Whats up everybody i have a evo 9 i can not figure out the problem maybe some one experienced the same when i push on the clutch it moves the crank and breaks the crank sensor i know the crank has play but the motor was just rebuilt with oem everything i can not figure out the problem only drove 250 miles on the new motor when this happened let me know if anyone has any ideas... Thanks

 

thrust bearing is bad.
check how much actual play there is with a dial gauge.
probably have to pull the engine out.

call your engine builder.

 

yea but the engine was just redone that could happen in 250 miles?

 

sounds like something has gone wrong.
call your engine builder and explain to them the situation.
if it's as bad as you're saying, the engine will need to be removed.

stock crank end walk measurement is like 0.1mm. not enough to smash Crank angle sensors.

 

Sounds like a lack of a thrust bearing

 

Or the thrust bearing is in backwards Deff would not drive it till the oil pan is pulled and check the thrust bearing

 

yea thanks for the info the motor is already out taking it apart tomorrow.keep you posted

 

Yeah, check that thrust bearing.

 

A poster here maybe three weeks ago had the exact same problem - new build and crank walk. Then he pulled the pan and posted pictures. Part of the thrust bearing had fallen out.

 

But the thing is that it moves enough to brake the crank position sensor

 

... then the thrust bearing has probably FALLEN OUT...

 

Yeah if the thrust bearing isn't in there or has "worn" out due to not being installed properly then it would move enough to break the sensor. Well it's the blade that breaks the sensor not the crank itself :P Good luck.

Aaron

 

it ended up being that the thrust bearing came out but the crank has a groove now

 

you wont have play if the thrust bearings are backwards, you will have a problem with metal pieces tho.

I will put $$$ on no thrust bearings on one side or both sides.

 

i cant imagine how is that this happen, usually the bearings are lock in place after you install the main bearing cap!