KLR

I've read in several places that these two products are the same (both a private labeling of 3M 3Bond 4?). Does anyone know if this is correct?

Geo

I'm not familiar with Yamabond, but I am with Permatex Ultra Gray. The Ultra Grey is simply a RTV that is specially formulated for high torque applications. Of course high torque is relative to the other RTVs.

The Nissan SR20DE engine that I'm quite familiar with and have rebuilt uses only one major gasket - the head gasket. Almost all the others are formed using Ultra Gray (there are a few that use black or blue RTV).

I'd be interested to know as well if Yamabond is the same. Is it an RTV?

Matt H

George - it is and RTV that costs about 50 times what a tube of ultra grey costs. Think in the neighborhood of 100 dollars per tube.
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triscadek

Yamabond? I don't think I've ever paid $10 for it.

Beleive me on this one, miserly as I am I'd **** on an electric fence before paying $100 for a tube of anything without an Rx and I'd balk at that.

EDIT: What I used was semi-drying, I'm sure that they have others, Suzuki has a really good sealant too.

Looking at how these are made for air cooled engines that frequently get flogged a lot harder than we would our cars, but their oil psi is a little lower.It's good stuff.

Peckster

Made for air cooled engines? Not many of those around now.

What does RTV stand for?

Matt H

Triscadek - I assumed he was referring to the Porsche bonding agent they use which is similar to the yamabond. My misunderstanding.
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triscadek

I've heard that stuff is pricey.

Just a comment on my miserleyness. I'm not shy about it. No offense meant.

Manning

Peckster

RTV stands for Room Temperature Vulcanization if I remember correctly.

KLR

Permatex Ultra Gray and Yamabond 4 both cost about $6 a tube.

Danno

The Permatex Ultra Gray is not the same as Yamabond-4 which is not the same as Triple-bond. One general rule-of-thumb is to never, ever use ANY silicone type sealant where it may see oil. This takes the Permatex out of the equation. Simple test is to get one of each type. Then apply a thin 0.5mm strip on a piece of metal. Let dry for a couple of days. Then soak the test strip under gasoline, like in a covered tray, for a couple more days. See what the results are. You'll also see why you don't want to use silicone.

There's a new Hondabond variation out now that pretty pricey, not as much as the $100 Porsche stuff that's supposed to be even better than Yamabond-4, but I haven't tried it yet. Figured since Yamabond-4 has worked so well for me anywhere I've tried it, no need for anything more expensive. This included re-using water-pump gaskets, intake-mainfold, rear cam-tower, cam-tower, etc. It even sealed and held a 18-year old USED oil-pan gasket I had lying around after I had to return from Vegas after my oil-pan gasket blew out on the 1st day of the OTC because the engine-builder had used the wrong sealant...

Geo

Sorry Danno, I have to disagree with you on this point. I know my Nissan SR20 engines are spec'd to use RTV for virtually all gaskets except the head gasket. Used properly they don't leak. I think most Japanese engines use RTV grey these days.

I'm not saying it should be used on Porsches, but the above statement is definitely incorrect.

Sam Lin

I agree with Geo, I've used RTV on numerous applications where it's spec'ed in contact with oil and gasoline with no problems.

Sam

Chris_924s

"Beleive me on this one, miserly as I am I'd **** on an electric fence before paying $100 for a tube of anything without an Rx and I'd balk at that."

I think thats the phrase that pays... an instant classic.

inactiveuser92616

hmmm I work at a race car prep shop and we use blue RTV all the time on engine mating surfaces that see oil. We use it for valve covers, transmission mating, all sorts of stuff. works great, the only times we get a leak that I have seen is when we trust the gaskets (O-rings) that come with the parts.

KLR

OK... now a more urgent question on the same topic:

There is a 3-5 day backorder on the paper gasket between the clutch master cylinder and the firewall. I need to replace this sucker within the next two days. Can I use yamabond 4 or permatex ultra grey for this instead of the paper gasket?