[MRCA] PU-181 Generator Fuel/Lube

[WA5CAB at cs.com]

Tim,

The only two revisions to TM 11-943 I am aware of are Change 1 and Change 
2.  Change 1 adds a parts list.  Change 2 adds PU-181A/PGC-1 (Engine 
GE-12-G).  It also adds a Lube Order which says to use 1/2 Pint of OE-10 (SAE 10) 
per gallon.  Which is 16:1.  It does not mention SAE-30.  

However, as any vintage lathe or milling machine owner has learned, you are 
going to have a hard time finding non-detergent SAE 10 today.  Except in 
the very small 3-In-1 cans, which would be very expensive.  Your choices will 
be SAE 20 (still available last year but who knows for how much longer) or 
buy it as ISO 62 or so spindle oil (or a few other names) from a machine shop 
supply house.  Don't use any of today's high faluten high detergent 
multi-grade engine oils.  Or you might try places that sell chain saws.  I don't 
know what they use but it's work checking.  The Mobile spindle oil is about 
$23/gallon, plus shipping from Enco.  I buy it for my Atlas lathe and mill but 
it looks like a gallon is going to last three or four years.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 04/14/2014 14:45:04 PM Central Daylight Time, 
timsamm at gmail.com writes: 
> OK Wise Guys - here's a question for you regarding engine oil and 
> concentration.
> 
> 
> The PU-181/PGC-1 is a 2-stroke gas generator rated at 300W, 240/120 VAC.  
> It uses a Jacobsen GE-12F engine.  The generator is designed for the PGC-1 
> TTY terminal but also for general purpose use.  It has a completely 
> shielded ignition system - it is radio friendly. This same engine is also used to 
> power the GRC-9 DC generator adaptation.
> 
> 
> The placard on the fuel tank advises a 16:1 fuel-oil ratio.  It states to 
> use SAE 10 weight below 32 degrees F and SAE 30 for operation above 32 
> degrees F.
> 
> 
> However, the Tech Manual TM11-943 "Engine Generator PU-181/PGC-1" (US Army 
> 1951) states to use a 32:1 fuel-oil ratio and it says to use SAE 10 lube 
> oil, it says nothing about SAE 30 or temperature.
> 
> 
> So regarding mix ratio, which is it?  I don't know if there were any 
> post-1951 tech advisories that addresses this apparent discrepancy.
> 
> 
> Comments?  Thanks
> Tim
> N6CC
> 
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