{"id":2511,"date":"2023-11-13T07:31:06","date_gmt":"2023-11-13T06:31:06","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2511"},"modified":"2023-11-13T07:31:06","modified_gmt":"2023-11-13T06:31:06","slug":"testing-starting-device-choke-for-function-cold-start","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/13\/testing-starting-device-choke-for-function-cold-start\/","title":{"rendered":"Testing starting device (choke) for function (cold start)"},"content":{"rendered":"

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07.2\u2014128 Testing starting device (choke) for function (cold start)<\/strong><\/div>\n<\/div>\n<\/td>\n
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Testing and adjusting values<\/strong><\/div>\n<\/div>\n<\/td>\n
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voltages measured at battery<\/strong><\/div>\n<\/div>\n<\/td>\n
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Rest potential<\/div>\n<\/div>\n<\/td>\n
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min. 12.2 volts<\/div>\n<\/div>\n<\/td>\n
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Starting voltage<\/div>\n<\/div>\n<\/td>\n
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min. 10 volts<\/div>\n<\/div>\n<\/td>\n
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Regulating voltage alternator<\/div>\n<\/div>\n<\/td>\n
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13.0-14.5 volts<\/div>\n<\/div>\n<\/td>\n
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Voltages measured at ignition coil<\/strong><\/div>\n<\/div>\n<\/td>\n
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Terminal 15<\/div>\n<\/div>\n<\/td>\n
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3.6-4.6<\/div>\n<\/div>\n<\/td>\n
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Breaker contact „closed”<\/div>\n<\/div>\n<\/td>\n
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Terminal 1<\/div>\n<\/div>\n<\/td>\n
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0.7-1.5<\/div>\n<\/div>\n<\/td>\n
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Terminal 15<\/div>\n<\/div>\n<\/td>\n
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battery voltage<\/div>\n<\/div>\n<\/td>\n
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Breaker contact „open’<\/div>\n<\/div>\n<\/td>\n
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Terminal 1<\/div>\n<\/div>\n<\/td>\n
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battery voltage<\/div>\n<\/div>\n<\/td>\n
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Voltage at pre-resistor<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pre-resistor output 0.4 ohm Cable: red\/black (Pre-resistor bridge-over)<\/div>\n<\/div>\n<\/td>\n
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min. 9.6 volts<\/div>\n<\/div>\n<\/td>\n
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Carburetor<\/strong><\/div>\n<\/div>\n<\/td>\n
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TN control window opening at + 20 \u00b0C<\/div>\n<\/div>\n<\/td>\n
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approx. 2.5 mm<\/div>\n<\/div>\n<\/td>\n
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CO value after starting cold engine<\/div>\n<\/div>\n<\/td>\n
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7-8 %’)<\/div>\n<\/div>\n<\/td>\n
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M If the CO value is essentially above upper tolerance, spark plugs have a tendency for sooting, engine starts misfiring. If it is considerably below lower tolerance, starting faults and bypass faults may occur.<\/div>\n
Special tools<\/strong><\/div>\n<\/div>\n<\/td>\n
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Digital tester<\/div>\n<\/div>\n<\/td>\n
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\"m110<\/div>\n<\/td>\n
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001 589 54 21 00<\/div>\n<\/div>\n<\/td>\n
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Connecting cable 3 m long<\/div>\n<\/div>\n<\/td>\n
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000 589 04 90 00<\/div>\n<\/div>\n<\/td>\n
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Intermediate plug (adaptor)<\/div>\n<\/div>\n<\/td>\n
