Aluminium 2.0 engine damaged

964-RSR · 07-08-2011, 09:30 AM

Hi,

I sent my 2.0 aluminium engine to a machine shop to install 930 oil squiters.

There is a probem (see pixes) with the labor done because, on the cranckshaft side, one hole for the oil squiter arrives at the same place where, under pressure oil goes through main journal.

Do you think this aluminium engine is out of order or can I use it as it is ?

With this larger hole, is there a risk the main bearing journal rotates on itself under pressure ?

The best solution would be re-plugg the engine ?

Thank you very much for your advices.

cgarr · cgarr's Garage

Doesn't the factory squirter get the oil from the same passage just up at the thru bolt area?

Or are you worried about an oil volume drop?

964-RSR · 07-08-2011, 10:05 AM

Craig,

Yes worried about an oil volume drop to main journal and a drop of oil pressure to main journal.

I think it is OK for oil to squiter

Thanks

rvanderpyl · rvanderpyl's Garage

It's aluminum, have it welded up and rebored, at the shop who did that's expense.

Schwarzeritter · 07-08-2011, 12:32 PM

Like the last poster recommended. I would suggest having it welded, then cleaned up and brought into spec. You also should have it cleaned up just incase. Beyond that, how in the heck did that happen? Was something dropped on it?

Walt Fricke · 07-08-2011, 02:58 PM

Is that the start of the hole they drilled to get oil to that squirter? That's for sure not where the factory picked up the oil for that purpose. Is this where their drilling down into the bearing web for the squirter ended up? They missed the target case throughbolt passageway and ended up coming out here?

Or is it just where someone started a hole and then thought better of it?

Not clear that it matters,though. The squirters all get their oil from the passage from the throughbolt to the bearing saddle, so they already suck up some of that oil. If a squirter squirts out, you have an oiling problem and that bearing will get hot PDQ. But otherwise not.

964-RSR · 07-08-2011, 11:28 PM

Walt,

"Is this where their drilling down into the bearing web for the squirter ended up? They missed the target case throughbolt passageway and ended up coming out here?"

Yes this is what happened !

The drill for this squiter is not in the same line as 2 other holes as you can see below. He took the same angle and arrived 5mm lower with this problem.

Walt Fricke · 07-09-2011, 05:25 AM

Well, that's pretty clearly a mistake.

I don't see welding - you weld the journal end, now you have to machine it. Maybe a little dab of weld won't matter or warp anything, but why take the chance.

And welding up the other end and moving it 5mm? Now you have a blank passage. Weaken the web? Don't know, but not a benefit.

Me? After talking with the machinist about some price adjustment, I'd use it as is unless one of the professional machinist/engine builders like Steve Weiner and some others chime in with factors I have overlooked (or never knew about in the first place. Because I don't see this changing anything in the oil distribution. The bearing/crank is a nice restriction to oil flow, and the fact that the branch is closer to the crank than normal shouldn't affect anything. It is not going to unseat the bearing, which is a tight crush fit. And it won't steal any more oil than would be stolen farther back along the throughbolt.

Or consider a screw plug on the squirter end, and install a squirter in the other web for that piston? Just a hurried thought, but I think that bolt has oil for a journal also, etc.

Walt