Tech Question for The P-51 Gurus

Jack Cook · **Posted:** Sat Mar 22, 2008 7:16 pm

On some P-51Ds there are 2 stencils on access panels aft of the spinner.
What do they say????
Here's one I can partially read it....................................

Coolant Na____ Inhibited

51fixer · **Posted:** Sat Mar 22, 2008 7:22 pm

Jack Cook wrote:

On some P-51Ds there are 2 stencils on access panels aft of the spinner.
What do they say????
Here's one I can partially read it....................................

Coolant Na____ Inhibited

It is a chemical added to the coolant or a type of coolant.
NAMBT possibly?
Rich

Jack Cook · **Posted:** Sat Mar 22, 2008 7:45 pm

Well cr*p no wonder I couldn't make sense of it.
Do you have any idea what the stencil says on the other panel??
Here it is on Ilfrey's a/c...

Robbie Stuart · **Posted:** Sat Mar 22, 2008 7:47 pm

I believe "NaMBT" was a coolant additive that was developed specifically for the Merlin to counteract the dissimilar crossive effects that the Merlin had with the copper & light alloy aluminum parts used in construction of the engine. This is a common day problem that will haunt a Merlin that is not operated on a regular basis. Some guys use a over the counter product (Automotive) that just does not do the job. :shock:

Robbie

51fixer · **Posted:** Sat Mar 22, 2008 8:11 pm

There is a std stencil for the small panel that is open. The small round opening inside is where you add the coolant to the main coolant system.
Rich

Jack Cook · **Posted:** Sat Mar 22, 2008 8:12 pm

and it said............................. :?:

51fixer · **Posted:** Sat Mar 22, 2008 8:18 pm

Jack Cook wrote:

and it said............................. :?:

I have the blue print for P-51D stencils hanging in our lobby. I am at home. I believe it states coolant spec and quantity.
Rich

Jack Cook · **Posted:** Sat Mar 22, 2008 8:31 pm

You're close to that pony Rich!!

Robbie Stuart · **Posted:** Sat Mar 22, 2008 8:34 pm

COOLANT NAMBIT INHIBITED :shock:

Robbie Stuart · **Posted:** Sat Mar 22, 2008 8:35 pm

Jack Cook wrote:

You're close to that pony Rich!!

Rich, Jack ain't got no stinkin ponies!! :evil:

Robbie

Jack Cook · **Posted:** Sat Mar 22, 2008 8:59 pm

OK-OK so it's actually a large angry lizard :roll:

Do the 2 white marks have any significance??

JohnTerrell · **Posted:** Sat Mar 22, 2008 9:11 pm

On the panel not shown in the first shot, the only stencil I have seen on it reads:

Coolant
Filler
Filler Instructions Inside

This looks to be a bit different however.

Robbie Stuart · **Posted:** Sat Mar 22, 2008 9:12 pm

Jack Cook wrote:

OK-OK so it's actually a large angry lizard :roll:

Do the 2 white marks have any significance??

No those are on the prop spinner.

Jack Cook · **Posted:** Sat Mar 22, 2008 9:16 pm

Has opposed to be on the lizard :shock:

51fixer · **Posted:** Sat Mar 22, 2008 9:17 pm

Jack Cook wrote:

OK-OK so it's actually a large angry lizard :roll:

Do the 2 white marks have any significance??

Might index the aft spinner to the #1 prop blade.
Also there were marks on some spinners and prop blades to aid in sighting the gun camera. There was a mark on the center lower carb intake. Align with the mark on the spinner. One mark allows you to sight gun camera on a distant ground target. The other spinner mark aligns a prop blade. On the back of the prop blade was a series of range marks that could be used to sight the gun camera as well IIRC.

Rich

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