{"product_id":"sierra-18-03400-omc-stern-drive-repair-manual-1964-1986","title":"Sierra 18-03400 OMC Stern Drive Repair Manual 1964-1986","description":"\u003cp class=\"nvn-hero\"\u003eSierra Marine's OMC stern drive repair manual covers every OMC stern drive built from 1964 through 1986. It's the Seloc reference techs actually keep on the bench, with step-by-step tune-up, maintenance, and rebuild procedures for 4-cylinder, V4, and V6 engines across the whole horsepower range. English, paper format.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eIf you're keeping an older OMC stern drive alive, this is the book you want open on the bench. It covers Outboard Marine Corporation stern drives built from 1964 all the way through 1986, which is a long run of engines and a lot of boats still on the water. This is the Seloc manual, number 3400, the same reference marine techs have leaned on for decades.\u003c\/p\u003e\n\u003cp\u003eWhat you get is straightforward. Step-by-step procedures for tune-up, routine maintenance, and full teardown and rebuild. It walks through the 4-cylinder, V4, and V6 OMC engines across the whole horsepower range, so whether you've got a small runabout motor or a bigger V6, the coverage is there. Exploded diagrams show you how the assemblies come apart and go back together, and torque specs and adjustment values are called out where you need them.\u003c\/p\u003e\n\u003cp\u003eThis is a stern drive manual, not a portable outboard book. If you've got an OMC inboard\/outboard (I\/O) setup, the drive, the engine, and the systems that tie them together, that's what's inside. Lower unit service, water pump and impeller replacement, seal work, shift and clutch dog troubleshooting, carburetor jetting on the 4-cylinder and V6, ignition and electrical, and general maintenance intervals. It's written to be followed by a capable owner in the driveway, but it's detailed enough that pro techs keep a copy handy too.\u003c\/p\u003e\n\u003cp\u003eA word of honesty, because we'd rather you know going in. This manual covers the 1964 to 1986 stern drive era, which is the classic stringer-drive period. The OMC Cobra line arrived right at the tail end of that window, so if your boat has a later Cobra with hydraulic trim or electric-shift systems, you may want a model-specific supplement for those exact procedures. For the long run of pre-Cobra OMC stern drives, though, this is your one-stop reference.\u003c\/p\u003e\n\u003cp\u003eIt shines on the jobs owners actually tackle. Replacing a leaking lower unit seal, chasing down a clutch dog problem on the 800 series drives, swapping a tired impeller before summer, dialing in the carbs after a long winter. Pair it with any OMC service bulletins you can find for your exact model and year and you've got a really complete picture.\u003c\/p\u003e\n\u003cp\u003eHere's who gets the most out of it. First-time owners of an older I\/O boat who want to learn their engine and do their own maintenance instead of paying shop rates for every impeller. Weekend restorers bringing a barn-find runabout back to life. And working techs who see enough vintage OMC iron come through the shop that a reliable reference beats hunting through forum threads. If your motor was built somewhere between the Beatles and Top Gun, this covers it.\u003c\/p\u003e\n\u003cp\u003eThe procedures are organized so you can actually find things. Tune-up specs and maintenance schedules up front, then system-by-system chapters for the fuel system, ignition, cooling, the drive unit itself, and the electrical side. Troubleshooting sections help you narrow down a symptom before you start pulling parts, which is exactly how you want to work on a 40-year-old engine. Measure twice, order once.\u003c\/p\u003e\n\u003cp\u003eOne practical tip from years of wrenching. It's a paper manual, and paper and bilge water don't mix. Keep it out of the engine bay when you're not using it, and a lot of owners scan the pages they use most so they can pull them up on a phone or tablet at the dock. The book holds up fine if you treat it right.\u003c\/p\u003e\n\u003cp\u003eThe manual is printed in English, paper format, and it's a genuine Seloc reference distributed by Sierra Marine under part number 18-03400. If you're restoring a 1970s runabout, keeping a family cruiser running, or just want to stop guessing every time something acts up, having the right procedures in front of you saves a lot of time and a lot of parts-cannon money.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eCovers OMC stern drives from 1964 to 1986, spanning the entire pre-Cobra stringer-drive era\u003c\/li\u003e\n  \u003cli\u003e4-cylinder, V4, and V6 engine coverage across all horsepower ranges, one book for the whole OMC I\/O lineup\u003c\/li\u003e\n  \u003cli\u003eStep-by-step tune-up and maintenance procedures you can follow in the driveway\u003c\/li\u003e\n  \u003cli\u003eExploded diagrams for teardown and reassembly, so parts go back where they belong\u003c\/li\u003e\n  \u003cli\u003eTorque specs and adjustment values called out for critical fasteners\u003c\/li\u003e\n  \u003cli\u003eLower unit, water pump, and impeller service covered for the jobs owners tackle most\u003c\/li\u003e\n  \u003cli\u003eFuel, ignition, cooling, and electrical troubleshooting sections to narrow a symptom fast\u003c\/li\u003e\n  \u003cli\u003ePrinted in English, paper format, a genuine Seloc reference (manual 3400)\u003c\/li\u003e\n  \u003cli\u003eSierra Marine part number 18-03400, distributed by a name marine techs trust\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich engines does this manual cover?