hello-

recently I used some of this for RTV on the oil pump, and rear main surfaces



I purchased it on McMaster's site and they advertise it is for use on temperatures up to 350 F. Is this safe to use on my motor?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by McMaster.com &raquo;</TD></TR><TR><TD CLASS="quote">For sealing, bonding, and gasketing metal, glass, wood, silicone resin, vulcanized silicone rubber, ceramics, natural and synthetic fiber, and plastics. Won't run on overhead and vertical surfaces. Begins to harden in 20 minutes. Temp. range is -76° to +350° F for aluminum, clear, and white; -76° to +400° F for black. Meet MIL-A-46106B. FDA and USDA compliant. NSF-51 and NSF-61 certified for use with food equipment materials and drinking water systems. UL recognized.

</TD></TR></TABLE>

 

That's a relatively low maximum operating temperature, and I'm not sure I'd be comfortable using it on my motor. I would suggest something like Permatex Ultra Copper or Ultra Grey, which both have maximum temperature ranges exceeding 600 degrees.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Padawan &raquo;</TD></TR><TR><TD CLASS="quote">That's a relatively low maximum operating temperature, and I'm not sure I'd be comfortable using it on my motor. I would suggest something like Permatex Ultra Copper or Ultra Grey, which both have maximum temperature ranges exceeding 600 degrees. </TD></TR></TABLE>
Hondabond HT is good to 600 also.

 

crapp I didnt wanna hear that.

Well, I dont mind rediong the rear seal cause its easy but i SUCK at timing eblts and it just so happens to be on there perfectly?

I know this isnt ideal, but I can check to see if any dried inside the block? dammit!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18EG6 &raquo;</TD></TR><TR><TD CLASS="quote">
I purchased it on McMaster's site and they advertise it is for use on temperatures up to 350 F. Is this safe to use on my motor?</TD></TR></TABLE>
Is it oil resistant? That looks like the stuf I used to repair a fishtank a while back.

 

good question I will find out if it isnt given on the site. I was also worried about it breaking down at high temperatures and ending up somewhere bad to re-dry.

My reasoning stemmed from the oil temp gauge I had ending around 300 F


edit - emailed mcmaster, will find out monday. I asked about its resistivity to oil and also characteristics around it's 350 F operating range


Modified by B18EG6 at 12:13 AM 1/22/2006

 

dude, you're fine. don't let these guys get you all paranoid. dow corning makes some of the best greases and sealants out there.
look at any number of honda service bulletins. even honda reccomends you use dow corning 111 or dow corning 160 in certain applications.

you're fine. don't worry about it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike K &raquo;</TD></TR><TR><TD CLASS="quote">dude, you're fine. don't let these guys get you all paranoid. dow corning makes some of the best greases and sealants out there. </TD></TR></TABLE>

No one is disputing the quality of Dow Corning products, Mike. However, even the best products still need to be properly matched to their intended applications, and I think that's the issue here.

As a rather rough analogy, look at the ITR's stock Potenza RE-010's. Bridgestone makes excellent tires, and the RE-010's are no exception. However, they were designed as a summer / high performance tire, and the results obtained from using them in snowy and icy conditions are poor. This is not a fault of the tires themselves, but simply a consequence of trying to use them in an application that they were not created for.

I'm certainly not trying to spur an argument, rather just attempting to explain the rationale that I and others have used in recommending a product that was specifically designed for the original poster's application.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mike K &raquo;</TD></TR><TR><TD CLASS="quote"> even honda reccomends you use dow corning 111 or dow corning 160 in certain applications.

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What applications would those be? What about this guys application? Doesn't the factory service manual recommend hondabond?

 

Thanks for all the replies. I did a *quick* mcmaster search on dow corning 111 and it has applications ranging to 400 F. so in that sense, my pictures RTV is already 50 F short of honda's reccommendation to Dow.

Also, I do agree that Dow makes some of the best sealants, but yes I was checking to make sure the 732 will work

Tomorrow I hear back from McMaster; they have always provided me with very concise information. I will post their reply here first thing to get a more accurate answer!

Thanks!!!

 

dow 111 is mainly used on seat rails and certain recalls. it's not a room temp vulcanizing sealant. it's a silicone grease.

but even so, that 732 is rated to 350 degrees. your motor doesnt see that temperature.. even in the middle of summer @ the race track.

i seriously think he's fine.

hey dude, if you spring a leak BECAUSE of the dow corning 732, gimme your address and i'll send you a tube of hondabond.

 

Haha okay deal. I was also worried about any RTV inside the block getting heated to 350 and recooling somewhere bad.

Mcmaster has yet to reply to my email, I am hoping I didnt f$@# up on the address I supplied them.