[T3] How's the trip going?

john carartbyjohn.com john at carartbyjohn.com
Fri Jun 17 06:46:33 PDT 2022

Good morning. We laid a pushrod across the end of the valves and they are all the same height...on both heads. No anomalies there.

All of the head studs/nuts were tight.

I am starting to consider the fact that I just did the valve check in the wrong order or something.  We can find no smoking gun in the heads or otherwise that would explain what I experienced when checking the valves.

We are going to throw the heads back on, torque them, reinstall the rocker assembly and pushrods and recheck the valve lash adjustment this morning.  Wish I had thought to do that before pulling it all apart.

I do have a nice new set of heads from Alex that I will be installing once we figure out the issue with the valve train geometry. The spring pressure comparison between the new head and the old is noticeable.  I was able to compress the spring with my thumbs enough to pop the keepers out on the old heads. Can barely move the new springs with full pressure from my palm.

I am also going to crack open the carbs and see if there is something there that would explain the loss of power. Kind of grasping at straws at this point.

Will post more of what we find.

BTW, we did you cylinder head swap in Brian's garage during the Myrtle Creek Invasion.

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From: type3-vwtype3.org <type3-vwtype3.org-bounces at lists.vwtype3.org> on behalf of Jim Adney <jadney at vwtype3.org>
Sent: Friday, June 17, 2022 6:27:01 AM
To: type3 at vwtype3.org <type3 at vwtype3.org>
Subject: Re: [T3] How's the trip going?

Sounds like you've got the possibilities separated correctly. Tight valve
problems have to be in the head, including the valves. Can't be anything
else in the valve train, as wear there just makes for loose valves. That
includes the cam and the head studs.

Afterthought: If the head studs had loosened, allowing the jugs to move
around, they can dig into the case, which might make for tight valves. Seems
unlikely, but you should be able to see that easily, and you would have
noticed the loose head stud nuts.

Put a straightedge across the ends of the valves to see if they all end up at
the same level. I thought I remembered that Es and Is were slightly different
lengths, but Bentley shows both to be 112.00 mm OAL. See which ones stick
up a bit more, but all of this gets messed up by a typical valve job. Still, you
might learn something by comparing what you see at E3 compared to the
other Es.

If your straightedge is long enough, you can check its clearance above the
valve cover sealing rim at each end, to see if it's tilted.

I heard that Alex was bringing a set of heads for you. That's probably your
best option at this point. Bring your old ones home for a post mortem later.


On 17 Jun 2022 at 7:13, john carartbyjohn.com wrote:

> We pulled Sophy's engine and tore it down to the point we could pull the
> heads. No obvious cause of the 3 exhaust valves tightening to the point I
> could not adjust them. Only causes of excessive valve tightening the brain
> trust here could come up with was valve stretch,  wear of the seating
> surface on the valve,  valve seat wear, or the valve seats pounding into
> the heads. Everything else would cause loose valves like bent pushrods,
> pushrod end wear, cup wear on the sticker arm or lifter,  etc. Everything
> looked good with only expected normal wear.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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