VI EM SSION CONT l0LS EXHAUST SYSTEMS 4A 39 ii S it E i z M sa we v S i A eg w S j S S i o 1 I g gN I counreawzrcnv counranwsicm 3 gN V S 1 S 4 lr Ammss moss Flu 4A I6 Ilsal laIv in Bland PusilI n SIx Cyllndcr FIg 4A 41 II aIVaIv In Dinan P0sitinn SIx Gyllndnr 6 Position heat valve as shown in figure 4A 46 The manifold heat valve must operate freely and and install shaft and counterweightassembly should be checked and lubricated every 5 000 miles on 7 Rotate counterweight until spring stop contacts Cherokee Wagoneer and Truck models and every bptmmgfmanifqld buggy 30 000 miles on CJ models with Jeep Heat Valve S Align hose in valve with screw threads in shaft L b U equlvalent and install but do not tighten retaining screw 9 Close heat valve and install tension spring with hook end up and pointing away from manifold Hook Raplaunmnnl spring under support pin 10 Operate heat valve several times to allow shaft 1 Disconnect and lower exhaust mpel to center 2 Replace with manifold heat valve and gaskets 11 Hold shaft and move valve as far as possible 3 Replace exhaust pipe guskew from counterweight Tighten retaining screw h d t t h t 12 Check Operation Ofvalvel mmg igogosition ex aust pipes an cormec 0 ex aus 13 Install intake and exhaust manifolds refer to Section 1A Six Cylinder Engine y 8 Enum tension svmno r x A thermostatically controlled heat valve mounted V1 4 between the right exhaust manifold and exhaust pipe directs exhaust heat to the intake manifold for rapid kim I I fuel vaporization during engine warmup The valve is rl jp Q closed directing exhaust heat through the intake I ir fr manifold crossover passage when the counterweight is v i if in the horizontal position fig 4A 48 The exhaust heat crosses through the intake manifold and diS h6l QN 5i ges into the left exhaust manifold until the engine any reaches operating temperature At this time the ther wilicr VM mostatic spring loses its tension and the counter r 2 i a g f i li UNTERwEIGHT weight moves downward opening the valve and allow AV r i M S ing the exhaust heat to discharge through the right ex haust pipes Fig AMB Exhaust Manllmld Ilut V Iv V 8