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Custom Yoshifab Turbo Oil Drain
for Volvo Turbo Red Blocks

     UPDATED: February 13, 2019                       CONTACT       
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Custom Turbo Oil Drain Hose for Volvo Turbo Red Block
Using Yoshifab Block Fitting
<<< When Volvo designed the 240 Turbo engine they used a rigid steel drain pipe for the turbo oil return (same design for later 740 Turbo and 940 Turbo). The lower part of the pipe was designed to seal into the hole in the block. Despite having a rubber o-ring on the pipe, these tubes usually leaked at the block.  If you fit a different turbo like I did, you'll probably find the rigid pipe no longer works. I was using a cobbled together pipe for years.

I'm happy to report that Yoshifab has brought the red block drain pipe into the 21st century by introducing a new custom hose fitting that fits into the existing hole in the block and allows you to use modern racing hose and fittings for a much better drain system. 

<<< This was really good news to me because I really hated the drain tube I had cobbled together to fit my Mitsubishi TD04 turbo (from an 850 Turbo).  I installed it to a late model (90+) exhaust manifold, but this turbo meant a standard metal drain pipe would no longer fit.  The pipe I made was functional, but I didn't trust the soft hose there in the middle due to the extreme heat it was subjected to (even though it was reinforced silicone construction). 

<<< It failed at least one other time over the years (see photo).  Silicone hose is not designed for such heat and I just knew it would eventually fail again.

<<< So I bought the Yoshifab Turbo Red Block -10 Oil Return Conversion Kit and installed it in my 242 Turbo. The kit can be found at: https://yoshifab.com/store/turbo-red-block-10-oil-return-conversion-kit.html.  This fitting is designed to fit precisely into the existing Volvo block drain hole. 
<<< The fit is so precise that the instructions call for this fitting to be placed in the freezer before tapping it into the hole.  Yoshifab supplies an adhesive to seal and secure the fitting.  The top of the fitting is threaded for a standard -10 AN racing hose fitting that you can buy anywhere. 

NOTE: This only works for factory turbo engine blocks (B21FT, B230FT, etc). Non-turbo engines do not have this hole for this oil drain.
AN racing style hose internal dimensions are measured in 1/16th of an inch increments. 
-8 AN is 8/16th of an inch ID (1/2 inch).  -10 AN is 10/16ths of an inch ID (5/8 inch). 

<<< I bought a 3 foot section of hose to go along with the fittings.  I chose PTFE core stainless steel braided hose, which has a Teflon inner core. This hose is designed for hot, high-pressure oil and has high temperature rating of 400 degrees Fahrenheit.  This item: SUM-2201010 Hose, PTFE, Braided Stainless Steel, -10 AN, 3 ft. Length. Found here: https://www.summitracing.com/parts/SUM-2201010. 
<<< I bought TWO of these AN hose end fittings at Summit Racing: SUM-250090B Hose End, for PTFE -10 AN Female Black Aluminum. Found here: https://www.summitracing.com/parts/SUM-250090B. 

<<< These are Tube Ferrules. One of these goes into the above hose end fitting. Hose end fittings like this are re-usable, but it's important to note that if you disassemble one after it's been installed, you must replace the TUBE FERRULE before re-installing. The ferrule is designed to get crushed against the hose liner during assembly and the old ferrule is NOT reuseable.  Replacement tube ferrules are available. The -10 AN fittings above use .625 inch ID cone style ferrules like those found here: https://www.summitracing.com/parts/rus-620505/.

Assembling PTFE hose ends is not difficult, but you'll need some guidance if it's your first time.  There are good instructions here: http://anfittingguide.com/install-ptfe-hose-fittings/. 
And a good video HERE.

<<< I found this -10AN Aluminum Turbo Oil Return Drain Flange on eBay to fit my Mitsubishi TD04 turbo. 

<<< Here is my new assembled drain hose ready to go in.  Overall length for my new hose was 16 inches . . . .

<<<  . . . however it could have been shorter by at least 2 inches and it would still fit just fine.  Now I have piece of mind that if something is going to break, it will not be that drain hose. 

This PTFE hose is rated at 400 degrees Fahrenheit, but a disadvantage of using this hose is that's it's pretty RIGID, which can make it difficult to make sharp bends.  If you need something more flexible, have a look at the Aeroquip Socketless below.

Keep in mind that if your engine has a later (740/940) style oil filter mount, like shown here, then your hose may need a 45 degree fitting at that block fitting to clear the filter.
<<< If you find the PTFE hose is a bit too rigid and you're looking for something more flexible, perhaps a rubber type hose will suit you better.  Yoshifab will tell you they prefer using Aeroquip Socketless Hose (pictured at left). That's a rubber core hose that uses special barbed hose fittings. Assembly is much faster and easier and routing them is easier because they're more flexible. Aeroquip Socketless hose is rated at 300 degrees Fahrenheit. More general info can be found here: https://www.jegs.com/p/Aeroquip/Aeroquip-Socketless-Racing-Hoses/750321/10002/-1

<<< While no clamps are technically required for Aeroquip Socketless hose, Yoshifab recommends adding a clamp on this hose, especially if it will be carrying high pressure oil.  A simple Oetiker Clamp or Pinch Clamp is the recommended type and may be easily found at Summit Racing, Grainger or other parts suppliers.
Here are some videos on installing Oetiker clamps:
Here's a good resource for general AN hose and fitting sizes, dimensions, thread pitches, etc. It helps explain many different types of AN fittings and standard thread pitches used.

Here's a good video on cutting stainless braided hoses:

Here's a good video on assembling these PTFE fittings:


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