74 / 745
KRYOTEC ENGINE
66
gases in the crankcase. This degrades the oil,
promoting additional formation of deposit material.
If left uncorrected, the result is plugged oil rings,
oil consumption, rapid ring wear due to sludge
buildup, ruptured gaskets and seals due to
crankcase pressurization.
4.
Worn Piston Ring Grooves
For piston rings to form a good seal, the sides of
the ring grooves must be true and flat - not flared
or shouldered. Piston rings in tapered or irregular
grooves will not seal properly and, consequently,
oil will pass around behind the rings into the
combustion chamber.
5.
Worn, Broken or Stuck Piston Rings
When piston rings are broken, worn or stuck to
such an extent that the correct tension and
clearances are not maintained, this will allow oil to
be drawn into the combustion chamber on the
intake stroke and hot gases of combustion to be
blown down the cylinder past the piston on the
power stroke. All of these conditions will result in
burning and carbon buildup of the oil on the
cylinders, pistons and rings.
6.
Cracked or Broken Ring Lands
Cracked or broken ring lands prevent the rings
from seating completely on their sides and cause
oil pumping. This condition will lead to serious
damage to the cylinders as well as complete
destruction of the pistons and rings.
Cracked or broken ring lands cannot be corrected
by any means other than piston replacement.
7.
Worn Valve Stems and Guides
When wear has taken place on valve stems and
valve guides, the vacuum in the intake manifold
will draw oil and oil vapor between the intake
valve stems and guides into the intake manifold
and then into the cylinder where it will be burned.
8.
Bent or Misaligned Connecting Rods
Bent or misaligned connecting rods will not allow
the pistons to ride straight in the cylinders. This
will prevent the pistons and rings from forming a
proper seal with the cylinder walls and promote oil
consumption.
In addition, it is possible that a bearing in a bent
connect rod will not have uniform clearance on the
connecting rod wrist pin.
Under these conditions, the bearing will wear
rapidly and throw off an excessive amount of oil
into the cylinder.
9.
Fuel Dilution
If raw fuel is allowed to enter the lubrication
system, the oil will become thinner and more
volatile and will result in higher oil consumption.
The following conditions will lead to higher oil
consumption;
• Excess fuel can enter and mix with the oil via a
leaking fuel injector
• Restricted air intake
• Excessive idling
10.
Contaminated Cooling Systems
Corrosion, rust, scale, sediment or other
formations in the water jacket and radiator will
prevent a cooling system from extracting heat
efficiently. This is likely to cause cylinder distortion
thus leading to higher oil consumption.
11.
Oil Viscosity
The use of oil with a viscosity that is too light may
result in high oil consumption. Refer to the vehicle
owner's manual for the proper oil viscosity to be
used under specific driving conditions and/or
ambient temperatures.
12.
Dirty Engine Oil
Failure to change the oil and filter at proper
intervals may cause the oil to be so dirty that it will
promote accumulation of sludge and varnish and
restrict oil passages in the piston rings and
pistons. This will increase oil consumption; dirty oil
by nature is also consumed at a higher rate than
clean oil.
13.
Crankcase Overfull
Due to an error in inserting the oil dip stick so that
it does not come to a seat on its shoulder, a low
reading may be obtained. Additional oil may be
added to make the reading appear normal with
the stick in this incorrect position which will
actually make the oil level too high.
If the oil level is so high that the lower ends of the
connecting rods touch the oil in the oil pan
excessive quantities of oil will be thrown on the
cylinder walls and some of it will work its way up
into the combustion chamber.
14.
Excessively High Oil Pressure
A faulty oil pressure relief valve may cause the oil
pressure to be too high. The result will be that the
engine will be flooded with an abnormally large
amount of oil in a manner similar to that which
occurs with worn bearings. This condition may
also cause the oil filter to burst.
15.
Aftermarket Performance Chips and
Modification
Increasing performance through the use of
performance/power enhancement products to a
stock or factory engine will increase the chance of
excessive oil consumption.