Thanks for insight. With initial failure, I hadn't touched the threads other than partialy threading in the bolts during assembly. Before testing the second bolt hole, I did run a tap through, but it ran through easily - no cutting.
My post that has been deleted had recommended torque for different quality bolts. Of course the mounts threads need to be of similar quality. I tonight finished installation using 3/8 bolts. I used the recommended torque for low grade 2 bolts. About 144 in.lbs. Used blue Loctite to stop.them from falling out

CENSORSHIP
How did you know I used a Powerfist wrench?

I do know where you got that info, but the post in which I described how I tested your mount and provided allowable torques for different qualities of bolt/thread material was deleted. I took some time taking those pictures and gathering the torque data. I am annoyed that it was deleted.

Was this deletion because it showed URO in a bad light? Did you ask for that to be done?

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Where would the post haven been that got deleted? I will investigate.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

It was right here. It was likely post #10 before it was deleted.

I quoted from it in current post #10.

URO referred to it as post #10 in current post #12 (they refer to the Princess wrench pictured in the now deleted picture I posted).

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

URO = junk. No matter what their sales guys say. Rare to find anything they sell that is comparable to OE MB.

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Why I will never do business with "DieselKraut" again

http://www.peachparts.com/shopforum/mercedes-benz-used-parts-sale-wanted/378935-why-i-will-never-do-business-dieselkraut-again.html

The W123 manual in this link says the torque on the M8 bolts should be 25Nm (18.43 ft.lb)..

However, in this section, it says 30Nm (22.1 ft.lb).

So MB are not consistent.

These are of course with OEM mounts. With aftermarket mounts made of unknown quality of steel and perhaps poorly formed threads, torque that won't deform threads is anybody's guess. I used about 12 ft.lb (17Nm) with URO mount after drilling out stripped threads and re-tapping to 3/8-16, just to get car back on road.

Frank's post earlier re formed vs cut threads was interesting. I researched that a bit. There are different classes of formed threads that are chosen depending on the intended use. It is hard to imagine that a company like URO would have paid enough attention to this and made sure that the class of fit of the mount was equivalent to that of the M8 bolts MB used for the mount.

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Strange. There are posts missing that I have email notifications for.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

Hi Frank, our photo shows the mount threads being tested with $445 Snap-On torque wrench QD2FR75B, which was torque-tested by Snap-On in December and found to be extremely accurate (within .5 ft-lbs). Curious why an untested, semi-generic $25 MSRP torque wrench would be a better tool than a calibrated Snap-On for accurately checking yield torque?

Hi Graham, your post #10 said you set your torque wrench to 22 ft-lbs (and included an excellent close-up photo of the torque setting) when the threads on the second hole stripped. The math: The calibrated Snap-On wrench shows the threads in these mounts yield at 32 ft-lbs. The Powerfist wrench set to "22 ft-lbs" stripped the threads. If a Powerfist wrench set to 22 ft-lbs stripped threads known to actually yield at 32 ft-lbs, the Powerfist inaccuracy is at least 50%. The inaccuracy could actually be substantially more than 50%, but there's no way to know without a proper testing device.

That is an excellent question. We replied to post #10 at 3:28pm on 7/28. The forum shows you edited your post #10 forty-seven minutes later at 4:15pm. Our response to your post #10 isn't very helpful without the context and photos that are now missing from post #10.

From your photo showing the Powerfist branding laser-marked on the side of the torque wrench.

We certainly didn't have anything deleted, that information is absolutely needed to give context to this thread. Please edit the missing torque data and photos of torque settings back into post #10, as well as repost the now-deleted post showing your testing. It is indeed strange that only certain details disappeared. Should we check with the forum admin regarding who made the edits and deletions, or let it be?

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Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs
URO Parts online catalog: https://apaindustries.com/catalog

The "test" as put forward by URO is not valid. To have any validity at all would require that the tightening of a fastener in the threaded hole of the mount be done with both torque wrenches in the same part one after the other. The customer's part was in Canada, the URO example in California(?). The comparison sequence would involve increasing the wrench settings in 1 lb. increments, and alternating wrenches until failure of the threads occurred. To determine a statistically meaningful thread failure value, the sequence would require 15-20 trials.

The tone of the responses from URO is both defensive and insulting to the customer; insulting in that those responses are dismissive of any of the customer's explanations of his procedures and of his quantitative assessment of forces applied.

A master class on the part of URO on how to win friends and influence people.

Hi Frank,

• As of today, we've sold 1,773 of these mounts without a single complaint or Am@zon review mentioning that the threads strip at Mercedes' recommended torque.
• Calibrated testing of several units shows a yield torque of 32 ft-lbs, which is ~50% higher than the factory spec.
• Despite the above facts, we're shipping Graham a replacement at no charge (to Canada, which means costly shipping).
• Graham is certainly welcome to ship his torque wrench to us for comparison.

Please advise how we should handle this better.

__________________
Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs
URO Parts online catalog: https://apaindustries.com/catalog

Drew, you are digging yourself an even bigger hole by posting more mis-information.

First of all, the threads stripped when I was just screwing the bolts in with a short ratchet wrench, not the torque wrench. I have told you this before. The other owner I posted about had same experience: https://www.benzworld.org/threads/transmission-mount-not-uro-how-about-febi-or-meyle.2521537/

My collection of torque wrenches may not be Snap-Ons, but the 3/8 I used does not have an MSRP of $25.00. This is just another example of you making up information to try and cover the mount quality issue that at least one other owner has had (and I posted about).

https://www.princessauto.com/en/3-8-in-dr-click-type-torque-wrench/product/PA0002920935

It is common knowlege amongst DIYers that URO products are not of high quality. We buy them sometime just because they are the only parts available or because OE parts are priced so high they make no sense for our old cars.

Why not just accept that there is a quality issue rather than try and make out that experienced owners like Frank, other here and myself are somehow wrong in our judgement. Your posts here will likely drive even more potential customers away from URO products.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Hi Graham, the torque wrench that was in your now-deleted photos didn't have a black handle, curious why you posted a link to that one since it's clearly not the same as yours. The silver-handle wrench in your photos looked exactly like this one: https://www.princessauto.com/en/3-8-in-dr-click-type-torque-wrench/product/PA0008533192

We'll just have to agree to disagree about what's going on here, and leave it at that.

__________________
Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs
URO Parts online catalog: https://apaindustries.com/catalog

So you determined the brand and price of torque wrench by the color of the handle. Amazing! In fact, the handle of my wrench is black, not silver. Again, you are making stuff up.
Here is the only picture I posted that showed the handle:


The sku of my wrench is 2920935. The one that costs $59.95 at Princess Auto. Here is another picture confirming your mis-information:


It would clearly be in your best interest to "leave it at that" . Every time you post the hole you dig with misinformation gets even deeper

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

^ We certainly stand corrected. Based on the dark photo of the torque digits, the handle looked silver.

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Event Video: Cars & Coffee 2023, Simi Valley CA: https://youtu.be/CFfY9CPVuEs
URO Parts online catalog: https://apaindustries.com/catalog

Did you find out anything? Very odd that my complete post that was here long enough to be read and commented on all of a sudden disappeared. I tried PMing via the contact link at the bottom of the page, but received no reply.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5