Engine Maintenance
92
Figure 121: Engine Oil Pressure Switch
Engine Oil Pressure Switch
Engine oil pressure switch should rise
immediately on starting. If engine oil pressure
drops below 10 ± 2 psig (69 ± 14 kPa), the switch
closes and signals the microprocessor to stop the
engine. See SPECTRUM
™
TS Microprocessor
Controller Diagnostic Manual.
Engine Oil Change
The engine oil should be changed according to the
“Maintenance Inspection Schedule”. Drain the oil
only when the engine is hot to ensure that all the
oil drains out. When changing oil, try to make
sure that the truck is not tipped away from the
direction that the oil is supposed to flow from the
oil pan. It is important to get as much of the
residual oil out as possible because most of the
dirt particles are in the last few quarts of oil to
drain out. Refill the pan with oil (see the
“Specifications” chapter) and check the dipstick
level. Run the unit, and then recheck the oil level.
NOTE: Fill the crankcase slowly so oil will not
run into the breather hose, thus filling up an
open cylinder. Leaving the dipstick out while
adding engine oil will vent the crankcase.
Add oil as necessary to reach the full mark. See
the “Specifications” chapter of this manual for
correct type of oil.
Oil Filter Change
The oil filters should be changed along with the
engine oil.
Spin-on Filters:
1. Remove the filter.
2. Apply oil to rubber ring of new filter and
install filter.
3. Tighten the filter until the rubber ring makes
contact, then tighten 1/2 turn more.
Crankcase Breather
The crankcase breather system ducts crankcase
gases formed in the crankcase directly to the
intake manifold. Harmful vapors that would
otherwise collect in the crankcase and
contaminate the oil or escape to the outside, are
now drawn back into the engine and burned. The
breather hose between the valve cover and the
intake manifold on the TK 3.95 engine should be
inspected yearly to make sure it is not plugged.
The TK376 engine does not use a breather hose
because the valve cover and the intake manifold
are combined in an assembly.
AJA1521
1. Spin-on Oil Filter
2. Pressure Valve Nut
3. Oil Pressure Valve
Figure 122: Oil Filter Parts
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