What oil in SE5a 3 rod gearbox - alternative to SAE80?

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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by ScimmyMike » Fri Feb 08, 2019 12:11 am

Oldconn wrote:
Thu Feb 07, 2019 3:40 pm
I've just bought some 5ltr cans of MILLERS from their on-line shop. GL4 of course, for the gearbox; and 20W50 with high zinc content for the engine.
Presume you made use of the RSSOC members discount?


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by ScimmyMike » Fri Feb 08, 2019 12:13 am

scimjim wrote:
Thu Feb 07, 2019 8:27 pm
I think using engine oil has been discussed previously - was it an MG thing in earlier overdrives?
10/40 is specified for my SAAB 900's box and they as we know are capable on many hundreds of thousands of miles so can't be all that bad can it


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by Roger Pennington » Fri Feb 08, 2019 12:18 am

I'm sure it's excellent stuff in applications for which it's specified - doesn't mean I'd want to use it in ones where it isn't specified though?


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by Oldconn » Fri Feb 08, 2019 7:10 am

ScimmyMike wrote:
Fri Feb 08, 2019 12:11 am
Oldconn wrote:
Thu Feb 07, 2019 3:40 pm
I've just bought some 5ltr cans of MILLERS from their on-line shop. GL4 of course, for the gearbox; and 20W50 with high zinc content for the engine.
Presume you made use of the RSSOC members discount?
Actually I took advantage of the short-term special discount they offered on the French website - I didn't think to use my members' discount, but thanks for reminding me!


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by Dennis Nicholas » Fri Feb 08, 2019 11:38 am

philhoward wrote:
Thu Feb 07, 2019 8:30 pm
MGs used engine oil in their overdrive boxes. I’m not convinced that the overdrive will be totally happy with 20/50 - pressure settings seem to be different for one running 20/50 and one running EP80 based on the little bit of info I could find when looking at the LH overdrive when used in a BGTV8
Spot on P
The J type Laycock overdrive (on 6a +...not sure what type on 5/5a) has pump and pressure relief valves in its workings and hence sensitive to oil viscosity. Setting up can involve using a pressure gauge. Hence my comment that it is worth reading how the O/D works. Lubrication of the metal bits is only part of the story. www.buckeyetriumphs.org/technical/jod/JOD2/JOD2 is a good start for reading. TR6 among others used J type...useful for spares...Moss, Rimmer Bros etc.
Obviously Supplement to Workshop Manual (part No. 92139) Section G Gearbox (including overdrive) can be read with the main workshop manual.
The LH overdrive is obviously a bit different.

Dennis


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by AJL Electronics » Fri Feb 08, 2019 12:08 pm

philhoward wrote:
Thu Feb 07, 2019 8:30 pm
MGs used engine oil in their overdrive boxes. I’m not convinced that the overdrive will be totally happy with 20/50 - pressure settings seem to be different for one running 20/50 and one running EP80 based on the little bit of info I could find when looking at the LH overdrive when used in a BGTV8
Quite. The EP stands for Extreme Pressure, to suit the gears meshing which 20W50 is not. EP80/90 is what I use in customers' cars, without issue.


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by Jpwill7675 » Mon Feb 11, 2019 11:20 am

Does anyone have the correct torque setting for the gearbox side cover? Also should I use any hylomar- type liquid gasket in addition to the new gasket. I could find any reference in the workshop manual. Thanks for your advice. Regards, Jim


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by Old and Slow » Mon Feb 11, 2019 11:24 am

Sorry to digress in the thread, but...
I understood that RTV forms a better seal and stays "rubbery" making it easier to break the joint next time you dismantle.
I'd appreciate feedback from forum members on this as I want to use RTV next time.


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What oil in SE5a 3 rod gearbox - alternative to SAE80?

Post by AJL Electronics » Mon Feb 11, 2019 11:54 am

Old and Slow wrote:
Mon Feb 11, 2019 11:24 am
Sorry to digress in the thread, but...
I understood that RTV forms a better seal and stays "rubbery" making it easier to break the joint next time you dismantle.
I'd appreciate feedback from forum members on this as I want to use RTV next time.
It also squishes out, potentially leaving stray bits to float around the engine. Hylomar is where it's at, for me.


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