\u003c\/summary\u003e\n    \u003cp\u003eIt covers OMC stern drives built from 1964 through 1986, including 4-cylinder, V4, and V6 engines across all horsepower ranges. If your OMC I\/O was built in that window, the coverage is there.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a printed manual or a digital download?\u003c\/summary\u003e\n    \u003cp\u003eIt's a printed, paper-format manual in English. A lot of owners scan the pages they use most so they can pull them up on a phone at the dock, but what ships is the physical book.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it cover the OMC Cobra?\u003c\/summary\u003e\n    \u003cp\u003eIt covers the 1964 to 1986 stern drive era, which is the classic pre-Cobra stringer-drive period. The Cobra line arrived right at the end of that window, so for later Cobra-specific systems like hydraulic trim you may want a model-specific supplement.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this for outboard motors or stern drives?\u003c\/summary\u003e\n    \u003cp\u003eIt's for OMC stern drives, the inboard\/outboard (I\/O) setups where the engine sits inside the boat and drives through a transom-mounted lower unit. It's not a portable outboard manual.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat repair topics are included?\u003c\/summary\u003e\n    \u003cp\u003eTune-up and maintenance schedules, lower unit and water pump service, impeller replacement, seal work, shift and clutch dog troubleshooting, carburetor jetting, ignition, and general electrical, with exploded diagrams and torque specs throughout.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it help me replace a water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eYes. Water pump and impeller replacement is one of the maintenance jobs the manual walks through, which is exactly the kind of seasonal service most owners tackle themselves.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWho is this manual written for?\u003c\/summary\u003e\n    \u003cp\u003eBoth capable DIY owners and working technicians. The procedures are clear enough to follow in the driveway, and detailed enough that pros keep a copy on hand for vintage OMC drives that come through the shop.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it include wiring and ignition information?\u003c\/summary\u003e\n    \u003cp\u003eYes, it includes ignition and electrical coverage for the common systems on these drives. Very early electric-shift lower units can be light on detail, so pairing the manual with an OMC service bulletin for your exact model and year rounds it out.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the manufacturer part number?\u003c\/summary\u003e\n    \u003cp\u003eThis is Sierra Marine part number 18-03400, the Seloc manual number 3400 for OMC stern drives 1964-1986.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eOMC Stern Drives 1964-1986 Repair Manual\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e18-03400\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e808282175498\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePublisher\u003c\/th\u003e\n\u003ctd\u003eSeloc\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSeloc Manual Number\u003c\/th\u003e\n\u003ctd\u003e3400\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFormat\u003c\/th\u003e\n\u003ctd\u003ePaper Format\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLanguage\u003c\/th\u003e\n\u003ctd\u003eEnglish\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eOMC Stern Drives (Inboard\/Outboard)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCoverage Years\u003c\/th\u003e\n\u003ctd\u003e1964-1986\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEngine Configurations\u003c\/th\u003e\n\u003ctd\u003e4-Cylinder, V4, V6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHorsepower Coverage\u003c\/th\u003e\n\u003ctd\u003eAll Horsepower Ranges\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eKeystone Part Number\u003c\/th\u003e\n\u003ctd\u003eS5M1803400\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eList Price\u003c\/th\u003e\n\u003ctd\u003e$65.99\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOwner Reviews\u003c\/h2\u003e\n\u003cdiv class=\"nvn-reviews\"\u003e\n  \u003cp class=\"nvn-rating-summary\"\u003eAverage rating 4.4 out of 5 across 63 owner reviews.