Chevrolet BEAUVILLE SPORTVAN G10 SERIES, Руководство по обслуживанию

Страница: 209 / 350

EMISSION C O N TR O L SYSTEM 6T-17
• Install and adjust drive belt as o u tlin ed above.
• H old pum p pulley from turning by com pressing drive
belt then torq u e pum p pulley bolts to 25 ft. lbs. (Fig.
6T-27).
• R echeck drive belt tension and adjust if required.
PUMP FILTE R
Replacement
• Rem ove drive belt and pum p pulley as previously
outlined.
• Pry loose o u te r disc o f filter fan.
• Pull rem aining p o rtio n o f filter o ff w ith pliers (Fig.
6T-28).
N O T E : Care should be taken to prevent fragments
fro m entering the air intake hole.
• Install the new filter by draw ing it on w ith th e pulley
and pulley bolts (Fig. 6T-29). D o n o t a tte m p t to install a
filter b y ham m ering it on o r pressing it on.
• Draw the filter dow n evenly by altern ately torquing the
bolts. Make certain th a t th e o u te r edge o f the filter slips
in to th e housing. The slight am o u n t o f interference w ith
the housing bore is norm al.
• If leak is suspected on the pressure side o f th e system or
any tubes an d /o r hoses have been disconnected on the
pressure side, the connections should be checked for
leaks w ith a soapy w ater solution.
• With the pum p running, bubbles will fo rm if a leak exists
(Fig. 6T-30).
Replacement
• To replace any hose an d /o r tu b e , note ro u tin g then
rem ove hose(s) an d /o r tube(s) as required.
C A U T IO N : The 1 /4 " pipe threads at the cylinder
head on L-6 or th e exhaust manifolds on V 8 are a
straight pipe thread. Do n ot use a 1 /4 " tapered pipe
tap. The hoses o f the A .I.R . System are a special
material to withstand high tem perature. No other
type hose should be substituted.
• Install new hose(s) a n d /o r tube(s), ro u tin g them as when
removed.
• T ighten all connections.
N O T E : Use anti-seize compound on threads o f the
air m anifold to exhaust m anifold or cylinder
connections.
N O T E : A new filte r may squeal upon initial opera­
tion until its O .D . sealing lip has w orn in.
A IR M A N IF O L D , HOSE A N D TUBE
Inspection
• In sp ect all hoses for d eterio ratio n or holes.
• Inspect all tubes fo r cracks or holes.
• Check all hose and tu b e connections.
• Check all tu b e and hose routing. In terference m ay cause
wear.
CHECK V A L V E
Inspection
• The check valve should be inspected whenever th e hose is
disconnected from th e check valve o r w henever check
valve failure is suspected. (A pum p th a t h ad becom e
inoperative and h a d show n indications o f having exhaust
gases in the pum p w ould indicate check valve failure.)
• Orally blow through the check valve (to w ard air m ani­
fold) th e n a tte m p t to suck back through check valve.
Flow should only be in one d irection (to w ard the air
m anifold) (Fig. 6T-31).
AIR S H O U LD F L O W
IN THIS D IR E C T IO N
IO N L Y
Fig. 6 T -3 0 -C h e c k in g fo r Leaks w ith a Soapy W ater Solution
Fig. 6 T -3 1 —A ir F lo w Through Check Valve
C H E V Y V A N S H O P M A N U A L