question for motor guys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tmad · 01-03-2005, 08:28 PM

Can someone tell me what the sheet metal piece riveted to the underside of an intake manifold is for????

Tx Firefighter · 01-03-2005, 08:31 PM

To shield the oil from splashing onto the hot exhaust gas passage built into the bottom of the intake.

Oil would quickly build up sludge and carbon if it hit the hot part.

If you remove the cover, you'll find tons of sludge under it that's seeped in over the years. The rivets can be removed by tapping carefully with a sharp little chisel. Be sure to reinstall it after you clean out from under it.

tmad · 01-03-2005, 08:40 PM

Gee that even makes sense!! Thanks for the reply, I always wondeered I just never asked !!!!! Todd

4x4Poet · 01-04-2005, 12:13 AM

If you remove the cover, you might as well hot tank it and the manifold. Best way to get all the sludge/buildup off both. The cover needs to be removed before hot tanking anyway. If you're learing of doing it yourself, most automotive machinists know how from experience. If they say they can save the rivets for reuse, they probably know what they're doing.

incoma · 01-04-2005, 12:31 AM

We always used sheet metal screws to reattach the pan. That way you could unscrew it when you cleaned it out again too. The rivets can will slide back out after re-inserted. Don't want anything bouncing around in your oil gallery!!

67ChevyRedneck · 01-04-2005, 10:06 AM

When my motor was rebuilt I had mine cleaned. NAPA told me it was packed full of carbon. I think I only paid 20 bucks for the cleaning and it was SOOO worth it. It made painting it much easier, cause I didn't have to clean it!!!

JayDubBlazer · 01-04-2005, 10:23 AM

67RedNeck "When my motor was rebuilt I had mine cleaned. NAPA told me it was packed full of carbon. I think I only paid 20 bucks for the cleaning and it was SOOO worth it. It made painting it much easier, cause I didn't have to clean it!!!"

NAPA cleans things? What do they have?

67ChevyRedneck · 01-04-2005, 10:35 AM

I just moved to greenville this summer, but the Napa near Columbia, SC on highway 302 had a machine shop on the side of it... it was part of the store, only one I've ever seen like it. They rebuilt engines and cleaned parts, resurfaced heads...etc. My uncle had his 350 cleaned and bored out there. They used some kind of chemical tank to clean my intake. It had to sit in it for like a day.

jay6891 · 01-04-2005, 11:04 AM

the NAPA store here in Pine Bluff also has a machine shop built into it. One of the better ones around here. We are talking about a cast iron intake aren't we? I always heard you couldn't vat an aluminum part because it would melt.

67ChevyRedneck · 01-04-2005, 11:12 AM

yup, cast iron.

4x4Poet · 01-05-2005, 04:20 AM

Hot tank. Many machine shops now have a second "hot tank" setup with chemicals that won't harm aluminum or galvanized metal.

01-03-2005, 08:28 PM	#1
tmad Registered User Join Date: Nov 2001 Location: youngsville pa Posts: 166	question for motor guys Can someone tell me what the sheet metal piece riveted to the underside of an intake manifold is for????

01-03-2005, 08:31 PM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	To shield the oil from splashing onto the hot exhaust gas passage built into the bottom of the intake. Oil would quickly build up sludge and carbon if it hit the hot part. If you remove the cover, you'll find tons of sludge under it that's seeped in over the years. The rivets can be removed by tapping carefully with a sharp little chisel. Be sure to reinstall it after you clean out from under it. __________________ I'm on the Instagram- @Gearhead_Kevin

01-04-2005, 12:13 AM	#4
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	If you remove the cover, you might as well hot tank it and the manifold. Best way to get all the sludge/buildup off both. The cover needs to be removed before hot tanking anyway. If you're learing of doing it yourself, most automotive machinists know how from experience. If they say they can save the rivets for reuse, they probably know what they're doing. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

01-04-2005, 10:06 AM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	When my motor was rebuilt I had mine cleaned. NAPA told me it was packed full of carbon. I think I only paid 20 bucks for the cleaning and it was SOOO worth it. It made painting it much easier, cause I didn't have to clean it!!! __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-04-2005, 10:23 AM	#7
JayDubBlazer go cyclones Join Date: Jun 2003 Location: Ames, IA Posts: 1,885	67RedNeck "When my motor was rebuilt I had mine cleaned. NAPA told me it was packed full of carbon. I think I only paid 20 bucks for the cleaning and it was SOOO worth it. It made painting it much easier, cause I didn't have to clean it!!!" NAPA cleans things? What do they have? __________________ Wes PROJECT OLE GREEN 1972 Blazer 4X4 350/700R4 2017 Silverado LT

01-03-2005, 08:40 PM	#3
tmad Registered User Join Date: Nov 2001 Location: youngsville pa Posts: 166	Gee that even makes sense!! Thanks for the reply, I always wondeered I just never asked !!!!! Todd

01-04-2005, 12:31 AM	#5
incoma Registered User Join Date: Mar 2004 Location: Lexington, KY Posts: 865	We always used sheet metal screws to reattach the pan. That way you could unscrew it when you cleaned it out again too. The rivets can will slide back out after re-inserted. Don't want anything bouncing around in your oil gallery!!

01-04-2005, 10:35 AM	#8
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	I just moved to greenville this summer, but the Napa near Columbia, SC on highway 302 had a machine shop on the side of it... it was part of the store, only one I've ever seen like it. They rebuilt engines and cleaned parts, resurfaced heads...etc. My uncle had his 350 cleaned and bored out there. They used some kind of chemical tank to clean my intake. It had to sit in it for like a day. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-04-2005, 11:04 AM	#9
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	the NAPA store here in Pine Bluff also has a machine shop built into it. One of the better ones around here. We are talking about a cast iron intake aren't we? I always heard you couldn't vat an aluminum part because it would melt. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

01-04-2005, 11:12 AM	#10
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	yup, cast iron. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-05-2005, 04:20 AM	#11
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Hot tank. Many machine shops now have a second "hot tank" setup with chemicals that won't harm aluminum or galvanized metal. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

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