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#1
10-13-2017, 07:41 AM
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Using compressed air to blow out carbon from glow plug holes
The FSM procedure for replacing the CDI glow plugs specifies using a pair of cylindrical brushes, 6mm and 10mm. So I got a set of brushes. What about also using compressed air to dislodge the carbon? Any downside to that?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
10-13-2017, 08:47 AM
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Why would you want to blow dislodged bits of carbon deeper into your engine?
Use a shop vac to remove the bits instead.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#3
10-13-2017, 10:10 AM
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Quote:
Won't dislodged carbon fall into the engine when using the brushes? Why would that matter...won't it just get blown out the exhaust?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
10-13-2017, 10:25 AM
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You can use compressed air to pull a vacuum, just blow air through a tee with both ends open. The tee side will pull a vacuum:
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment
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#5
10-13-2017, 10:44 AM
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Bucket Head 5 gal. 1.75-Peak HP Wet Dry Vac-BH0100 - The Home Depot
For $20 plus tax, you can't go wrong.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#6
10-13-2017, 10:51 AM
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Thanks for the tips/recommendations. But as to the fate of carbon that drops down into engine....it just gets blown out the exhaust, right?
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#7
10-13-2017, 11:05 AM
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AFTER it gets dragged up and down the cylinder walls. Usually causes no problem when it's loose but using compressed air can force it into any gaps of the rings, valve seats, etc.
Your car, your money.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#8
10-13-2017, 11:08 AM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#9
10-13-2017, 11:09 AM
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Put this on your Xmas/wish list.
https://www.shopvac.com/product/shop-vac-5-gallon-4-0-peak-hp-hardware-wet-dry-wall-mount-vac-catnum:3942300 Handy to have and it's one of those things you wonder how you did without. Keep an eye out for specials. I picked mine up for $39.95 at Ace Hardware during one of their spring special savings deals.
__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#10
10-13-2017, 12:02 PM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#11
10-13-2017, 12:10 PM
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__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.” ― Brian P. Cleary, You Oughta Know By Now
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#12
10-13-2017, 12:14 PM
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Excellent....thanks, Mike!
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#13
10-13-2017, 12:18 PM
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That Amazon kit may not be small enough to get in the hole. I use a hose or tubing small enough in diameter and duct tape it to the large vacuum hose. Works every time.
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85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#15
10-16-2017, 06:04 PM
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Quote:
I never blow anything into a cylinder on purpose. I use heavy grease on the reamer when I do glowplugs. Most of the carbon comes out then. Turning the engine over after reaming glow plug hole blows most of what the greasy reamer misses.
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84 300SD 85 380SE 83 528e 95 318ic
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