SKF Timing Belt Kits - SKF.com

Failure analysis overview
90% of engine running faults are caused by basic
problems, many of which can be prevented by correct
mounting and maintenance.
This chapter will cover some of the most common
drive system failures and how to prevent them from
happening.
Engine
Today, the timing cycle of the engine is more crucial
than ever. Almost every new engine is the “interference”
type, with the valves and pistons in close proximity. A
broken or “tooth-jumped” timing belt can cause the
piston to crash into an open valve, resulting in bent
valves, broken pistons, and serious engine damage.
Even though the older “non-interference” engines with
timing belt problems may not sustain the same type of
damage as “interference” engines, the driver will still be
stranded with a dead engine beside the road.
Timing drive system
Engine oil seal
Common failures:
1. Heat builds up (poor lubrication).
2. Stress due to out of round shaft (worn crankshaft/
camshaft).
These conditions will eventually cause the seal to fail,
with leakage and/or ingress of particles into the oil as
a result.
- Don’t let this happen to your customers!
An example of engine
damage caused by timing
component failure or
tooth jump.
1. Heat builds up 2. Stress due to out of round shaft
Here you can see oil on
the tensioner. A leaking
oil pump or damaged
engine seals will cause
the tensioner to fail.
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