When you remove the drain and fill plugs for the rear axle there is a round rubber looking flat washer. It turns out that this washer is not available separately from the dealer. It is only available if you purchase the complete drain or fill plug (they are the same part regardless of where they go on the diff and both are magnetic).
On my ZR1 I had already changed out the oil twice and this spring I will do it 1 more time, when I changed it out the 2nd time back in the spring the rubber washer on the drain plug looked really squashed and was in the process of tearing in several spots. This was what led me to visit the dealer to see if it was available separately and when it wasn't I decided to purchase 2 new plugs that I will use on the 3rd change this coming spring.
Not wanting to keep buying plugs just to get that washer if they get wrecked with future oil changes I decided to see what I can find to replace that washer with. After measuring with some calipers there was an oil resistant O-ring that will fit those plugs.
Available on Walmart.ca it comes in a package of 20 and are 24mm x20mm x 2mm and fits the plugs perfectly. Oil it with some gear oil before screwing in and tightening. Should be fine for numerous changes and if necessary you have some spares to replace.
O-ring
An even better solution is to replace the factory flat rubber washer with an alum. crush washer. I've procured 2 of them and when I finish working on test fitting them on the new plugs I bought I'll post up the results here. These will be replaced everytime you do a drain and fill and easily available at a Japanese car dealer so you can stock up on them also should you do lots of drain and fills on your rear axle.
Tony
On my ZR1 I had already changed out the oil twice and this spring I will do it 1 more time, when I changed it out the 2nd time back in the spring the rubber washer on the drain plug looked really squashed and was in the process of tearing in several spots. This was what led me to visit the dealer to see if it was available separately and when it wasn't I decided to purchase 2 new plugs that I will use on the 3rd change this coming spring.
Not wanting to keep buying plugs just to get that washer if they get wrecked with future oil changes I decided to see what I can find to replace that washer with. After measuring with some calipers there was an oil resistant O-ring that will fit those plugs.
Available on Walmart.ca it comes in a package of 20 and are 24mm x20mm x 2mm and fits the plugs perfectly. Oil it with some gear oil before screwing in and tightening. Should be fine for numerous changes and if necessary you have some spares to replace.
O-ring
An even better solution is to replace the factory flat rubber washer with an alum. crush washer. I've procured 2 of them and when I finish working on test fitting them on the new plugs I bought I'll post up the results here. These will be replaced everytime you do a drain and fill and easily available at a Japanese car dealer so you can stock up on them also should you do lots of drain and fills on your rear axle.
Tony