Re: [diesel_mercedes] Ludwig Rides again! Torque spec for little allen-head head bolts?

Not sure this covers your situation but I had it available for general engine torquing on my 300D.  -  brian

TORQUE SPECIFICATIONS

Application		Ft. Lbs. (N.m)
Cylinder Head (Hex Head Bolts) (1) (2)
Step 1		51 (70)
Step 2		66 (90)
Step 3		73 (100)
Cylinder Head (12-Point Head Bolts) (1) (2)
Step 1		30 (40)
Step 2		51 (70)
Step 3		Tighten cyl. head bolts 1/4 turn (90°angle)
Step 4		Tighten cyl. head bolts 1/4 turn (90°angle)
Rocker Arm Support Bolts		29 (39)
Prechamber in Cyl. Head		108-130 (157-177)
Nozzle Holder in Prechamber		51-58 (69-79)
Glow Plugs		36 (49)
Connecting Rod Caps
Step 1		28-36 (40-50)
Step 2		Tighten nuts an additional 90-100°angle
Main Bearing Caps		65 (88)
Crankshaft Front Hex Bolt		195-239 (265-325)
Camshaft Sprocket Bolt		58 (79)
(1) Setting time between steps 2 & 3 is 10 minutes. (2) Following area the dimensions of the double hex cylinder head bolts (M 12): new = 104 max length = 105.5; new = 119 max length = 120.5; new = 144 max length = 145.0

Eric Ditwiler <Eric_Ditwiler@hmc.edu> wrote:

The rebuilt head and turbo are in my 82 300CD.

Turbo blows 13psi and that is close to the upper limit of 13.25.

One remaining issue: I could never find the proper torque for the 3 little allen head head bolts and apparently did not torque them sufficiently as I have a leak between the head and the block at the back side of the little cul de sac that houses the chain. One is under the cruise control (which I am now glad I did not reinstall) and the other two are under the valve cover on the inside of the front facing portion of the head.

Does any one know the torque for the little head bolts

brian from la verne, ca

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