{"product_id":"skeg-guard-for-mercruiser-alpha-i-1985-1990-replaces-27021","title":"Skeg Guard for MerCruiser Alpha I 1985-1990 (Replaces 27021)","description":"\u003cp\u003eThis JLM Marine stainless steel skeg guard (SKU JLM1907) repairs or protects the skeg on \u003cstrong\u003eMerCruiser Alpha One (Gen I) sterndrives, model years 1985–1990\u003c\/strong\u003e, and is sold as an aftermarket alternative to reference numbers JLM\u003cstrong\u003e27021\u003c\/strong\u003e (Megaware SkegGuard) and \u003cstrong\u003e35-SS605\u003c\/strong\u003e (Panther Safe-Skeg). It bolts over a new or already broken skeg, so you can avoid welding or replacing the entire lower unit.\u003c\/p\u003e\n\u003ch2\u003eProduct Video\u003c\/h2\u003e\n\u003cp\u003eWatch this quick overview of the JLM Marine 1907 skeg guard: what it fixes, which MerCruiser Alpha One Gen I drives (1985–1990) it fits, the no-weld bolt-on installation, and everything included in the kit.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; justify-content: center; margin: 16px 0;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/QND76qP-j3Q\" title=\"JLM Marine 1907 Stainless Steel Skeg Guard for MerCruiser Alpha One Gen I 1985-1990 – Product Video\" style=\"width: 100%; max-width: 360px; aspect-ratio: 9\/16; border: 0; border-radius: 8px;\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003ch2\u003eFitment Warning\u003c\/h2\u003e\n\u003cp\u003eThe model years 1985–1990 refer to the \u003cstrong\u003eAlpha One first-generation (Gen I) drive only\u003c\/strong\u003e. Do not order by brand name alone: MerCruiser used several drives with different skeg shapes, and this guard does not fit the earlier MerCruiser 1\/R (“Pre-Alpha”) drives or the Alpha One Generation II introduced in 1991. Identify your exact drive generation and year before ordering.\u003c\/p\u003e\n\u003ch2\u003eCompatible Models\u003c\/h2\u003e\n\u003cp\u003eBoth cross-reference numbers are published by their respective manufacturers for the same application range, listed separately below.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eReference Number\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eReference Brand\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eDrive\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eModel Years\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e27021\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMegaware SkegGuard\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMerCruiser Alpha One (Gen I) sterndrive\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e1985–1990\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e35-SS605\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003ePanther Safe-Skeg\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMerCruiser Alpha One (Gen I) drives\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e1985–1990\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 0.9em; color: #555;\"\u003eFitment ranges above follow the Megaware SkegGuard Model Guide (9-2023 edition) and the Panther Safe-Skeg fitment guide as accessed in July 2026. Always confirm your exact drive model, gearcase, and skeg outline against the product photos before purchase. 27021 and 35-SS605 are aftermarket reference numbers, not Mercury Marine OEM part numbers.\u003c\/p\u003e\n\u003ch2\u003eKnown Exclusions\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eDrive You Have\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eFits This Guard?\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eCorrect Reference Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMerCruiser 1\/R “Pre-Alpha” drives, 1973–1984\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e27011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMerCruiser Alpha One Generation II, 1991–present\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e27031\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMerCruiser Bravo One \u0026amp; Bravo Three, 1990–present\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eNo\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e27051\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003eA quick visual check: Alpha One Gen I drives have two studs with nuts under the ventilation plate just above the propeller; Alpha One Gen II drives do not. If your boat is a 1990–1991 model year, verify the drive generation by serial number rather than by year alone.\u003c\/p\u003e\n\u003ch2\u003eBefore Ordering\u003c\/h2\u003e\n\u003cp\u003eConfirm the following on your boat: the drive is an Alpha One Gen I from 1985–1990; at least 2 to 3 inches of the upper skeg remain intact to anchor the guard; and the outline of your skeg matches the guard shape shown in the product photos. If your skeg is broken off higher than that, this bolt-on guard cannot be secured and a weld-on repair may be required instead.