Wednesday, April 24, 2013

Care for the W124 Ignition Control Unit



As the years go by for the W124, it has still yet to be dreary to drive one..

However, as the numbers on the road dwindle, it may no longer be economical to continue to produce spare parts for this particular make.

One of the critical components that may be affected by production is the Ignition Control Module.
For the KE-Jetronics/CIS-E managed engines such as the M102, this is a critical component and though it hardly fails, if it does, the engine will stall and it will not be able to crank up again until the faulty Ignition Control Module [ or Trigger Board as it is fondly called in Singapore/Malaysia ] is replaced.

Ignition Control Module aka Trigger Board/Box




As seen in one of the official maintenance manuals, it is indicated that the Trigger Board requires proper heat dissipation.



With several of the trigger boards that I have personally removed and seen, it was observed that most of the heat sink paste had hardened under the trigger board and does not provide full surface contact to the chassis which it is attached onto.

I can only assume that with such specific instructions of the maintenance manual, the only cause that could damage the unit will be heat.

So to prolong the lifespan of the trigger boards, it is highly recommended to refresh the mounting by scraping off the hardened heatsink paste on both the trigger board and chassis and use a fresh tube of heat sink paste which is cheaply available from electronics/hardware/DIY store.

Good for temperatures up to 300 deg C

If possible, do buy a (few) spare trigger board(s), to protect against EOL of the production. But do ensure that the heat sink is properly applied before installation of the new one.


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