cummins nh220 engine

[carman2]

hi to all dk members could anyone help me with the torque specification an tightening sequence of the connecting rod an main bearing and cylinder head bolts on a nh 220 cummins engine it an old engine so i hope i could get some help tank u .

[jctech]

Does your engine have 6 head bolts?

Con Rods -
lube the threads.
1st stage - tighten both nuts evenly to 140 lb.ft.
loosen both nuts completely, not the cap.
2nd stage - tighten both nuts evenly to 55 lb.ft then turn 60 degrees (1 hex)

Main Caps -
lube the threads.
1st stage - tighten both bolts evenly to 150 lb.ft. then turn 30 degrees (0.5 hex)
loosen both bolts, not the cap
2nd stage - tighten evenly to 140 degrees, then rotate the bolt a further 30 degrees (0.5 hex), check the crankshaft end float, 0.007" - 0.013". if end float is OK lock the locktabs.

This is for 6 bolt heads -
lube the bolts, keep the gasket dry.
Tighten from centre to ends in a criss cross pattern to 450 lb.ft., in 100 lb.ft. steps.

[carman2]

tanks for the info an yes it is a six bolt cylinder head for d main bearing in d second step do i torque 150 first an then 140 degress or just do the 140 an then 30 degress also the injector hold down bolts torque an timing torque it has a allimuim rocker box cover if u have it .

[jctech]

tanks for the info an yes it is a six bolt cylinder head for d main bearing in d second step do i torque 150 first an then 140 degress or just do the 140 an then 30 degress also the injector hold down bolts torque an timing torque it has a allimuim rocker box cover if u have it .

The steps quoted are direct from the manual

150, loosen, 140 + 30 degrees

[jctech]

Injector hold down bolts
original 12 lb.ft.
new type with nylon insert 14 lb.ft.
fuel connectors 20 - 25 lb.ft.
no torques available for rocker housing or front cover

[carman2]

hi jcteeh when i torque main bearing to the 150 +30degress crank shaft spin fine lossen an do the 140 degress crank shaft locks up is there any other torque for d nh 220 it a non tourbcharge engine if there is a diffrence really need help with this one

[Poptest]

hi jcteeh when i torque main bearing to the 150 +30degress crank shaft spin fine lossen an do the 140 degress crank shaft locks up is there any other torque for d nh 220 it a non tourbcharge engine if there is a diffrence really need help with this one

I think you have bent crank or insufficient oil clearance.

[jctech]

hi jcteeh when i torque main bearing to the 150 +30degress crank shaft spin fine lossen an do the 140 degress crank shaft locks up is there any other torque for d nh 220 it a non tourbcharge engine if there is a diffrence really need help with this one

150 lb.ft., loosen, 140 lb.ft + 30 degrees.
150 lb.ft. plus 30 degrees will be too much

check your main bearing bores 4.749" -4.750"
crank journals 4.497" - 4.500"
check bearing clearances with plastigauge 0.0015" - 0.005" new (0.0015" - 0.007" used)

[carman2]

ok i check it an see what i come up with