{"product_id":"drivetrain-alignment-shaft-record-pdf","title":"Drivetrain Alignment \u0026 Shaft Record PDF — Coupling, Runout \u0026 Stern Gear Log","description":"\u003cp style=\"font-size:1.05em;line-height:1.7;\"\u003e\u003cstrong\u003eA misaligned drivetrain destroys a gearbox, a cutless bearing and a stern tube — in that order, quietly, over two seasons.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIt is also one of the few faults on a boat that leaves a paper trail if anyone bothers to keep one. A coupling gap measured at four quadrants, dated, with the hours and the conditions beside it, tells you whether the shaft line has moved. The same measurement taken once and remembered vaguely tells you nothing at all.\u003c\/p\u003e\n\n\u003cp\u003eThis is that record. A reference page you fill in from your own documentation, then measurement sessions kept across years, with a column in every one of them for who held the gauge.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#0A3F5C;border-left:4px solid #C5A059;border-radius:4px;padding:22px 24px;margin:26px 0;color:#F7F9FA;\"\u003e\n  \u003cp style=\"margin:0 0 4px;font-size:0.72em;letter-spacing:0.14em;text-transform:uppercase;color:#C5A059;font-weight:700;\"\u003eWhat you receive\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 14px;font-size:1.25em;line-height:1.35;color:#FFFFFF;\"\u003eA seven-part record for the life of the drivetrain\u003c\/p\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;color:#DCE6EC;\"\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 22-line reference page\u003c\/strong\u003e for the tolerances, torques and specifications you transcribe, with the source and page beside each\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 16-line preparation page\u003c\/strong\u003e — afloat or ashore, settling time, tankage, mast, temperature: the conditions that decide whether two sessions can be compared\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eSix four-quadrant coupling sessions\u003c\/strong\u003e with both variances computed, never an average\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eShaft runout and flange metrology\u003c\/strong\u003e — TIR, face runout, spigot concentricity, with the angular position of the high point\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eCutless bearing play over eight sessions\u003c\/strong\u003e, with the method recorded, because push-pull and dial indicator do not agree\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eSix calculation models\u003c\/strong\u003e for TIR, quadrant variance, angular misalignment, parallel offset, deviation and wear rate\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eYou measure. Your yard adjusts.\u003c\/h3\u003e\n\u003cp\u003eReading a dial indicator and slipping feeler gauges into a coupling gap are within reach of a careful owner. Adjusting an alignment is not: it means jacking engine mounts against a shaft line, it is easy to make worse, and the cost of getting it wrong is a gearbox.\u003c\/p\u003e\n\u003cp\u003eSo this document is built to sit on both sides of that line. It records what you measured and what your yard measured, with the name in every session. Used before a lift, it tells your engineer exactly where to look. Used after, it proves what changed — and the vibration page, recorded at the same RPM before and after, lets the work be judged on something other than an invoice.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#F7F9FA;border:1px solid #E1E8EC;border-left:4px solid #A2803C;border-radius:4px;padding:20px 22px;margin:26px 0;\"\u003e\n  \u003cp style=\"margin:0 0 6px;color:#0A3F5C;font-weight:700;\"\u003eNot one published tolerance. Deliberately.\u003c\/p\u003e\n  \u003cp style=\"margin:0;line-height:1.7;\"\u003eYou will not find a runout limit, a bearing play figure or a torque value of our own anywhere in this document. They differ between builders, between shaft diameters, between bearing types and between gearbox models. A runout limit in thousandths of an inch and one in hundredths of a millimetre are easy to confuse under an engine, and the confusion costs a gearbox. Transcribe yours from your own documentation onto the reference page, record the document, and let model D5 do the comparison.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTwo variances, never an average\u003c\/h3\u003e\n\u003cp\u003eA drivetrain can sit comfortably inside tolerance on the vertical axis and outside it on the horizontal. Averaging four coupling gaps into one number hides exactly that, which is why this record asks for all four and computes both variances separately — then converts them into an angle and a parallel offset, because angular misalignment and parallel offset are different faults with different causes.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWho it is for\u003c\/h3\u003e\n\u003cul style=\"line-height:1.75;\"\u003e\n  \u003cli\u003eOwners who have just had an alignment done and want it documented properly\u003c\/li\u003e\n  \u003cli\u003eOwners chasing a vibration nobody can pin down\u003c\/li\u003e\n  \u003cli\u003eAnyone tracking cutless bearing play towards a planned lift rather than an unplanned one\u003c\/li\u003e\n  \u003cli\u003eBuyers and sellers who want the drivetrain history to be more than a verbal assurance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;margin:12px 0 4px;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;width:42%;\"\u003eProduct ID\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAML-MECH-2026-02\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eExtent\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e24 pages · 7 parts · 6 calculation models\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRegister lines\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e109 across reference, preparation, measurement, stern gear and work\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInteractivity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e518 live PDF form fields — 54 tick boxes and 464 entry fields\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eFormats included\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA4 and US Letter, both fillable and print-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInstallations\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eShaft drive, any diameter — the document carries no installation-specific data\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eUnits\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eUnit-neutral — you set them and record which you used\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eOffline\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eNo app, no account, no connection required once downloaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWhat it is not\u003c\/h3\u003e\n\u003cp\u003eThis document records, structures and compares measurements that you or your engineer take. It publishes no tolerance, no wear limit and no torque figure, and it reaches no conclusion about any installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlignment adjustment is not an owner task.\u003c\/strong\u003e Nothing in this document instructs you to slacken, jack or adjust an engine mount, to move a shaft line, or to dismantle any part of a drivetrain. Where a reading falls outside the limit you transcribed, the next step belongs to a qualified marine engineer working from the builder's own procedure for your installation.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:26px;\"\u003e\u003cstrong style=\"color:#0A3F5C;\"\u003eInstant download.\u003c\/strong\u003e Your links appear on screen the moment payment clears, and arrive by email within a minute. They do not expire.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#5C6B75;line-height:1.65;margin-top:22px;border-top:1px solid #E1E8EC;padding-top:16px;\"\u003e\u003cem\u003e2026 Captain's Edition · Revision 1.0 · AML-MECH-2026-02. Apex Marine Labs designs the organisational process behind good seamanship. Our documents record and organise; they do not replace a certified marine survey, a service manual, or a qualified marine engineer.\u003c\/em\u003e\u003c\/p\u003e","brand":"Apex Marine Labs","offers":[{"title":"2026 Captain's Edition","offer_id":56014076575912,"sku":"AML-MECH-2026-02","price":97.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/1161\/2072\/files\/apex-drivetrain-record-01-cover.webp?v=1789747403","url":"https:\/\/apexmarinelabs.com\/products\/drivetrain-alignment-shaft-record-pdf","provider":"Apex Marine Labs","version":"1.0","type":"link"}