5VZ Oil Cooler O-ring Mishap

[brillo_76]

Neither the hoses or the oil cooler were leaking, and I still elected to replace them. 23 year old hoses that were beginning to swell, they exceeded their service life. They will leak, or worse, burst, and I would rather replace them from the convenience of my driveway than on the road. All of the other coolant hoses have been replaced. I just have the fuel system lines to focus on next.

Diverscale- The original oil cooler was just cleaned thoroughly. That part costs a bit much to replace ($420+).

Thanks everyone for the advice. Replacing it tomorrow. Will keep this thread updated.

Excellent call if you see swelling hoses. That's a dead giveaway to replace them.

That happened to my 2 radiator hoses. They wouldn't reseal after changing the timing belt.

If the constant tension clamps no longer seal. It's time for new hoses...

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[ToyotaBrah]

Update:

Completed the job last night. New o-ring went on fine and applied grease per the suggestions here. Worked terrific, thanks again.

Going to talk about some of my findings:

1. Oil cooler o-ring 90301-61004 was revised at some point. The seal itself is larger compared to the older version and has an inner seal lip. Pics below.

2. I have a comparison pic below of the old U hose and new one. Notice the swelling of the old hose. This is a region of the engine that sees high temps from the block and the exhaust manifold.

2. Not necessary, but I found the job to be easier with the alternator removed. Allows easier access to the longer hose clamp that connects to the water pump. My old alternator had 268K so I chose to replace with a factory reman.

3. For the union bolt removal/install I used a long extension, with a swivel joint and impact through the drive wheel well (wheel removed). Torquing it to the factory torque spec of 43 ft lbs was hard to achieve. The whole cooler kept on shifting clockwise and bending the stay bracket that hugs the block. I just went to my 2nd setting on my Milwaukee impact and was more or less in the ballpark of 43 ft lbs. Zero leaks and will continue to monitor for the next few weeks.


All things considered, not a bad job for a rookie tech like me.

 

[ToyotaBrah]

How did you clean it? Are there any mechanical parts to service in it?

No mechanical parts to service. It just has a series of baffle chambers inside. I sprayed brake clean to degrease and managed to remove most of the residual oil by holding it up at an angle to allow drainage.

The coolant inlet and outlets were not plugged with old coolant, so I did not have to spend time cleaning them out.

 

[brillo_76]

Look at that snazzy Alt.. All shiney and bright..

 

[poisedforflight]

No mechanical parts to service. It just has a series of baffle chambers inside. I sprayed brake clean to degrease and managed to remove most of the residual oil by holding it up at an angle to allow drainage.

The coolant inlet and outlets were not plugged with old coolant, so I did not have to spend time cleaning them out.

Thanks. I'm going to replace the hoses so I might as well clean it while I'm in there.