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This is the chain that drives the camshaft,
valve train and ignition system. It's a very important part in your
engine dependability and performance. A little history on the Toyota
4 cylinder engine. In 1975-82 the 20R
through 22R engine used a double chain drive system. This was very
dependable. In 1983-84 early 22R Toyota used a single chain with
plastic guides. This chain is prone to stretching beyond the
tensioner's limits, resulting in a slack chain. This engine family
can be upgraded to the 1975-85 double chain kit.
Providing a very dependable chain upgrade for a reasonable price.
In 1985-95 22R/RE, Toyota introduced a new designed engine family,
changing the distance between the cam to crank centerline ie: shorter head
and shorter block. This required a shorter single chain with plastic
guide rails. "When introduced, LC Engineering experienced problems
with this in their high performance R&D department. The chain will
stretch beyond the tensioner's limits allowing the chain to slip against
the plastic guides resulting in breaking the guides (that's the noise
heard on cold start up). Prolonged engine operation will result in
the chain wearing through the timing cover allowing coolant to leak into
the engine crankcase.
This failure is often diagnosed as a cracked head or a blown head
gasket. LC Engineering has three way to prevent or improve this
problem.
#1 Toyota recommends changing the Chain
Kit every 70-80k miles on a stock engine light duty application.
This will work fine by using .
#2 Change the Chain Kit every 70-80k and
upgrade to a Single Chain Late Steel Guide Kit.
Warning: This will not prevent the chain from
stretching. Prolonged engine usage will result in the chain breaking
and that is much worse than a water leak. Suggested for use
in light duty operation only.
#3 The LC Engineering Exclusive!
Timing Chain Conversion Kit was designed in 1995 when we experienced
these issues. This kit provides the customer with
all the necessary components required to install a
double chain with steel guides on your 1985-95 22R/RE
engine. This Timing Chain Conversion Kit will
outlast the vehicle and handle all the high performance
demands that you require. Problem solved! |
