Gents,
I am putting back the cylinder heads after having changed the cylinder head gaskets. (coolant leak) It's a
-99 V8 Disco. Should the bolts be renewed? What is the specified torque?
Rgds
Peter

 

Yes, the bolts must be renewed but I can't tell you what the torque specs are.
Mike

 

Ok, this is what I got for a Disco 2 V8, let me know if you have something different :

TORQUE WRENCH SETTINGS
Engine V8
TORQUE DESCRIPTION METRIC IMPERIAL
Engine mounting bolts (rear, LH & RH) to gearbox bolts 85 Nm (63 lbf.ft)
Engine mounting (rear, LH & RH) nuts 45 Nm (33 lbf.ft)
Cylinder head bolts tighten, then 90 degrees, then a further 90 degrees 20 Nm (15 lbf.ft)
Rocker shaft bolts 40 Nm (30 lbf.ft)
Alternator mounting bracket 40 Nm (30 lbf.ft)
Auxiliary drive belt tensioner 45 Nm (33 lbf.ft)
Engine earth lead 22 Nm (16 lbf.ft)
Rocker cover bolts 8 Nm (6 lbf.ft)
Torque converter to drive plate 50 Nm (37 lbf.ft)
A/C compressor 22 Nm (16 lbf.ft)
ACE pump 22 Nm (16 lbf.ft)
Flywheel to crankshaft 78 Nm (58 lbf.ft)
Crankshaft sensor 6 Nm (5 lbf.ft)
Crankshaft sensor cover 6 Nm (5 lbf.ft)
Spacer and hub to crankshaft 85 Nm (63 lbf.ft)
Drive plate and clamp ring 45 Nm (33 lbf.ft)
Oil pick up strainer 10 Nm (7 lbf.ft)
Filter head adaptor 13 Nm (10 lbf.ft)
Filter head 8 Nm (6 lbf.ft)
Sump bolts 22 Nm (16 lbf.ft)
Oil pressure switch 15 Nm (11 lbf.ft)
Timing gear cover to cylinder block 22 Nm (16 lbf.ft)
Oil cooler pipe to timing gear cover 15 Nm (11 lbf.ft)
Crankshaft pulley bolt 270 Nm (200 lbf.ft)
Coolant outlet elbow 22 Nm (16 lbf.ft)
Auxiliary housing 40 Nm (30 lbf.ft)
Jockey pulley 50 Nm (37 lbf.ft)
Camshaft gear 50 Nm (37 lbf.ft)
Rocker shaft bolts 40 Nm (30 lbf.ft)
Connecting rod bolts
Final torque - turn through 80 °
20 Nm (15 lbf.ft)
Initial torque - all main bearing cap bolts and side bolts 13.5 Nm (10 lbf.ft)
Final torque - main bearing cap side bolts 11 to 15 45 Nm (33 lbf.ft)
Final torque - main bearing cap bolts 1 to 8 72 Nm (53 lbf.ft)
Final torque - main bearing cap bolts 9 and 10 92 Nm (68 lbf.ft)
Final torque - main bearing cap side bolts 16 to 20 45 Nm (33 lbf.ft)
Viscous fan nut 45 Nm (33 lbf.ft)
Camshaft thrust plate bolts 22 Nm (16 lbf.ft)
Secondary Air Injection adapters 33 Nm (24 lbf.ft)

I listed it all just in case you wanted it. I copied this out of the Workshop manual. I got it for free from rover-renovations.com. Just search for the RAVE cd. If you do much work yourself, you might want to get one, it is free, after all....

Good luck!

 

thats correct

 

Remeber theres a sequence involved with the head bolts (inner to outer) when tighting them.

 

You need to purchase new bolts. They are stretch bolts which can only be used once. When you buy them you will receive torque instructions. The torque instructions for the bolts I purchased were a little different than the instructions in the manual. Good luck!

 

Don't forget to use locktite if you want the leak to stay away.

 

Here is the procedure for the head bolts. Go through the torque sequence and bring them allup to 15 ft. lbs. Then -- make a mark with white-out on the bolt head (a vertical line), and go through the torque sequence again --- this time indexing the bolt so your reference line rotates 90 degrees. And finally, start the torque sequence for a third time, and index the bolt another 90 degrees ---- and you are done. These are "stretch bolts" and youwill need a 1/2" socket and long breaker bar to achieve the proper stretch. The bolts are designed for one use only --- then you throw them away.

regards,

Geoman
www.eurotekapg.com
925-335-2669

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