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Message started by juang on 11/04/09 at 09:50:38

Title: Transmission Oil Change
Post by juang on 11/04/09 at 09:50:38

Thanks to you guys, I know how to change the engine oil in my Savage. But I was wondering if anyone knows how to change the transmission oil too.

I talked to a guy who used to work on motorcycles in Mexico, he said you don't need to do that. He said that as long as you change the engine oil, you should be fine. I don't know what to think now. That's why I decided to come to the experts. Thanks.

Title: Re: Transmission Oil Change
Post by bill67 on 11/04/09 at 09:54:36

When you change your engine oil you are also changing the transmission oil,Its all together.

Title: Re: Transmission Oil Change
Post by Serowbot on 11/04/09 at 09:54:54

The engine oil, is the transmission oil... ;)

Title: Re: Transmission Oil Change
Post by Charon on 11/04/09 at 09:55:22

On the Savage, the engine oil IS the transmission oil.

Title: Re: Transmission Oil Change
Post by bill67 on 11/04/09 at 10:02:12

That why you need to use a good motorcycle oil.

Title: Re: Transmission Oil Change
Post by Routy on 11/04/09 at 10:11:41

And that tells us that transmissions don't need transmission oil,......that 30 wt motor oil works perfectly fine in transmissions too. But those of us that worked in the the transmission/gear box industry already knew that. And thats why the oil threads that are so serious to some, are so humourous to most of us. :-?

Title: Re: Transmission Oil Change
Post by justin_o_guy2 on 11/04/09 at 10:40:41

Modern F-150's use a 5 wt oil in the manual 5 speed trannys. But they still use the heavy stuff in the pumpkin.

Title: Re: Transmission Oil Change
Post by jabman on 11/04/09 at 14:05:44

2 stroke bikes need to have there transmission oil changed, as the engine oil is in the fuel/or injected

Title: Re: Transmission Oil Change
Post by Charon on 11/04/09 at 14:17:04

There are actually quite a few motorcycles with separate engine and transmission lubrication systems. Old British bikes had separate units, and I believe the current Harleys are also separate.

Way back around 1960, if the stories are true, the British Mini was designed with a common oil system for the engine and transmission. The only required change to the transmission was replacing bronze synchronizer parts with steel ones. Few motorcycles have synchronizers in their transmissions.

In the middle '70s, in response to one or another fuel crisis, the Army changed out the heavier oil in truck transmissions to use engine oil. It's been a long time, but I think they changed from SAE 50 in the transmissions to SAE 30. The change was said to have no deleterious effect, and to improve fuel mileage by a small amount.

Title: Re: Transmission Oil Change
Post by Routy on 11/04/09 at 16:12:54

Back in the 60s, in the summer we had hi speed gear boxes on new harvesting equipment running so hot the 90 wt gear oil was smoking out the vents. The warranty fix was to drain the 80-90 wt, then install 30 wt motor oil. The boxes never smoked again, the fix was made permanent by the gear MFG, and the oil spec sheets were changed to 30 wt.

But yet, most gear boxes still run 80-90 wt oil ::)

Title: Re: Transmission Oil Change
Post by juang on 11/04/09 at 21:37:51

thank you guys. I love you all, but in a manly way, of course.

Title: Re: Transmission Oil Change
Post by mpescatori on 11/05/09 at 07:31:38

705B52415C5D330 wrote:

Originally, all motorcraft, be they 2, 3, 4 wheelers, had gearboxes separate from the engine.
So engine oil was separate from gearbox oil.

The story about the Austin Mini is correct.
Whereas the Austin Minor had a 4 cylinder engine mated to a traditional gearbox and rear wheel drive (so engine and g/box would be separate)
the extremely tight space available within the Mini's engine bay was such that the solution was to fit the engine transversely, and design a special gearbox that was integral to the oil pan (sump in English)
Thus, the first truly front wheel drive, transverse engine system was born.
Competitor marques (such as Renault) insisted on a longitudinal engine and a transverse gearbox... definitely a more primitive design.

Motorcycle gearboxes, unlike automobile gearboxes, have sequential gear changing; you must go through all the gears whether going up or down.
Cars & Trucks have the typical "H" layout which allows to shift 5th-3rd, or 4th-2nd... not possible with a sequential system.

Most motorcycles today have a wet clutch, so "engine oil = gearbox oil" is the paradigm.
Ducatis, Guzzis, BMWs, even Harleys have a dry clutch so you will have separate engine and gearbox oils.

I have never considered a 30w oil in a gearbox; both my truck's instruction booklet, and that in my wife's car insist on 80/90 oil.
It is unlikely that I may come across any 30w oil, but a cheap 15/40 could be an interestnig idea...

8-)

Title: Re: Transmission Oil Change
Post by bill67 on 11/05/09 at 08:25:21

Simple solution use what the manufacture says.After all they probability know more than anyone on this forum.

Title: Re: Transmission Oil Change
Post by Yonuh Adisi on 11/05/09 at 13:56:07

6B6065653F3E090 wrote:

Simple solution use what the manufacture says.After all they probability know more than anyone on this forum.

That the same manufacturer that made it near impossible to get at the spark plug unless you remove the fuel tank?

Title: Re: Transmission Oil Change
Post by RidgeRunner13 on 11/05/09 at 14:15:03

The same manufacturer who designed a cam chain tensioner that can fall apart & cause catastrophic engine failure? :'(

Title: Re: Transmission Oil Change
Post by bill67 on 11/05/09 at 14:42:44

Boys we are talking about gearbox oil.Now pay attention or go sit in the corner.

Title: Re: Transmission Oil Change
Post by BurnPgh on 11/06/09 at 01:45:36

harsh

Title: Re: Transmission Oil Change
Post by Routy on 11/06/09 at 04:33:48

That same kinda MFGs that can't make up their minds about taking caps off batteries while charging ?
Or to do something, untill the factory bulletin comes out telling you not to ?

Title: Re: Transmission Oil Change
Post by bill67 on 11/06/09 at 05:05:19

Car companies tell you what weight to use in their gear boxes,Why would you use a differenced weight.I guess because the companies have no idea what weight should be used.

Title: Re: Transmission Oil Change
Post by justin_o_guy2 on 11/06/09 at 10:36:58

I wonder what changes in internal materials/machining processes, etc, were made in the Ford transmissions that were filled with 80/90 wt. oil for decades that are now running on 5 weight. If there are no engineering changes internally that Allow the lower weight oil, then the previously dictated oil was wasteful of millions of gallons of gasoline. How many manufacturers recommend an oil in a given application because it has become "industry Standard"? How much unwillingness to change is out of fear of public perception?
Given the clearly demonstrated failures in this post of manufacturers to be always correct in other areas, it would seem a bit odd to just say "Well, sure, theyve made mistakes but when it comes to deciding which weight oil to use, they know what theyre doing".

Title: Re: Transmission Oil Change
Post by bill67 on 11/06/09 at 10:42:06

Could be better metal or closer clearance.

Title: Re: Transmission Oil Change
Post by justin_o_guy2 on 11/06/09 at 10:52:45

Every report Ive read about why engines are not worn out at 100,000 miles now is almost all due to improved lubricants. Some minor improvements in metallurgy, but the overwhelming majority is attributed to the improvements in oil. Maybe todays 5wt is simply good enough to handle what used to require an 80 wt?