{"id":2536,"date":"2023-11-13T22:47:41","date_gmt":"2023-11-13T21:47:41","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2536"},"modified":"2023-11-13T22:47:41","modified_gmt":"2023-11-13T21:47:41","slug":"subsequent-installation-of-vapor-bubble-draw-off-for-accelerating-pump-1975-76-only","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/13\/subsequent-installation-of-vapor-bubble-draw-off-for-accelerating-pump-1975-76-only\/","title":{"rendered":"Subsequent installation of vapor bubble draw-off for accelerating pump (\u00ae 1975\/76 only)"},"content":{"rendered":"

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07.2\u2014156 Subsequent installation of vapor bubble draw-off for accelerating pump <\/strong>(\u00ae 1975\/76 only)<\/strong><\/div>\n<\/div>\n<\/td>\n
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A. General information and operation<\/div>\n<\/div>\n<\/td>\n
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Starting faults may come up at high outside tempera\u00adtures as a result of vapor lock in accelerating pump.<\/div>\n
As a remedy, a vapor bubble draw-off can be sub\u00adsequently installed.<\/div>\n<\/div>\n<\/td>\n
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Layout of vapor bubble draw-off<\/div>\n<\/div>\n<\/td>\n
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Operation<\/div>\n<\/div>\n<\/td>\n
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At operating temperature, the control window (231) of thermostatically controlled bypass choke (TN choke) is closed. By means of leak air on control piston (229) at idle, the vacuum in intake pipe is effective up to pump chamber and able to draw-off any vapor bubbles there.<\/div>\n<\/div>\n<\/td>\n
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1074-7172<\/strong><\/div>\n<\/div>\n<\/td>\n
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07.2.2 la\u2014156\/1<\/div>\n<\/div>\n<\/td>\n
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B. Subsequent installation<\/div>\n<\/div>\n<\/td>\n
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1\u00a0 \u00a0 Remove carburetor, remove carburetor cover and take out float (07.2-194).<\/div>\n
2\u00a0 \u00a0 Remove accelerating pump cover, diaphragm and diaphragm spring.<\/div>\n
3\u00a0 \u00a0Drill a connecting duct of 1.5 mm dia. from pump chamber to threaded hole of cover fastening means.<\/div>\n<\/div>\n<\/td>\n
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Attention!<\/strong><\/div>\n
Be sure to maintain proper direction when drilling, to avoid drilling into float chamber. In addition, the suction and delivery bore in pump chamber must be kept closed (e.g. with grease) as a protection against drill chips.<\/div>\n<\/div>\n<\/td>\n
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107\/1-7173<\/strong><\/div>\n<\/div>\n<\/td>\n
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4 Clean connecting duct, pump chamber, suction and delivery bore (drill chips, grease). Install compo\u00adnents of accelerating pump. Instead of fastening screw used up to now for threaded bore drilled through connecting duct, screw in draw-off connec\u00adtion (277) calibrated to 0.15 mm dia. together with sealing ring (278).<\/div>\n<\/div>\n<\/td>\n
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5 Drill fastening bore for draw-off connection (275).<\/div>\n
For this purpose, refinish housing eye (1) in such a manner that approx. 0.5 mm material will remain on flange of carburetor cover. Mark bore, punch, drill to 2 mm dia. and then to 4 mm dia.<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-156\/2<\/div>\n<\/div>\n<\/td>\n
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6 Screw draw-off connection (275) with sealing ring (278) and hex. nut (274) into carburetor cover.<\/div>\n
Note: <\/strong>The flange of the draw-off connection should be seated flat. If required, refinish contact surface. If hex. nut on carburetor cover touches carburetor cover, file off slightly.<\/div>\n<\/div>\n<\/td>\n
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7\u00a0 \u00a0Shorten fuel hose (276) to 100 mm and plug on.<\/div>\n
8\u00a0 \u00a0 Insert float bracket and holddown, mount carbu\u00adretor cover.<\/div>\n
9\u00a0 \u00a0 Install carburetor (07.2-194).<\/div>\n<\/div>\n<\/td>\n
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C. Checking vapor bubble draw-off for function<\/div>\n<\/div>\n<\/td>\n
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Test line<\/div>\n
1\u00a0 \u00a0 Vacuum hose, 30 mm long<\/div>\n
2\u00a0 \u00a0Transparent vacuum line, 65 mm long<\/div>\n<\/div>\n<\/td>\n
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1 <\/strong>Run engine at operating temperature <\/strong>for a short moment and stop. Remove fuel hose and actuate throttle valve lever smoothly several times. A fuel jet should now come out of draw-off connection (277). If not, the throttle bore in draw-off connection is clogged. Clean throttle bore, if required.<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-156\/3<\/div>\n<\/div>\n<\/td>\n
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2 Plug-on self-made test line, run engine at idle. Fuel or vapor bubbles should be drawn off, visible in trans\u00adparent test line.<\/div>\n<\/div>\n<\/td>\n
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3 If neither fuel nor vapor bubbles are drawn off, check draw-off connection (275) for passage and clean, if required.<\/div>\n<\/div>\n<\/td>\n
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4\u00a0 \u00a0 If there is still no draw-off, there is no or not enough vacuum available. In this case, unscrew leak air adjusting screw (232) by one turn. Repeat test.<\/div>\n
