• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Spitfire Changing Differential oil

number6

Jedi Trainee
Offline
Recently replaced differential and according to Quantum Mechanics who rebuilt it I should change the oil.
Question is how to do this as it has no drain plug. So I imagine I need to suck it out from the fill hole. Any thoughts on best way to do it?
 

Alfred E. Neuman

Jedi Trainee
Offline
A Mightyvac extractor works great for such things. Use mine at least 4 times a day.

MITMV7400.JPG
 

Geo Hahn

Yoda
Country flag
Offline
Clever of STC (or was it BL?) to save 50d by eliminating the drain plug.

Your immediate alternative to sucking it out is to remove the diff cover. Long term - some drill and tap to accept a drain plug.
 

poolboy

Yoda
Country flag
Offline
You'll find inexpensive hand pumps pretty near the gear oil display in auto parts stores.

You can use the same one to put fresh oil back in.
 

TR3driver

Great Pumpkin - R.I.P
Offline
wfFGGqD.jpg
 

Sarastro

Obi Wan
Gold
Country flag
Offline
The shop manual says that the differential originally was filled with an oil that never needs replacement, and shouldn't be replaced, just topped up occasionally. I don't think they were figuring on the car being in use fifty years later, though.

Are they saying that you should change the oil after a short, break-in distance? I dunno if that is necessary; I can't think of why it would be.
 

Alfred E. Neuman

Jedi Trainee
Offline
Are they saying that you should change the oil after a short, break-in distance? I dunno if that is necessary; I can't think of why it would be.
It's probably not *needed* as I've never heard of a break-in service on any differential in a new car or truck I've worked on, but I think it's a probably a good idea on a rebuilt 50+ year old unit. You get some immediate feedback on how the new parts are wearing-in together via any particles in the oil, and if nothing else it gets the small bit of wear-in metal out of the diff.
I'd do the same on any old transmission I rebuilt. And I definitely do an oil change after the cam break-in on any engine I've put together.
Being able to see the lubricant is also one of the reasons I've kept the original canister filters on my TR2/3/6 engines (when I actually had an LBC :frown-new: ). I can get a good look at what the filter is pulling out of the oil.
 
OP
N

number6

Jedi Trainee
Offline
Well I also thought it was filled for life but John at Quantum mechanics said I should change it. so I will just to be on the safe side.
I want to thank everyone for their suggestions and help.
Tom S
 

TR3driver

Great Pumpkin - R.I.P
Offline
Always the question with anything "for life" ... Whose life? Often it's only the life of the warranty.

But I've wondered sometimes if they didn't bump into the same problem we have today, with some gear oils not being good for the thrust washers and so on.
 

TomMull

Luke Skywalker
Bronze
Country flag
Offline
Good way to get rid of any swarf, gasket goo or other contaminants that may have contaminated the case during rebuild. As long as you use the correct oil, changing it will certainly not do any harm.
Tom
 

Andrew Mace

Moderator
Staff member
Country flag
Offline
Clever of STC (or was it BL?) to save 50d by eliminating the drain plug.

Your immediate alternative to sucking it out is to remove the diff cover. Long term - some drill and tap to accept a drain plug.

Unfortunately, there's no "cover" per se on a Spitfire differential. :( And good, bad or otherwise, Standard-Triumph eliminated that drain plug around 1963 or so. Sure, it can't hurt to drill and tap the case for the same plug as used to fill. Of course, you will lose about 1/2" ground clearance, but I don't think that's a major factor.

This is a tiny image but does show where that plug once was:

diff.gif
 

SASSAMON

Senior Member
Offline
When I refurbed my running gear, I replaced the drain plugs with hex drive plugs with magnetic inserts.

Purchased them from Pegasus Racing part number 1012.

The hex drive is built into the body of the plug providing a lower profile than the original plugs and the hex drive I fill with a bit of grease to keep road dirt from plugging the hole.

The hex drive is less likely to round out when removing the plug.
 

