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Cummins/Onan — TABLE OF CONTENTS

For these Cummins/Onan models: 6JB, 7.5JB, J-Series (2-cylinder), J-Series (4-cylinder), JC.

Applies to: Cummins Onan 6Jb, Cummins Onan 7 5Jb

Procedure

  1. Specification (Spec Letter). Advances with factory production modifications. 76S JO-3R/4703 e SR ot Ame sae Div Vine 3T Bo Sovth Mernelan , Com”, oO 203-23 77 S54! . qwt OD bh TN ae S74 x2 x te 32g x Be y og x a aig x St ler : | SPECIFICATIONS NOMINAL DIMENSIONS OF PLANT (INCHES) ~ 50 CYCLE 5.0]B8 5.058 6.51B | 6.1JB 6.0)B 6.0JB 10.0JC 12.5)C 60 CYCLE 6.0JB 6.9]B 7.658 7.6$B 7.5J8 7.53 12.5JC I5.0JC STARTING : METHOD Manual Remote Manual Remote Manual Remote Remote Remote HEIGHT 25
  2. Installation with duct size too small so air flow is insufficient.
  3. Installation in small room with no ducts and insufficient air ventilation in the room.
  4. Installation of air inlet and outlet ducts so air outlet feeds back to the inlet. . AIR SHUTTER (Optional) , The shutter assembly mounts on the engine air outlet on the right side of the cylinder shroud (Fig. 2). A thermostatic element (Fig. 3) controls the shutter closing which limits air flow when the engine is cold. When the air temperature reaches 120°F the element plunger begins to move outward, opening the shutters. The shutters are completely open by 140°F. ~ ACCESS DOOR BLOWER | HOUS

Source: manual:967-0500 Onan JB JC (spec A-T) Genset Service manual MAGNECITER END (11-1971).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.