[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-647886-105":59,"doc-detail-647886-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","mercruiser-sterndrive-123","Mercruiser Sterndrive 123","","Service manual excerpt for MerCruiser sterndrive units and related transom assemblies, including model coverage and serial-number cross-reference tables. Provides original gear ratios and alternate ratios when serviced with specific gear sets, mapping those ratios to corresponding serial-number ranges. Includes safety alerts and notices for DANGER, WARNING, CAUTION, and important operational cautions, plus guidance for servicing Sea Ray sterndrives by referencing matching MerCruiser model procedures.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/mercruiser-sterndrive-123/647886/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/mercruiser-sterndrive-123/647886.png","ImageObject",300,407,{"name":92,"@type":93},"Bintang","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What safety guidance does the manual highlight for service work?","Question",{"text":112,"@type":113},"It emphasizes observing “Warnings” and “Cautions” with the hazard symbol, following safety-alert instructions carefully, and using common-sense operation to prevent accidents.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are sterndrive gear ratios linked to serial numbers in the manual?",{"text":117,"@type":113},"The manual lists original ratios and ratios when serviced with specified gear sets, and then provides serial-number ranges that correspond to each ratio set.",{"name":119,"@type":110,"acceptedAnswer":120},"What cross-reference is provided for Sea Ray (Oyster White) sterndrives?",{"text":121,"@type":113},"It instructs that repairs to Sea Ray (Oyster White) sterndrives should follow procedures for the corresponding MerCruiser models shown in the cross-reference chart.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},647886,1793030009,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962085564381,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","􀀉􀀃􀀈􀀋􀀄􀀂􀀃  \n􀀆􀀁􀀇􀀊􀀁􀀅 Number 6  \nSterndrive Units R·MR·Alpha One ·  \nAlpha One SS  \nPrinted in U.S.A. 􀁻 1997, Mercury Marine 90-12934--2 1097  \n90-12934- -2 1097  \n90-12934--2  \n0  \n90-12934--2  \nModels Covered in This Manual  \nTransom Assemblies  \n\n| Model | Serial Number |\n| --- | --- |\n| MC 120R/140B/185R/488R/898R/228R/260R | 6216687 – 6849289 |\n| MC 120MR/140MR/170MR/185MR/190MR/200MR/ 230MR/260MR/300 Tempest MR | 6849290 – 0A471374 |\n| MC Alpha One/Alpha One SS | 0A471375 and Above |\n\nSterndrive Units  \n\n| MC 120R-260R |  |  |\n| --- | --- | --- |\n| Original Ratio | Ratio If Serviced With 13:21 Gears | Serial Number |\n| 1.98:1 | 1.94:1 | 6237861-6854392 |\n| 1.84:1 | 1.81:1 | 6225577-6862701 |\n| 1.65:1 | 1.62:1 | 6268065-6810537 |\n| 1.50:1 | 1.47:1 | 6229158-6847029 |\n| 1.32:1 | 1.29:1 | 6231571-6663947 |\n\n\n| MC 120 MR-300 TEMPEST MR |  |  |\n| --- | --- | --- |\n| Original Ratio | Ratio If Serviced With 13:28 Gears | Serial Number |\n| 1.98:1 | 1.94:1 | 6854393-0A476746 |\n| 1.84:1 | 1.81:1 | 6862702-0A470164 |\n| 1.65:1 | 1.62:1 | 6810538-0A475786 |\n| 1.50:1 | 1.47:1 | 6847030-0A479506 |\n\n\n| MC ALPHA ONE / ALPHA ONE SS |  |  |  |\n| --- | --- | --- | --- |\n| Original Ratio | Ratio If Serviced With\u003Cbr>13:28 Gears | R. H. Serial Number | L. H. Serial Number |\n| 1.98:1 | 1.98:1 | 0A476747 and Above | 0C881740 and Above |\n| 1.84:1 | 1.84:1 | 0A470165 and Above | 0C884040 and Above |\n| 1.65:1 | 1.65:1 | 0A475787 and Above | 0C881790 and Above |\n| 1.50:1 | 1.50:1 | 0A479507 and Above | 0C852908 and Above |\n| 1.32:1 | 1.32:1 | 0A613927 and Above |  |\n| Alpha One SS 1.50:1/1.32:1 | 1.50/1.32:1 | 0A545004 and Above |  |\n\n90-12934--2 1097 i  \nSea Ray Sterndrive Units and Transom Assembly (Oyster White)  \n\n| Original Ratio | Ratio If Serviced With 13:21 Gears | Serial Number |\n| --- | --- | --- |\n| 1.98:1 |  | 0B803866-0C348031 |\n| 1.84:1 |  | 0B800854-0C343526 |\n| 1.50:1 |  | 0B796473-0C340666 |\n| 1.32:1 |  | 0B804807-0C340030 |\n| Transom Assembly |  | 0B815811-0C340333 |\n\nWhen making repairs to Sea Ray (Oyster White) sterndrives, follow procedures as outlined for corresponding MerCruiser models as shown in the cross-reference chart below.  \n\n| Sea Ray | MerCruiser |\n| --- | --- |\n| 3.0L | 3.0L Alpha One |\n| 4.3L2 | 4.3L Alpha One |\n| 4.3L4 | 4.3LX Alpha One |\n| 5.7L | 5.7L Alpha One |\n| SRX 5.7L | 350 Magnum Alpha One |\n| SRX 7.4L | 454 Magnum Alpha One |\n\nii 90-12934--2 1097  \nNotice  \nThroughout this publication,“Warnings” and “Cautions” (accompanied by the International HAZARD symbol ! ) are used to alert the mechanic to special instructions concerning a particular service or operation that may be hazardous if performed incorrectly or carelessly.— OBSERVE THEM CAREFULLY! These “Safety Alerts” alone cannot eliminate the hazards that they signal. Strict compliance to these special instructions when performing the service, plus “common sense” operation, are major accident prevention measures.  \n\n|  |  ! DANGER |\n| --- | --- |\n\nDANGER-Immediate hazards which will result in severe personal injury or death.  \n\n|  |  ! WARNING |\n| --- | --- |\n\nWARNING - Hazards or unsafe practices which COULD result in severe personal injury or death.  \n\n|  |  ! CAUTION |\n| --- | --- |\n\nCAUTION - Hazards or unsafe practices which could result in minor personal injury or product or property damage.  \nIMPORTANT: Indicates information or instructions that are necessary for proper operation and/or maintenance.  \nNotice To Users of This Manual  \nThis service manual has been written and published by the service department of the manufacturer to aid our dealers’ mechanics and company service personnel when servicing the product described herein. It is assumed that these personnel are familiar with the servicing procedures of this product, or like or similar products. That they have been trained in the recommended servicing procedures of these products which includes the use of mechanics’ common hand tools from other suppliers.  \nWe could not possibly know of and advis","cbCaitq0Mk7FEJc7","https://ap.wps.com/l/cbCaitq0Mk7FEJc7","pdf",582783,23,"English","# Notice\n## Safety Alerts (DANGER / WARNING / CAUTION)\n# Models Covered in This Manual\n## Transom Assemblies\n# Sterndrive Units\n## MC 120R-260R\n## MC 120 MR-300 Tempest MR\n## MC Alpha One / Alpha One SS\n# Sea Ray (Oyster White) Cross-Reference\n# Replacement Parts\n## Electrical system warnings\n# Service Manual Outline\n## Section 1-Important Information\n## Section 2-Removal, Installation and Adjustments","[{\"question\":\"What safety guidance does the manual highlight for service work?\",\"answer\":\"It emphasizes observing “Warnings” and “Cautions” with the hazard symbol, following safety-alert instructions carefully, and using common-sense operation to prevent accidents.\"},{\"question\":\"How are sterndrive gear ratios linked to serial numbers in the manual?\",\"answer\":\"The manual lists original ratios and ratios when serviced with specified gear sets, and then provides serial-number ranges that correspond to each ratio set.\"},{\"question\":\"What cross-reference is provided for Sea Ray (Oyster White) sterndrives?\",\"answer\":\"It instructs that repairs to Sea Ray (Oyster White) sterndrives should follow procedures for the corresponding MerCruiser models shown in the cross-reference chart.\"}]","Mercruiser Sterndrive 123 | PDF",1792790856,58]