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V8 Balance Shaft

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
jimmy57
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Re: V8 Balance Shaft

Post by jimmy57 » Tue Jan 01, 2019 11:13 pm

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.



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ggleavitt
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ggleavitt

Re: V8 Balance Shaft

Post by ggleavitt » Wed Jan 02, 2019 10:53 am

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 67 times


2005 2.5T AWD-193k
2008 V8 AWD Sport-122k

jimmy57
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Re: V8 Balance Shaft

Post by jimmy57 » Wed Jan 02, 2019 12:28 pm

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.



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Roger_850T
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Re: V8 Balance Shaft

Post by Roger_850T » Wed Jan 02, 2019 7:45 pm

jimmy57 wrote:
Tue Jan 01, 2019 11:13 pm
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


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

jimmy57
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Re: V8 Balance Shaft

Post by jimmy57 » Wed Jan 02, 2019 9:25 pm

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.



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Roger_850T
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Roger_850T

Re: V8 Balance Shaft

Post by Roger_850T » Sun Jan 13, 2019 1:32 pm

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:
IMG_0724.JPG
Exciting, I know. :shock:

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

Roger


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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ggleavitt
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Year and Model: XC90 05-2.5T, 08-V8S
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ggleavitt

Re: V8 Balance Shaft

Post by ggleavitt » Sun Jan 13, 2019 3:25 pm

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.


2005 2.5T AWD-193k
2008 V8 AWD Sport-122k

Masscomguru
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Re: V8 Balance Shaft

Post by Masscomguru » Mon Jan 14, 2019 4:56 am

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
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Re: V8 Balance Shaft

Post by Masscomguru » Wed Apr 03, 2019 6:31 pm

Any update?



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Roger_850T
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Roger_850T

Re: V8 Balance Shaft

Post by Roger_850T » Thu Apr 04, 2019 2:48 pm

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


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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