V8 Balance Shaft

Post by **jimmy57** » 01 Jan 2019, 23:13

Those bearings are both industry standard. A good part supplier, if you have one with some good people, could measure ID, OD and width and get them. They may not have brand choice though. The roller count can and does vary in the same industry number bearing.
The drain hole to be drilled is easy and it's aluminum. The CRITICAL note is to limit drilling to the one wall depth. 6mm is ample travel. If you go through the cavity that is open to bell housing/back of block and go through the next wall that is the crankcase just above oil slinging crankshaft bits.

Post by **ggleavitt** » 02 Jan 2019, 10:53

https://forums.swedespeed.com/showthrea ... ure-thread, some reference to the re-work plus alternative PNs for the bearings. See attached for additional screenshots of the re-work-

B8444S CB Shaft Rework_ScreenshotVIDA.pdf: (158.56 KiB) Downloaded 914 times

Post by **jimmy57** » 02 Jan 2019, 12:28

They didn't ask me but it seems a better thing to do in the rear bearing saddle area is to take a Dremel or other tool with a burr and grind a groove down the bottom middle. There is a hole in the balance shaft case that goes into the hollow cavity already. If debris blocks the drilled one why have the water go to the mid point of bearing before it can run through the ground reliefs on saddle sides.

Post by **Roger_850T** » 02 Jan 2019, 19:45

jimmy57 wrote: ↑01 Jan 2019, 23:13 The drain hole to be drilled is easy and it's aluminum. The CRITICAL note is to limit drilling to the one wall depth. 6mm is ample travel. If you go through the cavity that is open to bell housing/back of block and go through the next wall that is the crankcase just above oil slinging crankshaft bits.

jimmy57,

Thank you, I think that is highly important information! I had not realized until your comment and looking at the diagram that I really only need to drill through 3mm of material, with a few mm of cavity below. It would be VERY easy to go too far!

Tonight I was able to pull the old inner race off the back of the Balance Shaft, and the BS looks to be in very good condition, no need for replacement.

Roger

Post by **jimmy57** » 02 Jan 2019, 21:25

I have worked on vehicles for decades and trained a lot of people (old fart ramble). Mechanically inclined persons have no trouble wrenching things. The issue is to know when not to wrench. Like NOT taking out Mazda RWD transmission bolt that is at the level you would expect fill plug and on the side that is more accessible only to hear the reverse idler gear lever fall to bottom of the trans, or NOT to use an impact on some engines' crankshaft bolt and have to hammer it a bit to loosen and the harmonic balancer rubber shears and balancer fails within 5000 miles "for no reason", or NOT taking the variable cam timing hub bolt out to replace cam seal and then realize you ain't driving that car to work or school until you figure out how to to get that no woodruff key gear back in the right place on that cam...you get the idea.

Post by **Roger_850T** » 13 Jan 2019, 13:32

Not much progress lately. Ordered parts, waiting for them to arrive. I decided to do the water pump while I'm at it - I would be really unhappy if the existing water pump with 140k miles on it chose to fail in the next year, so I figured I'd do it now.

Parts have been straightforward, but the fluids have not. Volvo no longer carries the recommended thread lubricant or timing cover sealant. Fortunately FCP had a Wurth version of the sealant, and AutohausAZ had the Febi version of the "bolted joint compound". The "bolted joint compound" seems to be a thread lubricant / anti seize, but without the chemicals that are bad for oxygen sensors and the like.

I did get the hole drilled. Here's what it's like:

Exciting, I know.

Next week I'll hopefully have some tools together and can start on re-assembling things. Cheers!

Roger

Post by **ggleavitt** » 13 Jan 2019, 15:25

This is VERY cool. You're already way ahead of anything I've personally ever seen on one spot, thanks for your continued posts and photos.

Masscomguru · Post by **Masscomguru** » 14 Jan 2019, 04:56

This IS a very cool thread. Sorry you have to go through this, but threads like this expose the mystery of the V8 and seeing it torn down definately gives people confidence in owning one when it comes to at least valve cover gaskets and such. Keep it coming and thank you!

Masscomguru · Post by **Masscomguru** » 03 Apr 2019, 18:31

Any update?

Post by **Roger_850T** » 04 Apr 2019, 14:48

Hi Masscompguru,

Mostly done, but not quite. Actually, I had it all back together and took it on a test drive, but apparently managed to not get the rear valve cover gasket quite right, as it's leaking significantly, so it's coming apart again.

Once I get it all done, I'll be posting more pictures, plus details of tools and things I learned along the way.

Roger

V8 Balance Shaft

Re: V8 Balance Shaft