3 Litre Head Bolt Torques

[Deleted]

Hello everyone, I'm just about to put the head back on my 1961 P5 and have no idea how many torques its gonna need.. Can anyone help??

[jlalexander]

A A A A A A A
12 8 4 2 6 10 14

A A A A A A A
13 9 5 1 3 7 11

B B B B B B
19 18 15 16 17 20

tightening sequence( A bolts are under the rocker cover)

bolts A : 50 lb/ft
bolts B : 30 lb/ft
Don't forget to bolt the dynamo bracket on before putting the head on

[Phil Nottingham]

And check again after 500 miles engine stone cold.

I have fallen for not bolting on the bracket!. It does not mention that in the manual

[Deleted]

hoping to get some info on this for a friend with a 1971 p5 coupe... would these settings be the same for his car? hes asked me to find out some info for him... thanks x

[Phil Nottingham]

Absolutely not - w/s manual is really essential but settings are (stone cold)

65-70lbs ft for the the thick bolts and 40-50 for the 3/8ths bolts on the outside.

Tighten in 3 stages not all in one go

The order is also critical with the inner centre one first the 2nd-3rd to the back and 4th & 5th to the front

The middle row ie 6th bolt again starting in the middle then 7th - 8th to the back and 9th-10th to the front.

The outer shorter row nearest the exh manifold starting from the back to the front.

Its easier to see the diagram.

BTW a special lubricant/sealant shold be used to avoid wrong torque settings although I have never had any problem as long as the bolts are clean and very lightly oiled and screw into the holes easily (make sure the holes are not full of oil otherwise the block will split!

The order should be reversed undoing them but that may be too late

the 3 Litre head is basically a flat block of cast alloy bolted to a stiff cast iron block.

the V8 heads are intricate lightweight alloy castings bolted a similar delicate alloy block and either can be distorted by uneven bolt torques

[harvey]

The thread sealant won't really cause problems on reassembly, but it will, if not used cause REAL problems if the engine is stripped in the future. The last V8 I took the heads off had been previously assembled without it and about 6 bolts pulled the threads out with them and one snapped off in the block. Be warned.

[Deleted]

would like to apologise what with me being female! i have just reread what friend needed to know and missed out that its actually a v8! sorry...... is this the same? will i have to post in other section? thanks tam x

[Phil Nottingham]

Forgiven then - its OK in this section anyway

[Kev]

Tam, why are you called Spanky, is there something we should know?

I think all this talk about head bolts..............you could be on the wrong site!
BigKev.

[Deleted]

aaah that would be telling! and yes im sure im on the right website! hahahaha