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MGA rear gear box seal leaking

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MGA rear gear box seal leaking #1
Drew1957 Stephen S Caledon, ON, Canada Sign in to contact	Topic Creator (OP) Aug 28, 2015 12:42 PM Joined 9 years ago 34 Posts

I have a 57 MGA that is leaking transmission fluid I believe from the rear seal. The oil seems to be settling about halfway back under the car. I took into a shop and they felt it was the rear seal. My quesiton is, how big of a deal is it to repair this?

Thanks,

Drew

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Re: MGA rear gear box seal leaking #2
ghnl Eric Russell Mebane, NC, USA Sign in to contact 1961 MG MGA "Calvin"	Aug 28, 2015 02:58 PM Top Contributor Joined 12 years ago 12,756 Posts

The MGA Guru describes the procedure. See: Gearbox Tech, specifically, Replacing Rear Seal

Eric Russell ~ Mebane, NC
1961 MGA #61, 1981 Alfa Romeo GTV6, 1984 Alfa Romeo Spider, 1991 Honda ST1100

Edited 1 time(s). Last edit at 2015-08-28 03:00 PM by ghnl.

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Re: MGA rear gear box seal leaking #3
Blueosprey90 Jeff Sienkiewicz New Milford, CT, USA Sign in to contact 1957 Volvo PV444 1959 MG MGA 2004 Honda S2000	Aug 28, 2015 03:23 PM Top Contributor Joined 14 years ago 5,148 Posts

I have the mid 1500 transmission. I've never done it, but for my transmission the procedure would be

Put the car up high on jack stands.
Shake the car it like hell to verify that it won't move.
crawl under and drain the oil from the transmission.
with two 1/2 inch wrenches or thin 1/2" sockets, remove the 4 flange bolts holding the driveshaft to the differential, and separate by dropping.
pull the driveshaft towards the rear of the car. The driveshaft will slide off of the tail housing of the transmission. Have a rag to wipe any leaking oil.
dig out the old seal and install the new. But be careful digging out as there is a brass bushing behind the seal that you don't want to hurt.

Should take you about an hour to remove. another to reinstall the driveshaft.

See posts 7 & 8 here.

http://www.mgexp.com/phorum/read.php?2,2952785,2952785#msg-2952785

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Re: MGA rear gear box seal leaking #4
cpjim jim patterson IN, USA Sign in to contact	Aug 28, 2015 04:18 PM Joined 13 years ago 146 Posts

make sure the breather is not plugged up.

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Re: MGA rear gear box seal leaking #5
ghnl Eric Russell Mebane, NC, USA Sign in to contact 1961 MG MGA "Calvin"	Aug 28, 2015 07:38 PM Top Contributor Joined 12 years ago 12,756 Posts

In reply to # 3071952 by cpjim make sure the breather is not plugged up.

Good suggestion.

In reply to # 3071921 by Blueosprey90 Put the car up high on jack stands.

What are these things called 'jack stands'? Do they have a button to press and raise the car up?

Eric Russell ~ Mebane, NC
1961 MGA #61, 1981 Alfa Romeo GTV6, 1984 Alfa Romeo Spider, 1991 Honda ST1100

Roundel 01.jpg 27.9 KB

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Re: MGA rear gear box seal leaking #6
Drew1957 Stephen S Caledon, ON, Canada Sign in to contact	Topic Creator (OP) Sep 1, 2015 03:18 PM Joined 9 years ago 34 Posts

Where would I find this breather you are referring to?

Thanks

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Re: MGA rear gear box seal leaking #7
Gary E Gary Edwards Kernersville, NC, USA Sign in to contact 1962 MG MGA MkII	Sep 1, 2015 03:37 PM Top Contributor Joined 17 years ago 16,300 Posts

It is on top of the transmission close to the dipstick.. You can only get to it if you remove the top of the tunnel and the shift tower and then reach your hand way back in the hole.

Gary

Murphy's law

Tell a man there are 300 billion stars in the universe, and he'll believe you. Tell him a bench has wet paint on it, and he'll have to touch it to be sure.

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