[Vwdiesel] rabbit head

[peter blake]

James,
  That makes total sense to me. What bothers me is that one
of my friends, a long time vw mechanic, insisted that I had set
the timing belt too loose. Sooooo, I let him snug it up more
than I had originally set it. I should have trusted my own
judgement it seems.  One question, does the pump now need to
be rebuilt?  I'm probably not going to mess w that engine much
anymore anyways.  I'm trying to get my hands on a 1.9td as I
type.  Hopefully, there will be one heading my way shortly.
Peter

--- On Sun, 1/22/12, James Hansen <jhsg at sasktel.net> wrote:

> From: James Hansen <jhsg at sasktel.net>
> Subject: Re: [Vwdiesel] rabbit head
> To: "'diesel'" <vwdiesel at vwfans.com>
> Date: Sunday, January 22, 2012, 9:23 PM
> Sorry to hear of this Peter.
> Probably too tight a belt, you get wear on the injection
> pump input shaft
> bushing, and it pushes the belt off as the pulley tips.
> Belt should be final tight when cold so that you can still
> slide the belt
> back and forth on the grooves of the cam sprocket. 
> Since the motor grows
> taller when it heats up, you set this cold.  If you
> can't slide the belt
> around at all on the cam sprocket, it's too tight. 
> The new tensioners are
> spring loaded, but the old ones, you have to do it just
> so.
> 
> Other reason is the injection pump bracket might be loose,
> or loose bolts
> holding the pump, particularly the one closest to the
> injector pipes.
> 
> You should be able to make one head out of the two, but
> that was a pretty
> hard tap dance.  As long as the lifter bores are still
> good, you should be
> okay and just swap parts.  I would be tempted to renew
> the exhaust valves,
> as they get the hardest life.
> -james
> 
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com
> [mailto:vwdiesel-bounces at vwfans.com]
> On
> Behalf Of peter blake
> Sent: January-22-12 10:59 PM
> To: diesel
> Subject: [Vwdiesel] rabbit head
> 
>   So I now know what happens when the timing belt
> jumps a tooth 
> or two.  The exhaust valves did a tap dance on the
> pistons and
> managed to snap the cam at the no. 1 cylinder.  
>   The real question is why my new belt walked off the
> pulley and
> self machined against the cover.  When I pulled the
> cover off the
> belt was about 1/2" wide and loose. I haven't investigated
> further.
>   I cleaned the top of the block and the bottom of the
> head and
> tried to slip in a .003" feeler gauge and couldn't. 
> So I'm hoping
> it is still flat enuf to be usable.  
>   My plan now is to take the head off the Jetta, which
> has the burnt
> out injector hole and remove the valves followers and
> camshaft and
> use them in the rabbit head.  And then put that head
> on the Jetta so
> that I have at least one functional vehicle.
>   A couple of problems I have r removing two of the
> followers from
> the head.  The valves punched up far enuf to put a
> crown in the face
> of the follower.  The other problem is whether or not
> I can even use
> the valves at all. I'm hoping to just lap them in and be
> done with it.
> Any thots as to why the belt would walk off the pulleys and
> then 
> stretch?  New belt new water pump and new tensioner,
> why wouldn't
> it track straight?  
> Peter
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