Engine Control Unit and casting number

[jstavrakas]

My boat has been laid up for a few weeks and after trouble shooting a few other problems, the engine control unit on my starboard engine was found to be shot (wiring harness was chaffed and shorting - this may have damage the ECU?).

I am running twin 2001 200 HP HPDIs Z200TXRZ engines. The ECU is backordered from Yamaha until mid-August. I found a used ECU that matched the part number exactly 68F-8591A-20-00 and am having it next day shipped to the shop.

Prior to locating the used ECU, in speaking with another supplier he wanted the engine casting number before looking for a used unit. Since I am out of town and did not have it I continued looking for a used ECU that matched the part number.

Why would I need the casting number if I matched the part number exactly?

[Sequoiha]

You wouldnt,, if the part number matches you will be ok..

[jstavrakas]

Unit seems to be working fine. I am back in the water. Now the weather is blown out for the weekend.

[jstavrakas]

Poppet valve cover blew apart

The poppet valve cover blew apart, shorting the wiring harness and frying the engine control unit.

I am surprised at how bad the valve cover was and wonder what other corrosion is happening on the engine.

[Sequoiha]

Ive seen that several times.. wouldnt hurt to spray the engine with some fluid film...