The W116 LibraryThe definitive W116 resource!
Started by UOnlyLiveOnce, 04 September 2022, 09:09 AM
Quote from: rumb on 04 September 2022, 01:44 PM"Replacing" would be an unnecessary and costly endeavor. The Vac lock system is really quite simple, but has quite a few components. Using a Mitivac with gauge, start in the drivers door. Check the black 3 way valve first. ( https://www.ebay.com/itm/224731700491) Then pull the rubber lines from each side of the diaphragms and see if they leak. Replace as needed. Then go onto the passenger front door, then the back doors. Next do the gas tank lid and the trunk lock.The entire door lock system is fed from the Yellow vac line near the fuse box. There is a check valve there also.There is also a vacuum tank in the trunk, sometimes that rubber connector wears out and can leak there.You dont have to replace the entire vac actuator, just the Diaphragms.Here is the instructions in the manual: https://handbook.w116.org/Chassis/80-CentralLocking/ New:https://mercedessource.com/store/1973-1980-vacuum-door-lock-actuator-diaphragm-repair-kitWhile the door panels are off it is a good time to lubricate the window regulator and tracks and also lube the door handle and the door lock. Door hinge pins lubrication is usually sorely neglected. The regulator use spray lithium grease on the regulator pivot pin. Use a light lubricant on the slider.001-989-37-51-09 is an excellent light grease for the tracks.002-989-06-51-09 is an excellent door lock spray lube.The door handles come off quite easily. Remove the oval black plug on the side of door, remove 2 bolts and then just push the handle forward. A cleaned and lubed handle feels fantastic when opening the doors.I'd think a good mech could do all of the above for 8 hrs or less.If you are even a bit handy with tools this is a fairly simple way to get to know your car.If you proceed yourself we can provide info on removing door panels, or use the Technical Link at the top right of each page. look for the maintenance manual. https://handbook.w116.org/Chassis/72-Doors/BTW please post pictures of your car!
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