Tranny right yet?
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=4380
Printed Date: November-27-2024 at 10:42am
Topic: Tranny right yet?
Posted By: tleed
Subject: Tranny right yet?
Date 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
|
Replies:
Posted By: rmcdonald
Date 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
|
Posted By: tleed
Date 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
|
Posted By: 64 Skier
Date Posted: August-07-2006 at 2:44am
Great Job rmcdonald.
-------------
64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
|
Posted By: David F
Date 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.
-------------
|
Posted By: tleed
Date 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
|
Posted By: eric lavine
Date 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"
|
Posted By: tleed
Date Posted: August-14-2006 at 4:13pm
Posted By: rmcdonald
Date 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
-------------
http://www.correctcraftfan.com/diaries/details.asp?ID=1177 -
|
|