[T3] clacking valves cont'd...:(
Keith Park
topnotch at nycap.rr.com
Sun May 15 08:29:56 PDT 2011
Two thoughts, pull your oil sump plate and stick a flashlight up in there,
you can see the cam lobes... see how they look, on the base and on the lobe.
Im guessing this may have been the end result of not having the valve
geometry set up right, but that's a guess right now, Ive seen "reputable"
builders get it so wrong that the valve never aligns with the adjuster thru
any part of the sweep and that puts tremendous loads and wear on things.
Stick a pair of water pump plyers (slip joint) on the valve stem after
removing the rocker assy, see how much play you have in the guides. Rule of
thumb is when the exausts are about twice the intake its time for a valve
job.
Keith
Top Notch Restorations
topnotch at nycap.rr.com
http://www.a383ina68.addr.com/radiorest/main.htm
71 Squareback "Hothe"
65 Notchback "El Baja Rojo"
65 Squareback "Eggcrate"
87 golf "Winterat"
93 RX7 "Redstur"
-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of David
Yaghoubian
Sent: Sunday, May 15, 2011 3:58 AM
To: type3 at vwtype3.org
Subject: [T3] clacking valves cont'd...:(
I drove ~20 miles and did the valve check dead cold. Readings are not
encouraging:
#1 Exhaust .013, Intake .012
#2 Ex .004 Int. .008
#3 Ex .006 Int. .006
#4 Ex. .004 Int. .006
My current hypothesis, putting everything together as best I can, is
that I am the Pwned by Lack of ZDDP posterboy of 2011. I'm guessing
the cam and lifters (and potentially front cam bearing) are severely
worn...exponentially towards the front of the engine based on the
pattern in the clearance readings. The #1 exhaust adjustment screw is
now completely flush with the locknut. I still can't figure out how
that steel #3 exhaust pushrod bent, but my guess is that the impact
of the force that bent it either screwed the cam, the lifters, the
front cam bearing (which is closest to that pushrod) or all of the
above. Perhaps it was the inverse... worn cam/bearing/lifters bent
the rod somehow? I'm thinking ZDDP lack could be the culprit, since
this engine has been obscenely well maintained and pampered, and to
this day has never skipped a beat.
I'm going to drive it 20-30 miles again and repeat the valve check,
but if the trend continues, I'm going to run out of thread on the #1
ex. valve soon. Hence, I think I'm looking forward to pulling the
engine soon and replacing the cam, lifters, and cam bearings at the
very least. Thoughts? Also, I checked the printed spec sheet from the
build dyno test and under cam it says "TM-10". Does that ring any bells?
Thanks again all,
Dave Y.
68 sqbk
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