MBE4000 Main Bearing Bolt torques Caution - stretch bolts refer to manual for limits step 1 = 100 Nm, 74 lb.ft step 2 = 200 Nm, 148 lb.ft step 3 = 300-330 Nm, 221-243 lb.ft step 4 = + 90°
MBE4000 Connecting Rod Bolts Caution - stretch bolts refer to manual for limits step 1 = 100 Nm, 74 lb.ft step 2 = + 90°
MBE4000 Cylinder head Bolts Caution - stretch bolts refer to manual for stretch limits step 1 = 10 Nm, 7 lb.ft step 2 = 50 Nm, 37 lb.ft step 3 = 100 Nm, 74 lb.ft step 4 = 200 Nm, 148 lb.ft step 5 = + 90° step 6 = + 90°
Detroit Diesel MBE4000 Cylinder head Bolts are stretch bolts!
The MBE4000 head bolts, because there are stretch bolts, loose their clamping force on reuse, and unless they are strictly within the manufactures stretch limits, should not be used again otherwise leaks will occur.
Stretch bolts, when properly torqued, loose some of their diameter to the stretch, but in correct use are elastic, and if variations in the gasket material or other things occur they keep their clamping force by varying their diameter slightly, but frequently, like breathing. The clamping force of stretch bolts is necessary to retain the inevitable variations of the cylinder head and its composite gasket material deformations due to heat etc. and they automatically keep the necessary clamping force on the head gaskets for them not to not leak.
Steve, BDC, Nov 2017
Not withstanding the above technical information, some owners have chosen to replace the stretch bolts with non-stretch studs and nuts, which I am told, are doing a good job resulting in a leak-free engine.
Steve, BDC, April 2018
MBE 4000 DDEC stats Top Speed Highest recorded speed 96 mph, 154 kph Current Milage 1,231,371 miles, 1,981,645 kilometers Fuel Consumption 5.83 US gal/hour 22.07 liters per hour Fuel Economy 6.49 miles per gallon 2.759 kilometers per liter 36.24 liters per 100 km Goodness, what a good servant!
MBE 4000 Arrangement Inline 6 Cylinder turbocharged MBE 4000 Displacement 12.8 liter, 781 CID MBE 4000 Bore 128 mm, 5.04 in MBE 4000 Stroke 166 mm, 6.54 in
MBE 4000 Compression ratio: 18.0:1 MBE 4000 Weight approx: 1030 kg, 2270 lb MBE 4000 Electronics DDEC VI
MBE 4000 Power from 370 hp, 276 kW @ 1900 rpm to 450 hp, 336 kW @ 1900 rpm MBE 4000 Torque from 1250 lb.ft, 1695 Nm @ 1100 rpm to 1550 lb.ft, 2100 Nm @ 1100 rpm
MBE 4000 Dimensions approx: length 1339 mm, 53 in width 1069 mm, 42 in height 1130 mm, 45 in
Basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque. Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques.
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Page Revision #8.1RS 04-18