How much is excessive blow by in a 5.9L cummins?
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 last tee outlet. That is your blowby tool. They sell them at the 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 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.
Who knows 94 dodge ram 2500 59l v8 my oil pressure drops when i accelerate and will go back up once i release the pedal at o?
The reason for this is probably afaulty gauge, or ( this depends on how much oil you have in at the time ) when you Axel your oil temp will rise but not drastically and as you idle or sit at 0 it will slightly cool. Also check the amount of coolant you have in your radiator. If any more questions please email me Ryanrente@yahoo.com , ( I own and work at a custom shop…
1996 Dodge Ram 1500 59l v8 dies when you let off of the gas Could this be a clogged fuel filter if so where is it?
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Some blowby is normal in all engines, this is the reason for the pcv system (positive crankcase ventilation). excessive blow by, is the cause of worn pistons and or piston rings. excessive blowby will alot of times show up in the air cleaner box as raw oil that the pcv system just could not handle. If indeed you do have excessive blowby it is a major internal engine failure. Again blowby is normal in all…