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Cam and Balance Shaft Spacer Bushes

 
Old 01-19-2019, 05:34 PM
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dlknight
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Default Cam and Balance Shaft Spacer Bushes

Hi Folks,

In the middle of a front end seal, waterpump and belts job on my 944 Turbo and wanted opinion on replacement of the spacer bushes.



On the 2 x balance shaft spacer bushes I can feel a very slight ridge when running my nail back and forth across the surface (left most bushes in photo)

On the camshaft spacer bush I cannot feel a ridge with my nail even though there is a line marked into the surface (right bush in photo).

So replace all three or just the balance shaft spacer bushes?

Thanks!
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Old 01-19-2019, 05:47 PM
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T&T Racing
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Originally Posted by dlknight View Post
Hi Folks,

In the middle of a front end seal, waterpump and belts job on my 944 Turbo and wanted opinion on replacement of the spacer bushes.



On the 2 x balance shaft spacer bushes I can feel a very slight ridge when running my nail back and forth across the surface (left most bushes in photo)

On the camshaft spacer bush I cannot feel a ridge with my nail even though there is a line marked into the surface (right bush in photo).

So replace all three or just the balance shaft spacer bushes?

Thanks!
ones with wear, ie feel an edge, replace
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Old 01-19-2019, 06:02 PM
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StoogeMoe
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I would replace them all. I had the camshaft one leak with only a slight groove. You're almost there. It's a lot harder to replace afterwards.
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Old 01-19-2019, 06:08 PM
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If they're out of the car, replace.
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Old 01-20-2019, 05:29 AM
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dlknight
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Yes you are right - I definitely don't want to have to contend with that damn cheesehead / spline bolt again on the camshaft sprocket!
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Old 01-20-2019, 11:30 AM
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thomasmryan
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does the oil pump drive show similar wear? I believe some motors have an odd size race so you might measure what you have prior to ordering.

Mercedes makes service seals that changes where the lip rides which is pretty awesome when the ridge wont polish out with 600 grit.
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Old 01-21-2019, 05:32 AM
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dlknight
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Originally Posted by thomasmryan View Post
does the oil pump drive show similar wear? I believe some motors have an odd size race so you might measure what you have prior to ordering.

Mercedes makes service seals that changes where the lip rides which is pretty awesome when the ridge wont polish out with 600 grit.
Haven't taken the oil pump drive out yet but I have a new one ready to fit when I get to it.
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Old 01-21-2019, 12:12 PM
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KevinGross
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I'd normally replace. However, if you can set the radial oil seal at a slightly different depth, to run on a different part of the bushing, then that bushing can be safely reused. Good luck!
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Old 01-23-2019, 01:52 PM
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dlknight
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Thanks Thomas - I've managed to get 1 x genuine porsche balance shaft bushing so far for ú20 so pretty happy with that also can see a 2nd one for ú27 and the camshaft flange is a bit more at ú36.99.

Problem with those sets I've seen like the one you posted is they are for the earlier cars I believe as the flanges are all the same size.

Later cars have a unique camshaft flange which is a slightly different size, my turbo is a 1990 model.
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Old 01-23-2019, 05:29 PM
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Swenny
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Originally Posted by KevinGross View Post
I'd normally replace. However, if you can set the radial oil seal at a slightly different depth, to run on a different part of the bushing, then that bushing can be safely reused. Good luck!
Ive done that and can verify that it works-no leaks
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