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GDI Intake Valve Cleaning (walnut shells)

GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 12:55am

Thought I'd carry this info over from the other thread in the standard Vortec 5.3 area I posted in, to avoid confusion. Oooops, my bad.. <thumbs-up>

Intake valve cleaning


(MOD NOTE)***Merged this thread with your old thread... all in one location in the Ecotec section.***
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truckdad15
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 1:33am

I'm having to clean the valves on my 2015 truck AGAIN after 86k miles, so I thought this info may be useful here.

I did a chemical cleaning the first time around w/ intake removal and BG cleaners - having decent success I guess, but I never felt that they got as clean as they could have been. Soooo, this time around, I'm doing the walnut shell blasting gig to see if I can get the ports and valves bare-metal clean.

1. I just bought a port adapter like this from Ebay - $27
https://www.ebay.com/itm/GMC-Chevy-Inta ... Sw~RldO3EY

2. A small 40lb. blaster kit like this from Harbor Freight; $120
https://www.harborfreight.com/40-lb-pre ... 68992.html

3. Walnut shells; $25/ea. x2 (50 lbs. total)
https://www.harborfreight.com/25-lbs-co ... 92150.html

4. 3/8" steel fuel line kit; $15
https://www.napaonline.com/en/p/NDP7304 ... t=730+4931

I've got about $212 bux in everything before taxes, so we'll see how this goes and I'll post back the results.
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truckdad15
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 1:37am

My valve cleaning stuff arrived Friday afternoon, so we'll see how it goes today. Let the fun begin... ;)
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truckdad15
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 1:39am

Okay...here goes and I'll outline my steps to do this and my observations of how everything worked, in case someone else wants to do this to their truck(s). I can say this...it's not that difficult and can probably be done at home in a short weekend if you have a decent air compressor to feed the blaster. Just be patient, don't cut corners and take your time. :)

VEHICLE PREP:
1. Remove battery cables and set yourself up plenty of light in the engine bay....you're going to need it!

2. I like to use heavy wool blankets on the front grill and fenders to protect either of them from scratches on the paint and chrome.

3. Obviously, remove what-ever air intake system you have and the intake manifold.

4. Vacuum up a loose dirt, leaves or what-not from the engine bay and around the heads so nothing falls into the open intake ports while the intake is off.

5. Tape-off the open intake ports and anything else that's open in the engine bay like the MAF tube, crankcase vent port, valve cover vent ports, etc.

6. Pull the spark plugs to make the engine easier to roll-over when you must close each intake valve before the work in done in that hole.

7. Remove the tape from that port for which you'll be working on first.

8. Roll the engine over by hand clock-wise using a ratchet/socket on the crank bolt until the intake valve is fully (and tightly) on it's seat.

Wooot Wooot! You're now good to go w/ vehicle set-up, so now onto the equipment set-up before you get started... :)
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truckdad15
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Re: Intake valve cleaning

Postby B52Bombardier1 » Feb 23 2020, 1:46am

I stand corrected and learned something. Thank you.

Rick

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1970 Chevy El Camino 5.3 liter LM7 Engine and 4L60E Transmission
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 2:04am

The equipment to do this job isn't all the technical or even expensive, so I think it's definitely a do-able gig for the DIY'er if you pay attention to details. Everything assembled together pretty easy and was straight-forward, but I did have to make one modification to the blaster nozzle to create a wand that extended into the intake port. The details - so here goes! ;)

EQUIPMENT SET-UP:
1. Grab yourself a shop vac of some kind, as that is used to vacuum the heavy dust and carbon debris as the port is blasted clean. The orange adapter kit you see above uses a 2" neck, so any vacuum hose that inserts over or in the adapter neck snugly should suffice.

2. Be sure you have a decent sized garage or shop air compressor that can easily supply 90-115 psi at least 7 CFM or better. The more capacity for both, the better - as the gun won't get clogged as much during operation.

3. Assemble the blaster kit per the instructions and add a quick connect air fitting that matches whatever size your air source hose is.

4. My blaster holds 40 lbs. of crushed walnut material, but I only added about 20 lbs. or so to begin with until I got used to working w/ this thing.
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 2:17am

After assembling the blaster kit, you'll need to fabricate a wand for it that replaces the ceramic injector nozzle that comes stock in the kit. You'll use this wand to extend down into the intake port to get the valve face and intake port walls clean.

1. Locate the stock blaster ceramic injector nozzle and remove it from the tip.

2. Using the 3/8" steel fuel line kit you purchased from NAPA, modify both ends of that fuel line as shown, by cutting the tips off with a tubing cutter.

3. You'll cut one end of the barb completely off and the other end you'll will leave just a short shoulder remaining. This shoulder seats onto the ball valve to seal it and the rib will be captured by the retaining nut to keep the wand attached onto the ball valve.
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truckdad15
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 2:26am

4. Locate the tube nut and assemble it onto the tube as shown.

5. Attach the ribbed-end of the tube onto the ball valve and tighten the tube nut snugly until the tube seats itself and is secure onto the ball valve assembly.

6. You now should have a newly modified walnut shell blaster wand ready for service.

7. *As an option, you can put a slight bend on the wand tip if you wish to help get into some of the tight nooks and crannies inside the intake port, but it's not entirely required. ;)
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truckdad15
Firing on 7 cylinders [L1]
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Re: Intake valve cleaning

Postby truckdad15 » Feb 23 2020, 2:29am

B52Bombardier1 wrote:I stand corrected and learned something. Thank you.

Rick

Sent from my SM-G965U using Tapatalk


You're all good! I should have posted all this info in the Ecotec 5.3 section instead of the Vortec 5.3 section... Oooops! :lol:
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truckdad15
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Re: GDI Intake Valve Cleaning (walnut shells)

Postby truckdad15 » Feb 23 2020, 2:50am

Once you have the vehicle prepped as described above and your equipment is ready for service, you can get to work!

PORT CLEANING:
8. Be sure the filler cap on the blaster is tightened down, turn on the air supply and media supply valves to feed the discharge hose.

9. Attach the vacuum hose to the intake port adapter neck and turn on the vacuum.

10. While holding the intake port adapter into the port entrance, insert the injector wand into the feed hole of the adapter.

11. Slowly open the ball valve until you hear the air and media rushing into the intake port. Move the wand all-around to get at everything around the valve and on the intake port walls.

*I will say this....this blasting is VIOLENT, LOUD and MESSY - even with the vacuum singing at full song, as a few beads of crushed shells will still sneak their way around the intake port adapter! Jeeez!! :shock:

**Make sure you wear safety glasses and be prepared to clean a few "puddles" of spent walnut shells up from around the engine bay when you're done. An air hose to blow everything off and a vacuum to finish the clean-up goes a LONG way here!
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