How much blow by is normal? - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 10 (permalink) Old 04-04-2018, 09:07 PM Thread Starter
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How much blow by is normal?

I’ve got a 2000 F250 with 216k I’ve had the truck for about a year and lately I’ve been noticing a decent amount of vapor. There’s no rough idle or anything and I’ve done the oil cap float test and it doesn’t have much pressure. I guess what I’m asking is, is this something I should be concerned about?
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post #2 of 10 (permalink) Old 04-04-2018, 09:16 PM
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Where are you seeing vapor? Just when the oil cap is off? If it doesn’t blow the cap off, don’t worry about it.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #3 of 10 (permalink) Old 04-04-2018, 09:57 PM Thread Starter
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I’ve got a 3/4 or7/8” hose coming from the ccv down under the drivers side door. I’m not sure if it comes stock like that? But it’s been that way since I’ve had it. Anyhow that’s where it’s coming from mostly but also a little from the dipstick tube and the oil cap.
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post #4 of 10 (permalink) Old 04-04-2018, 10:26 PM
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That’s not how it comes. You’re dumping raw fumes into the atmosphere. Hasn’t been legal since the early 60s. The engine crankcase fumes should go into the intake tube where they are burned. Someone did the ill conceived CCV mod on the truck. Please undo it.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #5 of 10 (permalink) Old 04-10-2018, 05:42 PM
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I also have the "ill conceived" CCV mod.
I fabricated a catch can and mounted it up high. Line in at the bottom and out at the top.
Residual oil drains back to the crankcase. The hose runs along the frame rail to the end of the gas tank.
I did the mod after blowing off an intercooler coupler a while back and found the inside of the tubing coated with an oily film.

That reminds me...
...I should probably take out the intercooler and wash it out with degreaser.

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Early 99 7.3, 11/98 build, 6spd, X-cab XLT DRW 2WD, 145k and counting
Full Force 180/0 single shot injectors, TS 6 position chip
Riff Raff FRX, Riff Raff Banjos, Strictly Diesel HPX
4" DP and straight pipe exhaust, 6637 air filter
Hutch mod, CCV mod, coolant filter
South Bend 1944-60K-HD clutch
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post #6 of 10 (permalink) Old 04-10-2018, 08:42 PM
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So now that oily vapor is pumped into the atmosphere. They make oil resistant boots if the seepage was troubling, but the oily residue isn’t what caused the boot to blow off.


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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM, Full Force Stage 1 injectors

IF MY BODY IS EVER FOUND ON A JOGGING TRAIL JUST KNOW THAT I WAS MURDERED SOMEWHERE ELSE AND DUMPED THERE
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post #7 of 10 (permalink) Old 04-11-2018, 09:49 AM Thread Starter
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What kind of a catch can did you use?
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post #8 of 10 (permalink) Old 04-11-2018, 11:36 AM
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I know the vapor is going to atmosphere and I'm not saying that it caused the coupler to blow off.
I just found the inside of the tubing coated with an oily film.
This was the tube going to intercooler inlet.
I sprayed/cleaned it with degreaser and solvent before putting it back.
My thinking is that if the tubing is coated with oil then so is the inside of the intercooler.

When I pulled the tubing off to change my injectors, the tubing had no oil film.

"Slow White"
Early 99 7.3, 11/98 build, 6spd, X-cab XLT DRW 2WD, 145k and counting
Full Force 180/0 single shot injectors, TS 6 position chip
Riff Raff FRX, Riff Raff Banjos, Strictly Diesel HPX
4" DP and straight pipe exhaust, 6637 air filter
Hutch mod, CCV mod, coolant filter
South Bend 1944-60K-HD clutch
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post #9 of 10 (permalink) Old 04-11-2018, 11:40 AM
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Quote:
Originally Posted by SamB21 View Post
What kind of a catch can did you use?
I made the catch can from a piece of 3" aluminum tubing about 4" long, (.060" wall).
Welded caps on each end and mounted horizontally behind the clutch reservoir.
the hose from breather connects low and hose out connects on top.
I'll try to get a pic later

"Slow White"
Early 99 7.3, 11/98 build, 6spd, X-cab XLT DRW 2WD, 145k and counting
Full Force 180/0 single shot injectors, TS 6 position chip
Riff Raff FRX, Riff Raff Banjos, Strictly Diesel HPX
4" DP and straight pipe exhaust, 6637 air filter
Hutch mod, CCV mod, coolant filter
South Bend 1944-60K-HD clutch
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post #10 of 10 (permalink) Old 04-11-2018, 07:27 PM
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I blow by people all the time in my 7.3, so I would say that a certain amount of "blow by" is normal.
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2002 F-350 7.3 4x4 Crew • DRW to SRW Conversion • Full Force 160cc Single Shot Injectors • DP-Tuner • FRX • HPX • AIS w/ Fender Sleeve • BTM • Hutch • Harpoon • High Output Alt • 4.10 Gears • 285/75/16 Tires • Hauling 2000 Lb. Cabover Camper

Previous: 2006 E-350 6.0 • Quigley 4x4 • Extended Body Sportsmobile Conversion • Innovative Diesel Tunes • Aluminess Bumpers • Warn Winch • 285/75/16s

Last edited by dieseldweller; 04-11-2018 at 07:36 PM.
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