TR3driver

Great Pumpkin - R.I.P
Offline

TomMull

Luke Skywalker
Bronze
Country flag
Offline
I suppose one gets used to simply pulling a plug to drain the oil but it is really no trouble to suck it out with a vacuum or a pump and it's actually a bit tidier. I've been doing it on inboard boats, which rarely have any access to the drain plugs, for 50 years.
Tom
 

Alfred E. Neuman

Jedi Trainee
Offline
I suppose one gets used to simply pulling a plug to drain the oil but it is really no trouble to suck it out with a vacuum or a pump and it's actually a bit tidier. I've been doing it on inboard boats, which rarely have any access to the drain plugs, for 50 years.
Tom
It's SOP for some of the new Mercedes engines. The sump is plastic, with a big plastic drain sealed with an o-ring that you need a special socket to remove. Work instructions for basic service is to suck the the oil out the dipstick tube. Drain plug only comes out if you need to access the bottom end for some reason. My guess is this is to keep techs who don't use torque wrenches from stripping the plastic plug.
 
Similar threads
Thread starter Title Forum Replies Date
R TR2/3/3A Changing to a voltmeter. Triumph 6
red57 changing lock barrels Austin Healey 7
FlyingCat Spitfire Checking/Changing Fluids Triumph 5
jfarris TR2/3/3A Changing rear wheel studs in a later Girling axle Triumph 3
R TR2/3/3A Changing rear seal Triumph 23
C changing ignition light bayonette Austin Healey 2
J Changing Brake Discs on my 63 BJ7 Austin Healey 9
R Rear quarter elliptical suspension changing Spridgets 12
F Changing fuel Austin Healey 6
drooartz MGB Changing clutch hose - tips? MG 13
T ?Changing BE to SU electric fuel pump Spridgets 8
J TR2/3/3A Changing fan belt. Triumph 9
A TR4/4A Changing rear diff seals Triumph 15
R TR4/4A Changing from 4 speed to Overdrive on a TR4 Triumph 18
D TR2/3/3A Changing polarity on TR 3 Triumph 9
O TR2/3/3A Changing Ignition Switches Triumph 5
B Spitfire Changing leaf spring bushing - any tips? Triumph 6
Z TR6 74 TR6 - Changing headlight beam switch issue Triumph 0
M Changing coolant Triumph 14
P Changing Brake Fluid & Brake Pressure Switch Austin Healey 17
bobh Changing Transmission Oil in 10 minutes Triumph 8
P CHANGING TO FRONT DISCs Spridgets 22
Reh Changing things up Triumph 13
af3683 Changing tires on Original TR 3 Wire Wheels Triumph 4
tweety Changing a half axle Spridgets 1
58Custom Any tricks to changing front wheel bearings? Spridgets 7
Stewart Changing crossmember pads MG 2
P Changing the Oil on a 100-4 Austin Healey 81
TRnorwegian Changing clutch master cylinder - peace of cake? Triumph 10
M Brakes are terrible. Any tips on changing calliper Spridgets 14
theleisure Changing Out Front Bushings Spridgets 5
R Changing Motor Mounts Triumph 6
BritcarsUSA Changing 5/8 to 3/4 Midget filter adapter nipple? Spridgets 4
rchakr Changing Rear Springs Triumph 6
beaulieu changing an old car to E85 Restoration & Tools 14
T Changing fluids Triumph 16
G Changing bearings Triumph 7
B Changing to Silicone Brake Fluid Spridgets 18
G Changing Horses in Mid Stream.... Triumph 47
Paulus TR6 Changing a TR4A fan to a TR6 fan Triumph 3
T Changing front bolt pattern? Triumph 9
19_again changing right angle drives MG 1
G Changing my Sway Bar Triumph 11
S Fuel Pump, changing ground Spridgets 3
vping Changing from 2 batteries to 1 battery - Why? MG 28
davidk TR6 Changing TR-6 Fan Belt - Need Help! Triumph 11
B Changing to Neg Ground - Fuel Pump? Austin Healey 26
G Changing front oil seal on transmission. Triumph 14
kyreb1862 Changing Out Mounts MG 4
G Changing VINs Triumph 18

Similar threads

Top