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#4071864 - 07/25/20 11:41 AM Odd heat at both rear tires after seal and bearing
Brett04 Offline
n00b

Registered: 09/17/13
Posts: 23
Loc: Southern PA
On my 2004 CVPI, on the front-end, I just replaced upper and lower ball joints, sway-bar bushings, stabilizer-bar links, brake rotors, and pads. On the rear I replaced the pinion seal, wheel bearings and seals, and gear oil. In between, I replaced the u-joints, and the tail-shaft seal of the transmission.

The test drive seemed fine (no vibrations, odd noises, etc.).

I used the car yesterday. When I got home, and stopped to get the mail from my mailbox, I reached out of the driver’s window, and noticed a lot of heat coming up from the bottom of the car. When I parked, I found that the rear tires were noticeably hotter than the front tires. The wheels were warmer too. They weren’t untouchable — just noticeably warmer than the front. There was a lot of heat coming out from the rear wheel wells. I was really tired, and didn’t think of using the infrared thermometer until things had cooled down a bit. At that time the differential cover was reading about 120 F.

I know that the exhaust pipes run right next to the wheel wells. I tried to convince myself that I was just not used to this car (as it had been in my shop for over a month), but I have a nagging feeling that something that I did is causing too much friction.

When replacing the pinion seal, I made alignment marks, and the nut is exactly where it was prior to removal.

I plan on putting it back on stands this evening. I was going to check the gear-oil level (though it took the correct amount, and I saw no leaks), and I’ll check the ease with which everything is turning. Is there anything else I should be checking?

In the differential, I used Valvoline SynPower 75W140, full-synthetic gear oil. It contains an additive for limited-slip differentials.
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2004 CVPI

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#4071868 - 07/25/20 12:02 PM Re: Odd heat at both rear tires after seal and bearing [Re: Brett04]
metalpanther Offline
n00b

Registered: 12/02/17
Posts: 43
Loc: USA
Interesting. I'd go for another drive and see if I could recreate the situation. Take the IR with you.
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2005 P71

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#4071880 - 07/25/20 01:26 PM Re: Odd heat at both rear tires after seal and bearing [Re: Brett04]
gDMJoe Offline


Poobah

Registered: 06/03/03
Posts: 7686
Loc: Timbuk3, MI
Check that the rear brakes and/or parking brakes are stuck or hanging-up.
.
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-click the Vic-

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#4072858 - 08/03/20 08:49 PM Re: Odd heat at both rear tires after seal and bearing [Re: Brett04]
Brett04 Offline
n00b

Registered: 09/17/13
Posts: 23
Loc: Southern PA
I checked the brakes as suggested by gDMJoe. They are not hanging up. All components are turning freely.

I took it out for a short drive tonight (maybe 20 minutes at various speeds, including highway speeds) with the IR Thermometer, as suggested by metalpanther.

The outside air temperature was about 70° F. After the drive, the front of the differential (right around where the pinion bearing is located) was reading about 145°. The cover on the back was reading around 130°.

How hot is too hot for a differential?
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2004 CVPI

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