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Overdrive
| September 2014
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Untitled-4 1 7/25/13 10:43 AM
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INFO
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Bruce
Mallinson is
the owner of
Pittsburgh
Power, an
engine
performance
shop in
Saxonburg, Pa.
Many owner-operators seem to
follow that rule, but you shouldn't get
caught up in that mindset: It's much
more economical to maintain an
engine and truck than it is to replace
parts because of neglect.
Specifically, don't let it apply to get-
ting your overhead set.
Valves and injectors – or the old
"run the rack" term – need to be done
every 150,000 miles. A good mechanic
also will look for other problems when
he is setting the valves and injectors.
Make it a point every 150,000 miles
to have this work done or, as
I've preached many times,
pay the price later when a
major overhaul is required,
costing you a trip to the shop,
parts, labor and down-
time that could have been
avoided.
On a newly rebuilt engine,
the overhead should be reset
at 25,000 miles.
Don't forget the oil
That brings me to my next
point: In freshly rebuilt
engines, the oil should be
changed between 1,000 and
2,000 miles.
Piston rings don't seat into
the cylinder walls; the cross-
hatch seats into the piston
rings. The metal that is
scraped by the cylinder walls
and all of the other break-in
materials end up in the oil.
So drain the oil before
2,000 miles, then do the next
drain at 10,000 miles and the
third at 15,000.
By the time that rebuilt
engine turns its first 26,000
miles, the oil should have
been changed three times.
At that point, the engine
is clean on the inside, and if
you are going to run ex-
tended oil drains, start from
there.
It may not be broke when
the work is done, but antici-
pating problems down the
road is the best way to keep
them from happening.
