Here is another fix that should be manditory to do every 100K miles (just like a PD replacement).

How many times have you (or your mechanic) spilled a little oil when filling/addding oil to your car?

How many times have you (or your mechanic) spilled some oil when changing an oil filter?

Well in either case, the oil drips onto a hose for the heater just below the oil fill/filter area. This hose runs from the heater to the block just under the filter area, and next to the rear rotor spark plugs.

After a while this hose becomes swollen with the oil drops (even if you clean it off after dropping oil on it). When the hose gets swollen enough, it bursts.

Note the older hose on the left. It still looks clean and perfect from the outside, but looking at it you can see how much more swollen and ready to burst, when compared to the new hose on the right.

The old hose here has only 70K miles on it, but oil has seeped in and wasted it.


Loose this hose while driving and you loose your motor as all the coolant dumps to the ground.

 

Ok, what's the Mazda part number for that one?

BTW, I have a 1991 N/A...

Doesn't your pocket book just love preventative maintenance?

 

replaced all mine

 

already broke on me once few years back while driving with guys from Atlanta, on the road fix (if there is other car which u could get somewhere to store get hose and clamps and new coolant

 

Haha, kinda like me driving my Turbo2 home from Massachusetts, and the upper rad hose bursting on me somewhere in Connecticut. Nothing like being hundreds of miles from home fixing a car on the side of the road at night. Good thing I loaded up with tools/oil, and coolant

 

Already knew about that one from first hand experience.
The thing sprung a leak luckily as I got off the highway. The car hit H for a second and I shut her down.

Just one of the suspect in my eventual coolant seal rupture.

Just stop by the Mazda dealer ship and tell them you need the engine to Firewall coolant line which is on the drivers side.

I plan to put some wire loom over mine to help deter oil from getting on it. I also do not fill up the oil filter with some oil when installing. Stupid downward filter

I think this is more of a problem with NA's over TII's since the oil tube is a straight dropdown and is more likely to spill when filling up.

My TII engine is so damn easy. A blind midget with parkinsons(Sp?) could pour it in without spilling

 

yeah spilling while filling is more a non turbo thing, but a leaking oil filter stand, or removing the oil filter without popping a hole in it and it's pretty easy to spill on that line.

 

my lower rad hose popped on me on my 4th day of ownership.
and that's with ~90k miles!

good thing it popped when I was parked

 

I though the FSM says all coolant hoses should be changed every 30/50K miles ?

 

Nope just the fluids including coolant. Nothing about hoses.

 

Is this a standard hose I can pick up at a local store, or should I find a part number through mazda? Im sure my car could use it.

 

I agree. It's not the spills from filling that cause this, it's the leaky o-rings from under the oil filter that cause the constant oil drip onto this hose.

I always replace this hose everytime I work on someones car... mandatory.

 

Those O rings were one of the culprits on mine.

So how about at 100k You should ...
Replace Oil Pedastal O rings(2) and the Rear iron to Firewall coolant hose.

The Orings are really easy to replace.
Just get a 10mm wrench and remove the 2 nuts underneath.

 

when you replace the hose (or if the one on the car is in GOOD shape), get some black RTV silicone from the auto parts place, and apply a thin layer over the first 4-5" of hose (engine side)...the silicone will keep the oil, etc off the hose, takes the heat, and expands with the hose...no more oil soaked hose problems...

 

Great Sug. man. Thanks alot!
(will do wonders in my '71 GMC p/u)
|M|

 

Good public notice. On my previous FC, that hose developed a pinprick leak... I was lucky it didn't burst.

I replaced all the heater and radiator hoses on my current FC before I even drove it home.

 

What is PD? Search is not working right now.

 

personally i think all of the main hoses should be replaced at 60k not 100k but that is just me, the exception being the accelerated warmup hoses which do not tend to burst as often and are less prone to damaging the engine as easily since they don't leak as fast compared to the heater hose or radiator hoses if they burst.

 

Pulsation damper. It's a failure-prone part that needs replacement on most FC's these days.
You mean the two short accelerated warm-up solenoid valve hoses? I haven't heard of them failing at all, considering they are just air hoses (unlike the critical heater hoses, rad hoses, and oil cooler lines)

 

I cant speak for TII's but the 13bT JDM I got does not have one. But my USDM N/A does. Is it an N/A only part?

 

No, Turbos have them from the factory also.

 

In the FSM, it CLEARLY says that, under normal driving conditions, all cooling system hoses, should be inspected for cracks or wear, at 15k mile intervals.

This is the part where I explain how this thread is useless, since ICEMARK has already told everyone who has posted a question, TO GO READ THE FSM.

***FYI***

I change ALL my coolant hoses at 15K intervals, NO MATTER WHAT CONDITION THEY ARE IN.

 

I will just add that I blew this hose on my TII one night when my foot was WOT. It made quite a mess. I shut down right away. Lucky it blew right at the end, so I could shove it back on there with the rest of the hose, clamp it down and drive home. (Of course filling the system again.)

Then of course I bought the new hose from mazda the next day. I just wanted to get home.

 

I find this a very helpful reminder, because most people are not going to go around reading through the entire FSM for fun. I just use it to look up stuff I need. Either way, I'm not going to go around replacing my hoses every 15k, but replacing this hose seems a reasonably good idea, so I'm going to go do it.

 

what size is the hose? Could I just get a length of hose cut off from advance auto? I should do this while replacing my engine this week.