Blowby Limits
BLOWBY LIMITSThe following table gives the values of blow-by that are normal for the Dodge 5.9 Liter Diesel engines. These blow-by values have been calculated on amount of displacement of the engine, volumetric efficiency, cylinder pressure and turbo contribution.
Engine Model 5.9 Liter Diesel
Speed/RPM 2500
New Unit 76L/Min [7 In H20]
Worn Unit 152L/Min [28.5 in H20]
NOTE: The blow-by values are for 100 percent load at the given speed.
BLOWBY MEASUREMENT
Blowby is generally recorded in Liters/Minute, but a water manometer may be used to measure blowby from the breather tube. Pressure readings in inches of water are measured using a 5.613 mm [0.221 inch] diameter orifice.
Use a service tool with 5.61 3mm [0.221 in.] orifice built in.
BLOWBY CONVERSION CHART (5.613 MM [0.221 ML ORIFICE)
Inches of Water Liters/Minute
1 27
2 40
3 49
4 58
5 64
6 71
7 76
8 81
9 86
10 90
11 94
12 98
13 102
14 105
15 109
16 112
17 115
18 118
19 121
20 124
21 128
22 131
23 135
24 137
25 140
26 144
27 147
28 150
29 154
30 157
31 180
32 163
33 166
34 169
35 172