part compatibility question

[Sugarloaf79]

I need to replace the crankcase assembly on my Yamaha F100 (1999).

The original part (67F-W009B-00-1S) is no longer available, nor is the updated part (67F-W009B-28-9S) in many places, including Boats.net.

I can get part number 67F-W009B-06-8P, new old stock, which the seller believes might work on a Yamaha F100 (it was originally built as a Mercury part for 75/90hp, OT178499).

Would this part be compatible. I'm hoping those more familiar with Yamaha's numbering system might chime in and give me some advice. My understanding is the important numbers are the first two sets (67F-W009B), but I could be way off base.

Thanks for any help you all can give (and apologies if a similar question is answered elsewhere).

[boscoe99]

What sort of a deal can you get for the 67F-W009B-06-8P crank case assembly that is used in the Mercury F100 equivalent? If a smoking good deal then it might be worth taking a chance on. I can't think of a soul outside of the Yamaha engineering department in Japan that could tell you if this part can be used as a replacement for the part that is on your motor.

NADA says that your motor has a low retail value of $2970.00. I doubt it is worth this much if it is in need of a new short block. A 67F-W009B-13-9S short block is available from Yamaha but the price exceeds the present value of your motor. Are you willing to spend 4 grand or more to repair a motor with a value less than $2900?

67F-W009B-13-9S CYLINDER BLOCK ASSY

Where did you get part number 67F-W009B-28-9S from?

[Sugarloaf79]

Thanks for the reply.

I can get the new short block, including all new gaskets needed for installation, and a few other included parts, for $1700.

I got the 67F-W009B-28-9S part number from Boats.net's service department, and confirmed with another parts site.

[boscoe99]

What exactly is wrong with your block?

If it is repairable, then for $1700 I would take a chance with the Mercury/Yamaha motor. You could always rebuild your block using stuff from the Merc/Yam block if it came to that.

[Sugarloaf79]

Threw the rod (or worse) in cylinder #2, put a hole in the front and size of the crankcase. I could try to rebuild with the remaining pieces, but I think the right choice is a new block or entire motor.

[boscoe99]

Agreed. New block needed.

[rodbolt17]

just remember.
a ventilated block is typically a symptom of a problem, not THE problem.