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+--- Thread: Differences in Port and Starboard ZF Transmission pressures and temperatures (/showthread.php?tid=8679)
Differences in Port and Starboard ZF Transmission pressures and temperatures - rmsullivan1@gmail.com - 07-10-2023
my 2006 3600 Open has twin Cummins 5.9 QSB's with ZF 220 A transmissions. The transmissions are identical (same model and SN for some reason) so one runs in reverse when underway. I have noticed that one transmission has slightly higher running oil pressure and slightly lower oil temperature ~ 15 psi, can't recall the temp difference. Are these differences expected given that one unit is running in reverse?
RE: Differences in Port and Starboard ZF Transmission pressures and temperatures - MC1600 - 07-11-2023
I have the same setup except with CATs. It’s always been that way and the surveyors saw no issues three years ago when we bought the boat, so I’ll be curious as to responses here too.
RE: Differences in Port and Starboard ZF Transmission pressures and temperatures - Sapphire - 07-12-2023
I've always used a 5% variance between engines/transmissions as normal variation. Seems like you are are in that range. No worries.
RE: Differences in Port and Starboard ZF Transmission pressures and temperatures - rmsullivan1@gmail.com - 12-19-2024
My apologies for not following up on my post/question. It turns out that the problem became much more pronounced on the port side. In the process of switching sensor side to side, I found that on the port cable harness there was a connection that, although it has a rubber seal, had some water intrusion and this was shorting out the connection and giving erroneous readings. I’m back to have a slight difference in pressure, temperature and fuel consumption (0.3 gallons per hour at speed) which I’m told is typical when twins when one tranny is running in the opposite direction as the other.