valve covers ???
08-23-2015, 05:54 PM
#16
Burning Brakes
I'm getting a gearbox refresh so have the engine out in my garage and a bit of time to go over it. My '90 C4 has Magnesium valve covers, which are corroding. I'm doing a valve adjust and the first cover off has left a layer of Magnesium on the gasket. It's a false economy to put these back on.
Do we have a definitive recommendation that a particular replacement cover will work out of the box? I ask as I see some posts that the grooves are too deep in some brands meaning a skim has been done to allow the gaskets to properly seal. I just want to fit them, not have to visit a machine shop to adjust what are very expensive items.
Do we have a definitive recommendation that a particular replacement cover will work out of the box? I ask as I see some posts that the grooves are too deep in some brands meaning a skim has been done to allow the gaskets to properly seal. I just want to fit them, not have to visit a machine shop to adjust what are very expensive items.
08-26-2015, 12:38 PM
#17
Rennspeed
Has anyone used the rennspeed set? They seem fairly priced and thought I read a few decent reviews.... thoughts of anyone that has had them on their car for a bit and happy?
08-27-2015, 12:03 AM
#20
Rennlist Member
ally and a bargain... I have a set they are perfect, the lowers are the ones that corrode so change to ally.
http://www.ebay.co.uk/itm/Porsche-91...item5898d5517b
http://www.ebay.co.uk/itm/Porsche-91...item5898d5517b
08-27-2015, 08:48 AM
#21
Rennlist Member
I'm getting a gearbox refresh so have the engine out in my garage and a bit of time to go over it. My '90 C4 has Magnesium valve covers, which are corroding. I'm doing a valve adjust and the first cover off has left a layer of Magnesium on the gasket. It's a false economy to put these back on.
Do we have a definitive recommendation that a particular replacement cover will work out of the box? I ask as I see some posts that the grooves are too deep in some brands meaning a skim has been done to allow the gaskets to properly seal. I just want to fit them, not have to visit a machine shop to adjust what are very expensive items.
Do we have a definitive recommendation that a particular replacement cover will work out of the box? I ask as I see some posts that the grooves are too deep in some brands meaning a skim has been done to allow the gaskets to properly seal. I just want to fit them, not have to visit a machine shop to adjust what are very expensive items.
Do you have pictures of this. I am helping convert a local foundry here to do magnesium work. If it works out I am considering producing new versions of older magnesium parts. I don't think I have ever seen a mag casting leave material behind like you described would be interested in seeing what happened.
08-27-2015, 05:26 PM
#23
Rennlist Member
valve covers ???
I have one area corroded on the cover and a couple of areas of corrosion around the bolt holes. I believe the OPC used some type of sealer on the gaskets and they have picked up some of the corroded material.
08-28-2015, 05:06 PM
#25
Rennlist Member
BTW I have yet to get the driver seat out of the car to photograph. The rear inner bolt is cross threaded so I have to cut the head off. Mechanical ineptitude with cross threading is starting to drive me nuts. A cardinal sin. Rant over.
08-28-2015, 05:18 PM
#26
Rennlist Member
Just as an aside, a former Turbo 3.6 owner took these off his car a decade ago. He offered them to me for a bottle of cognac, but unfortunately they don't seem to fit a C4
08-28-2015, 09:31 PM
#28
Instructor
not trying to be a smart*ss but are you replacing them because they leak or they're just not "pretty"?
if they leak it could just be time for new gaskets and need to be tighten down in a specific sequence. hell mine look worse than yours and are warped but don't leak, I don't care what they look like the garage floor is dry. gaskets are a heck of a lot cheaper than new covers..just a thought
if they leak it could just be time for new gaskets and need to be tighten down in a specific sequence. hell mine look worse than yours and are warped but don't leak, I don't care what they look like the garage floor is dry. gaskets are a heck of a lot cheaper than new covers..just a thought
08-28-2015, 09:48 PM
#29
Rennlist Member
not trying to be a smart*ss but are you replacing them because they leak or they're just not "pretty"?
if they leak it could just be time for new gaskets and need to be tighten down in a specific sequence. hell mine look worse than yours and are warped but don't leak, I don't care what they look like the garage floor is dry. gaskets are a heck of a lot cheaper than new covers..just a thought
if they leak it could just be time for new gaskets and need to be tighten down in a specific sequence. hell mine look worse than yours and are warped but don't leak, I don't care what they look like the garage floor is dry. gaskets are a heck of a lot cheaper than new covers..just a thought
So for $225 I will not have to worry about paint peeling on the inside of the motor, it will visually looks better, and it might solve an oil leak. Also, I really enjoy working on the car.
Mike
Chunks of paint will get in to oil lines and plug tiny oiling holes causing not pretty after effects 