ROG100

We have had two situations where solid rubber motor mounts supplied by 928sRus have collapsed once the engine weight has been placed on them.

After further examination we have found that we have been supplied with a number of Hydraulic Motor Mounts not filled with water. This means that there is no substance to support the weight of the engine and due to the unfilled cavity the mount collapses on its self.
You cannot tell by shaking and listening for the sloshing sound as there is no water in them. They are actually heavier than the solids because of the metal supports and baffle.
I have attached pictures of both the hydraulic and solid for your information.

Not all the mounts are bad and our initial estimate is about 20%.
The last batch of MM's we purchased in February is suspect and we do know now how to determine which are bad and which are OK.

If you have not fitted MM's that you purchased please test them by pressing on them. If they are bad they will collapse. Contact us for replacement.

If they are fitted the situation is very obvious and you should have contacted us already.

We have returned the rogue units to the manufacturer and await their detailed response.

Sorry about the inconvenience this may cause but wanted to get the message out ASAP.

Lizard928

Thanks for posting this up right away Roger.
I have already informed my customer of the issue.

jeff spahn

How will I be able to tell if they are in the car already?

ROG100

Jeff,
It should be pretty obvious as the oil pan will be sitting on the cross member as with collapsed MM's.
You would also feel the vibration.
A visual check will be good so you have peace of mind.
Roger

Don Carter

Roger,

Appreciate the notice on this. The mounts I installed in Dec were a door prize from OCIC that I didn't actually win, but you were gracious enough to give to me when someone else didn't want them. I assumed they were solid since you seem to like the solid mounts better, but it sounds like you are selling both solid and liquid filled, and the problem is only with the liquid filled?

I'm wondering about my mounts since I still have a mysterious knocking/popping/grinding noise. I thought I had it fixed a couple of weeks ago but the noise came back and is getting worse. When I have looked at the mounts the didn't look collapsed, but I'll take a closer look soon. (Having a lift installed Monday!)

Edit: After re-reading your post, you said solid mounts had the problem because they weren't filled with water? So they were supposed to be solid, but were not?

jeff spahn

That would probably explain how low the oil pan appears and why the car feels like it is running rough.
Just my luck.

Landseer

Possible to have only one of two in a set.

Lizard928

Yes it is possible to be only 1. Of 2 being wrong.

ROG100

Don,
Just to be clear as you seem confused a little. We only sell solid rubber motor mounts not hydraulic.
We have been incorrectly supplied with hydraulic ones without any water in them. If you look at the pictures you will see that the hydraulic MM's have a large cavity inside and this is filled with a mixture of water and a little antifreeze. We have ordered solid MM's from the manufacturer and received hydraulic ones without water. If they were filled with water this would not be so bad initially but further down the road they would leak and collapse like the factory hydraulic ones.
We always test the MM's by shaking them as on one occasion about a year ago we received hydraulic instead of solid. When you shake them you can hear the water sloshing inside.
In this case because there is no water they sound (silent) and were cleared as solids.
The last batch we ordered (and the batch that we have a problem with) was delivered in February so I am not convinced that the ones I gave you are an issue. That batch was delivered in October/November 2009 and we would have know about issues by now.

The known bad MM's were delivered this year after February and both Colin (Lizard) and Sab in Florida brought the issue to my attention.

We buy Corteco MM’s as they do differentiate between solid and rubber by giving them different part numbers unlike the Anchor MM’s.

Please continue to let us know about any problems.

ROG100

It is very possible that one out of a pair could be bad so it is important to inspect both.
We now know how to distinguish between bad and good but only on close inspection with the MM in the hand.
On the car it would be impossible. The only way to tell is if the MM has collapsed as already covered.

Don Carter

Roger,

Thanks for the additional details, I was confused.

I'll take a closer look in a couple a days and let you know what I find. I agree it might not be the mounts but I haven't been able to find any other cause.

Calgary Ole

Don, drop your AC compresor, support it with a bucket or something and take a picture of your motor mount as a reference. If a mount has collapsped you will be able to see the engine tilting from above.
I have a couple similar pics we can compare with. I think it is something else, not your mounts but may be related with the procedure

Don Carter

Ole,

Dropping the compressor is a bit of a pain, but I may do it if I can't get a good view of them any other way.

Seems like the retaining hooks should tell the story also. If the mount is collapsed, the hooks should be further apart I would think. Mine are close for sure, so close I'm wondering if that's where the noise is coming from, the hooks contacting each other.

Calgary Ole

My car may be different but it took less than 30 min to remove my AC on Friday night, here is a pic of the motor mount. It shows a good angle of the mount and support bracket.
Just to be clear, I bought mine locally and not from Roger. Looks like they may have dropped a bit since new.

Don Carter

That's a good shot, thanks.

I think your car might be different. I know Donald's GT has a different compressor and it looked like it was easier to get to the bolts. Also since I just got the AC working again, kindof nervous about putting any stress on the hoses.