engine will not run then you've other problems.

Just a tip I recall from when those engines were common: If you try to lift up the cylinder head when removing it there is a danger that you will pull all the liners off their bottom seals. What you do is hit the head sideways first to break any adhesion between the head and the liners.

[rumpelstiltskin]

Locknut said:

I would agree, if the engine will not run then you've other problems.

Just a tip I recall from when those engines were common: If you try to lift up the cylinder head when removing it there is a danger that you will pull all the liners off their bottom seals. What you do is hit the head sideways first to break any adhesion between the head and the liners.

I read about that just last night, you leave a central head bolt in and tap the cylinder head at the end so the head spins round horizontally first, instead of lifting head up right away.Im sick about this, car was running so well too damnit.