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  1. #1

    Join Date
    Sep 2006

    1100 rear crank seal replacement ?


    I have a 1997 Yamaha Exciter jet boat with twin 1100 motors (I think they are the same as the waveraider motor). The left motor blew out the rear crank seal so I am going to pull the motor in the morning. I'm hoping that all I will have to do is replace the seal since the compression is good (115-116-114) and it ran great up until the seal problem but I will never know until I get in there.

    I was wondering what is required to replace the rear crank seal? If it can be done w/o disassembling the motor then I am more than capable of doing that, but if it requires tearing down the whole motor then I will have someone who does this on a regular basis replace the seal.

    I am curious as to what would cause the seal to come out? Whether I just replace the seal or rebuild the whole motor since it will already be out, I want to try to make sure that this does not happen again.

    Also, is it best to order replacement engine parts from yamaha, or is there a better place/supplier to buy parts.


  2. #2
    it is the same as the waveraider! and you have to pull the pto and flywheel and split the case clean the mating surfaces apply sealant and reassemble and torque to specs ( sequence and torque specs are cast into case) ps pay attention to the orientation of the seals when u pull them ! there isn't any good pics to show you the proper way And replace all 3 seals OEM are best

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