Department of automobile engineering



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Figure 16 INJECTION PUMP

PRECAUTION:-

  1. Maintain absolute cleanliness in this job.

  2. Bring the speed of the test bench to minimum before stopping it.

  3. Set the speed when the machine is running.


Figure 17 ‘MERLING’ FUEL INFECTOR MACHINE



NO.

Faults

Causes

Remedies

(i)

Lose of power

  1. Incorrect fuel or dirty

Fuel.

  1. Restricted fuel system.

  2. Pinged fuel tank.

  3. Plunged fuel filter.

  4. Plunged nozzle.

Flash system
Clean

Clean


Replace

Replace


(ii)

Noise rap from one

Or more cylinder.



  1. Air in fuel system.

  2. Engine problem nozzle

Sticking open.

Check & correct

Replace deleting nozzle.



(iii)

Engine cranks but will not start

  1. In correct ordinary fuel.

  2. No fuel to F.L. pump.

  3. Plunged fuel system.

  4. Pump timing off.

Flash system

Check it


Check clean

Retime

(iv)


Rough idle no. abnormal noise or smoke

  1. Low idle incorrect injection line tank.

  2. Restricted fuels return line.

  3. Incorrect or dirty fuel.

Retime adjust a fix tank

Check return line clean



Flash system use correct data



Figure 18 DIFFERENT INJECTORS


EVALUATION TABLE:

Involvement/Performance

Calculation/Preparation

Viva Voce

Total

5

3

2

10















Date: Signature of faculty member

EXPERIMENT: - 6 DATE:-

AIM: Servicing & Testing Of Injector

Objective: After completion of this experiment student will be able to know.

DESCRIPTION:

Procedure:

  • The first step when a set of injectors arrives in the shop is each injector is removed from the box and is inspected for physical damage and/or missing parts.




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