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Thread: crank question

  1. #1
    StevoH@O's Avatar
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    crank question

    Is it allowable to put a DI crankshaft into a Carb crankcase? I have an )#crank that want bad. I bought a lower unit that I was assured "they are all the same". Well DI have oil lines and carb has a pulse hookup. Please let me know if the DI crank will cause issues with my "03 carbed unit.

    Thanks


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    Click avatar for tech links/info, donation request K447's Avatar
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    Which exact engine model do you have and which exact engine model did the crankshaft come from?

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    If its a 1200 motor the cranks are thee same. The msx crank has a snap ring on one of the inner bearings that would have to be removed to put in a regular 1200 case.

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    Resident electronics hacker UnityRacing's Avatar
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    Aside from the snap ring, are the MSX cases also the same? Any benefit to using one of them over a different 1200 case?

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    MSX cases are different. They have the groove for the snap ring. The machining opening that the cylinder drops down into is bigger. They have no pulse fittings. They also have the 4th oil injection port near the MAG bearing. MSX cases are a lot more rare and much more expensive used than standard 1200 cases.

    You can use standard 1200 cases with MSX cylinders, but the cases would have to be machined to accept the larger MSX cylinders.

  6. #6
    Resident electronics hacker UnityRacing's Avatar
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    Could you go the other way also, and use the MSX case with standard 1200 cylinders ?

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    Quote Originally Posted by UnityRacing View Post
    Could you go the other way also, and use the MSX case with standard 1200 cylinders ?

    I don't know of anyone that has done that. With the expense of the MSX cases, I see no reason to do it.

  8. #8
    StevoH@O's Avatar
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    Sorry, Let me add more information. I have a carb 2003 2 cylinder unit. A crank bearing went on it. That caused some scraping of the crank against the inner sides of the crank case. And some wear in the one end of the crank case. So the crankshaft is bad (broke the rod off) and the crankcase is compromised.

    So I had this post out a few months and a forum participant said he had a 700CC lower end, which I bought and he shipped. Great. Until I noted that his case had no pulse fitting and 2 oil lines. I figured the lower case to be for a Direct Injection engine with no pulse line. His crank seems to have tight bearings. But is it exactly like the original that threw the rod?

    My original case has a date code of: 11/12/02 and a part number of 0001704

    The replacement case (without the pulse hose hook-up) has a date code of: 02/22/02 and a part number of: 0001038

    Thanks everyone for trying to answer.

    Steve

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    I'm curious, does someone know if you could drill and tap the case and install a couple of barbed fittings
    for the pulse lines?

  10. #10
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    Quote Originally Posted by scorp View Post
    I'm curious, does someone know if you could drill and tap the case and install a couple of barbed fittings
    for the pulse lines?
    Yes you can.

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