Oil System One-Way Check Valve - Polaris 1999 Sportsman 400 Service Manual

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c. Install the outer rotor (8 , Figure 140) into the
pump body and inner rotor.
d . Slo wly rotate thc pump shaft to ens ure both
roto rs are moving free ly.
4. If removed , install the locat ing dowe l into the
pump body.
5. Install the middle cover (A, Figure 141) onto the
pum p body and locating dowel.
6. Asse mble the feed side into the middle cover as
follows:
a. Install the outer dowe l pin into the pump shaft
and center it.
b. Insta ll the inner roto r (8, F igure 141) and
properly index it with the dowel pin.
c. Insta ll the outer roto r (F igure 142 ) into the
midd le cove r and inner rotor.
d. Slow ly rotate the pump shaft to ensure both
rotors are movi ng freely.
7. Install the feed chamber cove r (Figure 126) onto
the middle cover and dowel pin.
8. Install the cover screw and tighten to the torque
specification listed in Table 1.
9. Install the pump intake scree n (Figu re 143) aud
screws. Tighten the screws securely.
NOTE
Do not use any gasket sealant when
installing the pump onto the crank-
case.
10. Prime the oil pump with clea n engi ne oil (F ig-
ure 144). Add oil until it runs out the other opening.
11. App ly a light coa t of clea n engine oil to the
mating surfac e of the oil pump and the right side
crankcase. Install the oil pump (8, Figure 124) and
bo lts (A, Fig ure 124) and tighten the bo lts to the
torqu e speci fication listed in Ta ble 1.
12. Assemble the crankcase halves as described in
this chapter.
OI L SYSTEM ONE-WAY CHECK VALVE
The one -\...ay chec k valve (F igure 145) is located
under the flanged plug on the
ten
side of the engine
crankcase near the externa l o il pipes.
Th e chec k valve prevents oil in the tank fr om
drai ning into the engi ne sump when the engine is
not runn ing. The valve consists of a chec k valve,
spri ng and sea ling washer and is not serviceable.
CHAPTER FIVE
o