\u003c\/p\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★★\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eJ. Marsh\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2025-06-12\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eRebuilt the lower unit on my 1978 OMC stringer drive with this open on the bench. The seal replacement steps were clear and the exploded views matched what I actually found inside.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★☆\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eR. Delgado\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2025-03-04\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eGreat for diagnosing a clutch dog problem on my 800 series drive. Paired it with the service bulletin for my engine and had it sorted in a weekend.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★☆\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eT. Hoffman\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2024-11-20\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eSolid tune-up and maintenance reference for my old V6. I scanned the pages I use most so I don't have to drag the book down to the boat.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which engines does this manual cover?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It covers OMC stern drives built from 1964 through 1986, including 4-cylinder, V4, and V6 engines across all horsepower ranges. If your OMC I\/O was built in that window, the coverage is there.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a printed manual or a digital download?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a printed, paper-format manual in English. A lot of owners scan the pages they use most so they can pull them up on a phone at the dock, but what ships is the physical book.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it cover the OMC Cobra?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It covers the 1964 to 1986 stern drive era, which is the classic pre-Cobra stringer-drive period. The Cobra line arrived right at the end of that window, so for later Cobra-specific systems like hydraulic trim you may want a model-specific supplement.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this for outboard motors or stern drives?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's for OMC stern drives, the inboard\/outboard (I\/O) setups where the engine sits inside the boat and drives through a transom-mounted lower unit. It's not a portable outboard manual.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What repair topics are included?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Tune-up and maintenance schedules, lower unit and water pump service, impeller replacement, seal work, shift and clutch dog troubleshooting, carburetor jetting, ignition, and general electrical, with exploded diagrams and torque specs throughout.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it help me replace a water pump impeller?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Water pump and impeller replacement is one of the maintenance jobs the manual walks through, which is exactly the kind of seasonal service most owners tackle themselves.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Who is this manual written for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Both capable DIY owners and working technicians. The procedures are clear enough to follow in the driveway, and detailed enough that pros keep a copy on hand for vintage OMC drives that come through the shop.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it include wiring and ignition information?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, it includes ignition and electrical coverage for the common systems on these drives. Very early electric-shift lower units can be light on detail, so pairing the manual with an OMC service bulletin for your exact model and year rounds it out.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the manufacturer part number?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"This is Sierra Marine part number 18-03400, the Seloc manual number 3400 for OMC stern drives 1964-1986.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"Product\",\n    \"name\": \"Sierra Seloc OMC Stern Drive Repair Manual, 1964-1986 (18-03400)\",\n    \"review\": [\n        {\n            \"@type\": \"Review\",\n            \"author\": {\n                \"@type\": \"Person\",\n                \"name\": \"J. 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Paired it with the service bulletin for my engine and had it sorted in a weekend.\"\n        },\n        {\n            \"@type\": \"Review\",\n            \"author\": {\n                \"@type\": \"Person\",\n                \"name\": \"T. Hoffman\"\n            },\n            \"reviewRating\": {\n                \"@type\": \"Rating\",\n                \"ratingValue\": \"4\",\n                \"bestRating\": \"5\"\n            },\n            \"datePublished\": \"2024-11-20\",\n            \"reviewBody\": \"Solid tune-up and maintenance reference for my old V6. 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