How much Blowby?

future_cummer · 09-25-2006, 01:59 PM

Hello all about a week ago I picked up a 98 1/2 12 Valve 5 speed truck with 260,000 miles on it. I'm wondering about blowby. When the truck is just sitting there idling you can't see nothing, but when you drive it at freeway speeds for a while come home and park it there is oil on the front driveline and all over the undercarriage. I've drove the truck a total of 500 +/- miles and had to add 2 quarts of oil can anyone tell me what is going on with this? The draft tube comes out of the motor and just hangs straight down. I don't think the oil is coming from anywhere else? Any input or advice would be greatly appreciated.
I will change my user name and update my sig in the next day or two!!
Thanks,
Justin

__________________
2000 Ford F-350 CC LWB ZF-6 250,000 + miles, 4" ATS exhaust, Homeade Tymar intake, Wanting more mods.

illflem · 09-30-2006, 12:49 PM

You need a blowby tool.
The Cummins blowby orifice tool is simply a tee with one .221" (15/64-in) outlet. Connect one end of the tee to the end of the blowby tube. Put a manometer on the last tee outlet. That is your blowby tool. They sell them at Cummins, but I have made my own plenty of times, less than $10. A simple manometer can be made by looping into a 'U' 6 feet of clear tubing, fill it with water in it half way. Measure how high the water level rises with a tape measure, multiply it by 2, convert it to LPMs.

Rough conversion is 1"= 27 lpm, add 3 lpm for each one inch (1/2'' of rise in the tube) of water

The reason for multiplying by 2 is that inches of water equals the water rise in the open end of the tube plus the inches the water is pushed down on the engine side of the water tube. For simplicity my numbers below are the measurement of rise only.

Cummins new 5.9 engine numbers are:
63 liters per minute(2.5" water rise) @ 2200rpm,
76 L/Min (3.5" rise) @ 2500rpm
85 L/Min (4.5" rise) @ 2800rpm.

Worn engine that needs rebuilding are roughly double i.e.
126 L/Min(10.5"rise) @ 2200rpm
152 L/Min(14.5"rise) @ 2500rpm
170 L/Min(17"rise) @ 2800 rpm

Beside indicating a compression problem the valves could also be out of adjustment.

Another way (mine), same idea, is to block the blowby tube with a 1/2'' pipe nipple with a cap that has a 15/64 hole drilled in it. Use 3/8'' id looped clear tubing with water in it slipped over the oil dipstick tube. Other tubing end remains open. Use a sharp tipped felt marker to mark the water level with the engine off, have a helper start an already warmed up engine and run the rpms up to 2.2, 2.5 & 2.8k rpms. Mark each water level with the pen, measure the distance from engine off mark then multiply each by 2.

This is all very simple to do, just hard to explain with words.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

Sea01Cummer · 10-01-2006, 11:54 PM

Nice instructions, that will help lot's of people.

Steve

__________________

2001.5 Dodge 2500 CTD, 6 Speed, Leather,Headache Rack, Edge HOT Juice with Attitude,BD 130 HP Pulse Injectors, 4 inch Exhaust, FE Clutch,Vulcan Big Line Kit, IIS Super Phat Shaft 62/14, Swanker Intake Manifold,ATS Exhaust Manifold,ARP 12 MM Head Studs, HB High Idle Kit, 12v Marine .020 Headgasket. .

PICTURES

www.industrialinjection.com

Dynoed 505/1085 on 8/26/06 :woot2 with water-meth

Guns don't kill people.... Husbands that come home early kill people....

Don't Forget To Vote For ROTM

9812VCTD · 10-02-2006, 01:45 AM

WOW thanks for that great write-up I don't know what is going on, I went and washed my whole under carriage off and changed my oil and filter. Put in Delo 400 and a Fleetguard Stratapore filter and drove it an hour to a sledpull, around town and back home and was nervous but checked under the truck and there was not a drop of oil anywhere??

I have looked under the truck numerous times and never seen any blowby and the motor runs strong. I was really glad to see no oil.
P.S. the oil I drained out of it looked like it had quite a few miles on it, not good. :fist:
Thanks,
Justin

__________________
1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

Extreme1 · 10-08-2006, 04:45 PM

Was it overfilled?

