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gilber33

1989 E30 325i Progress

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19 hours ago, gilber33 said:

Has anyone done a removable core support on their e30? As I get ready to pull the engine for the 3rd time to check the clutch and to put in the rebuilt m20, a removable core support sounds awfully tempting.

I think @Sam_Holzmann has?

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Well if any one can chime in with some pointers or if it's worth the work that would be greatly appreciated.

From what I could dig up it doesn't look like there's one way to do it and you kinda have to dive in, cut it out, and then figure it out from there.

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30 minutes ago, gilber33 said:

Well if any one can chime in with some pointers or if it's worth the work that would be greatly appreciated.

From what I could dig up it doesn't look like there's one way to do it and you kinda have to dive in, cut it out, and then figure it out from there.

 

 

blast from the past 

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Two suggestions

#1 Use rivnuts on the chassis side to bolt the core support back in with. It's handy as hell
#2 Make sure to slice things to you can remove your core support without needing to pull the fenders. 
#2.5 Have a couple beers, slicing into your core support feels like it should be more calculated than it really is, and a little grinder operation lubricant never hurts. 

I used a new core support because mine was bent, so I had the luxury of truly destroying it.

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I was planning on using rivnuts. Seems much easier than welding nuts for bolts. 

I would much rather cut it out without having to pull the fenders. I assume that if I am slicing it so it can ultimately be removed without needing to pull the fenders I shouldnt need to pull the fenders off to do the initial cuts? 

I will make sure the mini fridge in the garage is stocked before I start cutting. 

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The joints need to move smoothly with no grit, binding, or increase in resistance. When you grab the yoke and the shaft and check it for freeplay, there should be none.

CSB should have no cracks in the rubber and the bearing should be tight and quiet as it rotates. 

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In regards to the two connectors Chris identified,  the first 2 things to check when an M20 isnt starting after a teardown is

1) did the fuel lines get swapped?

2) did those two connectors get swapped?

 

IMO Cleaning up an engine is the most satisfying part of wrenching. 

 

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Redid the crank bearings last night and I’m glad I did. I didn’t clean it as thoroughly as I could have before. Cleaned all the piston rings grooves and started measuring ring gaps. 

The Bentley Manual calls for a .012 - .020 gap and all the rings came in at .013 on the first two cylinders. Looks like I might be able to get away without having to do any filing. 

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1 hour ago, gilber33 said:

Redid the crank bearings last night and I’m glad I did. I didn’t clean it as thoroughly as I could have before. Cleaned all the piston rings grooves and started measuring ring gaps. 

The Bentley Manual calls for a .012 - .020 gap and all the rings came in at .013 on the first two cylinders. Looks like I might be able to get away without having to do any filing. 

Did you check clearance with plastigage?

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10 minutes ago, gilber33 said:

Nope. In my mind, if it was fine with the old bearings in there before, it’s going to at a minimum be better with new ones. 

Not that I haven't done the same, but from a manufacturing standpoint this is terrible logic. 

I'm glad you get to avoid filing rings, that's a tedious task that usually requires a spare ring or two! 

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1 hour ago, GunMetalGrey said:

Not that I haven't done the same, but from a manufacturing standpoint this is terrible logic. 

I'm glad you get to avoid filing rings, that's a tedious task that usually requires a spare ring or two! 

I knoooowwwwww. I guess I can check the clearances. I’ve taken back apart once. I know you’re supposed to do it it dry but I’ve already lubed it up. Will I be fine taking the crank out and wiping down the bearings to remove most of the oil? 

Also, can anyone confirm that the bearing clearance should be between .03-.07 mm?

 

edit: bought some plastigauge. I’ll pull the crank off and wipe down the bearings and measure the clearance section. 

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