[Vwdiesel] Risks of Hydraulic Heating?

[Svend M Kjong]

Val Christian and ALL :      Simple answer IMHO is that there is NO risk in your case.

But ?  if you explain risk ---in more details ? --- --I will give my two Kanadien cents
(pennies for Mark Shepherd.)
A VW Injection pump  is a hydraulic pump ? Ja.  an Injector is a relief valve. ? JA .  I
fully agree with all the other threads --except to say that NO energy is stored in
compressed oil  any more than ENERGY stored in water under pressure.

Energy in the oil is miniscule ---related to flow and temperature.  To heat oil in
industrial stuff  on a cool day ? it is standard procedure to say tilt the bucket on a
backhoe and let the flow go by the way of the relief valve back to the main tank. In this
procedure Industry say EROSION or CAVITATION is ignored.

If your relief valve is easy to adjust ---set it to minimum and run engine at high
DLE.  ----OIL heats up real fast ---- 50 HP ?  of friction loss through an orifice ?  lots
and LOTS of heat. --As long as flow is there ?
no risk IMHO.---    BUT IMHO  it is a good idea to stay with machine. If it gets REALLY
cold ?   you being a flyboy ----look up Aviation fluids like Univis.

All the filters I know about have cold day by-pass valves.

Well that was my two Kanadian pennies.

Svend.

PS : for you DIY types ? the cheapest and simplest hydraulic pump is still a big V8
steering pump from the dumpsters.----Yes I have a complete system  done that way ---motor
is a US NAVY   swashplate motor  from a crashed Plane.---all powered by a  110 AC electric
motor --(from a dumpster)  1.5 HP.

This year, I'm considering running the tractor at a moderate power
1800 out of 3000 RPM, and putting the hydraulics into a lock mode, so that
the pressure limiter goes into bypass.  I'm a little concerned about
the effects on the bypass valve (erosion, etc.), and local heating of the
hydraulic oil as it goes through the bypass.  Can anyone comment?

Val