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000 589 72 63 00<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la\u2014128\/1<\/div>\n<\/div>\n<\/td>\n
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Trigger<\/div>\n<\/div>\n<\/td>\n
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000 589 71 63 00<\/div>\n<\/div>\n<\/td>\n
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Conventional test instruments<\/strong><\/div>\n<\/div>\n<\/td>\n
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Voltmeter, revolution counter and CO measuring instrument<\/div>\n<\/div>\n<\/td>\n
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Testing<\/strong><\/div>\n<\/div>\n<\/td>\n
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\"m110<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Let engine cool down to below + 20 \u00b0C. Check whether choke valve (147) is completely closed and has lateral clearance. (Below <\/strong>+ 20 <\/strong>\u00b0C the choke valve should be completely closed).<\/strong><\/div>\n
2\u00a0 \u00a0 Remove air filter, pull cable from choke cover heater so that choke valve is not completely opening during the following voltage measurements.<\/div>\n
3\u00a0 \u00a0Check battery for external condition (visual checkup). Check battery poles for oxidation.<\/div>\n
4\u00a0 \u00a0Test voltages on battery.<\/div>\n<\/div>\n<\/td>\n
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a) Rest potential<\/strong><\/div>\n
Connect voltmeter to battery plus and minus pole, read voltage.<\/div>\n
Nominal value: <\/strong>min. 12.2 <\/strong>volts<\/div>\n<\/div>\n<\/td>\n
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b) Starting voltage<\/strong><\/div>\n
Pull high-voltage ignition cable 4 out of distributor cover and connect to ground. Operate starting motor while reading voltage.<\/div>\n
Nominal value: <\/strong>min. 10 volts<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Ignition starter switch<\/div>\n
2\u00a0 \u00a0Pre-resistor 0.4 ohm<\/div>\n
3\u00a0 \u00a0Pre-resistor 0.6 ohm<\/div>\n
4\u00a0 \u00a0Ignition coil<\/div>\n
5\u00a0 \u00a0Standard switchgear<\/div>\n
6\u00a0 \u00a0Ignition distributor<\/div>\n
7\u00a0 \u00a0Diagnosis plug<\/div>\n
a\u00a0 \u00a0To starter terminal 16<\/div>\n
b\u00a0 \u00a0To diagnosis socket<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-128\/2<\/div>\n<\/div>\n<\/td>\n
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5\u00a0 \u00a0Test voltages at ignition coil.<\/div>\n
a)\u00a0 With breaker contact closed <\/strong>at terminal 15 and terminal 1:<\/strong><\/div>\n
Nominal values <\/strong>Terminal 15, 3.6\u20144.6 volts Terminal 1, 0.7\u20141.5 volts<\/div>\n
b)\u00a0 With breaker contact opened <\/strong>at terminal 15 and terminal 1:<\/div>\n
Nominal values: <\/strong>Terminal 15 and terminal 1 should be energized by battery voltage.<\/div>\n
6\u00a0 \u00a0Measure voltage at pre-resistor 0.4 ohm while starting (pre-resistor bridge-over).<\/div>\n
Nominal value: <\/strong>min. 9.6 volts<\/div>\n
7\u00a0 \u00a0 Insert high-voltage ignition cable 4 again into distributor cover.<\/div>\n<\/div>\n<\/td>\n
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8 Check choke cover preload. Markings (arrow) should be opposite each other.<\/div>\n<\/div>\n<\/td>\n
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J\/\/\/J\/8\/1<\/strong><\/div>\n<\/div>\n<\/td>\n
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9 Remove TN choke after loosening fastening screws (arrow) together with coolant hoses.<\/div>\n<\/div>\n<\/td>\n
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W7-127B<\/strong><\/div>\n<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-128\/3<\/div>\n<\/div>\n<\/td>\n
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10\u00a0 \u00a0Measure control window opening „a” <\/em>exposed by control piston with slide gauge.<\/div>\n
Nominal values: <\/strong>At + 20 \u00b0C approx. 2.5 mm.<\/div>\n
At approx. 0 \u00b0C control window should be completely open.<\/div>\n
11\u00a0 \u00a0 Install TN choke and air filter.<\/div>\n
12\u00a0 \u00a0Check warming-up total mixture without air in\u00adjection and EGR, adjust. For this purpose, connect CO measuring instrument and make air injection in\u00adoperative as described below (for (\u00a9> 1973\/74 noth\u00ading need be made inoperative):<\/div>\n<\/div>\n<\/td>\n
