Tranny right yet?

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   Some of you might recall my previous tranny woes. I just got the new engine back in with a freshly rebuilt tranny behind it. The combo is much stronger than before, and I attribute a significant part of that to a non-slipping tranny. However, the tranny is again heating up a lot. I don't think as much as before though, but still very hot to the touch.

This despite the fact that I also installed not only a new heat exchanger, but also one that is 12 inches long.

I also got a trick new infrared surface temp sensor that told me the surface of the tranny was right at 170 degrees after running a while. Anybody know if this is too high? Is that just a sign of hard work, or do I still have a defective tranny that's going to give up (again) after a couple days' labor?

Finally, since I put in a larger exchanger, should I put in more tranny fluid? It's right on the dipstick, but the dipstick assumes a certain amount of hose capacity, of which I have more now.

Thomas

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tleed Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-24-2004 Location: United States Status: Offline Points: 267	Post Options Post Reply Quote tleed Report Post Thanks(0) Quote Reply Topic: Tranny right yet? Posted: August-05-2006 at 11:59pm
	Some of you might recall my previous tranny woes. I just got the new engine back in with a freshly rebuilt tranny behind it. The combo is much stronger than before, and I attribute a significant part of that to a non-slipping tranny. However, the tranny is again heating up a lot. I don't think as much as before though, but still very hot to the touch. This despite the fact that I also installed not only a new heat exchanger, but also one that is 12 inches long. I also got a trick new infrared surface temp sensor that told me the surface of the tranny was right at 170 degrees after running a while. Anybody know if this is too high? Is that just a sign of hard work, or do I still have a defective tranny that's going to give up (again) after a couple days' labor? Finally, since I put in a larger exchanger, should I put in more tranny fluid? It's right on the dipstick, but the dipstick assumes a certain amount of hose capacity, of which I have more now. Thomas

rmcdonald Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: December-30-2005 Location: Australia Status: Offline Points: 71	Post Options Post Reply Quote rmcdonald Report Post Thanks(0) Quote Reply Posted: August-06-2006 at 8:24am
	Hi Thomas Below is a extract from the Chrysler Marine Manual page 63. The last line answers you question on Operating tempreture for the gearbox. Pressure Regulation A relief valve maintains the oil at a constant pressure at approximately 120 to 140 psi at engine speeds over 1000 rpm. Pressures slightly above or below these values may be encountered. The pressure will be as low as 70 psi at 500 to 650 rpm idle speed according to the Model Marine engine. Due to variances in the relief valves the specified oil pressures are attained at normal operating ranging from 180 to 190 degrees F. Regards Rob

tleed Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-24-2004 Location: United States Status: Offline Points: 267	Post Options Post Reply Quote tleed Report Post Thanks(0) Quote Reply Posted: August-06-2006 at 2:19pm
	Woohoo! Maybe I can quit obsessing that the tranny is about to give up again. It did perform flawlessly yesterday. Heading out again today momentarily. Thomas

64 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-08-2004 Location: United States Status: Offline Points: 415	Post Options Post Reply Quote 64 Skier Report Post Thanks(0) Quote Reply Posted: August-07-2006 at 2:44am
	Great Job rmcdonald.
	64 Skier 66" HO VTX and 67" HO Triumph 71CC

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: August-07-2006 at 4:22pm
	Tranny fluid must be check immediately after shutting of the engine. This is so that the oil does not have time to run out of the hoses/passages/pump and give a false reading. Thus, longer hoses or a larger heat exchanger have no effect on the fluid markings on the dip stick. The fluid level should be check with the tranny at operating temperature.

tleed Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-24-2004 Location: United States Status: Offline Points: 267	Post Options Post Reply Quote tleed Report Post Thanks(0) Quote Reply Posted: August-07-2006 at 10:03pm
	Hmmm. I've always checked when it's cool. Have to check next time after I get it hot. My temp readings were the surface of the tranny. Sunday when I had it out, the surface temp did get up to 189 degrees. Thomas

eric lavine Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413	Post Options Post Reply Quote eric lavine Report Post Thanks(0) Quote Reply Posted: August-13-2006 at 10:16am
	Thomas, what trans model do you have? we recently ran into this problem with a zf 450, the problem ended up being a worn pump, the boat only had 150 hours on it. what exactly happens with a worn pump is that all the extra fluid that is not used goes to the cooling circuit to cool the trans,if the pump is worn it cavitates within itself and only sends a trickle to the cooler. the pump was 12 weeks out of italy so i ended up replacing with a good old reliable borg warner. eric 877-369-6693
	"the things you own will start to own you"

tleed Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: August-24-2004 Location: United States Status: Offline Points: 267	Post Options Post Reply Quote tleed Report Post Thanks(0) Quote Reply Posted: August-14-2006 at 4:13pm
	Borg Warner 71C

rmcdonald Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: December-30-2005 Location: Australia Status: Offline Points: 71	Post Options Post Reply Quote rmcdonald Report Post Thanks(0) Quote Reply Posted: August-14-2006 at 10:36pm
	Hey Thomas Have you had her back in the water since the rudder stress crack problem. Regards Rob
	68 Ski Nautique

Tranny right yet?

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