Friday 24 April 2009
Gearbox oil change - update
What a difference! There was nothing wrong with the old oil but changing to MT90 has resulted in more of a 'flick' to change gear as apposed to a push of the gear lever! If anyone has a doubt abourt changing the oil, my recommendation is to do it sooner than later. You will not regret it! My thanks to RAJ Motors for the use of their hoist and technician in completing the oil change. I had to use a hoist as could not get under the car when on axle stands.
Thursday 23 April 2009
Gearbox Oil change
April 2009 and the time has come for the oil to be changed in the gearbox. (53,200 miles) After reading the forums I decided to use Redline MT90 as the choosen oil - two litres costs £27.56.
The first step will be to warm up the engine's drive train thoroughly - this means you will have to drive the vehicle for at least 20 minutes.
Once you have driven the vehicle enough to warm the transmission to its normal operating temperature, raise the vehicle for ease of access - just be sure to keep it level.
Once the vehicle is raised, crawl under and locate and remove transmission oil fill plug. That's right - the fill plug. You want to ensure that you will be able to fill the transmission once you have drained it, so it is a good idea to make sure you can remove the fill plug before draining the transmission.
To aid you in locating the transmission fill plug, consult your factory workshop manual or look for a bolt on the side of your transmission.
The transmission fill plug on a Mazda MX-5 Miata is a square 14mm bolt - an odd shape, but what Mazda chose none the less.
Next, locate the transmission oil drain plug.
To aid you in locating the transmission drain plug, consult your factory workshop manual or look for a large bolt near the bottom of your transmission.
Once you have located the drain plug, place an oil catch basin beneath the drain plug. As a tip, we use a sheet of vapour barrier underneath the vehicle to localize any oil spills. Also, use newspaper to sop up any drips.
With an adequately sized oil catch basin in place, remove the drain plug and allow the oil to drain completely.
Caution: The transmission oil should (will) be very hot at this point. Keep this in mind when you remove the drain plug bolt.
With the drain plug removed, inspect the top side for large pieces of metal or other debris. Generally, transmissions will see some wear which will be indicated by a fine metallic paste which will be held to the drain plug by the magnet within.
Fine particles are to be expected - large metal deposits may indicate impending transmission failure.
After a visual inspection, clean the drain plug of any remaining debris or metal particles. Be sure to clean the threads well.
While you clean the drain plug, don't forget to clean the transmission fill plug as you did the drain plug.
Once the drain plug is clean, place a new crush washer over the threads to ensure a proper seal upon reinstallation.
If you found the drain plug difficult to remove, you may consider applying a very thin layer of anti-seize compound to the threads.
Once all of the transmission fluid has been drained, replace the drain plug. Be sure to clean the mating surface with a rag before your tighten the bolt down.
Be sure to observe factory torque specifications when tightening the drain plug bolt.
Factory spec. for a Mazda MX-5 Miata is:
torque: { 40-58 N/m \ 4.0-6.0 kg/m \ 29-43 lb/ft}
With the fill plug removed, begin filling the transmission with the required volume of transmission fluid.
You may have noticed a fluid transfer pump in figure 1 - we thought we would try this as the fill location for our subject vehicle is in a very difficult to reach location. In short, it was almost a disaster. Next time we change the transmission fluid, we will likely use some form of large syringe.
Factory spec. for a Mazda MX-5 Miata is:
specified oil: { API GL-4 or GL5 \ SAE 75w90 }
volume: { 2.0 L \ 2.1 US qt. \ 1.8 Imp. qt. }
transfer pump failure too graphic to be shown
With the transmission filled, replace the transmission fill plug. Be sure to use some high temperature thread sealant on the fill plug prior to installation. As always, observe the factory torque specification for your vehicle.
torque: { 25-39 N/m \ 2.5-4.0 kg/m \ 19-28 lb/ft}
The first step will be to warm up the engine's drive train thoroughly - this means you will have to drive the vehicle for at least 20 minutes.
Once you have driven the vehicle enough to warm the transmission to its normal operating temperature, raise the vehicle for ease of access - just be sure to keep it level.
Once the vehicle is raised, crawl under and locate and remove transmission oil fill plug. That's right - the fill plug. You want to ensure that you will be able to fill the transmission once you have drained it, so it is a good idea to make sure you can remove the fill plug before draining the transmission.
To aid you in locating the transmission fill plug, consult your factory workshop manual or look for a bolt on the side of your transmission.
The transmission fill plug on a Mazda MX-5 Miata is a square 14mm bolt - an odd shape, but what Mazda chose none the less.
Next, locate the transmission oil drain plug.
To aid you in locating the transmission drain plug, consult your factory workshop manual or look for a large bolt near the bottom of your transmission.
Once you have located the drain plug, place an oil catch basin beneath the drain plug. As a tip, we use a sheet of vapour barrier underneath the vehicle to localize any oil spills. Also, use newspaper to sop up any drips.
With an adequately sized oil catch basin in place, remove the drain plug and allow the oil to drain completely.
Caution: The transmission oil should (will) be very hot at this point. Keep this in mind when you remove the drain plug bolt.
With the drain plug removed, inspect the top side for large pieces of metal or other debris. Generally, transmissions will see some wear which will be indicated by a fine metallic paste which will be held to the drain plug by the magnet within.
Fine particles are to be expected - large metal deposits may indicate impending transmission failure.
After a visual inspection, clean the drain plug of any remaining debris or metal particles. Be sure to clean the threads well.
While you clean the drain plug, don't forget to clean the transmission fill plug as you did the drain plug.
Once the drain plug is clean, place a new crush washer over the threads to ensure a proper seal upon reinstallation.
If you found the drain plug difficult to remove, you may consider applying a very thin layer of anti-seize compound to the threads.
Once all of the transmission fluid has been drained, replace the drain plug. Be sure to clean the mating surface with a rag before your tighten the bolt down.
Be sure to observe factory torque specifications when tightening the drain plug bolt.
Factory spec. for a Mazda MX-5 Miata is:
torque: { 40-58 N/m \ 4.0-6.0 kg/m \ 29-43 lb/ft}
With the fill plug removed, begin filling the transmission with the required volume of transmission fluid.
You may have noticed a fluid transfer pump in figure 1 - we thought we would try this as the fill location for our subject vehicle is in a very difficult to reach location. In short, it was almost a disaster. Next time we change the transmission fluid, we will likely use some form of large syringe.
Factory spec. for a Mazda MX-5 Miata is:
specified oil: { API GL-4 or GL5 \ SAE 75w90 }
volume: { 2.0 L \ 2.1 US qt. \ 1.8 Imp. qt. }
transfer pump failure too graphic to be shown
With the transmission filled, replace the transmission fill plug. Be sure to use some high temperature thread sealant on the fill plug prior to installation. As always, observe the factory torque specification for your vehicle.
torque: { 25-39 N/m \ 2.5-4.0 kg/m \ 19-28 lb/ft}
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