Just thought I would pass along some info on the valve covers I have been working on of late.
I have pictured what a tired 911 3.oL long block looks like BEFORE any cleaning has been completed.
The valve covers on the engine.
The valve covers on the plywood from left to right:
930 lower covers, mag uppers in tank, tumbled mag upper, mag in tank, tumbled mag upper, tumbled alum upper, tumbled alum upper. ALL covers have Shark Hyde protectant applied and it is great stuff!!!!!!!!!!!!!
What I did & learned:
1. all parts were tumbled in vibrator~tumbler of ceramic cones then corn cob.
2. mag uppers went in clean solution solvent tank to remove any residue for about 1 wk (I forgot/couldn't get to them till today) they will need to be corn cobbed again as they have oxidized again! in the solvent!!
3. notice how the mag covers are alot more shiney than the alum covers.
4. mag valve covers weigh 1/2 of alum covers weight.
5. during this surface treatment process, 2 lower covers broke off corners and will have to be chocked up to experience. My guess is the tumbling process will work on any areas that are weak to begin with, so I am glad to know this now, I guess.
6. The Shark Hyde protectant applied just as the can says. I did notice that during this week of 2 covers in the tank and the others in a box waiting for me to get to them all, that the covers in the box had already started to show a light ghosty film on the surface. I am glad to have caught them now than later and they would need tumbling again.
Clint @ Shark Hyde, great guy and very informative, tel # 618.624.4091, he even answered his phone today and his shop is closed, says that these parts will stay looking as pictured for years. I expect they will be on the shelf for a while so time will tell on that. Then, when put on the engine, they will be easy to maintain by removing oil..., wipe on new Shark Hyde if needed and done! Sometimes the SH will need to be wiped down with solvent and then re-apply SH which takes 2 min. A heck of a lot better than what I have gone through in time and $$ to get them in this shape.
Someone said that SHyde also works great on Fuchs. I think it was a pelican from Hawaii. If you or whomever, thanks for the great tip on this product!!
There you go pelicans!!
Bob