[T3] Removing Oil Pump -In Car (update 3)

[jadney at vwtype3.org]

On 14 Apr 2026 at 21:17, EL PUERCO wrote:

>   3. Keith, I use Silverline bearings all the way and always (tough to find
> sometimes).  I do wipe off the coating at final install. 

I'm not familiar with Silverline bearings. Tell me about them. 

What is the coating that you wipe off?

> One thing I forgot about was that during break in at about 10 minutes running around
> 2500 rpm the oil light came on.  I shut it down right away.  

Yes, this sounds disturbing. It seems like the only things that could be going 
on here are a short in the wire to the oil pressure switch or a sudden drop in 
pressure. Assuming a wiring problem is unlikely, what could cause a sudden 
drop in pressure? I can think of 2 possibilities:

1) One of the pressure relief valves had been stuck and suddenly released, 
letting oil flow into a space previously filled with air. This would cause a very 
brief drop in pressure.

2) The oil pump driven gear shaft came loose and started to slip. I've never 
seen this happen, but I've heard that it's a possibility. It's just a press fit and I 
can imagine that slipping would rather quickly cause it to gall and weld itself 
back together.

In your first 10 minutes at 2500 rpm, since you say you have an actual oil 
pressure gauge, what was the oil pressure?

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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