__________________
Wanted: Blue 95-97 extended cab interior. PM or email me condition and location.

'94 3500 4x4, 299,000 miles

9812VCTD · 10-09-2006, 01:52 PM

It may of been a little overfilled but not much, I'm thinking of making a CCV system of some kind or maybe get my valves checked they don't sound bad but worth a try?
Justin

__________________
1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

***Mopar1973Man*** · 10-26-2006, 10:23 AM

Well if you want to create a CCV system a simple idea to look at and modify...
http://www.frontiernet.net/~mopar197...kcase_vent.htm

Yes I know its a 24V engine setup! But the idea is to get the pipe to run up hill first then back down hill... That will help with the oil blowing up a bit...

__________________

Michael Nelson - 2002 Dodge Cummins

For Technical Assistance With Your 24V 2nd Generation Cummins - Click Here! Or Search CF.Com for an Answer

Remember to smack the THANKS! button for those that helped you or you think that post is helpful to others!

inline6359 · 10-26-2006, 10:59 PM

check your valve covers, mess ed with mine and now my back gasket is leaking. It leaks over the back of the motor and runs down the bell housing and drips on the ground. Just an idea.

9812VCTD · 11-02-2006, 08:42 AM

Thanks for the replies appreciate it, I like your ideas on the CCV vent mod I am going to check into doing this, Thanks!:thumbsup
Justin

__________________
1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

nate379 · 10-04-2008, 01:18 PM

Hello,

I know this is an old thread. I found it through Google and I built a manometer like described.

I have a few questions.

The NEW engine specs, is that an engine that hasn't been broken in?

My truck has 182,000 miles and these are the #s I got:

Idle - 1" rise
2200rpm - 2" rise
2500 rpm - 2 5/8" rise
2800 rpm - 3 7/8" rise

These are all quite a bit lower than the new engine #s.

The other question I had is how is inches of water column converted to liters per minute?

Your formula 1" = 27L/Min and then add 3 for every inch doesn't work out the way I'm figuring it out.

Old Engine spec 170 L/Min (17") rise.

17" rise equals 34" water column.
34*27=918
27*3=81

918+81 = 999 L/Min

Quote:

Originally Posted by illflem

You need a blowby tool.
The Cummins blowby orifice tool is simply a tee with one .221" (15/64-in) outlet. Connect one end of the tee to the end of the blowby tube. Put a manometer on the last tee outlet. That is your blowby tool. They sell them at Cummins, but I have made my own plenty of times, less than $10. A simple manometer can be made by looping into a 'U' 6 feet of clear tubing, fill it with water in it half way. Measure how high the water level rises with a tape measure, multiply it by 2, convert it to LPMs.

Rough conversion is 1"= 27 lpm, add 3 lpm for each one inch (1/2'' of rise in the tube) of water

The reason for multiplying by 2 is that inches of water equals the water rise in the open end of the tube plus the inches the water is pushed down on the engine side of the water tube. For simplicity my numbers below are the measurement of rise only.

Cummins new 5.9 engine numbers are:
63 liters per minute(2.5" water rise) @ 2200rpm,
76 L/Min (3.5" rise) @ 2500rpm
85 L/Min (4.5" rise) @ 2800rpm.

Worn engine that needs rebuilding are roughly double i.e.
126 L/Min(10.5"rise) @ 2200rpm
152 L/Min(14.5"rise) @ 2500rpm
170 L/Min(17"rise) @ 2800 rpm

Beside indicating a compression problem the valves could also be out of adjustment.

Another way (mine), same idea, is to block the blowby tube with a 1/2'' pipe nipple with a cap that has a 15/64 hole drilled in it. Use 3/8'' id looped clear tubing with water in it slipped over the oil dipstick tube. Other tubing end remains open. Use a sharp tipped felt marker to mark the water level with the engine off, have a helper start an already warmed up engine and run the rpms up to 2.2, 2.5 & 2.8k rpms. Mark each water level with the pen, measure the distance from engine off mark then multiply each by 2.

This is all very simple to do, just hard to explain with words.

woodnnails · 10-04-2008, 05:13 PM

Hi,
I just bought a 97 and it had a leak coming from the turbo oil drain pipe and another slight leak from a pipe under that at the bottom side of the engine.Just another thought that it could be coming from another spot. Didi I just repond to a post thats 2 years old???

illflem · 10-04-2008, 07:41 PM

Nate your numbers are so low that I'm thinking you did something wrong.
Like maybe the drilled hole is too big?

