Product Description
THE ISSUE WITH PUMP GEARS & WEAR PLATES:
Since
the inception of the 5R110 transmission, many shops have seen their
share of welded pump gears to wear plates. There have been numerous
tech articles related to this phenomenon claiming bad grounds as the
most likely culprit. While bad grounds are definitely a good thing to
fix for properly functioning electronics in the transmission controls,
its almost laughable that a 20 gauge wire carries enough amp load to
weld steel.
In a vast majority of these instances, it was a complete loss of the transmission, torque convertor, and all internals. If you cannot get the converter out of the pump, you cannot tear the transmission down to rebuild.
What is happening is
a thing called friction welding. Friction welding happens when two
similar metals are spun at different speeds against each other causing
enough friction to heat the metals up to near melting point. At this
point the two metals fuse together.
What we found was in the process of rebuilding a unit, shops would
replace a gear set and not understand this tolerance limit and this weld
would happen shortly afterwards. In the event of an OE unit failing, we
believed it was simply transmission metal debris getting in-between
these two surfaces reducing this gap causing the same friction event.
THE DIESELSITE SOLUTION:
First, we understand that a transmission builder needs a
.002"-.004" gap between the surface of the gear and the top of the pump
gear pocket surface.
Secondly, we use a
material that acts like a bushing so that debris can pass, welding can
never occur, and friction is greatly decreased.
The
DIESELSITE wear plate is similar in design and material to what many
gear rotor style pump manufacturers use for the wear plate. It is a
specialty bronze material designed for this type of application.
Keep in mind that our plate will not prevent all failures,
especially if the pump gear to surface gap is not correct, but it will
prevent pump gear welding, so that the unit can be removed and rebuilt
as normal.
You will need to identify the casting number on your transmission pump cover.
3C was OE from 2003-2004
5C was OE from 2005-2008
9C was OE from 2009-2010
The 3C plate is not compatible on 5C and 9C pump castings. These numbers are here for reference only, DO NOT ASSUME your model and please verify by physically checking the pump casting number prior to purchase.
Special note to knowledgeable builders: As you know, in all the variations of the pumps used on the 5R110, Ford updated the wear plate lube and passageway circuits. We made sure to use the very latest circuit pathway variation in our plates. So, this makes this an upgrade in the OE plate in most versions, even aside from the friction welding issue.
The 9C pump casting was only an internal change to the TC lube circuit. It has no effect on the plate application. Is is the same plate as the 5C.