5\u00a0 \u00a0Pull off test line and plug-on fuel hose (276).<\/div>\n
6\u00a0 \u00a0Set to idle (07.2-100).<\/div>\n
Attention!<\/strong><\/div>\n
When adjusting or checking idle speed emission value, the fuel hose (276) for drawing off at accelerating pump must be pulled off.<\/div>\n
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1074-7172<\/strong><\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-156\/4<\/div>\n<\/div>\n<\/td>\n
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Flat rate<\/strong><\/div>\n
Basic job: 19 work units or 1.6 hours Related job: 16 work units or 1.3 hours<\/div>\n
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Conversion set for vapor bubble draw-off of accelerating pump<\/div>\n<\/div>\n<\/td>\n
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110 586 00 07<\/div>\n<\/div>\n<\/td>\n
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Conversion set<\/div>\n
274\u00a0 \u00a0 Hex nut.<\/div>\n
275\u00a0 \u00a0Draw-off connection<\/div>\n
276\u00a0 \u00a0Fuel hose<\/div>\n
277\u00a0 \u00a0Draw-off connection with 0.15 mm throttle bore (orifice)<\/div>\n
278\u00a0 \u00a0Sealing ring<\/div>\n<\/div>\n<\/td>\n
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07.2.2 la-156\/5<\/div>\n<\/div>\n<\/td>\n
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    07.2\u2014156 Subsequent installation of vapor bubble draw-off for accelerating pump (\u00ae 1975\/76 only)   A. General information and operation   Starting faults may come up at high outside tempera\u00adtures as a result of vapor lock in accelerating pump. As a remedy, a vapor bubble draw-off can be sub\u00adsequently installed.   Layout of vapor bubble draw-off   Operation   At operating temperature, the control window (231) of thermostatically controlled bypass choke (TN choke) is closed. By means of leak air on control piston (229) at idle, the vacuum in intake pipe is effective up to pump chamber and able to draw-off any vapor bubbles there.     1074-7172   07.2.2 la\u2014156\/1       B. Subsequent installation 1\u00a0 \u00a0 Remove carburetor, remove carburetor cover and take out float (07.2-194). 2\u00a0 \u00a0 Remove accelerating pump cover, diaphragm and diaphragm spring. 3\u00a0 \u00a0Drill a connecting duct of 1.5 mm dia. from pump chamber to threaded hole of cover fastening means.   Attention! Be sure to maintain proper direction when drilling, to avoid drilling into float chamber. In addition, the suction and delivery bore in pump chamber must be kept closed (e.g. with grease) as a protection against drill chips.   107\/1-7173   4 Clean connecting duct, pump chamber, suction and delivery bore (drill chips, grease). Install compo\u00adnents of accelerating pump. Instead of fastening screw used up to now for threaded bore drilled through connecting duct, screw in draw-off connec\u00adtion (277) calibrated to 0.15 mm dia. together with sealing ring (278).   5 Drill fastening bore for draw-off connection (275). For this purpose, refinish housing eye (1) in such a manner that approx. 0.5 mm material will remain on flange of carburetor cover. Mark bore, punch, drill to 2 mm dia. and then to 4 mm dia.   07.2.2 la-156\/2       6 Screw draw-off connection (275) with sealing ring (278) and hex. nut (274) into carburetor cover. Note: The flange of the draw-off connection should be seated flat. If required, refinish contact surface. If hex. nut on carburetor cover touches carburetor cover, file off slightly. 1O7-1288S   7\u00a0 \u00a0Shorten fuel hose (276) to 100 mm and plug on. 8\u00a0 \u00a0 Insert float bracket and holddown, mount carbu\u00adretor cover. 9\u00a0 \u00a0 Install carburetor (07.2-194). ’?ln\u20141> U   C. Checking vapor bubble draw-off for function Test line 1\u00a0 \u00a0 Vacuum hose, 30 mm long 2\u00a0 \u00a0Transparent vacuum line, 65 mm long   1 Run engine at operating temperature for a short moment and stop. Remove fuel hose and actuate throttle valve lever smoothly several times. A fuel jet should now come out of draw-off connection (277). If not, the throttle bore in draw-off connection is clogged. Clean throttle bore, if required.   07.2.2 la-156\/3       2 Plug-on self-made test line, run engine at idle. Fuel or vapor bubbles should be drawn off, visible in trans\u00adparent test line. Test line   3 If neither fuel nor vapor bubbles are drawn off, check draw-off connection (275) for passage and clean, if required.   4\u00a0 \u00a0 If there is still no draw-off, there is no or not enough vacuum available. In this case, unscrew leak air adjusting screw (232) by one turn. Repeat test. 5\u00a0 \u00a0Pull off test line and plug-on fuel hose (276). 6\u00a0 \u00a0Set to idle (07.2-100). Attention! When adjusting or checking idle speed emission value, the fuel hose (276) for drawing off at accelerating pump must be pulled off. 275   1074-7172   07.2.2 la-156\/4       Flat rate Basic job: 19 work units or 1.6 hours Related job: 16 work units or 1.3 hours Spare parts   Designation Part no.   Conversion set for vapor bubble draw-off of accelerating pump 110 586 00 07   Conversion set 274\u00a0 \u00a0 Hex nut. 275\u00a0 \u00a0Draw-off connection 276\u00a0 \u00a0Fuel hose 277\u00a0 \u00a0Draw-off connection with 0.15 mm throttle bore (orifice) 278\u00a0 \u00a0Sealing ring   07.2.2 la-156\/5        <\/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-2536","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\/2536","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=2536"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2536\/revisions"}],"predecessor-version":[{"id":2537,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2536\/revisions\/2537"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}