[Vwdiesel] Oil flow problem??

[Bryan Belman]

That is what it is sounding like to me, you replacement vacuum pump is locking up.  That would cause the squeel, and for sure would cause your oil pump to STOP pumping as the oil pump has a shaft that comes up and sits in a slot in the bottom of the vacuum pump.  The intermediate shaft drives the vacuum pump and it drives the oil pump.

Replace the vacuum pump with a standard VW diaphragm model, that is what I would do.

this could be a very dangerous situation if you let it continue.  Good think you caught it early.

 Bryan Belman, Pt. Pleasant, NJ
04 Jetta Wagon TDI PD, 100hp, 5sp -- running :)
92 Jetta 1.6 Eco-Turbo Diesel -- not running :<
82 Diesel Westy 1.9NA -- not running :{
70 Type 1 stock Beetle -- Not running :( 




________________________________
From: Craig Osborn <cosborn at epix.net>
To: Sandy Cameron <scameron at storm.ca>; vwdiesel at audifans.com
Sent: Sun, January 3, 2010 11:07:52 PM
Subject: Re: [Vwdiesel] Oil flow problem??

I replaced the original diaphragm vacuum pump with a "newer design" rotary
vacuum pump this summer.  I mention this in case that makes the system more
susceptible to a Vpump lock up in cold weather.  In your opinion, should I
go back to the diaphragm style pump?  I will look for leaks in all of the
hoses and fittings.

Craig 


> -----Original Message-----
> From: Sandy Cameron [mailto:scameron at storm.ca] 
> Sent: Sunday, January 03, 2010 9:03 PM
> To: Craig Osborn; vwdiesel at audifans.com
> Subject: Re: [Vwdiesel] Oil flow problem??
> 
> 
> At 07:26 PM 1/3/2010 -0500, you wrote:
> 
> >but ran rough which is usual behavior in such temperatures.  After 
> >warming it up for about five minutes, I proceeded to set out 
> onto the 
> >road.  Almost immediately the engine started to squeal.  
> Initially, I 
> >thought it was a loose belt and ignored the noise.  After a 
> 1/2 mile or 
> >so, the oil light came on and the engine lost some power.
> 
> Boy, you were lucky! 
> 
> The oil pump is driven by the accs'y shaft, which has a 
> smooth faced pulley that runs against the back (smooth) face 
> of the timing belt. Friction drive ONLY.
> 
> A combination of heavy oil and a not quite tight enough 
> timing belt could stall the oil pump long enough to cause a seize-up
> 
> I suspect ice in the vacuum pump might be the real culprit. 
> It is co-shafted with the oil pump, and if there are leaks in 
> the vacuum system, enough moisture could be drawn in to it to 
> freeze up the V-pump, stalling the oil pump, accy shaft, etc.
> 
> The screech was caused by the timing belt screeching over the 
> face of the acc'y shaft pulley.  The oil pressure light 
> should have been on the whole time, unless the ice that 
> stalled the V-pump was sucked in after the engine started. My 
> guess is it stalled the pump at the same time as the screech started.
> 
> Better check your V-pump, plumbing, etc. The timing belt 
> tension is probably OK, or the next sound you would have 
> heard would have been bearing failure!
> 
> Sandy
> 
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