[DeTomaso] Correct Throwout Bearing Clearance
Larry Stock
larrys at panteraparts.com
Wed Feb 14 14:00:27 EST 2024
AMEN
On 2/14/24, 10:56 AM, "Mike Drew" <mikeldrew at aol.com <mailto:mikeldrew at aol.com>> wrote:
Larry,
Having put one of those units in my car back in 1993 because that’s what all the cool kids were doing, I would NEVER do it again for the reasons you mentioned.
Mine has proven to be unusually reliable, failing catastropically once at the Reno Fun Rally. McLeod could not have been better about it. Instead of just replacing the seal, they upgraded it to a completely new and improved design and it has worked fine since.
Letting them sit unused is also very bad for them. Drive your car!
So while my experience has arguably been almost exclusively terrific, the stock system is still better IMHO.
Mike
Sent from my iPhone
> On Feb 14, 2024, at 09:29, Larry Stock <larrys at panteraparts.com <mailto:larrys at panteraparts.com>> wrote:
>
> These Hydraulic throw out bearings work great in most applications with the new well ventilated QuickTime bellhousings used in the GT-40 applications but so well with the stock DeTomaso bellhousing, especially if you close off the only ventilation hole with that stupid Hall Urethane Bellhousing cover. The DeTomaso Bellhousing being as compact as it is has been the source for all our clutch, ZF Synchro wear, and release adjustment problems.
>
> These Hydraulic throw out bearings fail when the temperatures inside the bellhousing exceed the seal melt temperature, thus the seal fails. McLeod and others have been super good with quick extended warranty replacements of these seals, but the untimely removal, shipping and replacement, just isn't worth it in my opinion. Those in cooler climates rarely encounter these problems, but they come out as fast as they go in in the southern AZ temperature zones.
> Larry Stock
>
> On 2/13/24, 10:21 PM, "DeTomaso on behalf of Larry Finch via DeTomaso" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> <mailto:detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com>> on behalf of detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com> <mailto:detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com>>> wrote:
>
>
> Mike,
>
>
> I think you’re on the right track, though following your descriptive terms had me lost somewhere around the fork in the road to Burbank.
>
>
> The critical point in taking your measurements is the interface junction between the bellhousing and the ZF case. Note the junction is M/F in design, but as long as you stay with the same junction point for both measurements, you will be fine.
>
>
> You need the steel engine plate, flywheel, clutch disk, pressure plate, and bellhousing all bolted together,
> installed on the engine block.
>
>
> You now climb into the engine bay, and with whatever assorted straight edges and calipers you can assemble, measure from your chosen junction point to your clutch fingers. Try to do each finger in the same manner, and I always do at least two measurement sets, averaging to minimize errors.
>
>
> Then, with the ZF ideally positioned on your workbench, measure from the face of your TOB to the same junction point on the ZF case. You will find the throw out bearing wants to wobble which makes consistent measurements difficult. After years of various methods, my latest is several wraps of duct tape around the ZF snout and a 4 inch piece of a pool noodle slid onto the snout; it actually holds the TOB in place pretty nicely. Do the best you can, again taking several sets and then averaging.
>
>
> As the clutch gets thinner with use the fingers move closer to the throwout bearing. So in theory one might want a larger gap to accommodate long-term clutch wear. Because of the difficulty I find in getting precise measurements, my target is always 0.125” clearance. That gives me a safety margin in both directions.
>
>
> Good luck.
>
>
> Larry
>
>
>
>
>
>
>
>
>
>
>
>
> Sent from me using a magic, handheld electronic gizmo. _______________________________________________
>
>
>
>
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
> DeTomaso mailing list
> DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com> <mailto:DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com>>
> http://server.detomasolist.com/mailman/listinfo/detomaso <http://server.detomasolist.com/mailman/listinfo/detomaso> <http://server.detomasolist.com/mailman/listinfo/detomaso> <http://server.detomasolist.com/mailman/listinfo/detomaso>>
>
>
> To manage your subscription (change email address, unsubscribe, etc.) use the links above.
>
>
> Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.
>
>
> _______________________________________________
>
>
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
> DeTomaso mailing list
> DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com>
> http://server.detomasolist.com/mailman/listinfo/detomaso <http://server.detomasolist.com/mailman/listinfo/detomaso>
>
> To manage your subscription (change email address, unsubscribe, etc.) use the links above.
>
> Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.
More information about the DeTomaso
mailing list