r154 question

[dirtyJZ]

Hey i no very little about this but have heard that the r154 thrust gear washers fail quite often.
Is this the case? what causes them to fail? How can you prevent this from happening. Is there heavy duty options out there our ways to stop this.

As i have just brought a r154, and want to prevent this before i install in replacment of my w58. What happens when this washer breaks, does it do damage to the gearbox, or just make it not go into gear. There is always the good old saying dont fix it if it is not broken. It is behind a 1JZ-GTE

Any opinions welcomed

 

[Poodles]

Usually fails from a high torque, high shock load situation (i.e. dragracing).

You'll probably be fine. There is still a lot of speculation as to how to prevent it, but I have not heard of a single failure of a Marlin Crawler rebuilt R154 which includes their heavy duty front bearing plate.

The thrust washers won't fail from the pressure, but from the impact. If the clearances are tight like they're supposed to be (and stay that way without flexing) it SHOULDN'T fail as there isn't enough room to shock it and shatter it.

That's my honest opinion, so I could be wrong, but Marlin Crawler knows his Toyota transmissions...

 

[SupraClaou]

The R154 is a heavy duty transmission by itself....
It can hold up to 600-700 whp no problem
But the 1st gear's thrust washer can fail when you launch from
a dig or rolling (1st gear) on a high horsepowered mk3.

'Poodles' provides good infos and Marlin Crawler is one of the best!

 

[dirtyJZ]

Thank you that is what I wanted to find out, but what happens when it breaks if it does break does it do any internal damage to the gearbox or just break and you have to replace the washer it self. Imp pretty sure the gearbox tolerances will not be tight as it has 150 xxx KMs (Im not American) on it and so it is not like a brand new r154. That is the main reason I am just looking into this problem now, as do not want encounter in the future as I have destroyed 2 w58's

 

[figgie]

dirtyjz

you will not break that thrust washer unless you are doing the following.

Cutting sub 1.7 seconds 60 foot(18.2 meters) times and have an anti-lag system to help in achieving those. Even if you transmission has 225,000 miles (362102 km) on it


In any other form, the r154 will survive what you throw at them.

 

[Poodles]

See, it's been well known in other cars that the helical cut gears that reduce noise in the transmission can also force outwards on the case and allowing things to fly apart. It's the reason I think the reinforced front bearing plate from Marlin Crawler MIGHT stop thrust washer failure all together.

Nobody I know has actually TESTED this though...

 

[figgie]

See, it's been well known in other cars that the helical cut gears that reduce noise in the transmission can also force outwards on the case and allowing things to fly apart. It's the reason I think the reinforced front bearing plate from Marlin Crawler MIGHT stop thrust washer failure all together.

Nobody I know has actually TESTED this though...

no way to test it unless by trial and error (Marlin Crawler) or running the entire transmission under a finite analysis program.

 

[dirtyJZ]

Thanks for the responses most appreciated, found out the information i wanted to know