PHH - Finally... X2

[peytonkristen]

I've got two 97 models. My wife daily drives a 40th Anniv and mine is not daily driven but driven a lot. Both have similar mileage and I keep them maintained regularly.

Both engines are original except for normal stuff (hoses, belts, etc.) along with the original PHH.

I've been keeping watch on the PHH and neither have given any sign of failure until now.

The 40th started leaking a week ago with 199,200 miles. I changed it out in about 2 hours thanks to info on here. Actually did the bypass and was very simple. Did a full coolant change, fan clutch, and hoses change at the same time.

Now on my 80 the PHH is bulging and about to fail (see pic) so next week it gets the same treatment. It has 199,800 miles on it.

I think mine went farther than most on here.

I sourced my Gates Green Stripe hose from Oreillys (part# 28441). I bought 15 feet (I have other projects planned) and they gave me the commodity pricing of $2.14/ft. Over a dollar less than retail.

Got my Breeze Constant Torgue clamps from online retailer, Hose Clamp King. Cheap, quick, and easy.

 

[paladek]

So....

199,200 and 199,800 miles.....and no head-gasket replaced ???!!! that's unusual considering these engines....but this gives me hope......mine is at 177,xxx and with some luck I'll will be able to sell it without doing the head-gasket...???!!!

 

[b16]

So....

199,200 and 199,800 miles.....and no head-gasket replaced ???!!! that's unusual considering these engines....but this gives me hope......mine is at 177,xxx and with some luck I'll will be able to sell it without doing the head-gasket...???!!!

Most owners have more miles and are on the original HG. Why do you think it would fail so easily?

I did my PHH at just over 200,000 miles and seemed like it could have lasted a little longer. Took me longer than 2 hours though since not only did I do the bypass; I also bypassed my rear heater hard lines with hose.

 

[baselfish]

indeed dont believe there is any consensus at all at to mileage and HG replacement - 200k - 300k - 400k

believe too the general thoughts are to not even think about it - and just keep rolling and keep yer engine as cool as can be -

Bf

 

[mypancreasbroke]

I'm around 230k and original hg. Just did the phh a week ago after it started to fail. I figure mine went out because of a situation I had after the only time I took my truck in to Mr Toyota. They didn't properly fill the cooling system, I didn't check until after an overheat which caused a tiny hole to form in my phh, but I think it vented the pressure keeping anything else from having issues.

I've been worried about my hg since that overheat, but so far it's passed all tests and seems fine. *fingers crossed*

 

[Whileemptyheadsdream]

It all depends on the longevity of the orrigional Toyota red coolant. The Toyota red coolant from the 90s era turned to acid In as little as 9 months. The longer It was left In after that date the greater the darnage to the H/G. I have a 40th with no rust and the H/G was replaced In 2011. The Inner fender directly below the radiator overflow has completely rusted through from the coolant over flowing during the H/G failure process. I have read this Information In trade journals and other toyota forums about Toyota red coolant from the 90s turning to acid In 9 mo. on the 93 to 97 model years. Good Luck !

 

[Rifleman]

The most important thing you can do for your original head gasket is to STAY ON TOP of your cooling system maintenance! That means not letting your coolant go over two years before replacing it along with distilled water. Along with a complete coolant, and distilled water change, you'll need to do a complete back flush of your cooling system, and that includes both heater cores too. Yes i know, it's a big pain in the ass to do, but it makes a BIG difference in how long your cooling system lasts, plus it really extends the life of your radiator, and heater cores! Lets not forget how much fun it is to replace the heater core in the dash on these trucks when they start leaking.

 

[JM74]

I bought my rig with the PHH bypass done already, had 264,000miles. However upon further inspection of the hose, I found it was rubbing quite alot on my intake manifold and the hose had worn thin in some spots, i quick fixed by zip tying some garden hose around the heater hose (all i had available on the cross Canada trip) it seems to be holding up very well so far protecting the PHH from further rubbing. Im going to be replacing the rad thermostat, rad hoses, and water pump in the spring (if my rad lasts till then *knock on wood*) any opinions on if its worthwhile to run a new PHH bypass hose when i have the rig under the knife??

 

[Pin_Head]

Run an OEM tube. The "bypass" also puts stress on the heater valve. Don't take chances with cooling loss.

 

[mypancreasbroke]

I bought my rig with the PHH bypass done already, had 264,000miles. However upon further inspection of the hose, I found it was rubbing quite alot on my intake manifold and the hose had worn thin in some spots, i quick fixed by zip tying some garden hose around the heater hose (all i had available on the cross Canada trip) it seems to be holding up very well so far protecting the PHH from further rubbing. Im going to be replacing the rad thermostat, rad hoses, and water pump in the spring (if my rad lasts till then *knock on wood*) any opinions on if its worthwhile to run a new PHH bypass hose when i have the rig under the knife??

I would say might as well. I just all new heater hoses as well as new heater valve as all mine looked original. Peace of mind is very nice (if ever really attainable)

 

[JM74]

Thanks for the replys. I kinda already have a somewhat serious problem with coolant lost with my rad leaking whenever i climb a hill for an extended period of time and then turn it the truck off (man does it piss coolant ). seems like the best idea, it seems logical to just replace it all now rather then have a something go later and have to drain all the coolant and refill, and the peace of mind is very nice too!! drove the truck across canada knowing it had a pretty severe rad leak, man was that nerve racking!!

