Flush and Fill ?

[vwalburn]

What is the best way for me to do a complete flush and fill on the auto transmission on an 2002 Honda Accord and will I need 2.7 Qts. or 6.5 Qts.?; initial fill or total fill?
Thanks for the help,

Vinnie

 

[The Critic]

You'll need 50% more than the unit's capacity of 6.5 quarts to perform a flush and fill. You will need a 10 quarts to do a good flush.

Be sure to drain the unit using the drain plug before starting the flush. The drain plug is magnetic and should be cleaned.

Use Amsoil ATF. It's better than Honda ATF-Z1.

 

[Big Jim]

You need to total fill quantity and possibly plus a little. Unless the current fluid is in really bad condition, I doubt that you need 50% more.

If you are doing the hose in a bucket flush from the trans cooler lines, you flush until the fluid coming out is as pristine as the fluid going in. Usually that is at the maximum capacity or a quart more.

 

[The Critic]

Originally Posted By: Big Jim
You need to total fill quantity and possibly plus a little. Unless the current fluid is in really bad condition, I doubt that you need 50% more.

If you are doing the hose in a bucket flush from the trans cooler lines, you flush until the fluid coming out is as pristine as the fluid going in. Usually that is at the maximum capacity or a quart more.


Really? I was told that because the fluid mixes during the exchange process, you need a lot more than the unit's capacity for a complete fluid exchange.

Clore Automotive, makers of the T-Tech, state on their website that 20% over the unit's capacity is recommended. Some technicians have told me that twice the unit's capacity is needed if you really want a full flush.

Although this wasn't recommended for transmissions, GM recommends exchanging 50% more than the system's capacity in regards to coolant exchanges if you use a coolant exchange machine.

 

[ZZman]

There should be very little mixing if you use a cooler line to do the flush and drain the pan first and do a refill to start the process. I would think a couple Qts over the AT capacity would be enough.

I actually got this from the T-Tech website owner manual:

6. When the desired amount (vehicle system capacity) of ATF has been exchanged, or the fluid in the service
hose coming from the vehicle runs clear, turn the vehicle OFF, remove all hoses and hose connections and
reconnect the vehicle transmission cooling lines.

 

[ZZman]

Originally Posted By: vwalburn
What is the best way for me to do a complete flush and fill on the auto transmission on an 2002 Honda Accord and will I need 2.7 Qts. or 6.5 Qts.?; initial fill or total fill?
Thanks for the help, Vinnie


The best way? Take it to the dealer and let them deal with it!......

 

[doitmyself]

Originally Posted By: ZZman
The best way? Take it to the dealer and let them deal with it!......

But......not the one in Okemos!

 

[The Critic]

Originally Posted By: ZZman
There should be very little mixing if you use a cooler line to do the flush and drain the pan first and do a refill to start the process. I would think a couple Qts over the AT capacity would be enough.

I actually got this from the T-Tech website owner manual:

6. When the desired amount (vehicle system capacity) of ATF has been exchanged, or the fluid in the service
hose coming from the vehicle runs clear, turn the vehicle OFF, remove all hoses and hose connections and
reconnect the vehicle transmission cooling lines.



http://www.cloreautomotive.com/techdocs/TT500_web.mov

This video mentions the 20% over unit's capacity recommendation.

Also, the 98-02 Accord transmissions are very prone to failure, just FYI.

 

[Big Jim]

Originally Posted By: The Critic
Originally Posted By: Big Jim
You need to total fill quantity and possibly plus a little. Unless the current fluid is in really bad condition, I doubt that you need 50% more.

If you are doing the hose in a bucket flush from the trans cooler lines, you flush until the fluid coming out is as pristine as the fluid going in. Usually that is at the maximum capacity or a quart more.


Really? I was told that because the fluid mixes during the exchange process, you need a lot more than the unit's capacity for a complete fluid exchange.

Clore Automotive, makers of the T-Tech, state on their website that 20% over the unit's capacity is recommended. Some technicians have told me that twice the unit's capacity is needed if you really want a full flush.

Although this wasn't recommended for transmissions, GM recommends exchanging 50% more than the system's capacity in regards to coolant exchanges if you use a coolant exchange machine.


That has not been my experience.

I'm sure that some flush machines are not as efficient as others. Some (most) flush machines in service shops (dealerships included) belong to one of the snake oil companies who make their money from the use of their chemicals and fluids so they would like you to use as much as possible.

 

[Donald]

The problem is when shops do a flush few if any do a drain and fill of the pan. Thus there will be mixing of old/new ATF in the pan for awhile. They just hook up the flush machine push the start button and work on another car for 20 minutes until its done.

Given that mechanics charge $50-$75/hour its probably more efficient to push through a few extra quarts of ATF rather than drain and refill the pan especially is there is no drain plug.

There are two caveats to this, 1) when using expensive ATF like M1 or Amsoil or 2) when the filter should be changed as the old ATF looks like driver sealer.