MR2 Roadster Owners Club

The Workshop => Maintenance, Problems & Troubleshooting => Topic started by: JohnGee on May 26, 2022, 06:33

Title: Gearbox Oil Level
Post by: JohnGee on May 26, 2022, 06:33
Was checking my gearbox oil level last night. Released the 10mm hex on the LHS of the image (in the white square), oil dripped out pretty freely. Released the 17mm bolt on the RHS (white circle) and no oil escaped. If I popped my finger in the bolt hole then there was a bit of oil on it when I withdrew it. Is this normal? Should there have been more evidence of gearbox oil presence from the bolt hole? The RHS bolt hole seems to be the slightly higher of the pair, is the level on the RHS down simply because of regular checks on the LHS with a bit of oil loss each time?

(https://live.staticflickr.com/65535/52100187049_d8f1aa76a4_b.jpg) (https://flic.kr/p/2nnV5t4)
Title: Re: Gearbox Oil Level
Post by: Joesson on May 26, 2022, 08:45
@JohnGee

A picture says a thousand words and in this case it told me that's not like what I remember on my car.
Have a look here:
https://www.mr2roc.org/forum/index.php?topic=62272.0
Where the honourable @shnazzle has written chapter and verse about draining and refilling the gear box on a 5 speed ( lightweight super speed model) and the 6 speed ( heavy weight cruiser).
You will see the plug accessed with an Allen key is the one for your 6 speed.
He does advocate filling via that orifice, not the redundant speedo drive aperture readily visible from above.
You have already checked the most important part, check that you can put oil in before you take it out!
PS. Best to use a hose that is NOT a tight fit in the filler hole as air must be expelled as you refill  with oil,,similarly leave the oil FILL plug off while draining to allow air pressure to help expel the oil.
Title: Re: Gearbox Oil Level
Post by: JohnGee on May 26, 2022, 12:47
Quote from: Joesson on May 26, 2022, 08:45@JohnGee

A picture says a thousand words and in this case it told me that's not like what I remember on my car.
Have a look here:
https://www.mr2roc.org/forum/index.php?topic=62272.0
Where the honourable @shnazzle has written chapter and verse about draining and refilling the gear box on a 5 speed ( lightweight super speed model) and the 6 speed ( heavy weight cruiser).
You will see the plug accessed with an Allen key is the one for your 6 speed.
He does advocate filling via that orifice, not the redundant speedo drive aperture readily visible from above.
You have already checked the most important part, check that you can put oil in before you take it out!
PS. Best to use a hose that is NOT a tight fit in the filler hole as air must be expelled as you refill  with oil,,similarly leave the oil FILL plug off while draining to allow air pressure to help expel the oil.

Thanks, Tony. I was wanting to simply check my gearbox oil level rather than drain and refill and I think that oil dribbling out of the LHS hole means it's at the correct level. Not entirely sure what the RHS access point is for. I was doing this at college last night, tutor suggested that the RHS is access to a chamber that houses top gear and reverse, whilst the the LHS is for first gear through to next to top. Since it seems that the RHS hole is slightly higher than the LHS, perhaps the level on the RHS drops slightly with each and every check and slight loss of fluid on the LHS.

I had seen the @shnazzle article a few weeks ago, all a bit easier to understand now that I've carried out some initial investigations. If he refills through the LHS hole then clearly slight loss from this side indicates a gearbox suitably filled with oil.
 
Title: Re: Gearbox Oil Level
Post by: Joesson on May 26, 2022, 14:59
Quote from: JohnGee on May 26, 2022, 12:47Thanks, Tony. I was wanting to simply check my gearbox oil level rather than drain and refill and I think that oil dribbling out of the LHS hole means it's at the correct level. Not entirely sure what the RHS access point is for. I was doing this at college last night, tutor suggested that the RHS is access to a chamber that houses top gear and reverse, whilst the the LHS is for first gear through to next to top. Since it seems that the RHS hole is slightly higher than the LHS, perhaps the level on the RHS drops slightly with each and every check and slight loss of fluid on the LHS.

I had seen the @shnazzle article a few weeks ago, all a bit easier to understand now that I've carried out some initial investigations. If he refills through the LHS hole then clearly slight loss from this side indicates a gearbox suitably filled with oil.
 

I suggest the gear box casing is the same for 5 and 6 speed boxes / other cars and one or other "plug" is redundant for the different 5/6 speed box / other car. Similarly the superfluous speedometer drive on the top of the box.

iirc the LH plug accessed by an Allen key, leads to nothing on my 5 speed whereas the RH hex head is the filling orifice for my 5 speed.