Superformance Questions

[Blas]

If you contact me off line I can give you some guidance.
Blas

[sunman]

What’s up with the discoloration and crud on the tank sealing lip?
How’s the cap rubber look?

[BlkGoldCobra]

Originally Posted by sunman

What’s up with the discoloration and crud on the tank sealing lip?
How’s the cap rubber look?

Here is an image of the underside of the cap. Looks pretty normal to me.
Could the tank of been too full and that caused it to spew out the top?

[patrickt]

Originally Posted by BlkGoldCobra

Could the tank of been too full and that caused it to spew out the top?Attachment 39736

Possibly, but it should be squirting out your hose not from out around the cap. When I flush my coolant I always fill my expansion tank up about two or more inches and then on the first ride it fills up my catch bottle. My catch bottle is nothing fancy but that's how your coolant system finds its right level.

[IMG][/IMG]

[sunman]

I suggest you look closer at the cap rubber seal
It looks like it is compressed at contact area and maybe cracked
Maybe it’s just the photo but
Put On A New Cap First

[cycleguy55]

Originally Posted by sunman

I suggest you look closer at the cap rubber seal
It looks like it is compressed at contact area and maybe cracked
Maybe it’s just the photo but
Put On A New Cap First

Agreed. When I zoom in on that image it appears the lower seal is in rough shape and unlikely to properly seal against the expansion tank.

The bigger problem and the likely culprit of the coolant leak, however, is the upper seal. Look closely at the bottom part of it in the photo - it looks like it's torn and may have even folded over a bit when previously installed. That won't seal and will allow expanding coolant to leak. If that seal isn't leaking all the extra coolant should flow out the hose, not past the seal and over the expansion tank.

[Mark IV]

Originally Posted by cycleguy55

Agreed. When I zoom in on that image it appears the lower seal is in rough shape and unlikely to properly seal against the expansion tank.

The bigger problem and the likely culprit of the coolant leak, however, is the upper seal. Look closely at the bottom part of it in the photo - it looks like it's torn and may have even folded over a bit when previously installed. That won't seal and will allow expanding coolant to leak. If that seal isn't leaking all the extra coolant should flow out the hose, not past the seal and over the expansion tank.

Also, I suggest having a new cap pressure tested. We found 25% of a certain brand 13# caps we tested were actually between 8-11 pounds.

[cycleguy55]

Originally Posted by BlkGoldCobra

Here is an image of the underside of the cap. Looks pretty normal to me.
Could the tank of been too full and that caused it to spew out the top?Attachment 39736

Yes, the coolant level could have been too high and spewed out when it expanded. It's called an 'expansion tank' for good reason. As noted by patrickt, the coolant will find it's own 'proper level' - and unless it was in an overheated state when it spewed, it may already be at that proper level.

Coolant is visible in the photos, but I can't really tell at what level. Unless it's significantly below the halfway point in the expansion tank I'd leave it alone.

If you need to add more, Prestone Universal s/b okay, IMO.