Status of 1 piece PHH replacement????

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I'm just going to plug both ends and drive it. So little coolant goes through such a short hose, it just couldn't be that important. This is a pretty poorly planned vehicle; I'm sure this hose connecting the block and the heater valve isjust another example of poor planning and design by Toyota. :rolleyes:
 
I had put this issue off for years with frequent inspections, and I finally tackled it two weeks ago. It's a very difficult repair as many have said. I replaced the entire hose and metal pipe with a carefully routed piece of Gates Green stripe hose. I am not going to argue wheather it's a better repair or not, however, I feel confident that if it fails on the road or on the trail, I could fix it in 15 minutes. It's the pipe that's the problem, and once that is out of the equation, this repair is easy. For the last 4 years I have carried a 2 foot lenght of 5/8 hose and clamps just in case the PHH went out. That hose is still there as my back up if the green stripe goes. The green stripe though, is really nice high quality stuff, I doubt I'll ever have to replace it, but if I do, the job will be easy. I have 5 year old lengths of green stripe on my FJ40 that look and feel as good as the day they were installed. I personally do not think burst strength is an issue at all. That Green Stripe is extremely tough.

Here's a question, though. I'll have my head off to replace the HG sometime in the next 3 years. During that repair, the PHH will be easy to access. At that point should I re-install the metal pipe while the intake is off? It may depend on if there have been any issues with the now longer PHH, which is no longer "pesky".
 
Cruiserdrew said:
Here's a question, though. I'll have my head off to replace the HG sometime in the next 3 years. During that repair, the PHH will be easy to access. At that point should I re-install the metal pipe while the intake is off? It may depend on if there have been any issues with the now longer PHH, which is no longer "pesky".
Click to expand...

Several guys that have left the metal pipe have suggested the bottom bolt should be left out if you decide to use the pipe. Here is a pic.

PHH_Bottom_Bolt.JPG


-B-
 
I approached the hose replacement as a puzzle and not an obstacle. In that light it was an enjoyable challenge.

PS, not replacing both bolts and the pipe would be cheating! :)
 
Nice thread.
I have yet to tackle the PHH.
I regret not doing it while replacing the starter contacts.
So to get this thread back on topic.
I have not heard one negative feedback concerning removal of PHH pipe and replacing it with hose only.
As for me, I will be finding new gates green stripe and using breeze constant tension clamps on existing pipe.
 
No harm, but there is no need for constant torque clamps with the gates greenstripe hose. So you can save a little trouble and use any good quality clamp.
 
Dusty's "THE MAN" on this one, in my view.

Way to go, being irreverant and thinking outside the box.
I had missed Dusty's original PHH posting. Now, after reading it, it's obvious! Just ditch the PHH. It seems that others thought of it before you, but in all the continued discussions on this issue (ad nauseum), the simple alternative never comes up.

It's not worth discussing anymore.

Now, here's what's REALLY important. I'm an engineer. Why don't
MY designs and ideas get the blind loyalty that everyone seems
to give the Toyota engineers? Wakarimasen! (Engl.: WTF?)

Signed:
Disrespected Depressed Engineer
 
Bambusiero said:
Now, here's what's REALLY important. I'm an engineer. Why don't
MY designs and ideas get the blind loyalty that everyone seems
to give the Toyota engineers? Wakarimasen! (Engl.: WTF?)

Signed:
Disrespected Depressed Engineer
Click to expand...

I'm an engineer too. Now remind me again which engine you designed that went into mass production for one of the largest auto manufactures?

:flipoff2:
 
Answers!

Alright! I get to flex all that OEM purchasing knowledge I had to do for cooling systems years ago! WOOT!

Why is there a PHH? Because hose costs the OEM about 5X to 10X compared to the price of Al or other cheap tube. Thus, the Toyota engineer and buyer hit their cost targets for the cooling hose system because they used as little hose as possible (making possible that :censor: little PHH we know and love - or are challenged by, as Rich asserts). Had not one whit to do with burst strength over length concerns.

Typical Japanese OEM rad hose - a high quality medley of polymers, extruded inner tube, knit KEVLAR(!) reinforcement, and then a pretty outer cover of the same, or similar material, as the inner tube. Bake (actually vulcanize in a kettle), till done JUST right. Cut to length. Voila! (At Honda, the OEM hose was SO tight, the installation was almost impossible. It was explained that the engineers wanted the mechanical interference to do the job of sealing off the gap. That clamp was there just to look pretty.)

Just wait till I get to expound on radiators, including cores, tanks and more!

Have a good one, guys! :grinpimp:
 
Truckasaurus said:
Just wait till I get to expound on radiators, including cores, tanks and more!

Have a good one, guys! :grinpimp:
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Well don't keep us in suspense there Larry, post away. We all love the minutae of how things really work. Why Toyota chose failure prone plastic tanks would be a good place to start...
 
Hey Andrew
Why would you want to put the pipe back in there would that not defeat your easy trail repair? If you have a spare 2 connection possible leaks instead of 4.
 
Truckasaurus said:
Alright! I get to flex all that OEM purchasing knowledge I had to do for cooling systems years ago! WOOT!

Why is there a PHH? Because hose costs the OEM about 5X to 10X compared to the price of Al or other cheap tube. Thus, the Toyota engineer and buyer hit their cost targets for the cooling hose system because they used as little hose as possible (making possible that :censor: little PHH we know and love - or are challenged by, as Rich asserts). Had not one whit to do with burst strength over length concerns.


Have a good one, guys! :grinpimp:
Click to expand...

Why is there a PHH?

Imagine being the guy at the factory hooking up the heater hoses. The hard line would take minutes to hook up with the 3" piece. A long hose would be difficult to do at the factory and create routing problems and potential issues down the road. When the engine is dropped in with the hard hose, it's routed to the right place every time for easy hook up.

That's my theory anyway.
 
i gotsta long hose and it works great! :D ...read it how you like
 
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