Oil "cooler" heater hose question

[tucson_sailors]

Greetings -

having recently noticed that an oil leak has caused some heater hose softness, I've been thinking about a field repair that I once had to do in a parking lot. The small hose on the water pump that runs from the lower pump thats about 3 inches long, to a hard pipe that goes underheath the A/C that is an absolute PITA to field replace. Was wondering if anyone has replaced/bypassed the hard pipe 15777B with just an additional length of hose to the oil coller hard pipe. Seems to be the easiet soltuion, but there had to be some original reason for using a series of hard pipes and short connectors, but durned if I can puzzle out why.

The next question would be with the location chosen, would it be possible to find an oil resistant high temp silicone hose by the foot to make that one section. Other heater hoses don't seem to have the proximity to oil leaking areas to be needing oil resistant hoses as much, but I do have some leaks down low, and don't necessarily want to worry about them causing a soft hose again post replacement, and then blow out.

Can't puzzle out how to attach/imbed an image (don't have any social to link to and its been ages seen I posted a new message with images) but its the usual oil cooler hose routing diagram from the FSM which I have saved as a desktop image. If someone can post the secret handshake steps to post a local non web based image I'll put it up in a later edit.

Thoughts?

Glenn in Marana, AZ

 

[tucson_sailors]

Figured out how to add in a reply. Proposed solution would be to run a single flexible hose from the port on the water pump, remove 15777B and then under the AC pump area or whatever routing can be worked out to the hard fitting on the right side of the oil cooler box 15710 with appropriate clamps. Thinking might possible need stress relief for rubbing up against somewhere depending on how close the hose has to route, but any other immediate problems anyone can see?

Glenn in Marana

 

[cps432]

It seems to me that it will be difficult to make that bend, even with silicon. My other concern would be if that hose decided to jump around and rub against the belts or pulleys. I've had my truck apart for the past few months and don't remember exactly how close everything is in there. I've had to replace that small section as a field fix before and you're right "f*** my life" comes to mind when I remember that day. I think what I ended up doing was removing the hard line from the timing plate and pulling it out of the truck, attach the new hose to it and then use the hard line as a handle to gain leverage when installing the new piece. Not fun either way. That whole area is a serious PITA. Seems like Toyota was looking for an easy solution for the oil cooler option for factory set up but wasn't too concerned with maintenance issues down the road. Using silicone for that small section seems like a good idea but I'd still keep that hard line where it is. Also, the bolts that hold the bracket to the timing plate have a torque spec and can be a source of oil leakage. Ask me how I know...

 

[OSS]

That pipe is there because of the cramped space, long run, sharp turn and vibration. It's pretty risky running a long rubber hose down there for those reasons.
You can't use silicon tubing for cooling hoses. It's too flexible and can't take the psi.

That pipe is easy to get at .... if you remove the radiator etc. But then I guess that isn't so easy in itself.

 

[cps432]

They ceritanly make silicon hose that is specifically designed for coolant and it out performs rubber hose by a mile. I ran a foot of it in my truck for two years when I couldn't find any rubber that would fit. Recently I changed everything and it was the only hose that wasn't leaking. It costs an arm and a leg however. I think I picked it up from NAPA.