Dan Continues His Lesson On Subaru T-belt Replacements ... - MOTOR

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Transcript

Last time we covered details that demand extra attention fora successful timing belt job on Subaru’s popular 2.2-liter en-gine, the vast majority of which are used in the Legacy. This
month we’ll further illustrate some of those details with photos. Remember, our series of t-belt
replacement tips should complement information in the appropriate shop manual.
We explained last time that there’s a timing
mark on each cam sprocket and one on the
crank sprocket reluctor. The cam sprocket timing mark is shown in photo 1 below; the crank
reluctor mark is shown in photo 2. Don’t forget
that when the crank mark is straight up at 12
o’clock, both cam sprocket marks must also be
straight up.
Photo 1 shows the notch that’s molded into
the black plastic piece on the front of the engine. This is your reference point for “straight
up,” or 12 o’clock. There’s a notch above each
cam sprocket, but it’s much easier to see when
you daub it with white paint.
Photo 1 also shows one of the white stripes
found on the timing belt. Here, the stripe happens to be perfectly aligned with the notch on
the engine and the one on the front of the cam
sprocket. But that won’t always be the case.
Don’t worry about aligning each stripe with a
timing mark. As long as all three sprocket marks
are straight up at the same time, it doesn’t matter where these darn belt stripes end up.
The actual cam sprocket timing mark is the
notch or indentation on the front face of the
sprocket, as shown in photo 1. Photo 3 shows
this mark highlighted with white paint to make
your life easier. Watch out, because one of the
car’s radiator hoses may make it difficult to
“sight up” the cam sprocket and engine notches
dead-on.
Next, don’t let other things distract you from
the actual cam sprocket timing mark. For example, some cam sprockets have blotches of paint
Dan continues his lesson on Subaru t-belt replacements
by showing you which marks are important and which are
bogus on the Japanese maker’s 2.2-liter four-banger.
Dan
Marinucci
Foreign Service
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h ot o: E
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u er re ro 16 August 2001
continued on page 18
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a n M
a ri n u cc i on them, like those shown in photo 1.
Ignore them! Likewise, ignore the arrow (highlighted in white) on the cam
sprocket in photo 3 that’s pointing to
about 1 o’clock. The actual timing
mark in photo 3 is the notch, marked
in white, at 12 o’clock.
Last month, we explained that a reluctor, which triggers the crank angle
sensor, is attached to the crank sprocket. The crank timing mark on Subaru’s
2.2 is a notch on the front face of this
reluctor, which is painted white and
positioned at 12 o’clock in photo 2. Its
mating mark, also highlighted in white,
is directly above it on the front of the
engine.
When you’re installing this t-belt, ignore the arrow on the crank sprocket
that’s pointing to 3 o’clock in photo 2!
Like other engines you’ve worked
on, this one has a self-contained hydraulic t-belt tensioner that must be
compressed and pinned in place. You
can safely compress the 2.2’s tensioner
in a shop vise (photo 4), provided you
compress it very slowly. The several
extra minutes this may add to the job
are still much, much cheaper than replacing a destroyed tensioner.
When you’ve compressed the tensioner piston enough to align the holes
shown at the left in photo 4, temporarily pin the piston in place with a small
Allen wrench or the stem of a pop rivet. Then reinstall the tensioner, leaving
its bolts finger-tight. Next, gently pry
the tensioner toward the timing belt to
put some initial pressure on the belt,
then tighten the tensioner bolts to
specification and remove the Allen
wrench or pop rivet.
Stop in next time when we tackle tbelt tips for the 2.5-liter engine.
Foreign Service
18 August 2001
3 4

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