Someone posted here that my numbers had been changed by Cummins, but they weren't that far off.
I used this handy calculator to change lpm to inches Convert For Windows // Josh Madison

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock

09-25-2006, 01:59 PM	#1 (permalink)
future_cummer Newbie Join Date: Aug 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts future_cummer's Truck Pics	How much Blowby? Hello all about a week ago I picked up a 98 1/2 12 Valve 5 speed truck with 260,000 miles on it. I'm wondering about blowby. When the truck is just sitting there idling you can't see nothing, but when you drive it at freeway speeds for a while come home and park it there is oil on the front driveline and all over the undercarriage. I've drove the truck a total of 500 +/- miles and had to add 2 quarts of oil can anyone tell me what is going on with this? The draft tube comes out of the motor and just hangs straight down. I don't think the oil is coming from anywhere else? Any input or advice would be greatly appreciated. I will change my user name and update my sig in the next day or two!! Thanks, Justin __________________ 2000 Ford F-350 CC LWB ZF-6 250,000 + miles, 4" ATS exhaust, Homeade Tymar intake, Wanting more mods.

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09-30-2006, 12:49 PM	#2 (permalink)
illflem Super Moderator Join Date: Nov 2005 Location: Montana Posts: 6,547 Thanks: 5 Thanked 298 Times in 263 Posts illflem's Truck Pics	You need a blowby tool. The Cummins blowby orifice tool is simply a tee with one .221" (15/64-in) outlet. Connect one end of the tee to the end of the blowby tube. Put a manometer on the last tee outlet. That is your blowby tool. They sell them at Cummins, but I have made my own plenty of times, less than $10. A simple manometer can be made by looping into a 'U' 6 feet of clear tubing, fill it with water in it half way. Measure how high the water level rises with a tape measure, multiply it by 2, convert it to LPMs. Rough conversion is 1"= 27 lpm, add 3 lpm for each one inch (1/2'' of rise in the tube) of water The reason for multiplying by 2 is that inches of water equals the water rise in the open end of the tube plus the inches the water is pushed down on the engine side of the water tube. For simplicity my numbers below are the measurement of rise only. Cummins new 5.9 engine numbers are: 63 liters per minute(2.5" water rise) @ 2200rpm, 76 L/Min (3.5" rise) @ 2500rpm 85 L/Min (4.5" rise) @ 2800rpm. Worn engine that needs rebuilding are roughly double i.e. 126 L/Min(10.5"rise) @ 2200rpm 152 L/Min(14.5"rise) @ 2500rpm 170 L/Min(17"rise) @ 2800 rpm Beside indicating a compression problem the valves could also be out of adjustment. Another way (mine), same idea, is to block the blowby tube with a 1/2'' pipe nipple with a cap that has a 15/64 hole drilled in it. Use 3/8'' id looped clear tubing with water in it slipped over the oil dipstick tube. Other tubing end remains open. Use a sharp tipped felt marker to mark the water level with the engine off, have a helper start an already warmed up engine and run the rpms up to 2.2, 2.5 & 2.8k rpms. Mark each water level with the pen, measure the distance from engine off mark then multiply each by 2. This is all very simple to do, just hard to explain with words. __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Not stock

10-01-2006, 11:54 PM	#3 (permalink)
Sea01Cummer Diesel Freak Join Date: Dec 2005 Location: South West Idaho Posts: 836 Thanks: 0 Thanked 0 Times in 0 Posts Sea01Cummer's Truck Pics	Nice instructions, that will help lot's of people. Steve __________________ 2001.5 Dodge 2500 CTD, 6 Speed, Leather,Headache Rack, Edge HOT Juice with Attitude,BD 130 HP Pulse Injectors, 4 inch Exhaust, FE Clutch,Vulcan Big Line Kit, IIS Super Phat Shaft 62/14, Swanker Intake Manifold,ATS Exhaust Manifold,ARP 12 MM Head Studs, HB High Idle Kit, 12v Marine .020 Headgasket. . PICTURES www.industrialinjection.com Dynoed 505/1085 on 8/26/06 :woot2 with water-meth Guns don't kill people.... Husbands that come home early kill people.... Don't Forget To Vote For ROTM

