pump failures

[Hawaiian Turbo]

I would like to know , what causes a pump to fail? (Cracked rotor)

Thanks, Paul

 

[2quiktocare]

First thing I would ask is; how long has this pump been in service? 2: What happened just prior to you having ths problem?Mark

 

[gokada]

Your's cracked?

 

[Scottie-GNZ]

Just had mine replaced yesterday for the same problem. Symptom was fluid leaking out the vent tube at WOT. Still not sure wat caused it and that pump was not in the tranny long.

 

[Hawaiian Turbo]

The first pump was in a Jimmy's built trans, 10 vain, approx. 1500 miles with mid 11 sec passes. Had a crack on the rotor... (ticking sound) The second one was rebuilt stock with approx. 1000 miles, with about 8 mid to low 11 sec passes. This is the pump I used to rebuild the last trans by myself. This rotor was cracked into four pieces.

I was about 3/4 track and the engine reved just like it went into neutral. At the end of the track, I didn't have any gears, only Park

GOkada, Yep, I lost the trans Friday night on the last pass. 11.80 @ 104

I'll be calling you tomorrow Mark for a new pump body. I was just curious if it was something I did causing premature rotor failure.

Thanks, Paul

 

[2quiktocare]

Ok, now that we have the age and use thing clarified, What source did you use for the rotors? Sorry to be taking this in steps like this, but it's needed. Bare with me.......Mark

 

[Hawaiian Turbo]

I don't know the source of the rotors for the last two, Didn't get the build sheets or specs for the trans. But I'll know the source of the next. *L*

 

[2quiktocare]

Chances are they were imports made with powdered metal. They can not hold the stress of higher line pressures or the stress of normal GN operations. The failure of these parts are why we have gone to using the chrome moly units now exclusively. There is a very strong chance that is the main cause of failure. Not a rebuilding fault other than not using a high enough quality of part for the GN. Thanks, Mark

 

[Hawaiian Turbo]

Hey Mark, Just wondering if my pump got sent out. I ordered it on Thursday. Thanks, Paul

 

[quickt]

Rotor failures are more common than most know. I use a 4340 billet rotors in my trans that are equiped with a transbrake. With 4340 rotor you will never need to worry about breakage. Check the converter I have seen some of the TCS units that the snout is not 100% straight. Check the dowel pins to make sure that they are in the block. make sure that the converter enguages into the pump deep enough for full contact with the rotor. Any one of these items will kill a rotor in short order. Last but not least check the pressure. Hi pressure will also take the rotor out.

 

[Hawaiian Turbo]

THanks Lonnie, I'll be checking those things when I put the trans back in. TC is a PTS 9/11,have to check the snout, pins are there. It's probably the quality of the rotors as stated above. Hopefully by this weekend I'll get it in..... (Waiting patiently for a PTS package)

 

[Hawaiian Turbo]

Got the pump today, Looks good .Thanks Mark