OF SOUTH AUSTRALIA INC |
Gearbox Oil (3) |
OF SOUTH AUSTRALIA INC |
From: | Laurence McCracken [lmccrack(at)bigpond.net.au] |
Sent: | Monday, May 29, 2006 11:22 AM |
To: | HillmanCars@yahoogroups.com |
Subject: | [HillmanCars] Gearbox oil |
Laurie
From: | Jan Eyerman [jan.eyerman(at)usa.net] |
Sent: | Monday, May 29, 2006 12:20 PM |
To: | HillmanCars@yahoogroups.com |
Subject: | Re: [HillmanCars] Gearbox oil |
Solution? Use straight 20 weight or 30 weight engine oil. This should not upset you as automatic transmissions use very thin oil and Chrysler Valiants with manual transmissions use automatic transmission fluid (which is even thinner than engine oil).
Soooo, keep your Hillman happy with a diet of engine oil (20 or 30 weight) in the transmission. There are at least 100 cars on the list running with it now and I have been doing it since 1955!!! I have only had one manual transmission failure (out of 100+ Rootes cars) - and that was due to all of the oil leaking out.
Jan Eyerman
From: | Armadillo Technical Services [1dillo(at)bellsouth.net] |
Sent: | Monday, May 29, 2006 12:23 PM |
To: | HillmanCars@yahoogroups.com |
Subject: | Re: [HillmanCars] Gearbox oil |
Here is the straight dope. This is the text of a message from December 2, 2002.
" The reason 90 wt is bad for a standard gearbox is because unlike
American transmissions that have 1/4" or larger holes in the gears for
oil passages, Rootes used tiny holes. Consequently, a thick as molasses
oil does not 'even' pass thru the holes at low temperatures and transmissions literally run dry.
Laycock Overdrives are designed with controlled orifices as
well: 30 wt passes thru them and 90 wt WHEN HOT will too. However,
there is a pump: again, it is designed to pump 30 wt oil when cold and
hot, and not a thick differential gear lube, especially when it is cold.
I have seen both standard and overdrive transmissions that have
run literally forever using both a light engine oil and a gear lube. I
have also seen several transmissions that failed in service with blued
parts from overheating, and they were full to the top with 90 weight
goo. I have never seen a failure caused by using the correct lube.
30wt. Non-D works for me...
Jim Leach Pacific Tiger Club Seattle
Martin DeWitt
1dillo@bellsouth.net
1960 Minx IIIA Deluxe Convertible
1962 Minx IIIC Deluxe
From: | Laurie [lmccrack(at)bigpond.net.au] |
Sent: | Monday, May 29, 2006 4:32 PM |
To: | HillmanCars@yahoogroups.com |
Subject: | Re: [HillmanCars] Gearbox oil |
From: | Graham Robinson [grhusky(at)optusnet.com.au] |
Sent: | Monday, May 29, 2006 5:37 PM |
To: | HillmanCars@yahoogroups.com |
Subject: | Re: [HillmanCars] Gearbox oil |
From: | Tigerootes(at)aol.com |
Sent: | Tuesday, May 30, 2006 2:03 AM |
To: | HillmanCars@yahoogroups.com |
Subject: | [HillmanCars] Re: Gearbox oil |