drsrst2zvh

Rebuilding a z12xe corsa sxi engine and basically somebody else in the workshop has compressed the lifters in the vice to empty them without me asking. I dont think they are meant to be compressed or emptied. When i put the car back together it sounds fucked. Tappety rattling like a tractor. will this eventually quieten down ive had it running for over 10 mins already.

saph4be

it is generally a good idea to slightly commpress them but they may have fucked them if they done it too much!

drsrst2zvh

Well they compressed them in a vice?? i presume they have shagged the springs in the lifters?

Turbo Zetec

iTrader: (1)

With those hydraulic posts, they can get stuck if you compress them too much and would cause the rattle. They should be springy after you've squeezed the oil from them.

cossie.con

In my experience with lifters in general you should strip them down(as in remove the collect from the top an upturn them) as just squashing them in the vice will push all the crap out past the seals hence knackering them in the process

Mik

Turbo Zetec

iTrader: (1)

with most lifters thats the easiest way, but these are small hydraulic posts that most people cant take apart without buggering them up. they're a bit like a minature version of the cvh, or vauxhall 8v ones

drsrst2zvh

So I take it just leave it running and eventually they will quieten down?

Turbo Zetec

iTrader: (1)

i'd take the rocker cover off to see if any have stayed compressed... if they have, either replace them, or carefully unstick them if you can work out a way

get it sorted before you rev it up and it throws a rocker off

Oranoco

Or say it's the 3 cylinder as they sound like that when they're working properly. lol

Turbo Zetec

iTrader: (1)

its the 4 cylinder version of the very same engine

steve4i

no need too compress them with them being roller tappet's they MIGHT eventually quite down but it will take a while

botters

iTrader: (2)

they wont quieten ive been there and done it myself, only after compressing them was i told never to do so by a vauxhall tech lol! id just replace them they are not overley exspensive

markk

iTrader: (2)

I would never build a hydraulic tappet head without compressing them, get all the old oil and crap out, its a hard lesson to learn when you rebuild one and then the tappets stay open holding the valve off its seat = no compression.

it will quieten down once its done a few warm cycles, i did the same engine a few weeks ago.