 

[Rivman1243]

257K on the original phh on my Cruiser.

 

[paladek]

Most owners have more miles and are on the original HG. Why do you think it would fail so easily?

Is that a rhetorical question?....

It is almost a common knowledge that the original head-gasket in the 1FZ-FE engines were/are prone to early failure due to some unknown reasons.... (due to wrong OEM head gasket design or materials... rumors has it !!!???). Also is seems that the 1FZ-FE head is very prone to cracking and majority of time when the head is taken off for doing the head gasket job the head is found to be cracked...!!!???
In fact doing some search on this forum (and online....our friend Google....) turns out that there are quite a few of head gaskets failure and it seems that the majority of them occurred between 150K miles to 200K miles....with some odd ones as early as 75K !!!!????
The wrong design/material on the original Toyota head gasket hypothesis is substantiated by the fact that Toyota changed the PN for the engine valve grind kit (the kit used when the head gasket job is performed). The original PN was 0411266030 and it has been obsoleted and replaced by 0411266036. I don't know exactly when in time Mr.T did that....maybe somebody can dig this up...
Also the original OEM head gasket (PN: 1111566020) was obsoleted and replaced by 1111566031...

Had I done a better job in researching the facts regarding the 1FZ-FE engines before buying the LX....I would have never.......???!!! never mind ....it is too late now....???!!!

 

[peytonkristen]

I bought my rig with the PHH bypass done already, had 264,000miles. However upon further inspection of the hose, I found it was rubbing quite alot on my intake manifold and the hose had worn thin in some spots, i quick fixed by zip tying some garden hose around the heater hose (all i had available on the cross Canada trip) it seems to be holding up very well so far protecting the PHH from further rubbing. Im going to be replacing the rad thermostat, rad hoses, and water pump in the spring (if my rad lasts till then *knock on wood*) any opinions on if its worthwhile to run a new PHH bypass hose when i have the rig under the knife??

I ran my bypass hose straight out and away from the block, routed in a smooth curve up and around the brake booster and back to the heater valve.

Looking at your pic, I would be concerned about what is going on where the hose is connected to the nipple on the block. It has to have a 90 degree bend in it and possibly causing an interuption in the coolant flow. When installing mine I couldn't route it like yours without crimping it.

I'll try to post a pic of my bypass later this week.

 

[Bludozer]

Is that a rhetorical question?....

It is almost a common knowledge that the original head-gasket in the 1FZ-FE engines were/are prone to early failure due to some unknown reasons.... (due to wrong OEM head gasket design or materials... rumors has it !!!???). Also is seems that the 1FZ-FE head is very prone to cracking and majority of time when the head is taken off for doing the head gasket job the head is found to be cracked...!!!???
In fact doing some search on this forum (and online....our friend Google....) turns out that there are quite a few of head gaskets failure and it seems that the majority of them occurred between 150K miles to 200K miles....with some odd ones as early as 75K !!!!????
The wrong design/material on the original Toyota head gasket hypothesis is substantiated by the fact that Toyota changed the PN for the engine valve grind kit (the kit used when the head gasket job is performed). The original PN was 0411266030 and it has been obsoleted and replaced by 0411266036. I don't know exactly when in time Mr.T did that....maybe somebody can dig this up...
Also the original OEM head gasket (PN: 1111566020) was obsoleted and replaced by 1111566031...

Had I done a better job in researching the facts regarding the 1FZ-FE engines before buying the LX....I would have never.......???!!! never mind ....it is too late now....???!!!

Your post comes off incredibly erratic. Yes some people have had early HG failures, yes some 1FZ-FE's fail before 200k. There are also quite a few members on here with 300k on the original HG. I don't understand the shear panic over HG failures I see on here all the time; know the symptoms of it and be aware of how your engine is behaving. If you're really feeling anxious about it buy one of those chemical test kits, otherwise just fxxxing drive it. No need to constantly be anxious about it.

 

[ralphy1997]

For those that it has happened to, it's common. For those it hasn't happened to it's overblown (see what I did there?). I think it's luck of the draw and how many times your engine has overheated.

 

[Steve D]

My head gasket popped at about 250,000 miles/22 years. Who on earth could reasonably call that premature?

 

[Timpanogos Slim]

For those that it has happened to, it's common. For those it hasn't happened to it's overblown (see what I did there?). I think it's luck of the draw and how many times your engine has overheated.

There was a poll thread recently.

The vast majority of people who responded to it said they were still on the original hg.

 

[paladek]

Hi Bludozer...

otherwise just ****ing drive it

wellllll...not too many choices here isn't it?
Don't get me wrong I'm not blaming anybody except me for my stupidity in getting into this LX450 mess.....but as I said I'm just considering my options regarding my LX450 ...I will be dealing with the problem if/when happen....I'm just hopping I'll get rid of the truck before needing a head-gasket job....and if that's not possible I will most likely junk the truck or sell it for parts treating the whole experience with this LX as total loss of money and most important time....
Anyway...enough with me ranting.....


regards

 

[bmw635]

I removed the driver front wheel, trans dipstick to do fuel filter, phh, and starter pretty easy.