03-22-2012, 05:09 AM
Location: Panhandle of Florida
Join Date: Nov 2005
Mein Auto: 335 vert/14JGC/ 17Outback
E93 Part 2 Top Lubrication
Lubricants for Our E93 BMW
The collection of hinges, bushings and bearing that allow our tops to operate will operate a long time without doing much to them. However just like giving your car an oil change your linkages for this complex top require attention too. You can use almost anything that provides lubrication such as WD-40, Kroil, 3-in-1 oil, and Lithium grease. The question is what is best? WD-40, 3-in-1 Oil and Kroil are all fine lubricants but are light and will wear off whereas Lithium grease will adhere to anything it touches and not wear off as fast. It may not be as easy to apply as lubricating oils but them it will not drip out after application.
WD-40 is actually a water displacement product and not intended for use for our application. If you apply this product frequently it will work but it was not designed to be durable for bearings and bushing but designed to displace water thus the reason it is used so much in the marine industry. I use this all the time on my sailboat and jetski after use in salt water. This inexpensive product can be sourced virtually at any grocery store or hardware store.
3 in 1 Oil has been around since initial formulation in 1894. It has been reformulated for modern applications and is also owned by the same company that owns WD-40. It is a general purpose lubricant which is excellent for our top moving parts like bearings and bushings. It is light in weight around SAE 20 but suitable for application. Because of the light weight using a rag to catch the excess dripping is desired. While considered an older lubricant it serves the purpose well and I use this product. It does not penetrate as do other lubricants so you need to apply in a couple locations to get the bushing or bearing coated. If you can turn the bushing or bearing you can apply in one location and get sufficient coverage by rotating it. This inexpensive product can be sourced in virtually any hardware store, Walmart, some grocery stores as well.
Lithium grease is a grease that is sprayed out of a compressed can like WD-40 and exits like a heavy liquid and then flashes off when exposed to air and becomes sticky. Lithium grease is actually a combination of oil and soap. It is suitable for all of our top applications meaning bushings, bearing and linkages that slide. However it is not easy to apply unless you are careful and use a straw inserted into the discharge nozzle and is messy requiring clean up with a solvent that can remove a grease. I use this product for areas that slide on our top and also on the door striker, hood latch areas anyplace where a lot of exposure to the elements will occur and you want something to stick. Again application is key for this product and getting this grease into the bushings and bearings while harder to do because it is messy results in a lubricant which lasts a long time and does not drip out. The areas where you apply it to sliders should be lightly applied where the sliders meet each other or if a slider is capturing a bushing coating the inside of the slider and outside of the bushing is ideal. Wipe off the excess as quickly as you can before it changes state from a heavy liquid to a grease. It is inexpensive and can be located at most any hardware or auto parts store.
ACF-50 is used in the marine and aircraft industry to prevent corrosion of metal parts and protection of electronic components like switches. It is a light weight lubricant that is not totally suitable for our bushings and bearing yet alone the sliding components. However it is presented here for those that live in a climate where you can get corrosion on the top assembly or very high humidity areas that can cause corrosion. In those areas this would be the product to apply for protection from corrosion followed by a more suitable longer duration lubricant as cited above. It will provide 12-18 months of protection and does not attract dust, dirt as will other lubricants. Only a very small percentage of our members will have need for this product but it is provided here so they are aware it exists. Compared to the above products it is a more expensive and has great application for owners that have marine or aircraft too. Typically you have to order ACF-50 online.
Kroil oil is a penetrating oil which will penetrate into the bushings and bearings. It is suitable for getting a light lubricant into these locations when you have not kept up on maintenance for a while meaning you may have a dried out lubricant in the bearings or bushing. I cite Kroil here because we do have members that may never touch their top moving assemblies for many years and when they stumble upon this DIY thread it might save them a lot of grief. This penetrating oil is the first step for the moving assemblies of a neglected top. Following application with a straw inserted into the nozzle of the spray can it should be allowed to sit (wipe the excess oil off) for a day. Once it has sat you can try to operate bushings or bearings that are frozen or stuck. Once free you can then retreat with a more suitable lubricant as listed above. Strongly recommend this product for neglected linkages that need to be freed up. Kroil is about as expensive as ACF-50 and typically has to be ordered online.
I visited the BMW dealership to inquire what they use for our top linkage. The BMW dealership technicians typically use two types of lubricants on our E93ís; Wurth HHS-K and our friend Lithium grease. Wurth HHS-K is an excellent lubricant suitable for bearing, bushing and sliders as well. It is about as expensive as ACF-50 or Kroil is and can be sourced online or at those retail stores that sell quality lubricant product and mechanics tools. HHS-K penetrates well, lubricates even under high pressure, and has excellent adhering properties. In short as mentioned above this is suitable for the entire top. It is just not that common a lubricant you can source without some effort. A quick check of Amazon shows it is available online.
Some of the better quality lubricants out there are listed below. Your experience is valued so if you have a product that performs well for our top applications please list it below.
Versilube G322L This product is designed for use as a lubricant on aluminum and steel substrates. Versilube G322L contains additives for enhanced corrosion protection. An ideal product for lubricating and protecting linkages, bushings, bearings, lock hinges, engine components and other mechanisms. G322L is safe to use on a variety of plastics, metals, glass and painted surfaces. G322L provides outstanding viscosity-temperature characteristics, corrosion protection, good adherence while being non-corrosive.
