[Vwdiesel] 5+ years of engine noise 1.6TD mech head

[Mark Shepherd]

No cherries to pick? Just had some USA Lapins, and they were one of the best I've ever tasted, and not the usual bland crap we get... On the old head the 
recess had all but disappeared on #1 and #4. Apart from the obvious early markings on the pistons, which might have been from mis-timing of the cam had it 
not been for an experiment I did where I timed exactly with feeler gauges and then about 5 deg off for either side of TDC I re-released the cam pulley and
using vice grips tried to advance/retard the cam, and found each time it was resting the valves against the piston... Don't you remember commenting on 
how you felt it impossible to skim the head with the exhaust manifold still attached as the port lobes over hang...Well mine stopped overhanging ;o)... see 
pic!

http://imageshack.us/photo/my-images/222/tenthabradeka0.jpg/


At the time I bought shell bearings and wrist pins, but there was no wear. Not saying there can't be now, though as I didn't pull the sump and pistons after my 
recent careless breakage.
Can a bearing get damaged by terminal piston-valve clash, after all it is soft, but then again its a spread load?

Cheers
Mark

========================================
Message Received: Sep 01 2013, 07:30 PM
From: lbaird119 at aol.com
To: vwdiesel at vwfans.com
Cc: 
Subject: Re: [Vwdiesel] 5+ years of engine noise 1.6TD mech head


I said it wasn't from overskimming since I've seen new heads where the valves are higher than the head surface (slightly) and your old head likely still has 
the valves recessed regardless that you've skimmed it down.
>From your description, it sounds like you have wrist pin slop. Slow internet at the beach (none for the last couple days) so not going to try and listen here.
Loren


-----Original Message-----
From: Mark Shepherd 
To: vwdiesel 
Sent: Sat, Aug 31, 2013 11:51 am
Subject: [Vwdiesel] 5+ years of engine noise 1.6TD mech head


Hi chaps,
In an effort to cure my engine noise, I have decided to share a video of the 
sound of my engine!

http://s1329.photobucket.com/user/Quantum-man/media/IMGP2505_zps4a50dfac.mp4.html

As some may be aware this engine suffered from an overzealous head skim, and has 
always knocked since. Various experts have suggested big ends, little 
ends, injectors and tappets Turned out to be valve clash...[No discernible wear 
to shell bearings back in 2009]
No problem, because I stupidly broke the cam and cam belt with a finger tight 
tensioner, this summer. :o( 

Great, a genuine VW CX complete and unskimmed head was found and installed.

That should have cured my noise issue, however it hasn't. Just maybe I do have a 
bearing issue now due to the thump of the pistons hitting the valves on the 
old head and hammering the cam lobes enough to break the cam in 2 places.
Currently the knocking still happens like previously when decelerating with 
engine switched off but in gear, but now there does seem to be a change in sound 

when applying loading.The sound track clearly shows problem confined to one 
cylinder only and only on compression stroke. Previously the sound track had 
shown a secondary noise from another cylinder. I will see if I can confirm this 
from an old recording if I can find it. 
Most of the young mechanics I come across don't have experience with the 
expected noise levels of this type of engine...
Cheers,
Mark



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