Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Mx5 Gearbox Oil Level

Well, eventually got around to jacking up the plus4. So jacked up the passenger side and removed the filler plug, recall I'd already topped up the 'box to a level with the box horizontal. I gently lowered the jacks until oil just started to appear at the fill hole and rechecked the box was level with spirit level, I stopped the lowering.
Taking a measurement from the outer edge of the main forward to aft chassis member with car jacked up indicted that the height to the garage floor was 345mm. As mentioned my car is on 15" wheels and 65 profile tyres.
As a final note, the car's done some 24k with the oil level at "10 degree tilt level" and I can't detect any adverse performance issues in terms of smoothness of gear change or any mechanical vibration or noise due to operating at thjs level.

Must admit to being rather bemused by this thread. Many years ago we (Volvo Dealer Training in Daventry) had a gearbox on the back of one our running engine training rigs. It had a Perspex panel on one side to show the operation of the box under running conditions. The amount of oil ‘throw’ always amazed delegates so I am struggling to see how a minimal reduction in oil level can affect shift quality? What on Earth happens during cornering or under braking? Once even gear oil gets hot it soon thins a bit and sloshes (technical term ;-)) all over the place.

BR
Colin

Many thanks Lowflyer for following up on my request. Following all the debate on this though, I am now inclined to concur with Spanner Juggler’s remarks above, and would not be surprised if most Morgan workshop technicians agreed.

Exactly, pretty much summed up by my last sentence, but having the correct level won't do any harm me thinks