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 6px; text-align: left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eProduct type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eBolt-on skeg guard \/ skeg repair plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e316 marine-grade stainless steel, laser-marked “Marine Grade SS316” on the plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eFinish\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMirror-polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eTwo pre-drilled holes; requires drilling two 1\/4″ holes through the existing skeg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eDesign features\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eDrain hole to release trapped water and reduce corrosion and freeze damage; reinforced lower wear edge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003eJLM model number\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 6px;\"\u003e1907 (engraved on the plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x stainless steel skeg guard (model 1907)\u003c\/li\u003e\n\u003cli\u003e4 x stainless steel mounting bolts, pre-coated with thread locker\u003c\/li\u003e\n\u003cli\u003e2 x stainless steel barrel nuts\u003c\/li\u003e\n\u003cli\u003e2 x Allen wrenches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHardware shown is based on JLM product photos of this kit. If any listed item is missing from your package, contact us before installation.\u003c\/p\u003e\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eInstallation is a straightforward bolt-on job for most owners with basic tools. The boat must be out of the water, and you will need an electric drill with a 1\/4″ bit.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eCheck that at least 2 to 3 inches of the upper skeg remain to hold the guard securely.\u003c\/li\u003e\n\u003cli\u003eClean the existing skeg surface so it is free of paint flakes, marine growth, and debris.\u003c\/li\u003e\n\u003cli\u003eSlide the guard over the skeg and seat it fully, tapping gently with a rubber mallet if needed.\u003c\/li\u003e\n\u003cli\u003eUsing the two pre-drilled holes in the guard as pilots, drill through the skeg with a 1\/4″ drill bit.\u003c\/li\u003e\n\u003cli\u003eInsert the supplied bolts (pre-coated with thread locker) through the guard and skeg into the barrel nuts.\u003c\/li\u003e\n\u003cli\u003eTighten evenly with the supplied Allen wrenches until the guard sits firmly without gaps.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIf the skeg is severely deformed or the guard cannot seat flush, stop and consult a marine technician instead of forcing the fit.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my MerCruiser drive?\u003c\/strong\u003e\u003cbr\u003eIt fits Alpha One first-generation drives from 1985–1990 only. Check your drive generation and serial number, then compare your skeg outline with the product photos. For Gen II (1991+) use reference 27031; for 1973–1984 Pre-Alpha drives use reference 27011.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I install it on an already broken skeg?\u003c\/strong\u003e\u003cbr\u003eYes. The guard is designed to cover a damaged or partially missing skeg, as long as at least 2 to 3 inches of the upper skeg remain to anchor the mounting hardware.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the drain hole for?\u003c\/strong\u003e\u003cbr\u003eThe drain hole lets water escape from between the guard and the skeg. This prevents trapped water from causing hidden corrosion or freeze damage in cold climates.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this an original Mercury Marine part?\u003c\/strong\u003e\u003cbr\u003eNo. This is an aftermarket accessory made by JLM Marine. The numbers 27021 and 35-SS605 are cross-reference numbers of comparable aftermarket skeg guards, not Mercury OEM part numbers.\u003c\/p\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not manufactured, endorsed, or warranted by Mercury Marine, Megaware, or Panther. All brand names and reference numbers are used for compatibility identification only.\u003c\/li\u003e\n\u003cli\u003eVerify that the product photos and specifications match your original skeg before purchase. If anything looks different—even if your drive appears in the fitment table—contact us with photos of your lower unit and we will confirm fitment.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51310653440313,"sku":"1907","price":73.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/mercruiser-alpha-one-skeg-guard-1985-1990-replaces-27021-35-ss605.jpg?v=1785312292","url":"https:\/\/jlmmarine.com\/ru\/products\/skeg-guard-for-mercruiser-alpha-i-1985-1990-replaces-27021","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}