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Old 06-23-2018, 07:12 AM
Baron515 Baron515 is online now
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Boat: 2008 X2
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2008 X2 engine replacement with PCM

I have recently acquired a 2008 X2 SS, it is a beautiful boat that needs quite a bit of work, mainly as it has no engine. I was able to get a PCM base engine to put into this boat as I know the local PCM dealer.

The only parts that came from the original Indmar MCX engine are
-Transmission and VDrive with bellhousing
-Fuel Rail and Fuel injectors
-The exhaust
-Engine wiring harness and ECM and Fuses

I had hoped that the base engine would be a straight forward installation and I would be able to reuse most of the indmar parts, bellhousing fits, so am using the transmission and vdrive already in the boat and exhaust headers.
My issue is now with the wiring, the wiring harness from the Indmar engine does not fit the PCM engine, and I dont know how compatible the ECM would be.

I see myself with 3 options,
1) Source different connectors and modify the Indmar wiring harness to fit the PCM engine, and hope that the ECM works well with engine.
2) Purchase a new PCM wiring harness and ECM, but am unclear if the boat wiring harness would connect up to the PCM harness? Below is a picture of the main boat harness connection. PCM has something that looks similar. Also would the gauges work? Perfect Pass? VDIG?
3) Use the original Indar wiring harness without any modification to the wiring but source Indmar sensors and parts and exchange them on the PCM engine.

Appreciate any advice and suggestions anyone here might have. Thank you!
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  #2  
Old 06-23-2018, 08:36 PM
88 PS190 88 PS190 is online now
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Any details on that pcm engine?
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  #3  
Old 06-24-2018, 03:01 AM
Baron515 Baron515 is online now
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Quote:
Originally Posted by 88 PS190 View Post
Any details on that pcm engine?
It is a PCM ex343
The base build includes intake, oil pan, valve covers, circ pump, distributor, and fuel rail with fuel injectors. I have purchased a new alternator, raw water pump and all pulleys and installed them.

The only connection that fits from the Indmar wiring harness is connection to the throttle body. Other than that and the fuel injector connections, im not sure which plug on the wiring harness should go where as I dont have anything to reference from Indmar.
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  #4  
Old 06-24-2018, 06:37 PM
Baron515 Baron515 is online now
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I just came across this Indmar service manual. Looks like it should be useful to identify the connections on the wiring harness.
Is there somewhere I can get a parts manual specifically for the Indmar mcx?

https://www.boattoys.ca/pages/indmar...gnostic-manual
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  #5  
Old 10-17-2018, 07:02 AM
Baron515 Baron515 is online now
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Update

New motor is now in the boat. And bits and pieces are going together.
I faced a few issues with the mounting holes being stripped and had to tap them a size bigger.
I was very wrong about my concerns with the wiring, the old wiring harness fit the new motor fine, fuel injector connectors are different, I bought these adapters to fix that.
https://www.amazon.com/Michigan-Moto...4&keywords=ev6

The other issue is the map sensor and wiring is different. On the new motor is a TMAP sensor which has a 4th pin for measuring temperature, I have ordered a new connector for that too, and will be ignoring the pin for temperature. Other than that both MAP sensors are 1Bar so it works the same way for the ECM.

The whole intake on the new motor is different, as I am running in saltwater the old MCX motor was a fully closed system, the bracket that holds the heat exchanger bolts on to the thermostat housing on the intake, with the new motor, this bracket sits a lot higher and the heat exchanger does not fit, this is something I have yet to figure out, but I will find a way to mount the heat exchanger.

My plan is to not run coolant through the exhaust manifolds, so salt water will run through heat exchanger and then through the manifolds and out the exhaust elbows. It makes plumbing much simpler and it should run much cooler. I am used to flushing after every use so I dont think it should be a problem.

Once I fix the wiring, and heat exchanger issue, it should be ready to start up, main concerns will be how it runs if at all with an ECM from a different motor.
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  #6  
Old 10-17-2018, 11:06 AM
Ironhorse Ironhorse is offline
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Lets see some pics! It sounds like a hell of a project.
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  #7  
Old 10-17-2018, 11:35 AM
Baron515 Baron515 is online now
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These may not be what you are expecting. But this is as of today. I decided to pull out the fuel pump assembly to inspect the tank, did i mention this boat has been sitting for the last 6 years?

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  #8  
Old 10-19-2018, 09:43 AM
Baron515 Baron515 is online now
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This is my replacement fuel pump, it should be more reliable, and it cost me less than what I could find a new mastercraft assembly for. I will modify the existing top plate to add a pickup line and return line, and ofcourse clean the tank. Also with this I can run the boat with a temporary fuel tank to hopefully get on the water and with some nuts and bolts in the fuel tank it will help clean it up.

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  #9  
Old 10-19-2018, 09:53 AM
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Mastercraftdave Mastercraftdave is offline
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Great project. I will be following this.

What the outside of the boat look like.
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  #10  
Old 10-19-2018, 10:31 AM
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wheeler wheeler is offline
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Boat: 2007 X2
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I would like to know some more info on that fuel pump setup you have there, is it home made or can it be purchased?.....also, keep us updated on the tank plate with pick-up and return lines. This is something I have wanted to do to eliminate the continuous failing in-tank pump. I keep an entire pump unit in the boat as a spare.

I am sure there are others out there who would love to get rid of the in-tank "masterpiece"
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