Fuel System - Service Specification Revisions: Overview

TS82-019

March 1, 1982

Engine Fuel

ENGINE FUEL, 310 A/T


Applied Model: 310 series with automatic transaxle


This bulletin contains data for the automatic transaxle equipped 310 model omitted from the previously issued 1982 DATSUN 310 SERVICE MANUAL.

Paste each of these pages over the same pages in your manual. Just dampen the backs of the attached pages.


See pages EF14-15 previously issued 310 Service Manual.

INSPECTION AND ADJUSTMENT

CARBURETOR IDLE RPM AND MIXTURE RATIO (U.S.A.)

The idle mixture adjusting screw which has been preset at the factory should be adjusted only in the event of a major carburetor overhaul, throttle body replacement or to lower exhaust emissions as directed by official inspections. The plug which seals this screw

should not be removed during routine maintenance. Adjusting mixture using other than the method below may violate Federal, or other state and Provincial laws.

Preparation

1. Make sure that the following parts are in good order.
^ Ignition system
^ Engine oil and coolant levels
^ Valve clearance

2. Connect engine tachometer and timing light in their proper positions.







3. On air conditioner equipped models, the air conditioner system should be "OFF".
4. Apply parking brake and block both front and rear wheels with chocks.
5. When measuring "CO" percentage, insert probe more than 40 cm (15.7 in) into tail pipe.


WARNING:
a. Inspections should be carried out while shift lever is in "D" position on automatic transaxle equipped models and in "Neutral" on manual transaxle equipped models.
b. On automatic transaxle equipped model, racing the engine should be carried out while shift lever is in "N" or "P" position and brake pedal should be depressed.
c. After adjustment has been made shift the lever to "N" or "P" position.

See page EF22-23 (Service Data and Specification) of previously issued 310 Service Manual.


Service Data and Specifications (S.D.S.) - ENGINE FUEL


7. Push connecting rod of diaphragm chamber and block passage of vacuum with finger. When connecting rod becomes free, check for leakage of air or damage to diaphragm.


Jets

Carburetor performance depends on jet and air bleeds. That is why these components must be fabricated with utmost care. To clean them, use


cleaning solvent and blow air on them. Larger inner numbers stamped on the jets indicate larger diameters. Accordingly, main and slow jets with larger numbers provide richer mixture; the smaller numbers the leaner mixture. Conversely, the main and slow air bleeds, through which air passes, make the fuel leaner if they bear larger numbers; the smaller numbers the richer the fuel.


ASSEMBLY

1. Thoroughly wash all the parts before assembling.
2. Inspect gaskets to see if they appear hard or brittle or if edges are torn or distorted. If any of such undesirable conditions is noted, they must be replaced.
3. Install jet and air bleed having the same size number as that of original one.
4. After reassembling carburetor, check each rotating portion or sliding portion for smooth operation.