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Re: Pinion and rear end gear temp.
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Home away from home
 
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Transmissions also generate heat, and they will pick up a lot of heat from the engine.
I have gotten away with tightening a slightly loose (Ford) pinion shaft, since doing that further crushes the sleeve, but once it is crushed, it will not return to its previous condition if for any reason the adjustment is loosened. If you need to loosen the adjustment, you'll need a new sleeve. It's best to use a new sleeve anytime an adjustment is needed. It's important not to over tighten when making adjustments. The sleeve can crush, but it cannot rebound.
Posted on: 8/1 13:12
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Re: Pinion and rear end gear temp.
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Not too shy to talk
 
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Quote:
UPDATE - Drove the car approx 20 miles with speeds ranging from 45 -60 MPH. I stopped 3 times to take a temp at the pinion housing. Temps ranged from 125F up to 147F. Ambient temp for the day was about 90F. Based on a few other people I have spoke to offline - I feel that is a typical/normal temp range to have. No noise, no hum, no rattle detected. I'm sure I will be super vigilant over the next few drives just to make sure I'm ok.
Posted on: Today 13:35
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Re: Pinion and rear end gear temp.
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Home away from home
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Interesting to note that the coefficient of expansion for steel is perhaps one microinch per inch degree F more than cast iron, and the wheel bearing endplay is 4 to 7 thou. For a rear axle heated 50F above ambient, the expansion of the steel axles compared to the cast iron case would be approx. 4 thou.
Posted on: Today 13:42
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Pinion and rear end gear temp.
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Home away from home
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Wouldn't the axle spines allow for any expansion? In the case of the pinion shaft, I assume the specs allow for expansion. Rough bearings or an overly tight initial setup could lead to trouble.
Posted on: Today 15:14
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Re: Pinion and rear end gear temp.
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Home away from home
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"Temps ranged from 125F up to 147F. Ambient temp for the day was about 90F..."
I believe you're well within the normal temperature range for the conditions you describe. No harm in keeping an eye on it, but it looks like you're OK.
Posted on: Today 15:17
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Re: Pinion and rear end gear temp.
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Home away from home
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90 F air temperature on a sunny day might result in over 100F at pavement level, especially with light winds. The temperature under the car would be substantially higher due to engine heat flowing beneath the car. I'd guess that your actual axle temperature rise above ambient is less than the difference between the ambient air temperature and the reading at the axle due to the fact that the air under the moving car is a good deal hotter than the ambient air temperature. I've measured bare ground and concrete temperatures here well over 120F on hot afternoons. I've seen as high as 137F on dry bare ground. Dark asphalt can get VERY hot on summer afternoons. I've seen it actually bubble.
Posted on: Today 15:25
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