given i'm still at like two introduces the uh... cylinder dialed board age fill
this tool allows us to accurately read
the dimension of the cylinder
from it's original point measured in the engine up to and beyond
it's maximum
bore specification manufacture lays out
now their maximum specification will be the warrant permissible limit
saw if it is telling us that
our maximum limit
isn't five inches one hundred and twenty two thousand
that means if we read that measuring or beyond on this
deeds
that the cylinder is actually defective and cannot go back into service at that
point they will be replaced because it's beyond
the maximum amount of the mention of the manufacturer last
so talking about the tool itself
we have a serrated edge here on this tool breaking this point
this allows us to hang on to the tool
so that were measuring
we can move it in and out of the cylinder up and down the cylinder
and we have to have a bit of finance for working this tool
one of the times what technicians make a mistake with with this tool because it
is a dial board each
and it's only reading on this scale half-hour increments
up to twenty five thousand seven inch positive for part b_ twenty and twenty
thousand manage positive or negative on the scale
so depending on where you sit the measurement
and calibrated
you know read either positive or negative in again up to the maximum
diameter that the manufacture
permits
so we have been able feeds side we had the involved phase here
that when we move that
it allows the skill at the top
to rotate
this is relative to the movement in the cylinder as we rocket back-and-forth and
move it up and down
in the prescribed areas for measurement
ingi
package itself for the container that it comes in
it tells us is that we used each points and the numbers that we use relative to
either the metric or to the imperial measurement for special occasions of
that particular cylinder as david manufacturers this one engine in
particular looking at is the detroit sixty series engine
and the manufacture of prescribes a method of how we're going to political
about doing this
it gives us dimensional measurements across three different axes
which is basically going to be the nature and the
uh... major and minor thrust area and then of course is the front and back
words movement of the pistons in the border
accountability factor also wants to
uh... make it relative to the movement of the piston rings in this owner bore
so it gives us dimensions atty
at b an etsy
to determine how far that piston is movement
moving based on dream travel
that's the area that we're going to get the where at the cylinder wears in three
positions
it where is that the very top of ring travel
where we have the most about of movements of the piston comes up under
compression a loading
goes over top of neutral blow
and then comes down under combustion loading
select tested at the very top of rocks through neutral block and intro to
wallace described as the number of degrees a crankshaft rotation
that the piston remain static
so in that testing goes up and stops momentarily into the great things and
comes back down
think about what happens when we introduced rpm and loading
so now the piston moved out of the very bottom of its travel
and at the very bottom it also stops on neutral ball has to move across the
great and change position the piston piston
allowed to start moving back up
so at the very top of piston travel we have neutral blah with the piston rocks
into the very bottom a travel at bottom dead center the piston rocks again going
across central block so we get a lot of where the very top
subsequent amount of where the bottom and the least amount of where cursed
typically in the very center
of selling their travel
and that's where we have combustion loading and compression loading not as
high
and rpm also has a factor involved there and overall
he begins to space meant
so as a cubic inches increase the friction load increases also
so the manufactured tells us on this particular
spec sheet it
we can have no more than the five inches one hundred and twenty two thousand
subash
okay taking a look at the
cylinder out of the sixty series detroit
so just talking a little bit about the seller in particular
we have a hard liner all rings down here at the bottom one that is missing is
that
coolidge
crevice seal
and it's a very large one
the very large steel help seal the cooling into this area
and this second
oil of rain also hear works in competition capacity with the cooling
crevice rain
and this works as a backup for the calypso the crevice still for the court
system fails
the backup bring prevents
trolling from getting into the bottom end
now by server so we have an will see on the bottom
that prevents lubrication from the bottom end of the engine from coming up
if they're still fails
that second ceo works in competition capacity
to help prevent took uh... oil from getting up into the cooling system
now with the very top of its own there we also have
you really very apt
and detroit what they do is they have been in there so in your box
a small cooley passage drilled on the adjacent side of where this liners sits
in position in the block
that allows court to flow around this particular area
and back out through the cooling system
what that does it provides is additional amount of cooling above piston ring
travel which is right around this area
so from there to the top is we're going to generate the most about a heat from
compression loading and combustion low
so what happens there is if we have that extra volume the co-lead
running around the circumference of this liner
it helps absorb that he and carried out via through the roof uh...
cooling system to the radiator
that helps keep
v temperature
of the liner down
helps remove some of the heat loading at the very top of that test it
distance typically only absorb about twenty percent of heat loading unless
it's uh... uh...
manufacture design
based on uh... molly therapist in which is a move would be in thermal piston
uh... or it may be for floating articulated piston which allows the
spirit may have to move which decreases somebody he loaded
we talk about the seller what we're looking at now is
how this cylinder deep is measured
for its dimension to find out can it go back into service
now probably in the camera late you can see that we have a good cross hatch
pattern on the cylinder
and that's supportive of
having good functioning clearances in the engine
uh... with the piston right
if we did not have those crack clearances then we would see a lot of
scoring scarring and we may even see some heat loading quintet ticket
dimension of this cylinder
and we're gonna set it to the dimension that i already have established here
then we're going to read beyond that measurement and hopefully not be on
manufactures specification
which we already established that
five inches one hundred and twenty-two
so their way to go in india's
double-checked the dimension
using the couple different tools
and we have
five inches
one hundred and seventeen
thousand
okay now the manufacturer says that this is that this card cylinder
at five inches one hundred and twenty two
so we still have a little bit of a buffer zone