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Registered
Join Date: Dec 2000
Location: philadelphia, pa
Posts: 594
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Differential preload 915
When measuring differential preload is it the static breakaway torque reading or the to keep it moving dynamic torque reading, that is the spec?
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11-07-2014, 06:46 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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You're measuring it while it's turning. You need a dial or beam-type wrench. Clicker type doesn't let you see how much torque it takes to keep it turning
How-To: Porsche 915 Transmission Repair Tutorial Part 5 - Porsche Wiki
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Kevin L '86 Carrera "Larry" |
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11-07-2014, 07:30 AM
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Registered
Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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That's an excellent question (and answer) .. one that I haven't seen asked before on Pelican. The term "breakaway torque" can be misleading (just as a memory pointer can) for this particular job.
Same deal when measuring diff bearing preload. The pointer will always show a deceivingly higher value than true dynamic turning torque. The needle may bounce around initially while turning, but do it for awhile, and the mean value will become evident. |
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11-07-2014, 09:32 AM
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Registered
Join Date: Dec 2000
Location: philadelphia, pa
Posts: 594
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Thanks, I guess I need more preload. I need to get new bearings first and recheck. I am using a beam torque wrench. Startup torque was about 20 in lbs but running was only 5.
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11-07-2014, 10:18 AM
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Registered
Join Date: Feb 2003
Location: Kailua, Bend, & Tamarack
Posts: 1,618
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Ha ha .. I misread your initial post to say LSD breakaway. If you are measuring with used diff bearings, you may already be in the proper range.
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11-07-2014, 12:28 PM
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