[T3] ? Mystery of the Clacking Valves ?

[Jim Adney]

On 11 May 2011 at 17:13, David Yaghoubian wrote:

> If you've got one of those Sherlock Holmes pipes, spark it up... :)
> 
> Keeping this as succinct as possible to start, my super clean, 
> perfectly running 1776 (@~35K miles) developed a bad pushrod tube 
> leak in the outside tube for the #3 cyl last week.

You've painted quite a puzzle there, but you've described it well. I 
only come up with unlikely possibilities, like the adjuster locknuts 
not being tightened enough, or the rocker stands not being tight down 
on the heads, or the pushrods collapsing.

Where did the "tiny camera" look? If they just looked down the 
pushrod tube holes at the backside of the lifter, then that wouldn't 
be very interesting, but I don't know how they could get any kind of 
instrument inside the case to see the cam and lifter face.

The stock pushrods are alum tubes with steel ends. They are fairly 
easy to shorten, but impossible to lengthen. I think they are the 
best choice unless you run double springs and high rpms. The 110 cam 
is fairly mild, so I would guess that it will be okay, but that will 
still depend on how far you rev the engine.

One of the unsung "benefits" of the stock D-Jet FI is that it will 
rev limit at about 5000, which is pretty safe, especially if you have 
a counterweighted crank. However, I'm guessing that you have neither 
the stock FI nor a counterweighted crank.

DIsclaimer: I have no personal experience with 110 cams or oversize 
engines.

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