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Oil Cooler on 3.4L

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Fawk Awph

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Discussion starter · #1 ·
well, the way my motor mounts are ive been having problems with the coolant lines to the oil cooler keep rubbing though, and the fitting is in a terrible place. i was wondering how important the oil cooler is, it would fix so may issues if i could just cap off the coolant lines. what do you guys think?

if i keep it i need to find a 90* metric pipe fitting for the block, or drill it and tap it for a standard one (do no want to do!). any word on where to find a 90 in a 16 or 17mm pipe?
 
Discussion starter · #5 ·
yours has one, its just behind the oil filter on the drivers side of the block, it looks like a 4" across, but 1" deep canister with a couple lines going to it, its got a 15/16 bolt holding it onto the block.
 
#7 ·
no oil cooler

Nope, dont have an oil cooler. My engine has a factory block off for it....never had it. I looked into adding it off of another truck because it looks like it would bolt on but never got around to it. never had any issues with oil breaking down or engine temps. I change the oil at 3k and run synthetic. I used to run allot on the highway as well with no issues....
 
#10 ·
oil cooler

I remember now that my water pump didnt even have the port for the oil cooler....When I bought a new water pump and did the timing belt i realised this because the replacement had a port for it. Otherwise the waterpumps were identicle. I chose to run it and plug it just in case I ever needed the cooler. Never did so i never added. Where the cooler should be there is a large domed silver plug that is held on with a bolt through the center. Factory toyota thing....So in fact some did not come with a cooler. Is it better to have? yes probably....Do you need it? I havent found any reason to add it because it always runs cool even with no schroud and a small v6 radiator....If you have it on I say run it...
 
#11 ·
decided I would like to add the oil cooler to my engine. I have the proper water pump with the port . I know I need the cooler its self. After the water comes out of the cooler where does it go? Any ideas on where I could find a good used one?
 
#12 ·
T1tundra told me he runs all his 3.4's without them when we were out wheeling and i burst one of the lines to mine. i plan on capping mine but it never crests 75 degrees here, if you were cruising or crawling at 110 i might be more worried.
 
#13 ·
i am in az and am fighting temps at high speeds on the highway(110 is not that hot here....)plus i plan on adding a supercharger and pushing the engine to the limit. This is why I am considering it. I looked at my buddies rig and it looks like the hose comes from the water pump, to the cooler, and then makes a loop out of the cooler straight into the side of the block. Would anyone want to sell their cooler and the fitting that goes into the block? I think it would help drop the temps of my engine in this extreme heat/load
 
#14 ·
Still trying to find an oil cooler. I looked up the part numbers at toyota and it seems there are different oil coolers depending on 2x4 4x4 auto and manual? Does anyone know the difference? Want to put one on my engine before summer and want to get the right one! If anyone has one let me know!
 
#15 ·
I take that u r talking about the oiltowater cooler. That should really be called an temp maintainer. The ideal temp for engine oil is around 180-190 deg were as the ideal collant temp is around 210. If u want to run an actual oil cooler, a small radiator would be best.
 
#16 ·
so what is the purpose of the factory oil "cooler" then? Does it help keep engine oil from breaking down? I am running a heavy truck with 6.17s and 41s and i do drive it on the highway. I was thinking it would be a good addition to help the engine survive long trips at 3000+ rpm (im at around 3000 at about 70mph) I also live in arizona where temps on the highway can be 120 degrees. I run mobil one 10-30 in the engine and plan on adding a supercharger very soon. Just looking for every possible way to keep my engine happy for longer.
 
#17 ·
It gets the oil up to temp quicker and keeps it there during hard runs.

Oil usually gets substantially hotter than the coolant if you're working the engine hard. That's why the oil cooler actually cools it. A cooler in front of the radiator will cool it more, but oil isn't breaking down at 210 so there's no real reason to.
 
#18 ·
not trying to hyjack this thread but toyota lists several different part numbers for the coolers. seems they are different for auto and manual trans as well as for 2000+. Does anyone know the difference?
 
#19 ·
Don't have a answer but have the same question , doing a swap of a 3.4 out of a 99 Tacoma into an 89 runner that had the 3.0 with the cooler . The 3.4 I picked up has the factory cap off and thinking I want to go ahead and use the cooler , just switch it over but the question of why the different coolers for different applications makes me wonder as well just exactly what are the differences and effects . 120 degrees running down the highway ? I am impressed , I'm up in the Seattle area and have never experienced anything even close to that . Stay cool any way you can right ?
 
#20 · (Edited)
From what I understand there is three different part numbers for the 3.4l oil cooler and I am not sure how to tell which one is which just by looking at them. I do not see any part numbers on the cooler the bolt is also different from what I understand it has a different pressure relief iirc
 
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