Transmission pump blows every two months
Thread Starter
Driver School Candidate
Joined: Nov 2016
Posts: 31
Likes: 1
From: non us resident
Transmission pump blows every two months
Hello i had a transmission rebuilt at 333k km and it did blow transmission pump then i replaced whole transmission with 60k km one after two months transmission pump did blow again, i did send it back to warranty and he said that both trannies had same pump blow and it should be another problem he did check the torque converter and was all good so he said that maybe free space in crank or the pulley the torque get mounted to idk what the problem yet i would like any help thanks
What does your flex-plate look like, are there any anomalies? Is the flexplate warped or bent. Is the TC bolting on with no problem? Hows the fluid pressure, is it too high, too low?
Front pumps are pretty robust and live a long life if all is aligned well and they have clean fluid.
Were the coolant lines flushed? 333k km from the original is good. Likely not a block alignment issue. That said a bad flex plate or bum rebuild TC can kill a pump in no time.
I wish you luck.
Were the coolant lines flushed? 333k km from the original is good. Likely not a block alignment issue. That said a bad flex plate or bum rebuild TC can kill a pump in no time.
I wish you luck.
Thread Starter
Driver School Candidate
Joined: Nov 2016
Posts: 31
Likes: 1
From: non us resident
Thread Starter
Driver School Candidate
Joined: Nov 2016
Posts: 31
Likes: 1
From: non us resident
Front pumps are pretty robust and live a long life if all is aligned well and they have clean fluid.
Were the coolant lines flushed? 333k km from the original is good. Likely not a block alignment issue. That said a bad flex plate or bum rebuild TC can kill a pump in no time.
I wish you luck.
Were the coolant lines flushed? 333k km from the original is good. Likely not a block alignment issue. That said a bad flex plate or bum rebuild TC can kill a pump in no time.
I wish you luck.
Was it new or remanufactured torque converter?
If the engine side locator hub (fits into crank) is not concentric with the pumps drive flange, the torque converter (TC) could easily destroy the front pump.
The wear points upon inspection of pump and TC should tell the story. Because your flex plate is not rounded or damaged at the TC bolt down locations, the bolt torque likely did not play a roll in the pump damage.
Another factor on a trans rebuild are the builder and the installer.
If the builder did not check clearance and the pump was too tight OR assembly lube was not adequate, the pump will be damaged.
If the installer did not seat the TC properly and tightened the bell housing bolts (trans to engine), the pump can be damaged.
Also if during startup the fluid was not added fast enough the pump can cavitate and be damage.
The workmanship of rebuilt TC, the trans builder, and the installer are all suspect until root cause is determined.
What was the exact failure mode of the pump? This is what we need to know to prevent it from happening again. That said, was the pump a new OEM Part or rebuilt?
If the engine side locator hub (fits into crank) is not concentric with the pumps drive flange, the torque converter (TC) could easily destroy the front pump.
The wear points upon inspection of pump and TC should tell the story. Because your flex plate is not rounded or damaged at the TC bolt down locations, the bolt torque likely did not play a roll in the pump damage.
Another factor on a trans rebuild are the builder and the installer.
If the builder did not check clearance and the pump was too tight OR assembly lube was not adequate, the pump will be damaged.
If the installer did not seat the TC properly and tightened the bell housing bolts (trans to engine), the pump can be damaged.
Also if during startup the fluid was not added fast enough the pump can cavitate and be damage.
The workmanship of rebuilt TC, the trans builder, and the installer are all suspect until root cause is determined.
What was the exact failure mode of the pump? This is what we need to know to prevent it from happening again. That said, was the pump a new OEM Part or rebuilt?
Last edited by 2013FSport; Mar 8, 2018 at 12:09 PM.
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By the picture I can not see the locating dowels on the engine side. If one or both are lost during the install, both the pump and TC will be damaged. Another mistake the installer can make.
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Thread Starter
Driver School Candidate
Joined: Nov 2016
Posts: 31
Likes: 1
From: non us resident
Thanks very much for help, the transmission is imported from japan got new one with 40k miles on it and as i did see while removing the tranny it had TC bolts not torqued at all most of them were lose and removeable by hand, it took about two months to destroy the pump with very hard driving and drifting i used to pull the most out of the car about every two days till it did blow the flex plate is in good condition i think the problem is TC bolts because they were loose. i did use same TC with the tranny and had it checked right now in trannies shop
Thread Starter
Driver School Candidate
Joined: Nov 2016
Posts: 31
Likes: 1
From: non us resident
Was it new or remanufactured torque converter?
If the engine side locator hub (fits into crank) is not concentric with the pumps drive flange, the torque converter (TC) could easily destroy the front pump.
The wear points upon inspection of pump and TC should tell the story. Because your flex plate is not rounded or damaged at the TC bolt down locations, the bolt torque likely did not play a roll in the pump damage.
Another factor on a trans rebuild are the builder and the installer.
If the builder did not check clearance and the pump was too tight OR assembly lube was not adequate, the pump will be damaged.
If the installer did not seat the TC properly and tightened the bell housing bolts (trans to engine), the pump can be damaged.
Also if during startup the fluid was not added fast enough the pump can cavitate and be damage.
The workmanship of rebuilt TC, the trans builder, and the installer are all suspect until root cause is determined.
What was the exact failure mode of the pump? This is what we need to know to prevent it from happening again. That said, was the pump a new OEM Part or rebuilt?
If the engine side locator hub (fits into crank) is not concentric with the pumps drive flange, the torque converter (TC) could easily destroy the front pump.
The wear points upon inspection of pump and TC should tell the story. Because your flex plate is not rounded or damaged at the TC bolt down locations, the bolt torque likely did not play a roll in the pump damage.
Another factor on a trans rebuild are the builder and the installer.
If the builder did not check clearance and the pump was too tight OR assembly lube was not adequate, the pump will be damaged.
If the installer did not seat the TC properly and tightened the bell housing bolts (trans to engine), the pump can be damaged.
Also if during startup the fluid was not added fast enough the pump can cavitate and be damage.
The workmanship of rebuilt TC, the trans builder, and the installer are all suspect until root cause is determined.
What was the exact failure mode of the pump? This is what we need to know to prevent it from happening again. That said, was the pump a new OEM Part or rebuilt?
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