De Jeeper

I dont really understand the pitfalls of rebuilding this motor. I get they damaged the bearing but thats it. U could check the flange area for stress cracks if u were worried that they pulled against the case. Otherwise the motor is intact. What am i missing? I get Jakes screening process and how pickey he is but for the rest of the crowd its seems low risk.

also not sure what the shops insurance would cover. My bet would be the r and r for the bearing which would include a tear down to swap the bearing but not a rebuild that most if us would feel is correct. Hell i bet it would be cheaoer the get a porsche short block and swap over the rest.

Nick_L

That's interesting. If it was 100% free from lubrication it's a manufacturing issue. You never seal a bearing without putting some lubrication in it...never. The normal fill is 15% of the void space, which would look like 'very little'. When the bearing is run it will press away some of the 15% so after some time it will be even less, but they don't need much.

Charles, will brinelling occure 100% of the time when you pull one of these bearings?

Charles Navarro

This is normal. Bearing will have no lube in it but if you pull the bearing, there will be a substantial amount of very dirty oil behind the bearing. Ask most any mechanic that has replaced an IMS bearing and they will confirm this. The grease seal lip gets hard and stops sealing, allowing the engine oil to wash the grease out. At that point, the seal impedes lubricant flow in and out of the bearing.

[QUOTE}Charles, will brinelling occure 100% of the time when you pull one of these bearings?[/QUOTE]

Once you load the inner race to pull the bearings, the force transferred through the ***** to the outer race can dent the races and *****. That's why it's standard operating practice to replace any bearing that has been pulled in this way. This isn't something I came up with on my own.

Scott at Team Harco

Of course. I have probably heard this term before. Never thought much about it.

I guess this is more of a frunk job. Still doesn't change my theory on Jake's vetting process. He checks the owner first...

wildbilly32

WHEW! Good thing I got in before he starting the vetting process. I would have made it past a close intense scrutiny!

...but I totally understand why it is becoming necessary these days.

dgjks6

Couple of newb questions. So we confirmed that he has the larger non serviceable bearing. What makes it non serviceable? I’ve never seen one up close. But the way it works from what I understand for a normal bearing is that the tools attaches to the stud coming through the inner race. You remove the clip holding the outer race/entire bearing and pull it out. Why would that not work for the larger bearing? It looks like from the larger IMS bearing pic above you can remove the clip and just pull the bearing out? I was under the impression that the hole in the case the IMS comes through is not big enough for the bearing to move out. But then how was he able to pull it out 3-4mm?

Anyone watch Home Built By Jeff? He tried to pull his IMS bearing out with a home made tool. Banged on it for a while and no luck. So he just put it back together and is still driving the car.

and is that sealant in the original pic between the case halves normal?

Scott at Team Harco

WHEW - made it by this much...

Noz1974

I'm speculating here but would it be possible to pull the seal and do some sort of visual inspection, it may be the mechanic started the process and realised what was happening before he got any serious load on there , if you could sneak a look at the outer bearing race it may indicate whether it's damaged or not. I presume you would see the indentation in the bearing race with a scope or something similar, also turning the bearing and feeling for any notchiness in the feel maybe ?

808Bill

The bearing is larger than the bore of the case.

4Driver4

You might be able to spot a bad bearing, but you won't be able to confirm that it is OK.

These dents (if there) are probably visibly insignificant...like you might be able to see them if you removed the ***** and examined them under a magnifying glass. And you'll need the feel of a safe cracker to detect anything more than blatantly obvious roughness just by turning the bearing.
Bearings like this have very precise tolerances and turn at very high speed. There really is not way to confirm that damage has not been done.

4Driver4

I didn't mean to imply that this was just about heat. It's a factor, especially when the bearing starts to fail and runs a bit hotter.
It's probably more so about inadequate lubrication.

dgjks6

OK Still trying to work this out. If he put the puller on the stud and the tube catcher thing through the hole that is smaller than the bearing it would be resting on the bearing, then how did he get the bearing to move? Doesn’t pulling on the stud bring the bearing into the tube catcher thing? If the bearing is bigger than the puller it won’t fit.

If I understand how a bearing puller works. Which I think I do since I have used a bunch of them in the past.

If he used a TON of force he could have pulled I guess the inner race in and destroyed the bearing. But the pic looks like the bearing is intact.

Does this make sense to anyone else or am I way off?

Or maybe he tried to pull it with a slide hammer and not the tool.

tommelton

There is room between the shaft and included bearing and the case (block). Attempting to pull the bearing from the shaft would then place the bearing against the case. The act of pulling the bearing via the stud, the stud which only contacts the bearing on the inner race, will destroy the bearing. So now you have a bearing, not seated fully in the IMShaft, that if pushed back into the shaft is now damaged.

The only way to now correct is to disassemble the case/block/engine to get to the IMS.

-Tom

Optionman1

Is it normal procedure when installing the "Solution" to notch the block first, before removing the old imsb ?

Scott at Team Harco

It doesn't really matter. One advantage is that any debris created won't (shouldn't) contaminate the area of the IMS/ IMSB. On the other hand - if you can't get the bearing out, you've just wasted that time/ effort.