Port seals have a special shape that makes them seal under pressure. It also applies to the front distributor p/n 1298000022. Port seal failure is becoming more and more common as the R129s age. They seal the hydraulic lines where they are pushed into the cylinders. They are usually the last seals to fail, but these o-rings are penny items.Ĥ) Port seals. These are just o-rings that seal the top cap of the cylinder from the housing. Crumbling piston seals can block valves or pinholes inside the hydraulic system, and it can be difficult to diagnose a piston seal failure without testing several cylinders once you find that your top is moving slowly or not at all.ģ) Gland seals. Early model years have the added problem that the piston seals swell up and make it very hard to move the piston inside the cylinder. Failing piston seals will cause internal leaks, which result in a pressure drop in your hydraulic system. The piston seals have been made of different materials and sizes even in the same p/n cylinders throughout the years. ![]() They seal the input and output sections from each other, as the piston slides through the cylinder. These are usually the first seals to fail in the cylinders.Ģ) Piston seals. When they fail, you will see fluid coming out next to the chromed shaft (rod). They are cup-shaped and seal the piston rod from the rest of the cylinder. Top Hydraulics replaces and upgrades ALL seals in the cylinders with our superior proprietary material:ġ) Rod seals. What fails most frequently, are the other seals, which have special shapes for proper function. Every R129 cylinder has one o-ring, and those rarely ever fail. Rebuilding these cylinders is NOT a matter of changing o-rings. (The left tonneau cover lock was omitted after 1996.) The original seals in the hydraulic cylinders, aka rams or actuators, will eventually fail in every R129, unless it gets wrecked prematurely, even if you never drive the car or have never used the top before. Model years 1990-1996 have twelve hydraulic cylinders, while 1997-2002 models have eleven hydraulic cylinders that move and lock the roadster soft top. We have two order methods: Either you send in your cylinders first, or choose to "Order now with Core Exchange". Note also our rebuild service for hydraulic valve blocks, distributors, and pumps, as well as manufacture new, superior hydraulic hoses.ĭIY cylinder rebuild will usually lead to unintended damage - we have seen thousands of ruined cylinders from failed DIY repair attempts! Top Hydraulics' cylinder rebuild service is widely known as the best possible option, even if you are an excellent Do-It-Yourselfer. Rebuild/Upgrade Service for convertible top hydraulic components on Mercedes R129 models 280SL, 300SL, 500SL, 600SL, S元20, SL500, SL60, SL600, SL73. Please check and amend what you have entered.Mercedes Benz R129 SL-Class | Model Years 1990 - 2002 ![]() To help protect you, we have some rules in place if we think it's been mistyped. You will be notified whether or not you are the highest bidder when the auction starts.īids are contractually binding. When there are two max bids of the same value, the one placed first remains the lead bidder.Ī pre-bid means you\'re able to place a bid before the official start of the auction. You can bid again and we will use our automatic bid system to try and get you as the highest bidder. When you place a max bid and are outbid immediately that means that another bidder has placed a max bid limit which is higher than yours. We will keep you in the lead up until your maximum bid OR the increment closest to your maximum bid, providing your maximum bid is enough to cover the increment value.Once the reserve has been met, Car & Classic will make sure you are the highest bidder using only the bidding increments stated below.If you are the highest bidder and place a maximum bid above the reserve, we will automatically put in the reserve as your first bid.If your maximum bid is equal to or below the reserve price, your maximum bid will be applied in full if you are the highest bidder.
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