10-02-2006, 01:45 AM	#4 (permalink)
9812VCTD Cummins Fanatic Join Date: Sep 2006 Location: S.E. IDAHO Posts: 115 Thanks: 0 Thanked 0 Times in 0 Posts 9812VCTD's Truck Pics	WOW thanks for that great write-up I don't know what is going on, I went and washed my whole under carriage off and changed my oil and filter. Put in Delo 400 and a Fleetguard Stratapore filter and drove it an hour to a sledpull, around town and back home and was nervous but checked under the truck and there was not a drop of oil anywhere?? I have looked under the truck numerous times and never seen any blowby and the motor runs strong. I was really glad to see no oil. P.S. the oil I drained out of it looked like it had quite a few miles on it, not good. :fist: Thanks, Justin __________________ 1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

10-08-2006, 04:45 PM	#5 (permalink)
Extreme1 Cummins Fan Join Date: Jul 2006 Posts: 35 Thanks: 0 Thanked 0 Times in 0 Posts Extreme1's Truck Pics	Was it overfilled? __________________ Wanted: Blue 95-97 extended cab interior. PM or email me condition and location. '94 3500 4x4, 299,000 miles

10-09-2006, 01:52 PM	#6 (permalink)
9812VCTD Cummins Fanatic Join Date: Sep 2006 Location: S.E. IDAHO Posts: 115 Thanks: 0 Thanked 0 Times in 0 Posts 9812VCTD's Truck Pics	It may of been a little overfilled but not much, I'm thinking of making a CCV system of some kind or maybe get my valves checked they don't sound bad but worth a try? Justin __________________ 1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

10-26-2006, 10:23 AM	#7 (permalink)
*Mopar1973Man* www.Mopar1973Man.com Join Date: Feb 2006 Location: New Meadows, Idaho Posts: 11,239 Thanks: 226 Thanked 667 Times in 515 Posts Mopar1973Man's Truck Pics	Well if you want to create a CCV system a simple idea to look at and modify... http://www.frontiernet.net/~mopar197...kcase_vent.htm Yes I know its a 24V engine setup! But the idea is to get the pipe to run up hill first then back down hill... That will help with the oil blowing up a bit... __________________ Michael Nelson - 2002 Dodge Cummins For Technical Assistance With Your 24V 2nd Generation Cummins - Click Here! Or Search CF.Com for an Answer Remember to smack the *THANKS!* button for those that helped you or you think that post is helpful to others!

10-26-2006, 10:59 PM	#8 (permalink)
inline6359 Newbie Join Date: Oct 2006 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts inline6359's Truck Pics	check your valve covers, mess ed with mine and now my back gasket is leaking. It leaks over the back of the motor and runs down the bell housing and drips on the ground. Just an idea.

11-02-2006, 08:42 AM	#9 (permalink)
9812VCTD Cummins Fanatic Join Date: Sep 2006 Location: S.E. IDAHO Posts: 115 Thanks: 0 Thanked 0 Times in 0 Posts 9812VCTD's Truck Pics	Thanks for the replies appreciate it, I like your ideas on the CCV vent mod I am going to check into doing this, Thanks!:thumbsup Justin __________________ 1998 12 Valve 5 Speed Quad cab Shortbox, 263,000 +, Bullydog 4" exhaust W/5" SS tip, Bullydog 40hp injectors, 100 fuel plate, Southbend FE clutch, Duralite 6637 air filter, Boost Elbow, Auto Meter Ultralite gauges on Pillar thanks DPD, Starwheel and AFC housing full forward, 3K GSK, 15.5* timing, 24V CCV mod, American racing wheels, Fiberglass Ram Air Hood, Custom flame paint job, many more mods to come.

10-04-2008, 05:13 PM	#11 (permalink)
woodnnails Cummins Fan Join Date: Jun 2008 Posts: 57 Thanks: 10 Thanked 0 Times in 0 Posts woodnnails's Truck Pics	Hi, I just bought a 97 and it had a leak coming from the turbo oil drain pipe and another slight leak from a pipe under that at the bottom side of the engine.Just another thought that it could be coming from another spot. Didi I just repond to a post thats 2 years old???

10-04-2008, 07:41 PM	#12 (permalink)
illflem Super Moderator Join Date: Nov 2005 Location: Montana Posts: 6,547 Thanks: 5 Thanked 298 Times in 263 Posts illflem's Truck Pics	Nate your numbers are so low that I'm thinking you did something wrong. Like maybe the drilled hole is too big? Someone posted here that my numbers had been changed by Cummins, but they weren't that far off. I used this handy calculator to change lpm to inches Convert For Windows // Josh Madison __________________ Bill '95 2500 4wd auto '95 3500 5 speed heavy hauler Not stock