Cylinder liners frozen with liquid nitrogen before putting in
Cylinder liners frozen with liquid nitrogen before putting in
(OP)
Hi all,
I recently had an MGB block where one cyl. liner had to be replaced being scuffed.
The machine shop always will rehone the next cylinder as well as pressing in the liner will bring deformations in the cylinder next to it.
We discussed freezing the new liner in liquid nitrogen and preheating the block so it can be put in with minimal pressure,avoiding the next cyl. to be rehoned(this is a race engine,hence i do not like to rehone if not necessary)
The guy from the machine shop is hesitant because he is afraid that ice will form on the wall and that water will be brought in between the cyl. and the liner causing later problems.
What is Your feeling about it?
Thanks for listening!
Dirk/Antwerp
I recently had an MGB block where one cyl. liner had to be replaced being scuffed.
The machine shop always will rehone the next cylinder as well as pressing in the liner will bring deformations in the cylinder next to it.
We discussed freezing the new liner in liquid nitrogen and preheating the block so it can be put in with minimal pressure,avoiding the next cyl. to be rehoned(this is a race engine,hence i do not like to rehone if not necessary)
The guy from the machine shop is hesitant because he is afraid that ice will form on the wall and that water will be brought in between the cyl. and the liner causing later problems.
What is Your feeling about it?
Thanks for listening!
Dirk/Antwerp





RE: Cylinder liners frozen with liquid nitrogen before putting in
ISZ
RE: Cylinder liners frozen with liquid nitrogen before putting in
I think the machinist makes a valid point about the possibility of ice damage. I suppose you could rig up a zero-humidity workspace to mitigate that risk. Is it worth the effort?
Is the machinist willing to warranty work that he does, using unfamiliar techniques that you have requested?
Mike Halloran
Pembroke Pines, FL, USA
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
Dirk
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
Wet sleeves can be either. They can use press fit and sealant or slip fit and O rings to seal the water surrounding the sleeve from the crankcase and the engine oil.
Sometimes the interference is required to hold the sleeve in place, but mostly a step at the bottom and the cylinder head at the top hold them and the interference is simply for heat transfer or sealing of water.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Cylinder liners frozen with liquid nitrogen before putting in
Meanwhile we went for a ,004" press fit.The reason for my asking is also that we noticed that when taking the engines apart, the sleeves usually sank down ,001", even with a ring at the bottom or with flange on top. The B-block already has a tendency to sink in between the cylinders, just a little. Net result is gasket problems with high compression engines under race conditions.
Dirk/Antwerp
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
Dirk
RE: Cylinder liners frozen with liquid nitrogen before putting in
RE: Cylinder liners frozen with liquid nitrogen before putting in
I have the same experience as Todd, But I have also assembled many of gears by thermal, sub zero treatment in liquid nitrogen & never had issues. yes there will be ice build up, but if the mating part is thermally heated, it will dissipate any ice or water.
I have never observed or heard of problems.
It is easier to work with as Todd suggested.
Fredrick
Have you observed micro cracks by using liquid nitrogen, I know of heat treaters that have used it for years.
Mfgenggear