Hole in bellhousing (ZF5) - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 3 (permalink) Old 07-29-2012, 01:09 PM Thread Starter
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ontwowheels's Avatar
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Location: Brockville, Ontario
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Hole in bellhousing (ZF5)

Just finished doing a pile of work to my truck to get it through safety inspection (new ujoints all around), and as soon as I got it back on the road and up to hiway speeds a vibration caused the rear driveshaft front ujoint to grenade. The ujoint is toast, and so is the piece that is bolted to the drive flange coming out of the t-case that conects too the ujoint. And there is now a softball size hole in the bellhousing right beneath the slave cylinder.

Could the vibration from the driveshaft have caused the bellhousing to blow out? There doesn't seem to be anything missing from the clutch system inside the bellhousing, and it doesn't make any sounds when the engine runs.

Has anyone ever heard of something like this before?

1996 F250 XLT, 4x4, 5 speed, LuK clutch, scsb, manual hub conversion, 265/75R16 Wrangler Territories, Tymar intake

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post #2 of 3 (permalink) Old 08-02-2012, 06:20 PM
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Re: Hole in bellhousing (ZF5)

I haven't heard of it happening with a manual before, but I imagine it is possible. My auto cracked the bell housing awhile back, and I've read ov several others also. Apparently it's driveline vibration that causes it. Usually from bad u-joints or engine / trans mounts.

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post #3 of 3 (permalink) Old 08-08-2012, 06:41 PM
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Re: Hole in bellhousing (ZF5)

Are you on the original clutch with the dual-mass flywheel? Just a WAG, but maybe the imbalance event caused the DMF to come apart, and thus grenade the tranny case. Have you inspected the flywheel as well as the clutch?

Or maybe the flywheel came apart first, causing the vibration that took out the u-joint and the t-case tailpiece.
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