TRUCK SERVICE MANUAL
1. Determine oil pan part number; check high and low
Full-Flow Paper Element Filter
2. Drain all oil from oil pan, make sure all oil has drained
1. Remove filter case and element from filter head,
3. Fill oil pan with amount of oil indicated as low level in
remove seal ring and discard.
Table 7-1; allow sufficient time for oil to drain down into
2. Lift element from case; inspect element pleats if metal
4. Insert dipstick into dipstick tube until dipstick contacts
is found in elements, an inspection of connecting rod and
bottom of pan. Measure distance dipstick protrudes
main bearings should be made at once; discard element.
above tube, remove dipstick and cut off end the same
amount as measured protrusion (to bottom of cap).
The filter by-pass valve normally requires no
5. Insert dipstick all the way into tube. Remove dipstick
servicing; however, check to make sure the valve works
and mark low oil level indicated. Mark should be 0.010
freely. The valve is spring loaded and opens on a spring
inch [0.3 mm] deep. Stamp (electric etch on spring steel)
letter "L" immediately above mark (Fig. 7-1). Do not use
a chisel for marking, or stamp too deep. This may cause
1. Remove all pipe plugs and fittings from filter head.
dipstick to break. Cut excess length off dipstick leaving
Remove filter by-pass valve retainer (1, Fig. 7-2) with a
minimum of 1/2 inch [12.70 mm] below low level mark.
standard puller, valve seat (2) and spring (3) from filter
head (1), if necessary after Step 3 above. Housing may
remain in filter head. Clean housing and case in
approved cleaning solvent and dry with compressed air.
Fig. 7-1. (V40726) Dipstick markings
6. Add amount of oil to pan to bring to high level as
indicated in Table 7-1. Allow time for all oil to drain into
pan. Insert dipstick and withdraw; now mark oil level
indicated. Stamp letter "H" immediately above mark.
7. Mark opposite side of dipstick (if desired) for running
levels (Fig. 7-1). Running levels provide equivalent
readings to static levels with engine running at low idle
Fig. 7-2 (N10730) By-pass valve full-flow filter
(550 25 RPM). Add running level marks with oil supply,
2. Remove snap ring from capscrew securing support,
low and high, as stated previously.
seal washer and spring on capscrew in case. Slide bolt
Note: Running level readings require oil gauge tube with
from case; remove and discard copper washer and seal.
increased internal length and an internal drilled hole to
3. Inspect all parts for wear or distortion; discard and
provide for tube venting (if not originally equipped with
running level markings).