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 Valve shim part number

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little750
Biondino
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PostSubject: Valve shim part number   Wed Sep 30, 2015 4:10 pm

Anybody know the part number for the inlet valve spring shim for the roller upgrade on an A5 engine.
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Pete Roper
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PostSubject: Re: Valve shim part number   Wed Sep 30, 2015 10:01 pm

OK, some interesting developments here.

Firstly though the washer part# is 877847, you need four. The valve guide oil seals are #436438 four of those too.

Interestingly though the 2015 models DO NOT use shims under the valve seats and the valve springs have a different #.

Early springs were # 874335 but they have a supercession to 82976R and in the parts list they are NOT listed for models with the early timing system as using a shim. BUT, there is no suggestion that these springs don't need the shims when rollerising.

What is more interesting though is that for 2015 models, already rollerised, there is another new part # for the springs. B013517 and these DO NOT use the under spring seat shims.

The part #'s for valves remain the same so extrapolating from this the new springs are slightly different and therefore DO NOT require the shims.

That being the case, rather than buying the shims, just buy the new springs and fit them in place of the early type?

I would still replace the valve guide oil seals, (You're in there, why wouldn't you?) but while the new springs will probably be slightly more expensive than the shims my first instinct would be to go with them rather than the washers which are by their very nature a compromise.

YOMV.

Pete
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ghezzi
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PostSubject: Re: Valve shim part number   Wed Sep 30, 2015 10:32 pm

Curious. 8 valves & guides, but only 4 valve guide seals?
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Pete Roper
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PostSubject: Re: Valve shim part number   Wed Sep 30, 2015 10:55 pm

No, they all have seals, it's just that the exhaust valves being smaller and therefore less massive they obviously did the sums and didn't think valve float would be an issue. It's only the inlets that need shims so you need to replace the seals to install them. The exhausts remain untouched while the heads are off.

Pete
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little750
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PostSubject: Re: Valve shim part number   Wed Sep 30, 2015 11:41 pm

Thanks Pete
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Phang
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PostSubject: Re: Valve shim part number   Sun Oct 08, 2017 2:19 pm

Pete, 2015 models has different part number for cylinder head too.

I wondered  if the new spring B013517 is not a substitute for the old spring(874335) + shim combo in the old /flat tappet cylinder head when we rollerise it?
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Pete Roper
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PostSubject: Re: Valve shim part number   Thu Oct 12, 2017 3:59 pm

Been thinking about this. I haven't actually had a late model head 'in hand' as it were to compare to an earlier one. One thing that did occur to me was that there was a slight change to the machining of the head castings when they changed the o-ring type and location for sealing the breather/cam plates on the back of the heads. This predates 2015 though by several years and I don't know offhand whether the change actually resulted in a part# change as well.

Vexing.

Pete
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