KR-1S.co.uk Forum

hi folks

After removing the barrels to solve the problem with my leaking
cylinderhead (exhaust gases in the cooling system) I found the following
damage:

piston rhs


piston lhs
the scratch right from the trace is from dismount


cylinder rhs


cylinder lhs


There are traces of a piston seizure on both barrels at exactly the same
location.
Right a bit less than on the left side.
The LHS-plug is a bit brighter than the RHS one, but still ok.
The pistons look accordingly: left one is a bit brighter than the right one.
As can be seen on the pics the pistons have left some aluminium onto the
barrelsurface.
There are no scratches whatsoever, the barrels' surface feels smooth.
The rest of the barrels' surface is without any fault.
However on both barrels the inlet near LDP has been polished quite
intensively.
I've seen this phenomenon on RD and TZR barrels, where this isn't
problematic at all.
I haven't noticed this small seizure happen at all.

My questions:
How do I remove this aluminium from the barrels?
With sandpaper or should I try to use an abrasive solution? Which one?
Or do you assume the barrels' coating has been damaged?

cheers,
Dirk

Thanks to Charles for translate =D>

Best way to remove it is with a solution of 20% Hcl in water. Just don't get it on your hands or on the un plated areas of the barrel and make sure you wash it off with plently of water.

The pickup on the pistons is quite common. I'm guessing they have a fair few miles on them so a top end rebuild is propably on the cards as well. BTW (not sure if I told you this) I use Wellseal to seal the head gasket. If its good enough for a 500MW Steam turbine then its good enough for a head gasket.

Hi elf,

thanks for the info.
i have no experience with nikasil cylinder.
only with cast iron.
to remove alloy from cast iron we use sodium hydroxide.
the pistons and crank are ~3100 miles and both cylinder ~8700 miles old.
to few miles for damage...


After a second view i found a defect on the plating.
the defect is very little (~2x3mm (~0,12x0.8 inches))
i think the cylinder need new coat??



Dirk

hi

i have send the old cylinder to bdk.

dirk