| [GMCnet] Re: What model Onan was the 4.0 for the GMC ? [message #367676 is a reply to message #367672] |
Mon, 22 November 2021 17:58   |
James Hupy
Messages: 6806
Registered: May 2010
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Senior Member |
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There is one important difference between the BF for tractors and the BF
used in power generators and welders. The governor on the end of the
camshaft for tractors has 5 balls for speed control. Generators and welders
have 10. That makes them much more stable at speed control, which controls
both voltage and frequency an the AC units. Also applies to the NH engines
which are Cast Iron.
Jim Hupy
Salem, Oregon
On Mon, Nov 22, 2021, 11:06 AM Matt Colie wrote:
> hertfordnc wrote on Mon, 22 November 2021 13:49
>> That describes most Onans of all different sizes.
>> But I'm just exploring some optins.
>> I have a good working BF which i can make fit into my generator space
> with a bit of persuasion.
>> But if the BF is the base of the 4000 power drawer then i wonder if i
> could swap the externals?
>
> Dave,
> As I understand from doing parts hunting years ago, the engine designation
> of BF is for all of those engines of that design. As long as it is a BF,
> it is the same as every other BF except for some external dress. Three
> things that I do know are special about the PDs are:
> 1- They draw the cooling air over the engine instead of blow.
> 2- They are set up for fuel pump and not gravity feed.
> 3- They have a control board with safeties to enable remote operation.
>
> So, I bet if you can find a Power Drawer with a bad engine, you could swap
> yours in there.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
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