Monday, March 18, 2013

Clearing Choked Scuttle Drain on the W124



The W124 is a magnet for dead flora.

On dry seasons, one may not mind much about the leaves accumulating along the scuttle drainage paths.

However, once it rains, the scuttle drains might get choked and the dead leaves start to become compost and chokes up the drain.

As we live in the tropics and park under trees for shade whenever the ride is taken outdoors, there is an issue with dead leaves and branches choking this scuttle plenum drainage path.

Scuttle Drain Location

The drainage path for water coming down from the windscreen goes narrower as it guides the water down to the floor via a small piping.




If the scuttle drain is choked, the cabin footwell area might start to leak in excess water trapped in the body panels. This wets the carpet with water that is mixed with decomposing leaves and that is one of the causes of bad smells and sour stench of the interior cabin.

Signs to look out for will be watermarks on the plastic walls of the interior front footwells.

Water marks at this area may be a sign of
choked scuttle drains

To clear the choke, one will have to do it not from the top, but from the bottom where the exterior body panels are.

To clear the choke, first locate the fender panel just ahead of the door panel.

Right under the panel, there should be a short rubber tubing to channel the water out.

Drain pipe location that requires some "poking"


Pour about 1 liter of tap water over the windscreen and look under the fender to see if water is coming out fast from the rubber tubing.

Use a long screw driver or hex key to push through the rubber tube and observe the amount of gunk that is coming out.

It is highly recommended to use waterproof gloves for carrying out this task and it is not amusing when up to half a kilogram of decomposing gunk can be cleared from the scuttle drains from each side!


The decomposing leaves choking the drainage path can be quite a friendly habitat 
for many insect species. 

If you find your ride constantly having crawlies around, no matter how much insecticides you use on the interior cabin, it'd be worth performing the drainage clearing exercise every now and then.