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Dirty intake manifold - How to clean? Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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FireFox31
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Dirty intake manifold - How to clean?

Post by FireFox31 »

While doing the PCV cleaning on my 2000 V70 NA, I found the intake manifold caked with black deposits. I plan to spray each port with carb cleaner and brush them out with a wide pipe cleaner. Is there any problem with that or better method I could use?

Here's a good explanation of manifold buildup. One user took his intake for professional cleaning, but I can't drive with the car apart.

Also, does a 2000 have an EGR? This EGR clean DIY by MadeInJapan makes me think I should clean this while my PCV is apart. Is this where the corrugated metal pipe connects the intake manifold and... where else?
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volvolugnut
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Post by volvolugnut »

Carb cleaner will cut these deposits. A stiff brush (brass or nylon) will work better than a pipe cleaner. You will have to do some scrubbing. You can also clean the outside for improved appearance with alcohol and tooth paste (yes really). The tooth paste acts as a polishing compound to shine up the aluminum.
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Post by RickHaleParker »

Go to the Dollar Tree and get some cans of Oven Cleaner. Use it like you would on a filthy oven. Oven Cleaner will even cut the baked on deposits.
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Post by abscate »

Safety classes for oven cleaner and rinse spray, very nasty on eyes and skin.
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Post by volvolugnut »

abscate wrote: 21 Aug 2021, 06:20 Safety classes for oven cleaner and rinse spray, very nasty on eyes and skin.
Safety classes and glasses.

volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.

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FireFox31
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Post by FireFox31 »

Awesome tips, thanks! Alcohol and toothpaste? Any specific ratio? I might just try it...
FireFox31
Blue 2000 V70 NA manual, "the V70" - died, reborn, totaled, donated, stripped
Green 2000 V70 NA automatic, "the G70" - awaiting 2nd rehab
Black 2000 V70 NA automatic, "Geronimo" - rescued, rehabilitating
Blue 1998 V70 T5 manual, "the T5M" - awaiting rehab

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Post by volvolugnut »

FireFox31 wrote: 21 Aug 2021, 08:23 Awesome tips, thanks! Alcohol and toothpaste? Any specific ratio? I might just try it...
Alcohol for general cleaning and removing the factory coating on the aluminum. At least I think that was a factory coating on my manifold that had turned yellow and was mostly pealed off.
The tooth paste is used separately for polishing after the surface is cleaned. The tooth paste will also do some cleaning. Brush it on with a tooth brush and scrub until it looks better then rinse with clear water. It really makes the manifold look better without great effort.
volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.

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Post by foggydogg »

Glove up too, but we know you are already doing that.
Modern oven cleaners are not pure lye anymore, but still pretty user-unfriendly. I would say keep it off the outside, it could get splotchy.
"Barkeepers Friend" is made for stainless, so it's pretty agressive, but cleans up aluminum too.
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Post by FireFox31 »

volvolugnut wrote: 21 Aug 2021, 08:32 Alcohol for general cleaning and removing the factory coating on the aluminum. At least I think that was a factory coating on my manifold that had turned yellow and was mostly pealed off.
Thanks. My entire engine block is covered in slight white scale. No yellow. I'll try some rubbing alcohol on it first, then some toothpaste. First, I'll clean out the inside.

Yes, I've got some good long cleaning gloves and eye protection. The annoying part is trying to catch all the liquid run off for proper disposal. The liquid will be a mix of so many cleaners, I can't imagine how the hazardous waste collection company will properly deal with it.
FireFox31
Blue 2000 V70 NA manual, "the V70" - died, reborn, totaled, donated, stripped
Green 2000 V70 NA automatic, "the G70" - awaiting 2nd rehab
Black 2000 V70 NA automatic, "Geronimo" - rescued, rehabilitating
Blue 1998 V70 T5 manual, "the T5M" - awaiting rehab

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Post by RickHaleParker »

foggydogg wrote: 21 Aug 2021, 09:17 "Barkeepers Friend" is made for stainless, so it's pretty agressive, but cleans up aluminum too.
Barkeepers Friend is good stuff, I use it. But you can fill the manifold with the Oven cleaner foam and get the manifold clean inside and out.

You guys got the safety glasses and protective clothing parts but you forgot well-ventilated.

If One does not want to mess with any chemicals, One could take it to a Machine shop or a Garage and have them run it through their solvent tank.
Last edited by RickHaleParker on 21 Aug 2021, 14:43, edited 1 time in total.
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1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

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