Turbo - Oil Drain Fabrication
A few tricks of the trade explained!!
Another challenge with the -an fittings is that there are limited angles available i.e 30,60,90 degree but a lot of the time you may need 17 degrees (for argument sake). So this is where using the tube elbows can be an advantage.
These next pictures will show you the angle difference that the tube elbows can make over the threaded adapters when setting up the angle of the drain on the turbo.
A few tips to get a good head start!!
- This first tip is a simple one but good one, the center oil gallery that is attached to the turbine housing (rear housing) has a series of bolts that hold it in place. Loosen these and you can turn the center housing to orientate it. You can leave these all loose, we usually just nip the top bolt up (so you can access it with a spanner easily) you want to have at least one bolt nipped up so the housing can't turn freely when taking the drain off and on. By leaving this loose you have the advantage of getting that little bit more or less of an angle once the solid line is tacked up (or once welded), but remember to try and keep the angle within the recommended 15 degrees.
- When setting up the drain start by bolting up the flange to the oil drain section of the turbo. Cut the elbows to the desired angle to clear all the main heat areas. You can mark the position of each bend by adding a line mark from a vivid.
- If the drain line is long then sometimes it does pay to weld it up in sections if there isn't much room between pipes and other parts around the manifold. This can limit how much the line pulls while welding and then you can do the final alignment of the sections and complete the final welds.
- Another great way to tighten and loosen your drain fitting without putting to much strain on the drain itself is to grind x2 flat faces on the weld on section of the fitting, this way you can use an adjustable spanner to hold it firmly.
- Always try to have the bolts for the oil drain flange clear of the turbo flange so you can access them with a socket or spanner. This will also ensure that the bolts or studs for the turbo flange can be accessed and tightened without the drain getting in the way.