Om642 torque specs

[WeeRobbie]

Hi there.sorry if this has been asked before,but i am a new member and can't find any torque specs for the om642 engine.specificaly the big end bolts,main bearing bolts and heads.if anybody could help it would be much appreciated.cheers.

 

[spike60]

I probably can supply info from Autodata but it's all fairly involved, 10 stages to tighten the heads down for instance. It also says to replace the con rods as well as the bolts when doing the big ends, I would think it'll be an expensive job. It would be better if you supply detailed info on the model rather than me guessing and hoping it's the same as yours.

 

[WeeRobbie]

Hi there.sorry for the late reply.the car is an e350 CDI w212 model,with the om642.850 engine.the engine had spun No1 rod bearing.ive had the crank reground and have the new bearings.i also have all new genuine Mercedes bolts.cheers.

 

[spike60]

Details have some protection so I can't copy and paste.

Cyl head. Max bolt length 207 mm
1. Bolts 1-8 10Nm
2. M8 20Nm
3. 1-8 60NM
4. M8 20Nm
5. 1-8 90deg
6. M8 20Nm
7. 1-8 90deg
8 M8 20 Nm
9. 1-8 90deg
10. M8 20 Nm

Mains. Use new bolts.
1. 35Nm
2. 95deg
3. 95deg
Side bolts
1. 53 Nm
2. 95 deg

Big ends.
Use new con rods and bolts. A = short side of rod, B = long side
1. A 15Nm
2. B 20Nm
3. A 30Nm
4. B 40Nm
5. A 40Nm + 90deg
6. B 90deg
7. A 90deg
8. B 90deg.

 

[spike60]

Head bolt numbering.

Left head
7 is left front
6 2 3 7
5 1 4 8

Right head
7 is right front.
5 1 4 8
6 2 3 7
Hope this all makes sense, details for a 2011 car

 

[WeeRobbie]

Cheers m8.just got my new torque bar so will crack on tonight.thanks again.