Front Pump Seal e40d

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Jul 7, 2010 | 06:30 PM

jdr37

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Front Pump Seal e40d

As posted earlier I've had a problem with the front seal leaking at high temperature (F53 motorhome, 460, e40d). Had the tranny pulled and the pump resealed -- the tech words were "the rest of the tranny is CHERRY". I'm a happy camper. Looking for opinions -- at what temp would the new seal be likely to leak: 250, 275, 300, 300 plus.
I know this is ONLY a guess but I'm installing a temp gauge and thinking about an electric fan over the tranny add on cooler, but not sure I need it.

OPINIONS please,
Thanks, jdr37

Jul 7, 2010 | 07:42 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

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From: SE Florida

The trans temp you see on a gauge is not the temp that the seal will leak. The local heat where that seal is located can be A LOT hotter than the bulk trans temp. It isn't practical to get a sender in that location, either.

Jul 8, 2010 | 06:35 AM

jdr37

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Let me try to clarify my question. What I am trying to determine is whether or not I need to install an electric cooling fan to assist the cooling of tranny fluid. The unit has one factory installed add-on and one add-on by the motor home manufactuor. Since the front seals were known to be weak in this tranny (1995 e40d) and I did not have a tranny temp gauge I do not know at what temp the seal would leak. I am installing a temp gauge with the sender located at the outlet port of the tranny going to the coolers. If this tranny doesn't ever get past 250 to 275 degrees (worst case scenario) should I worry about the new seal holding up?
If the tranny runs over 180 to 190 on the highway or exceeds 235 in slow stop and go traffic I will install a fan -- what are the experiences with this older model e40d with updated seals??