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Pelican Technical Article:

Ignition Coil Replacement

Time:

15 minutes15 mins

Tab:

$1 to $300

Talent:

*

Tools:

6mm and 8mm socket wrench with 6-inch extension, Phillips head screwdriver

Applicable Models:

Mercedes-Benz R107 (1973-80)

Parts Required:

Ignition coil

Hot Tip:

Inspect leads for corrosion

Performance Gain:

Improved ignition

Complementary Modification:

Replace spark plug wires

The ignition coil is also referred to as a spark coil. The ignition coil transforms the low voltage from the battery to the thousands of volts needed by the spark plugs to establish ignition. The wire that goes from the ignition coil to the distributor and the high voltage wires that go from the distributor to each of the spark plugs are the spark plug wires. The ignition coil can short out over time resulting in limited or no charge being sent to the spark plugs.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. Protect your eyes, hands and body from dust, debris as well as sharp objects and edges while working on your vehicle. Disconnect the battery before beginning work. Never work on your vehicle if you feel the task is beyond your ability.

Remove the rubber cover and inspect for any corrosion on the leads.
Figure 1

Remove the rubber cover and inspect for any corrosion on the leads.

Remove the main spark plug wire from the ignition coil.
Figure 2

Remove the main spark plug wire from the ignition coil. 

Using a 6mm socket wrench and a 6-inch extension, loosen and remove the nuts which hold the leads from the battery and ground in place.
Figure 3

Using a 6mm socket wrench and a 6-inch extension, loosen and remove the nuts which hold the leads from the battery and ground in place.

Using a 8mm socket wrench and a 6-inch extension, loosen and remove the bolt holding the ignition coil in place.
Figure 4

Using a 8mm socket wrench and a 6-inch extension, loosen and remove the bolt holding the ignition coil in place.   

Using a Phillips head screwdriver, loosen the screw which is holding the ignition coil bracket.
Figure 5

Using a Phillips head screwdriver, loosen the screw which is holding the ignition coil bracket. Removal of this screw is not necessary. 

Lift the ignition coil out of the bracket.
Figure 6

Lift the ignition coil out of the bracket. Replacement is the reversal of removal.




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Comments and Suggestions:
ace one Comments: 1977 mercedes benz 4 50SL how do you check the transmitter wire? This is the wire from the distributor to the ignition control unit.
September 6, 2017
  Followup from the Pelican Staff: What wire? Can you share a wiring diagram for the vehicle? I can comment once I look it over. - Nick at Pelican Parts  

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Page last updated: Thu 11/23/2017 03:07:36 AM