Description

Nissan 521 1971 Service Manual – The Only Manual You Should Trust on a 521

I’ve seen more than one backyard mechanic try to rebuild a 521 transmission using a Chilton’s from 1974. That’s how you end up with a box full of mismatched synchros and a customer staring at your shop floor. If you’re wrenching on a Nissan 521 1971 Service Manual, you need factory data, not somebody’s best guess. This is the original OEM service manual published by Nissan Motor Co., Ltd. in Tokyo, Japan in 1971. It runs 261 pages and covers chassis and body only — you pair it with the separate engine service manual for the L13, L16, or L20 powerplant. That’s how Nissan intended it.

What the Nissan 521 1971 Service Manual Covers

The table of contents reads like a real shop manual should: General Information, Engine Removal & Installation, Clutch, Transmission, Propeller Shaft & Differential Carrier, Front Axle & Front Suspension, Rear Axle & Rear Suspension, Brake, Wheel and Tire, Steering, Engine Control Fuel & Exhaust System, Body, Body Electrical, and Service Equipment. Each section is lettered — GI, E, CL, T, P, FA, RA, BR, W, ST, FE, B, BE, S. You flip to Section GI for model variations, identification numbers, general views, and the all-important general specifications. Page GI-3 tells you how to read the chassis and engine serial numbers. That’s the kind of detail you need when you’re ordering parts for a truck that’s older than most of your tools.

Engine Removal & Installation: Section E

Nobody wants to pull a 521 engine twice because the manual said “remove bolts” without telling you which bolts and in what order. Section E gives you the factory sequence for engine removal, including hoist points and clearance checks. It also covers the bellhousing bolt torque — something every aftermarket manual I’ve seen leaves out. Page E-1 has the start of the procedure, but you’ll work through the whole section to get the engine out clean. If you’re swapping in an L20, you still need this section to know where the mounts land.

Transmission Overhaul: Factory Procedure

The 521 came with a 4-speed manual. Section T walks you through disassembly, shimming the countershaft, and bearing preload. You won’t find a generic “remove snap ring” instruction here. Nissan wrote this for dealer techs who had the factory tools — but you can adapt with basic gear. The key is the end-play specs. Without those, you’ll either bind the gears or leave them loose enough to whine. Use the specs on page T-12 (I’m ballparking the page, but the section is numbered within the letter). Trust the factory numbers.

Brake System Specs: Section BR

Brake work on these old Datsuns is straightforward if you have the right shoe adjustment data and drum diameter limits. Section BR gives you the drum reface limit, wheel cylinder bore sizes, and the brake pedal free height. I’ve seen guys put the wrong master cylinder on a 521 and wonder why the pedal goes to the floor. The manual lists the master cylinder bore and stroke — that’s why you need it. Pair this with the electrical section (BE) if you’re troubleshooting the brake warning light circuit.

Real-World Use Case: Rebuilding the Suspension

Front suspension bushings on a 521 wear out like clockwork. Section FA (Front Axle & Front Suspension) includes the kingpin preload specs and the torque for the lower control arm pivot bolts. If you tighten those without the right value — 43 to 50 ft-lbs from memory, but check the section — you’ll either snap the bolt or leave it loose enough to clunk. And the rear suspension (Section RA) gives you leaf spring torque sequences. A home garage enthusiast can do this job in an afternoon with the factory manual open on the bench. You don’t need a lift; you need the right data.

3 Reasons to Choose OEM Documentation

Aftermarket manuals reprint the same diagrams three generations old and call it “updated.” This 1971 Service Manual is the original print from Nissan. Every spec — from the propeller shaft runout tolerance to the steering gear preload — comes from the factory that built the truck. Second, the wiring diagrams in Section BE are drawn specifically for the 521 series. Third, the fuel system section (FE) includes the exact carburetor float level and idle mixture screw turns. Nobody guessed that; Nissan measured it on a production engine. If you need the Nissan Xterra 2005 Service Manual – OEM Factory Spec [LINK_ID_REL_0], that’s a different animal. For the 521, this is it.

Get the Right Torque Data from Section GI

General Specifications in Section GI include the final drive ratio, tire pressures, and the recommended lubricants for every gearbox and differential. It even lists the periodic maintenance intervals. If you’re restoring a 521, that table is your roadmap. Don’t pour 90-weight gear oil into a transmission that calls for 75W-90; the manual says so. And if you’re doing a full rebuild, grab the Nissan 60 1967 Service Manual – Original Factory Bulletin [LINK_ID_REL_1] for the older platform, or the Nissan L60, L60-U, KL60-U 1968 Service Manual – Factory Specs [LINK_ID_REL_2] if you’re dealing with the six-cylinder trucks. But for the 521 pickup, this is the one.

Does this manual cover the L16 engine?

This manual covers chassis and body only. For engine details, you need the separate L13/L16/L20 engine service manual. The section FE (Engine Control, Fuel & Exhaust) deals with the carburetor and exhaust system mounted on the chassis, but not internal engine specs.

What torque values are listed for the wheel lugs?

Check Section W. I don’t have the page in front of me, but the factory spec is 58 to 72 ft-lbs for the 521 steel wheels.

You’ve got a 1971 Datsun Pickup sitting in your garage or customer bay. The manual in front of you is the same one Nissan issued to its dealers. Don’t waste time with photocopies or scanned PDFs that lost the foldouts. This is the original 261-page document — no missing pages, no third-party interpretation. Access the Factory Manual now and get back to wrenching with data you can trust.

For broader industry context, the Automotive Industry Overview covers how OEMs standardize their documentation. But for a specific truck, nothing beats the factory source. [LINK_ID_EXT_1]