Hi everyone,

EBS is my machine shop, and they have been very responsive and helpful. They sell sets of these exact bearings every day and haven't had issues from customers for awhile. They will either send another set to me, or I can upgrade to Clevite 77. Leaning toward the Clevites. I promised myself I would be mindful of slippery slope, but alas, here we are. On the forums, of course you only hear about the instances of quality problems. You don't hear about the 100's of sets sold every year of Glyco's that work just fine. If there were any builders that use or have used Glyco bearings made in S. Africa, it would be great if you mentioned it...

As a note, I did go ahead and install the original bearings, and they line up perfectly. Never mind the scratches. they have been all floating around in a ziplock bag.

http://forums.pelicanparts.com/uploa...1547667195.jpg

I had to go with clevite rod bearings on my last two builds (3.6 and 2.4) as the clyco bearings originally ordered had issues. don't remember where they were made. mains were fine.

john

Do not install any third world glyco branded bearing unless you have the ability to do a full fitment and quality check. If you're not able to use a bore gauge and really check them for clearance you're doing yourself a disservice trying to save a few bucks. The OEM Porsche branded shells have never been associated with quality debacles, and you can actually see marks on them where they have been through some quality control process. From a quick check it looks like you could get a set of 6 from my local dealer for $250. Well worth the increase when compared to the known quality problems of the low end parts.

It's good that you've narrowed down the smoking gun...

I posted a bunch of various bearing pictures in this thread.

http://forums.pelicanparts.com/911-engine-rebuilding-forum/825748-rod-bearing-controversy.html

The quality control check marks that smokintr6 refers to are in post #75

http://forums.pelicanparts.com/911-engine-rebuilding-forum/825748-rod-bearing-controversy-2.html#post8286903

My new #8 was so out of spec on the ID you could drive a Mack truck through it. Ended up coating the in-spec used bearing.

So, Danner
You have concluded that the issue was bad dimensions on your first set of replacement bearings? Because the old ones lined up as they should?

Hi Walt,

I didn't measure any dimensions as there was a major issue with the alignment of the non tang ends. I'd really be curious to know how they are manufactured. Three sets all exhibited the same phenomenon.

I am going to go with Clevite 77. Can only assume the issue will go away. Will update the thread when complete.

Thx

Did you try 3 sets of Glycos? Or were there other brands tried?

I got a set of Glyco GT3 rod bearings (coated, made in germany), and was really pleased with the thickness measurements. They were consistent and within spec to .0001. I was really impressed.

But!!!! I went back and looked for misalignment of the shells as pictured in this thread and find the same thing with mine. To make matters more interesting the Glycos I took out were from 2002 and they have exactly the same width measurement - 17.6mm. Same amount of misalignment.

The shell is approximately 1.15-1.25mm too narrow. From what I can tell by measuring the bearing shell width should be about 18.75mm.

I could not find any specs in any book about bearing shell width, only rod/journal width (22mm nominally).

For what it's worth the bearings that came out of the motor look great, even though the misalignment is there.

So the big question is, does it matter? Why is this happening? If Glyco is making GT3 bearings for Porsche are they similarly narrow? I bought these Glyco GT3 bearings to measure them for size but I guess they are going back, but will the genuine GT3 bearings be any better or different?

Pics
 

Pictures to go with above post
http://forums.pelicanparts.com/uploa...1548874842.jpg
http://forums.pelicanparts.com/uploa...1548874842.jpg
http://forums.pelicanparts.com/uploa...1548874842.jpg
http://forums.pelicanparts.com/uploa...1548874842.jpg
http://forums.pelicanparts.com/uploa...1548874842.jpg

I am NO EXPERT, but this bearing package does NOT say they are for a 3.2L engine, correct me if I am wrong.
From the picture, I do not see 3.2L listed. It starts with 3.3L, 3.4L, etc., etc..

Hope this helps. Good luckSmileWavy

I measured the Glyco mains tonight, and they also seem well made, bus alas they are .0004" to .0006" thinner. Adding .0008 to .0012" to my bearing clearance is not part of the plan.....

They are getting sent back as well.

Try the mains from the dealer.... NOT cheap, but I'd bet they'll be in spec.

3.2 and 3.3 share the same journals as they are virtually the same engine on the low end.

I measured some 3.0 SC and GT3 rod bearing shells for Jonny042. The three pairs of shells pictured below are, left to right:

http://forums.pelicanparts.com/uploa...1549132573.jpg

• Aftermarket Glyco SC (like red boxes pictured elsewhere in this thread) with 10-12 date code and a box sticker made in S Africa,
• Aftermarket Glyco red box GT3 "R” bearings (no date code I can see, not even on box decals) made in Germany
• OEM Porsche GT3 (996.103.121.94) bearings I got from a Porsche dealer. No date code on them bearings but do have 99612194 number (no zeros) and the einmalig triangle on the back. They also have the QC tick marks on them in six places each where you can see they were measured for QC/QA

The measured width of all are the same. All measure between 0.793” - 0.794” = 20.14mm - 20.17mm. Edit: NOPE, that's incorrect. I read the dial calipers wrong. I should have said 0.693" to 0.694" = 17.60mm to 17.63mm. See post #81 for my correction

http://forums.pelicanparts.com/911-engine-rebuilding-forum/1017939-rod-bearing-alignment-edges-off-3.html#post10372061

I placed each pair in an SC rod and they all line up evenly in the rod. Sorry I didn't take a picture of the bearing alignment in the rod but you can trust me on this.

Unfortunately I haven't yet put them in any rods to check them for bearing clearance against my crankshaft. That engine ain't getting built any time soon so that's why I don't have those numbers. Sorry..... :(

Thanks again, Kevin. This is a big help. It's shocking to me that both the bearings I removed and the new ones I bought are supposed to fit the SC rods/crank but are "off" by that much. At this point my only option is to order the same GT3 part number 99612194 from the dealer and be done with it. For the rods, at least.

Mains are a different story....

Here's a picture of the issue from a different angle:

http://forums.pelicanparts.com/uploa...1549298723.jpg

There's a good 14% difference in bearing area due to the width difference, not to mention the force would not be centered along the middle of the journal, causing some side loading. Of course the bearings pictured were installed in 2002 or so and only had maybe 10,000km on them but still.

Glad to help and sorry to see your difficulties. I agree it doesn't make sense why the bearing width would be off. Seems like a manufacturing mistake. Once again Glyco aftermarket shows big quality decline?

I would say so. I wonder who makes the GT3 bearings (these days)? I'm thinking of ordering a pair of shells to see how they look before committing to the whole 12.

I bought my shells one each (not pairs) at the dealer network. So you can buy just one if you want to do that for investigative/reconnaissance purposes

I figured I'll get a pair so I can throw them in a rod and easily check for sizing with the bore gauge. I found them for $20/half-shell so that's actually not too bad.