RE4R01A - plastic ring in the pan

[fin_reaper]

I know it's not good to have anything in your pan, but can anyone identify this plastic ring that was broke in half? I will be planning a rebuild shortly.

 

[Cuong Nguyen]

It does look familiar but I'm going off a vague memory from years ago when I first pulled the valve bodies apart. If I get some free time this today or this weekend I'll drop the pan and take a look for you. I'm still in the middle of disassembling the transmission.

[Cuong Nguyen]

Pulled the pan and found the same thing. It broke in 3 pieces. I just got to figure out where it came from for both our sakes. What kind of issues were you having?

 

Sent from my SAMSUNG-SM-N920A using Tapatalk

Edited March 19, 2016 by Cuong Nguyen

[Cuong Nguyen]

Looking at the FSM, I'm guessing it might be the thrust washer that sits on the rear shaft of the oil pump. Again, I am just guessing until I tear it down and figure out where else it could come from.

[fin_reaper]

Thanks for checking - it does look like a thrust washer of some sort. I was missing 2nd and OD, so that prompted me to pull the pan. My solenoid self check passed, but i wanted to see if I could spot something obvious before pulling the tranny.

[Cuong Nguyen]

 

I found the main piece stuck to the pan and the other two stuck on the valve body. don't mind my burned and broken brake band friction material.

[fin_reaper]

I did an engine swap, after the beast sat for 2+ years (timing belt...). Before the swap, the tranny was slow to engage in drive when cold, then thunk, it went. After the engine swap, no more hesitation when cold, but I only had 1st and 3rd gears. I was hoping it was the solenoid pack, since I found some at a local pick and pull, but it looks like it may be deeper. Any chance this ring, or whatever caused it to break, could be related to my lack of 2nd and OD?

 

On more tidbit - when I pulled the tranny computer, and drove while I forgot it wasn't connected, the tranny started in second. I stopped and reconnected the computer and back to 1st and 3rd.

[Cuong Nguyen]

When I had a semi running motor, the transmission would kick down and up bucking but that could a whole slew of things which I had no time diagnosing at the time.

 

As for the broken bits, I highly doubt that could be the issue as the oil filter would prevent the pieces from being pumped into the internals.

 

When you did the engine swap, did you have issues lining up the torque converter and inputshaft on the oil pump?

 

I have not gone through the whole troubleshoot of the transmission yet, but when I do I'll let you know what I come up with. I'm still learning the intricacies of automatic transmissions.

Edited March 20, 2016 by Cuong Nguyen

[fin_reaper]

No issues lining up the tc. Went in pretty smooth.

[Cuong Nguyen]

try swapping out another TCU and see if that fixes it.

with the TCU disconnected, I think the transmission goes into "limp mode" which is that it starts in 2nd. I could be wrong about this so don't take my word for it.

[Cuong Nguyen]

I have verified that is the thrust washer on the rear of the oil pump after taking apart the Xterra transmission. Did you ever figure it out yet?