spun bearing

[gsxeclipse97]

My girl friends car spun a bearing last week on cylinder 1. I dropped the oil pan and i noticed that there is a noticeable amount of movement on cylinder 2 3 4, Its not like the movement that is present on the one that spun but there is some movement. I was wondering if this is normal or should there be no movement at all when you try to move the bearing caps?

Thanks
gsxeclipse97

 

[Rob10_99]

Side to side, or up and down?
There's usually some side to side that's noticable, I think its .050" limit, which is pretty good size. But bearings are a lot less than that, can't recall tolerances atm, something like .012" ?

 

[gsxeclipse97]

its side to side i did not check for up and down. I would say i can move it at least 1mm. I know when i had my motor rebuilt i do not remember there being that much play between caps. the other three are the factory ones. could the excess movement be due to wear?

 

[ziggo0]

There should be very little to no movement at all. If she spun one bearing, it's almost certain there is damage to the other ones (if the engine was starved of oil). if the rods move from front of car to back of car, there is a very good chance they are spun/damaged. How does the crank journal look on the one that spun?

 

[Rob10_99]

Yeah its just a part that wears, there's no bearings and its not really a load surface, but it does see load if your crank isn't 100% true concentric to centerline.

 

[gsxeclipse97]

There should be very little to no movement at all. If she spun one bearing, it's almost certain there is damage to the other ones (if the engine was starved of oil). if the rods move from front of car to back of car, there is a very good chance they are spun/damaged. How does the crank journal look on the one that spun?

cylinder 1 is not smooth. It has some rough patches on it. I have not checked 2 3 4 because I was not sure if the amount of movement was normal. Im rather concerned about the rest of the engine because cylinder 1 is right after the oil pump so that would meant that nothing in the motor was getting enough oil. including head an turbo.

 

[ziggo0]

Well...I can break it down for ya the best I can. In short, it's going to cost.

If it's not smooth and the bearing spun, it most likely made the rod in cyl1 out of round by spinning, taking away material of the rod. At this same time, as the bearing spuns (spins ) it chews away at the crank, making it out of round & shape...

This means you need to pull the engine and take the crank to a machinist and see what he says about it. Depending on how bad it is, it might be junked. If it was merely surface damage, it might be able to be turned (ground down .25mm, or undersized).

On top of all this, that piston/rod also needs to be pulled and taken to him to see what he says about the rod's large end. Since the bearing spun damage is almost guaranteed. From what you described the other 3 cylinders sound to be in just as bad shape...did your lady run this engine out of oil from a leak? Perhaps oil pump failure and she didn't notice the gauge not moving?

Edit: Heads are more forgiving but if your mechanically inclined you take investigate that on your own. If the turbo was starved of oil and spun excessively there is a good chance it's bearings got hurt as well...don't quote me on that, however if there was oil pressure going to the turbo when this bearing was being ground into fine metal powder, there is a chance that got to run through your turbo's bearings...so either way, total rod bearing failure does some big damage if it's not caught RIGHT AWAY.

 

[gsxeclipse97]

It didn't knock at first but it wouldn't stay on. So I pulled it into the garage and that when it started knocking. When I took off the cap the bearing was still there. The oil was full, but the car was running perfect.. Best car has run since we have had it. I'm going to check the other three today and see how bad the damage is.

 

[gsxeclipse97]

So I pulled 2 3 4 last night and they were toast as well but 2 and 3 were the best of the 4 and, 4 still had a half of a bearing on there that looked untouched. I am trying to put everything back now cause I do not know what is going to happen with the car now but I'm having some trouble getting the caps back on there. anyone have any tips for doing so?

 

[BogusSVO]

if the caps are not sliding on over the bolts easly.. means (to me) that the rods have been over heated and caused the bore to spread... resize the rods or replace.

some people on the board say not to resize the big end, for about the same reasons not to grind a crank.. you may get thu the surface hardning of the part.

 

[gsxeclipse97]

Ok well we are planning th replace the engine in the car but we put a new set of bearing in there just to see how long they would last. Well the car started up and idles great has plenty of oil pressure. but, when we put it in drive it just dies... or in reverse. any thoughts as to why it just dies without warning.