Spitfire Flush Spitfire Differential?

[AustinJim]

Hi all,
I'm swapping the noisy diff in my 78 Spitfire for another used one, hoping to find the 2nd one is less noisy and avoid a rebuild. I'm going to change the oil while I have it out and can completely drain it. I plan on putting Royal Purple Max-Gear synthetic which says it's noncorrosive and good for GL-4 and GL-5 applications. My question is this: is there something I can flush the diff with before I put in the new oil? I'm thinking it might be good to flush out any metal particles while I have the opportunity.

I'd appreciate any advice.

Jim

 

[This14u]

Jim,

I used Marvel Mystery Oil to clean/free up my spit trans that had been sitting for several years. It took a couple days of soaking and turning by hand, but the thing is like butter now. Do your best to get all the MMO out before adding gear oil.

Bob

 

[ken941]

The oil in the differential and transmition stay pretty clean except some metal from normal rear and a vary small amount from the vent unlike the engine that gets most of its contamination from burning fuel. Flushing it with any thing other than oil that is made for it will contaminate with the residual from your flush

 

[AustinJim]

I decided to flush it with the oil I was going to put in it to run. I heated the 75w90 a little in the microwave and flushed the diff twice. I drained it through a paint filter to catch any particles. I think it was worth doing because I got little metal bits both times I did it. The metal was not yellow and so was from the gears and was very small, like dirt particles.
Thanks for the advice!
Jim

 

[angelfj1]

I heated the 75w90 a little in the microwave

:lol: OMG I'm sure she appreciated that!