jeep ULTJIVERSAL SERIES SjE l2 l l ZE MANUAL c E i i nianifdlcl and install special adapter Connect the lv I V VW V i V tr vlvv I 1 if vacuum gauge tube to the special adapter as shown U lt Q f in Fig C 23 fcr the Hurricane F4 engine i i v l jj i A l p l Start the engine Connect a Tachometer Tool ii ii i Z i V l i Z ttt C 3 2El96 from the distributor primary terminal to A l i i l i VV WV VV V V 5 A ground and set the engine speed at the specified J t i A 4 4 rpnr given rn Par C 30 Observe the vacuum read M x t ing and interpret as follows r z i l VV H V t f VV Ea a A steady reading from 18 to 20 457 a 508 VV rvvv i D mm of mercury is a normal reading indicating V i iil V rt rr ii i that valve and spark timing valve seating and v tEEEE EEE ire iri tbc r iii A t t tl fj r s t r z ll piataa rms ssalma are all satlsfastpry r i aaa b A steady but below normal reading indicates i 4 V i i s g j t Z A aiiiii a condlition common to all cylinders such as a J zzv ppnnn ria I rr 3 a r A lea at the carburetor gasket late ignition or valve E rrrrzg rt t t r r i tltaiaa ar umfarm putau dart aad bare Wear V V cclE EE l lr A Slavlv fluctuadaa at ddfdaa readme la ifi dicates that the carburetor idle mixture is incorrect V r iV i l i u if npvi ll Y V 4 Look for the cause in the fuel system A E V VVVV r y 4 d A rhythmic pulsating reading is caused by a 2 r condition affecting one or more cylinders but not iZ iw gf it 13034 all and indicates leaky valve gasket blowby re stricted intake port or an electrical miss Fit 22 QHECKING FUEL PUIWP PRESSURE DAUN LESS V 5 EN INE 8 AH lf1t8I 1 1 1lt t Ht pulsating feadlng ls caused by an occasional malfunction such as a sticking valve e couple et srreires to be sure me pump is primed all valves may be arratlc m aparatipa if the valva Using a half pint bottle or similar measure pump Sl mlg 43Y weak l tYl 8l ml caused uy msuffr 1 2 pim 24 jg Of ue by cmmjdrlg the engine cient distributor point tension or low coil voltage with the starter motor Count the strokes neces Cauplsdvvrth i s st t spark plug gaps pr fpulad sary to mi the measure ir mere than 20 strokes plues pr dirt in the fuel system fmdlag its vvay lata are I quix d fuel pump is i ffi jjgnt the tank p3SlSlE1g S of critical size OI VHIVE S f3tS in th f CHI line is leaking air or the fuel supply is restricted buY t0i Check fuel filter in the fuel tank if line ls restricted f A normal reading that quickly falls off with engine running at 2000 rpm indicates exhaust c 24 Checlk Man d vacuum back pressure caused by a restric1 ion in the exhaust To check the intake manifold vacuum on the Hurri svSt m cane F4 engine remove the ventilation valve and 9 lM3k ludlcated 0l Y u0uS ta blilug Vacuum ta L iirrmg from me manifold and install special 18 tp 12 l 457 a 50 8 mm al maraury aarmal adapter On 1 he Dauntless V 6 engine remove the Yeudlugh pipe plug located in the right rear of the intake 02 5 cmburetor Adiusmwms p r r e Refer to Fig C 124 C 25 and C 26 if A 3 M Carburetor adjustments should not be attempt ed ld n A V s j it fj e until it is known that engine ignition and com Q gQ g i j r j C iil Y iiii pression are in good order Any attempt to adjust i r Q v i V VVV V VV 1 l M Or alter the carburetor to compensate for faulty ri f i ii l aaaa E il iiiiiiiii iil A z ccmdititms elsewhere will result in reduced econ V jgi z iii overall perf 2nance C iiil i Cautlcn If an engine is idling too slow or rough V i i l T this may be caused by a cloggedl ventgator valiie g i i iTia Q i a i i l r i j r j ar t sa tharafarar paver adjust ti a Car uratat i a Y W without first checking the crankcase ventilator i f A i L l iS Qisgsr Cu l V 3lV aad hO 5 t rv i3 r r r j f i il u e v L Qgi iV ii i i i l H YZ The air cleaner must be left in place while making r V i idle zspeed and mixture adjustments All lights and j gjjj y iiii i lil aa A acce sor ies must be turned off The positive crank fi r pvyz i case ventilator system should also be in good oper r l i ating condition when making carburetor adjust iii r rr j ff ments Either of these items noticeably affects the e l e ri air fuel fatip at idle t r rE i l L li rrr i i r r Hurrlaaaa F4 Eaama F G C 23 CHECKING MANIFOLD VACUUM Note The idle mixture adjustment procedure for HURRICANE F4 ENGINE the late model YF 49415 and YF 6115S Carter 31