3927184 intake

[Tom Stanton (41491)]

Joe
I have recieved the intake I ordered off e-bay. It looks good, and I am going to drill and tap the heat groove as you suggest. My question is the sheet metal pan type arrangement that is rivited to the under neath of the intake. This has a lot of what seems to be carbon build upunderneath it.Should this piece be left on or removed? I have gotten a lot of the carbon out with a screw driver but can't get it all. I had 1 vette shop tell me just take it off you don't need it, but it must have served a purpose of some sort. Please advise any and all help will be appreciated. Thanks in advance.

Tom

[Clem Zahrobsky (45134)]

Re: 3927184 intake

remove the rivets and clean under the shield because there could stuff under there that could come loose and get into your engine. you can drill and tap for machine screws to replace the shield or use the rivets over again with red lock-tite.

[Tom Stanton (41491)]

Re: 3927184 intake

Clem
Thanks for the info, what is that build up? Its not like what I have seen in oil pans or under valve covers, its very hard almost like a putty that has dried.Thanks again for all the help.

Tom

[Mike McCagh (14)]

Re: 3927184 intake

its oil but unlike the debris that builds up in an oil pan that is being bathed in oil continusouly, the oil fumes that make it to the metal shield are exposed to the heat of the engine in a relatively "dry" state, analogous to the modern day creamatorium end product. not sure i got the spelling right. mike

[Joe Lucia (12484)]

Re: 3927184 intake

Tom------

The build-up is carbonized oil. That is, it's oil that's been heated to very high temperature by exposure to the exhaust heat cross-over and "cooked-to-a-crisp". Most of the organic constituents of the oil have been vaporized and what's left behind are inorganic constituents and carbon.

[Clem Zahrobsky (45134)]

PS

if the manifold was bead blasted there are a lot of those little glass beads under there and there have been engines ruined because they were all not removed.

[frank mccracken]

Re: PS

The purpose of the pan is to prevent oil splash on to the underside of the manifold exhaust heated crossover passage.

[John Hinckley (29964)]

Re: PS

The drive rivets are still available (GM#10229247, $5.70 list for a bag of 10); the splined area appears to be just slightly larger than the originals, and there's NO WAY they're going to come out once they're driven in and seated. I've used them on several intakes. Definitely remove the oil shield and clean the coked-up/carbonized oil from it and the bottom surface of the intake thoroughly before re-installing the shield.

[Christopher Ritchie (238)]

Re: 3927184 intake

Yes, you do want to take that off and clean in there. Lots or solid crud in there. Now that you've disturbed it, a piece could come out while the engine is running and plug up some important orifice.

They'll come out relatively easily with a chisel and a hammer. Put the pointed chisel end up against the rivet head as if you're trying to chisel off the head. The head won't chisel off. It'll rise up out of the manifold. My chisel was dull, but this method still worked great.

I wouldn't reuse the old rivets. As John said, they're still available from Chevy. Some people tap the rivet hole and use a cap screw. Probably something around a #10 would work. I'd put Locktite on either the new rivet or cap screw.

Maybe this isn't a critical piece, but I'd put it back on. Chevy felt it was necessary, and they knew more about this than I ever could.

[Tom Stanton (41491)]

Re: 3927184 intake

Thanks for all the response I will take the pan off I have gotten a ton out by just tappiing on it with a rubber hammer then putting a thin screwdriver in and pulling it out but its impossible to get it all that way.I also poured gas down the intake and it washed out a lot of it. It reminds meof the lav rock used in a gas grill. Thanks again for all the input.

Tom