Engine rebuild - piston liners
Hi gang,
I'm going to be doing a bottom end rebuild soon and was wondering if anyone had an opinion on the seals for the bottom of the piston liners. Is it a good idea to replace these also since everything will be apart or is it better to leave them be as long as nothing is leaking?
Thanks a lot!
AlfaBeta
I'm going to be doing a bottom end rebuild soon and was wondering if anyone had an opinion on the seals for the bottom of the piston liners. Is it a good idea to replace these also since everything will be apart or is it better to leave them be as long as nothing is leaking?
Thanks a lot!
AlfaBeta
Liners are not pressed into the block, they are only mounted with a fine tolerance slide fit. So they normally slide right out with light hand force. But sometimes they can get warped, i guess due to overheating, causing them to get stuck. On my engine i had one such troublemaker. With a piece of wood and a hammer it came out after a while.
Engine rebuild-piston liners
A successful way of removing the liners is by fitting a top compression ring to one of the old pistons and fitting it upside down the bore all the way down till the ring expands past the bottom of the sleeve. Then you can punch it out with a block of wood and a mallett. You may want to use some penetration oil and soak the liner/block joint overnight before attempting the removal. I have used this method on the 4 cyl engines, just had to cut out a little bit of dome on 2 sides to clear the bearing webs. I am not sure about the v6 engines but its worth a look. I am sure I got this idea a long time ago from this site!
Engine rebuild-piston liners
A successful way of removing the liners is by fitting a top compression ring to one of the old pistons and fitting it upside down the bore all the way down till the ring expands past the bottom of the sleeve. Then you can punch it out with a block of wood and a mallett. You may want to use some penetration oil and soak the liner/block joint overnight before attempting the removal. I have used this method on the 4 cyl engines, just had to cut out a little bit of dome on 2 sides to clear the bearing webs. I am not sure about the v6 engines but its worth a look. I am sure I got this idea a long time ago from this site!
Im surprised to here that they are bored in place. I was thinking they could be bored and honed like a single cylinder motorcycle.TS_turbo wrote:best you can do is to remove liners clean them and liners's nests(!@#) put new seals and may be some high T RTV silicone for peace of mind ..reinstal liners and bore them with torque plate ...
-Tom P.
yes i know ... but after my friend f*&ck brand new set of forged NA pistons, we measured cylinders when non torque honed ... all ok .. but when instaling head-miror torq plate and tightnen it to specs , difference was 0.04 mm and this is for solid cast iron block ...for turbo aplications where is plenty of clearance there is no mater .. but if u put some tight clearance NA forgies or hypereutectics , proper way is to bore liners torqued in block