Posts: 38
Threads: 7
Joined: Mar 2018
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Home Port: Lake Michigan
Vessel Info: 2004 35 Open 8.2L
I have a 2004 35 Open with 8.1 Crusaders and ZF Transmissions. I do have trolling valves installed. The starboard trans has always whined at idle in forward only. Above 900 rpm or so the whine disappears. I talked to ZF Marine and they said this is normal as that tran spins in reverse due to counter rotating engines. It seems to be getting louder and I have seen some threads to replace tran oil with 15W-40 engine oil. Anyone have similar issue or suggestions?
Posts: 24
Threads: 3
Joined: Jun 2017
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Home Port: south haven
Vessel Info: 2006 3200 open 8.1 crusaders
I have same engine and trans but had the clatter at idle so I drained and filled with 15-40 which got rid of all the clatter but I believe might have slowed my top end speed by several mph. Replacing with 15-40 is common with the ski boat crowd but only certain transmissions and I have not seen where zf has approved a zf63a for the switch assuming that is what you have. I plan on trying 5w20 next as that's about as close to atf as engine oil gets.
Posts: 17
Threads: 4
Joined: Nov 2017
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Home Port: long island
Vessel Info: 1998 3500 Open , 7.4 XLI
Interesting because I have the same whine but only noticeable after a good run. 45 mins or so. Coming off plane and you start to hear it when you drop below 1K RPM.