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(JJ <\/em>1976<\/strong><\/div>\n
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T) 1976, model 114<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pull rubber cap (arrow) from blue\/purple <\/strong>vacuum line.<\/div>\n<\/div>\n<\/td>\n
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T) 1976, model 116<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pull rubber cap (arrow) from blue\/purple <\/strong>vacuum line.<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-128\/4<\/div>\n<\/div>\n<\/td>\n
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(usa) <\/strong>California 1974<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pull off red <\/strong>vacuum line at connecting point (arrow).<\/div>\n<\/div>\n<\/td>\n
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<\u00a9) 1975\/76<\/strong><\/div>\n
Pull off blue\/purple <\/strong>vacuum line at connecting point (arrow).<\/div>\n<\/div>\n<\/td>\n
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Start engine and rapidly depress accelerator upon firing.<\/div>\n
Engage driving position for automatic transmission, permit CO value to come to rest and read. (If devia\u00adtions from tolerance value are high, stop engine im\u00admediately, change choke valve gap accordingly and repeat CO test).<\/div>\n
Nominal value: 7-8 % CO<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pushing together = leaner<\/strong><\/div>\n<\/div>\n<\/td>\n
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Pushing apart = richer<\/strong><\/div>\n<\/div>\n<\/td>\n
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Screwing out = leaner Screwing in = richer<\/strong><\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-128\/5<\/div>\n<\/div>\n<\/td>\n
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Again plug-on vacuum hoses for air injection and EGR (air injection with EGR operative).<\/div>\n
13\u00a0 \u00a0Again plug-on cable for choke cover heater.<\/div>\n
14\u00a0 \u00a0Test regulating voltage of alternator.<\/div>\n
Note: <\/strong>Prior to testing regulating voltage, check acid density of battery. If acid density (state of charge) of battery is lower than 1.24 kg\/dm3<\/sup> in tropical countries, a defective transistor regulator (full regulation) is no longer recognized.<\/div>\n
Checkup<\/strong><\/div>\n
Engine speed: 3000\/min<\/div>\n
Battery load: Compulsory consumer only (ignition) Regulating voltage measured after approx. two minu\u00adtes: 13.0-14.5 volts.<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-128\/6<\/div>\n<\/div>\n<\/td>\n
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    07.2\u2014128 Testing starting device (choke) for function (cold start)   Testing and adjusting values   voltages measured at battery   Rest potential min. 12.2 volts Starting voltage min. 10 volts Regulating voltage alternator 13.0-14.5 volts Voltages measured at ignition coil     Terminal 15 3.6-4.6   Breaker contact „closed”   Terminal 1 0.7-1.5   Terminal 15 battery voltage   Breaker contact „open’   Terminal 1 battery voltage   Voltage at pre-resistor   Pre-resistor output 0.4 ohm Cable: red\/black (Pre-resistor bridge-over) min. 9.6 volts   Carburetor   TN control window opening at + 20 \u00b0C approx. 2.5 mm   CO value after starting cold engine 7-8 %’)   M If the CO value is essentially above upper tolerance, spark plugs have a tendency for sooting, engine starts misfiring. If it is considerably below lower tolerance, starting faults and bypass faults may occur. Special tools   Digital tester 001 589 54 21 00   Connecting cable 3 m long 000 589 04 90 00   Intermediate plug (adaptor) 000 589 72 63 00   07.2.2 la\u2014128\/1       Trigger 000 589 71 63 00   Conventional test instruments   Voltmeter, revolution counter and CO measuring instrument   Testing 1\u00a0 \u00a0 Let engine cool down to below + 20 \u00b0C. Check whether choke valve (147) is completely closed and has lateral clearance. (Below + 20 \u00b0C the choke valve should be completely closed). 2\u00a0 \u00a0 Remove air filter, pull cable from choke cover heater so that choke valve is not completely opening during the following voltage measurements. 