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Old 18-04-2012, 14:36   #1
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CHECK ZF GEAR RATIO

I don't know what my gear ratio is Shop says prop is wrong for the boat. Suggest new prop but need info.

Prop was fitted by previous owner, I don't doubt it is not correct.

Yanmar 4JH4-TE
Hurth ZF-30

Hurth makes a 2.15F/2.64R and a 2.70F/2.64R version. Don't know what I have.

Called a dealer and they said to spin the transmission and count revolutions.

Any better ideas?
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Old 18-04-2012, 14:39   #2
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Re: CHECK ZF GEAR RATIO

Look at the plate?
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Old 18-04-2012, 14:46   #3
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Re: CHECK ZF GEAR RATIO

get a photo tach, and read input speed vs output speed........ probably cheaper to do what the dealer said though, just need to pull the trans off of the engine.
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Old 18-04-2012, 19:13   #4
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Re: CHECK ZF GEAR RATIO

Mech and I both looked at the plate and neither one of us could see an appropriate marking.

Maybe a quick trip to Harbor Freight is in order.

But then I need the boat in the water!

Would be nice if it had a decompression lever, which it does not.
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