You can find this at various sources like Amazon.
Teflon lubricants are also excellent lubricants if they can be coupled with other carriers that have good adhesion and donít collect dust and dirt.
Without a doubt dust and dirt will find its way on top of the lubricants you use. It is just a fact of life. If you never open your top it will never happen and in general will be a minor issue but be sure before applying any of the products you use wipe the area down with a clean dry cloth. Any lubricant applied to the areas shown below is better than nothing and there is certainly more lubricants that are suitable than listed above. However the ones listed above are typically easy to source and suitable for this application.
Kat has provided a lot of quality pictures that show your top in various stages of operation. Suffice to say that to perform this work you do need the top in these configurations. Required is the lubricant you choose to use (see above), a rag to keep the over spray and drips off your vehicle, latex or vinyl gloves if you are sensitive to these lubricants. You can go the extreme and use Stoddard solvent to wipe any excess off the lubricated area. Most of these products are applied in a spray manner using a straw attached to the nozzle to help direct the lubricant to the intended area. Small squirts are much better than long ones because you want to allow some time for the lubricant to penetrate. If possible move the linkage, bushing or bearings, it will help to distribute the material over the intended area. If possible once the entire top is lubricated operate the top a couple of times to allow the lubricant to disperse. It doesnít typically matter if it is a bushing or bearing since they both require lubrication to keep from seizing up. BMW over the years has used both.
How often should you lubricate your top? It depends upon how often you operate your top. BMW typically used the term Condition Based Service (CBS). It does apply here as well for the owner. There is no right or wrong answer but consider you are moving 400 pounds around on these linkages. I would guess 30-40 operation cycles wouldnít be too soon. This should assure long life out of the moving parts of the top that require lubrication. When the top is in the configurations to lubricate the bearings, sliders and bushings it should not take a great deal of time to do this task. Wiping the areas before applying the product is key. It makes no sense to apply product to an area that has collected dust and dirt and has old dried lubricant. There are simply too many variations of how to apply this product to cover them all but just as you lubricate a hinge on your front door you would do the similar operation for the bushings and bearings. The areas that have a sliding mechanism require a different technique. Once the area is wiped down and clean I would recommend using an applicator like a Q-tip lightly coated in lithium grease and apply to the inside of the sliding mechanism that is in contact with the bushing and also lightly coat the bushing as well. Wipe excess off and it is common to get grease outside of the intended are.
Please note that these suggestions for maintaining your top are of course not the official BMW sanctioned way to do it. Taking it to the dealer and allowing them to maintain the top for you is. I am certain there are other lubricants that are also excellent and please feel free to add to our thread those that you have had success with so that we all may learn. Please use this thread at your own risk. May your top life a long and well lubricated life.
I will now attempt to put some verbiage to the annotated pictures that Kat has taken of our top. The first picture shown below shows the top with one smaller linkage suitable for light weight lube and a more significant linkage that is best lubricated with Lithium grease or HHS-K spray. A couple small shots around the linkages on both sides should do it, be sure to have your rag ready too to capture anything that drips off.
The second picture shown below shows a main linkage for our E93. This linkage requires either Lithium G
grease or HHS-K spray again applied around both sides of the linkage. Wipe excess off and it helps to use the rag to catch over spray as well so it doesnít stain any fabric or material that the over spray might reach.
The third picture also shows a substantial linkage which should be lubricated on both sides. Again small short shots around the linkage areas where the linkage articulates around a bushing is where you want the lubricant to be sprayed.
The fourth picture shows a receiver cup and small bushings. Both can be lubricated with Lithium grease or HHS-K spray. Here is where a Q-tip with some grease or HHS-K applied can be applied around the cup and the bushing.
The fifth picture show a pin and light duty bushing. The bushing can be lubricated with HHS-K or 3 in 1 Oil and the pin is best lubricated with a light coating using a Q-tip or rubber gloved finger.
The sixth picture shows three substantial bushing or bearing (I donít have my E93 and canít tell from the picture) that require Lithium grease or HHS-K spray. You need to use small shots of spray around both sides of the bushing/bearing being careful of over spray. Wipe the excess off once it has set up and before it drips on to the car.
The seventh picture shows a substantial linkage that is best lubricated with Lithium grease or HHS-K spray. The bushing/ bearing (again canít tell since my car is not available) is serviced with a few shots around both sides being careful again to not let excess spray to drip or over spray to reach other areas of your car.
The eighth picture shows a medium duty bushing that should be lubricated with Lithium grease or HHS-K spray. This is a case that 3 in 1 Oil would also be suitable but grease and HHS-K sticks better. Again lubricate both sides of the bushing and wipe the excess off.
The ninth picture shows a receiver cup that can be lubed with Lithium grease or HHS-K spray. Using your gloved finger or a Q-tip works just fine.
The tenth picture shows a linkage arm that can be lubricated with Lithium grease or HHS-K spray. Note that you can see the lubricant around each side of the linkage arm. You can leave it this way or you can wipe any excess off.
Last edited by fun2drive; 03-22-2012 at 05:13 AM.