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Username Post: Applying intake gasket RTV        (Topic#347115)
BigBoreFun 
Forum Newbie
Posts: 5
BigBoreFun
Reg: 09-11-17
09-12-17 08:58 PM - Post#2707533    

A 1/4 inch bead, or so, should be used to mate the front and rear of the block to the intake. Are there concerns about the RTV breaking off inside the engine?

'62 Impala
'65 C-10
'69 Chevelle


 
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64ausbelair 
Silver Supporting Member
Posts: 218
64ausbelair
Age: 44
Loc: Australia (QLD)
Reg: 10-26-06
09-12-17 10:06 PM - Post#2707535    
    In response to BigBoreFun

I suppose the worst that could happen would be it makes its way down into the sump, then what. Maybe get sucked into the oil pump if its small enough and gets through the screen. The pump would make short work of a piece of silicon. Then it would end up in the filter.
If you do a nice even bead on your intake you really shouldn't get any in the engine I guess. I wouldn't be overly concerned myself if I knew a bit went in. I'd keep an eye out for it in oil and filter changes.



 
DonSSDD 
Silver Supporting Member
Posts: 6614
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
09-13-17 01:24 AM - Post#2707540    
    In response to 64ausbelair

RTV is what should be used and is used on thousands if not millions of our small blocks etc., without the rubber end pieces that come with the intake gaskets by the way.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
DZAUTO 
Senior Member
Posts: 8378

Loc: Mustang, OK, USA
Reg: 12-25-99
09-13-17 09:48 AM - Post#2707563    
    In response to DonSSDD

I cannot even begin to count the engines I've put together using RTV on the front/back of the intake/block mating surfaces. I stopped using the rubber seals which come in intake gaskets sets over 30yrs ago, and glad I did. After pulling some of them apart, I have NEVER observed any RTV broken loose on the inside.



 
BigBoreFun 
Forum Newbie
Posts: 5
BigBoreFun
Reg: 09-11-17
09-13-17 11:53 PM - Post#2707623    
    In response to DZAUTO

I watched a video on someone using rtv to coat a timing gasket and the reason he had it apart was because the oil screen was plugged with loose silicon and the engine spun a bearing. Got me thinking. Thanks for the feedback gents!

'62 Impala
'65 C-10
'69 Chevelle


 
models916 
Valued Contributor
Posts: 4653

Age: 66
Loc: Addison, IL
Reg: 05-28-10
09-14-17 03:28 AM - Post#2707625    
    In response to BigBoreFun

If a little is good, a lot must be better.



 
Petrol 
Contributor
Posts: 392

Reg: 08-09-15
09-15-17 04:16 AM - Post#2707712    
    In response to models916

The old style rubber gaskets for the ends of the intake were a PITA. A bead of RTV was much more reliable. If the metal surface is clean and free from oil, the RTV will adhere nicely and there's little chance of it failing.

Now, the newer style rubber end gaskets stay in place a bit better than the old ones. Even with those I would place a small dab of RTV at the ends.

RTV works fine but if you use the rubber gaskets the best solution is to use some 3M weather strip adhesive (the super sticky yellow stuff) to glue the rubber gasket to the block a few hours before you put the intake back on. If you don't have the time I suggest using RTV without the rubber gaskets.



 
popper 
Gold Supporting Member
Posts: 20
popper
Loc: Midwest
Reg: 01-08-08
09-15-17 05:37 AM - Post#2707720    
    In response to Petrol

I have always used RTV for intakes. I always try to apply it across the block in one continuous strip. Remember there is a gap and the gasket that is normally there is approx 1/8" thick so it won't have the tendency to push it all out when torqued down. Where people get into trouble is using too much where you pull the sealed surface down with very little clearance, such as timing chain covers, around intake ports and water pumps. The RTV will push out and then has the ability to clog things up. Just use your best judgement about how it is being used and that you don't always need to just goop it on.

popper
John Lynch








"LIFE IS HARD, IT'S HARDER WHEN YOUR STUPID" John Wayne


 
dgstarr 
Silver Supporting Member
Posts: 20
dgstarr
Loc: Portland, OR
Reg: 04-16-13
09-17-17 05:28 PM - Post#2707954    
    In response to popper





 
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