3\u00a0 \u00a0Check battery for external condition (visual checkup). Check battery poles for oxidation. 4\u00a0 \u00a0Test voltages on battery.   a) Rest potential Connect voltmeter to battery plus and minus pole, read voltage. Nominal value: min. 12.2 volts   b) Starting voltage Pull high-voltage ignition cable 4 out of distributor cover and connect to ground. Operate starting motor while reading voltage. Nominal value: min. 10 volts   1\u00a0 \u00a0 Ignition starter switch 2\u00a0 \u00a0Pre-resistor 0.4 ohm 3\u00a0 \u00a0Pre-resistor 0.6 ohm 4\u00a0 \u00a0Ignition coil 5\u00a0 \u00a0Standard switchgear 6\u00a0 \u00a0Ignition distributor 7\u00a0 \u00a0Diagnosis plug a\u00a0 \u00a0To starter terminal 16 b\u00a0 \u00a0To diagnosis socket   07.2.2 la-128\/2       5\u00a0 \u00a0Test voltages at ignition coil. a)\u00a0 With breaker contact closed at terminal 15 and terminal 1: Nominal values Terminal 15, 3.6\u20144.6 volts Terminal 1, 0.7\u20141.5 volts b)\u00a0 With breaker contact opened at terminal 15 and terminal 1: Nominal values: Terminal 15 and terminal 1 should be energized by battery voltage. 6\u00a0 \u00a0Measure voltage at pre-resistor 0.4 ohm while starting (pre-resistor bridge-over). Nominal value: min. 9.6 volts 7\u00a0 \u00a0 Insert high-voltage ignition cable 4 again into distributor cover.   8 Check choke cover preload. Markings (arrow) should be opposite each other. J\/\/\/J\/8\/1   9 Remove TN choke after loosening fastening screws (arrow) together with coolant hoses. W7-127B   07.2.2 la-128\/3       10\u00a0 \u00a0Measure control window opening „a” exposed by control piston with slide gauge. Nominal values: At + 20 \u00b0C approx. 2.5 mm. At approx. 0 \u00b0C control window should be completely open. 11\u00a0 \u00a0 Install TN choke and air filter. 12\u00a0 \u00a0Check warming-up total mixture without air in\u00adjection and EGR, adjust. For this purpose, connect CO measuring instrument and make air injection in\u00adoperative as described below (for (\u00a9> 1973\/74 noth\u00ading need be made inoperative):   (JJ 1976 Pull off blue\/purple vacuum line at connecting point (arrow).   T) 1976, model 114 Pull rubber cap (arrow) from blue\/purple vacuum line.   T) 1976, model 116 Pull rubber cap (arrow) from blue\/purple vacuum line.   07.2.2 la-128\/4       (usa) California 1974 Pull off red vacuum line at connecting point (arrow). <\u00a9) 1975\/76 Pull off blue\/purple vacuum line at connecting point (arrow).   Start engine and rapidly depress accelerator upon firing. Engage driving position for automatic transmission, permit CO value to come to rest and read. (If devia\u00adtions from tolerance value are high, stop engine im\u00admediately, change choke valve gap accordingly and repeat CO test). Nominal value: 7-8 % CO Pushing together = leaner   Pushing apart = richer   Screwing out = leaner Screwing in = richer   07.2.2 la-128\/5       Again plug-on vacuum hoses for air injection and EGR (air injection with EGR operative). 13\u00a0 \u00a0Again plug-on cable for choke cover heater. 14\u00a0 \u00a0Test regulating voltage of alternator. Note: Prior to testing regulating voltage, check acid density of battery. If acid density (state of charge) of battery is lower than 1.24 kg\/dm3 in tropical countries, a defective transistor regulator (full regulation) is no longer recognized. Checkup Engine speed: 3000\/min Battery load: Compulsory consumer only (ignition) Regulating voltage measured after approx. two minu\u00adtes: 13.0-14.5 volts.   07.2.2 la-128\/6        <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[32,27],"tags":[],"class_list":["post-2511","post","type-post","status-publish","format-standard","hentry","category-carburetor-fuel-pump-throttle-linkage","category-m110"],"aioseo_notices":[],"featured_image_src":null,"author_info":{"display_name":"mackuz","author_link":"https:\/\/mbci.mackuz.ovh\/index.php\/author\/mackuz\/"},"_links":{"self":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2511","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/comments?post=2511"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2511\/revisions"}],"predecessor-version":[{"id":2512,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2511\/revisions\/2512"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}