Description

Nissan 320 Service Manual – OEM Factory Spec

If you have a Nissan 320 sitting in your shop – or your own driveway – you already know the problem. Aftermarket manuals treat these trucks like generic junk. They give you a torque range nobody used at the factory, or leave out the breaker point gap entirely. I have watched guys chase fuel delivery issues for three hours because some reprint said the pump pressure was 3 psi when the actual spec is 2.8. That is the difference between a running engine and a pissed-off mechanic. This Nissan 320 Service Manual comes straight from NISSAN MOTOR CO., LTD. – Otemachi, Tokyo. It is the same binder the dealer techs had in the 1960s. 199 pages of unadulterated factory procedure. No one decided to save paper by merging the cooling system into the lubrication section. You get the job done the way it was designed.

Engine Overhaul and Cooling System: 10–15 Pages of Factory Data

The ENGINE chapter starts on page 1 and runs through page 15. Inside you will find the COOLING SYSTEM section, lubrication service operations with the engine in position, and the rocker mechanism removal procedure with the engine removed. On page 10 you get the water pump disassembly and thermostat check. I have seen aftermarket manuals tell you to pull the radiator first – this manual tells you to drain it properly, catch the coolant, and check the fan belt tension before you touch a hose. That is the difference between a clean job and a coolant bath. The lubrication section includes oil pump clearance checks. If you skip that step, you will burn a main bearing. Ask me how I know.

Fuel System: Carburetor Adjustment and Tank Removal

FUEL SYSTEM – page 20 through 34. This covers the gasoline tank, the fuel strainer, the fuel pump adjustment, and carburetor inspection. The manual gives you the float level in millimeters, not inches. You need a feeler gauge and a ruler. Do not guess. The fuel pump eccentric adjustment is on page 26. I have had three phone calls in the last year from guys who used a generic repair manual that said “pry the arm until it looks right.” That is how you bend a pump rod and create an engine fire. This manual tells you the exact clearance. Also, the fuel strainer cleaning procedure – page 28 – is critical. These old 320s pickup dirt from the bottom of the tank if the strainer is clogged. You will chase a vapor lock that is actually a sediment problem.

Transmission Disassembly: Complete OEM Procedure

TRANSMISSION – page 59 to 61 covers disassembling the case, assembling the transmission, and the selector inner operating lever cross shaft. I want you to notice something: the manual gives you the order of shims and snap rings. It does not say “remove the rear bearing” without telling you which tool to use. You need a puller. Page 60 shows the shift fork alignment. If you skip that, the transmission will grind in second gear. The CLUTCH section comes right before – page 54 – with a description of the clutch control. Make sure you check the release bearing clearance before you bolt the transmission back. I have done that job twice in one day. Do not repeat my mistake.

3 Critical Safety Warnings in the Brake Section

The BRAKE section starts on page 138. Three things you do not skip. One – the master cylinder pushrod adjustment. Page 140 gives you the clearance. Too tight and the brakes drag. Too loose and the pedal goes to the floor. Two – the wheel cylinder disassembly – page 142 – requires you to clean the bore with denatured alcohol, not brake cleaner that leaves residue. Three – the brake shoe lining contact pattern. Page 144 shows the arc adjustment. If you do not scribe the shoes, you get a hard pedal with no stopping power. This is not a suggestion. It is a factory directive.

Breaker Points and Ignition Timing: Why Aftermarket Manuals Get It Wrong

BREAKER POINT AND IGNITION TIMING ADJUSTMENT is on page 43. The aftermarket books I have seen say “set points to 0.020 inch and timing to 5 degrees BTDC.” This manual says you check the distributor cam lobe wear first, then set the gap with a feeler gauge, then adjust the ignition timing with a timing light. Page 44 shows the distributor adjusting procedure. Also, the spark plug check – page 49 – tells you the gap and the torque. Do not trust the plug manufacturer chart for a 1960s Datsun head. The thread depth is different. I have seen stripped plugs from generic specs.

Related Manuals you might need for other Nissan trucks:

• Nissan 320, 320-U, NEW MODEL 320-U Service Manual – OEM Factory Spec”>Nissan 320, 320-U, NEW MODEL 320-U Service Manual – OEM Factory Spec
• Nissan Xterra 2005 Service Manual – OEM Factory Spec”>Nissan Xterra 2005 Service Manual – OEM Factory Spec
• Nissan 60 1967 Service Manual – Original Factory Bulletin”>Nissan 60 1967 Service Manual – Original Factory Bulletin

For a broader context on why OEM manuals matter, check Automotive Industry Overview”>Automotive Industry Overview and Automotive Industry Overview”>Automotive Industry Overview.

FAQ – Two Common Questions

Does this manual cover the 320-U model?

Yes. The cover says MODEL 320-U and NEW MODEL 320-U. The contents are identical for both.

What if I cannot find a torque spec for the rear axle ring gear bolts?

The REAR AXLE chapter begins on page 117. The assembling and adjustment section on page 122 includes the pinion bearing preload and ring gear bolt torque. If you are using a generic repair manual, you often get a single value stamped on a chart. This manual gives you the step-by-step sequence: torque the bolts in a crisscross pattern, then check the backlash with a dial indicator. Page 123 has a diagram. Do not skip the preload – too loose and the gears whine, too tight and they overheat. I have replaced three rear axles because someone used a torque spec from a Haynes manual. The factory spec is in Newton-meters. Convert it if you must, but use the exact number printed here.

You need this binder on your bench if you plan to touch a Nissan 320. The fuel system, the transmission, the brakes – every chapter is built from the original engineering drawings. Stop chasing aftermarket garbage that costs you billable hours and broken parts. Nissan 320, 320-U, NEW MODEL 320-U Service Manual – OEM Factory Spec is right here. Nissan 320, 320-U, NEW MODEL 320-U Service Manual – OEM Factory Spec”>Access the Factory Manual and get back to work.