300 tdi oil cooler fitting thread size - Defender Source
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  #1  
Old September 12th, 2011, 10:03 PM
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mark kellgren
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300 tdi oil cooler fitting thread size

My oil cooler is doing nothing for me with a 2.8, and i want to tap into it to help a little with coolant temp. I need to know what thread size the pipe fittings are for the oil cooler, so I can get some brass barbs to attach hose to and splice the cooler into my coolant circulation.

Anybody know?
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  #2  
Old September 13th, 2011, 05:25 AM
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I took my lines to a industrial shop and had J8 fittings welded on, then it is easy to source replacement flex lines. If you did this you could have lines made to add an extra oil cooler. I didnt like the idea of barbed fittings, even though many kits come with them.

I have been thinking about doing away with the radiator oil cooler all together and going external, but I like your idea of running an additional cooler in line. Then if there was a problem you could easily go back to stock with OEM parts.
What cooler have you been looking at?
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  #3  
Old September 13th, 2011, 06:31 AM
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Don't know, BUT....The most popular pipe fittings are NPT, BSP, or (less likely) metric. I would recommend, however you proceed, that you find the proper adapter to install Aeroquip-style AN fittings with stainless shielded hoses.
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  #4  
Old September 13th, 2011, 08:26 AM
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Wow. I totally miscommunicated what I'm trying to do. Let me try again.

The 2.8 does not need an external oil cooler as it has an integrated cooler on the block, so right now, my 300 tdi radiator has NOTHING attached to the oil cooler at all-the tank is empty. That said, my engine runs a bit hot on the highway when it gets close to 90F+ on the highway, so what I want to do is put barbs on the radiator oil cooler tank fittings and run my coolant in line through that spare unused tank for some additional cooling capacity.

Recently I ordered a replacement radiator from RN when I was dealing with my leaking head and overheating problems. I ordered a full 300tdi radiator with NO oil cooler to get the max cooling capacity, but they still sent me the incorrect but standard 300tdi radiator WITH oil cooler. As my previous radiator was shot I had no choice but to install it instead of sending it back. I want to take advantage of the extra tank cooling that the RN mistake robbed me of, rather than have to order another radiator to correct the problem. I want the 5/8 ID line running to the expansion tank to flow throught the oil cooler first.
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Old September 15th, 2011, 02:23 PM
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Ok, for sake of posterity, I figured it out today. 5/8" NPT. At lowes its in the compression fitting section.

Now to find 5/8 barbs in a compression size...
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  #6  
Old September 16th, 2011, 07:13 AM
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5/8 NPT?......I'd thought it was more like 3/8. 5/8 would be fawkin huge.
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  #7  
Old September 16th, 2011, 08:41 AM
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Tom Rowe
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Not to mention there isn't any such thing as 5/8" NPT.
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  #8  
Old September 16th, 2011, 09:08 AM
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no, it definitely isn't npt. but it was marked as 5/8 OD in the brass compression fittings section at Lowe's. I'll have to get more detail on thread type. couldn't find any.
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  #9  
Old September 16th, 2011, 12:34 PM
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Tom Rowe
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Probably 5/8" compression x 1/2 or 3/4" MIPS or FIPS.
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