[Vwdiesel] Timing 101 question please

[gary]

Since all of the exhaust valves showed signs of contact, I would suspect
that the cam timing was not set correctly. In this case, too far
retarded. Exhaust valves still open when the piston came up.

Assuming they followed procedures, changing the injection timing will
NOT change cam timing.

Having to use two head gaskets really bother me. Something was not right
from the get go.

I would really be interested to know what your piston projection is for
the 1.9.

My memory fails me, did you check cam timing before? The slot at the
back of the cam parallel with the head? Verified by looking at the #1
cam lobes for an even "V" sticking up?

-Gary

On Mon, 2004-03-22 at 11:53, 82 Diesel Westy wrote:
> This should be an easy one for you all.
> That Golf Steam stuff is real serious, I need to read
> up on that!!!!
> 
> Anyway, I think I am going back to stock 1.6TD
> Finally pulled apart my failed 1.9NA with broken
> lifters.
> Review: the motor ran fine for 15K, but always "felt"
> as if clearance was to close.
> It had a hot start issue needing 7 or 8 rotations to
> start without glow plugs when hot.  Pulling cold start
> seemed to help.
> This was agreed to be retarded timing, so it was
> increased .10, obviously too much.  This did fix that
> hot start issue but the lifters broke @500 miles
> later.
> 
> 
> Question??
> 1.  Is it possible for a motor to run 500-1000 miles
> with valve contact, assuming hydraulic valves are
> lessening the impact on valve stem and cam?
> 
> Or, could the valves have been hitting all along,
> there were 2 head gaskets on this motor, to allow for
> additional clearance?  thanks Overland, your the best.
> 
> 
> 2.  If the timing was advanced above spec, would the
> intake or exhaust valves make contact with pistons?
> 
> 
> 3.  Does rotating the pump to set timing stroke not
> only controls the point at which fuel is injected into
> TDC piston stroke but machanically moves cam as well?
> 
> 
> 
> 
> 
> Here is what I found:
> 1. Timing cam did not slip, that is for sure, cam bolt
> was at proper torque.
> 2. #1 Ex. valve lifter exploded, valve keeper gone. 
> #2 Ex. valve cracked on the surface to cam.  Valves
> not bent, head is repairable.
> All exhaust valves hitting
> #1 and #2 have deeper ridges on top of piston, can
> barley feel ridges on #3 and #4 for valve contact.
> 
> In the end, I feel sure #1 exhaust lifter was cracked
> for some time and finally exploded from lack of oil.
> 
> Any expert opinion welcome.  Thanks so much..<>
> 
> 
> =====
> Bryan Belman, Pt Pleasant, NJ
> 04 Jetta Wagon TDI PD, 100hp, 5sp
> 82 Westfalia Diesel, 1.9L NA hybrid, under body restoration & engine re-work
> 90 Audi 200, 2.2L Turbo FWD
> 70 Type 1 Beetle