Peugeot 306 Head Bolt Torque?

[ABRecovery]

Hi, just started doing my mates head gasket and realised I've lent out my Haynes manual,
searched the web but can not find the torque wrench settings, and tightening sequence
anywhere....pls can anyone help? Vehicle is a 1993 PEUGEOT 306 1.4 PETROL
(Engine code TU3M/Z). Thx in advance!!!

[AndersDK]

No info found on the bolts or headgasket packaging ?
Usually you have a very good instruction here.

The basic all-aluminium 1.36L TU3engine (taken from a BX14 with K1G engine) :
Step 1 : torque to 21Nm/15LbfFt
Step 2 : angle tighten a further 240deg.

Observe the correct order of tigthening sequence, i.e working in circles fom the mid bolts to the outer bolts.

TIP : if you are a bit anxious, then its definately not wrong to get at the 240deg (step 2) in 2 or more steps. (I prefer to do this)

[ABRecovery]

I tried this but I'm not 100% sure on doing the angular bit using the gauge I have, all seemed to be going well, then 'C L I N K' I snapped the rocker assembly!! Is there a fool proof way to do this angular bit pls?

Suprisingly there was NO info on the gasket/bolt set, and it was a decent make 'FAI'!!

[AndersDK]

I tried this but I'm not 100% sure on doing the angular bit using the gauge I have, all seemed to be going well, then 'C L I N K' I snapped the rocker assembly!! Is there a fool proof way to do this angular bit pls?

Using a homemade cardboard disc with a square centerhole and some simple angular markings in degrees - is all you need.
Then of course you decide first off how many degrees you do up the bolts pr sequence - if you do it over a couple of sequences.

What you mean by snapping the rocker assembly ?
the cam axle ?

Before bolting down the cylinder head, Did you then check that either :
1) the cam axle in the cylinder head was locked at index by its sprocket - AND likewise the crankaxle locked at index by its flywheel lockpin hole ?
-OR-
2) All pistons were set to mid travel down the cylinders in the block ?

This to prevent the valves and pistons contacts each other very intimately during head re-assembly. Trying to bolt down a cylinderhead with a protruding valve into a locked piston may well snap the camaxle, bend the valve, and even damage the piston.

Why did you & pal decide replacing the headgasket in the first place ? Because of an engine overheating thus damaging the headgasket ?

This will ALWAYS require the cylinder head to be re-milled for a 100% even gasket surface. The factors doing this will also do a cylinder head inspection, making sure you are not re-fitting a cracked cylinderhead.
If you skip this expense - you now know one of the possible outcomes

IMPORTANT NOTE :
You MUST purchase new headbolts and headgasket now AGAIN - when refitting a new head - or the repaired head.
If not - you are in even more deep ...

HINT :
It is perfectly "allowed" to lube the headbolts - using an oil wetted rag. I.e. the bolts must not be wet dripping oily.

[ABRecovery]

It's not any of the actual rockers that have snapped, it's the assembly that they're mounted on. imagine standing at the front of the engine, looking down (birds eye view), the head bolt hole in the top left-hand corner is where the assembly snapped. Yes they're new bolts. Pistons 1 & 4 are up, centre two down, this is how it was set when i dismantled it. I'm thinking maybe I made mistake by tightening upto 20 Nm in one go, not in stages? Thx

[AndersDK]

I'm thinking maybe I made mistake by tightening upto 20 Nm in one go, not in stages? Thx

Not good. Like doing one wheelbolt at a time to the specified torque in one go. Always try to even out any stress on components when torquing down bolts - do it in several stages ...
Could well be the cause.

[ABRecovery]

Well the replacement rockers came and I've fitted them, only question now is how on earth do I adjust the rockers so the engine doesn't sound so rough? I've set engine to TDC, inserted timing pins, should some rockers be loose and some tight? Well stuck now!

[pugxpert]

you will have to adjust the valve clearances on each valve 8 in total, do this when the valve is fully closed and the lobe of the cam is not near the rocker,pull cylinder head down to correct torque as anders describes before adjusting valve clearances, you will need some feeler gauges 0.2mm inlet valves and 0.4mm exhaust valves...

[Brian UK]

The "add up to nine" rule.
When no 1 valve is fully open, check and adjust no 8.
When no 2 is open, check no 7 etc.
However, in the circumstances, I would advise you to get that copy of Haynes back and read it before you cock something else up.

[ABRecovery]

You lot amaze me, thanks so much for all your help. Can't get Haynes back as it's hike to collect it. The head is all torqued down, went well this time and found problem from last time......little rolled pins that sit in the rocker assembly and fit into holes in head....well I'd left one in the head and one in the rocker ass so when i tightened bolts it was trying to fit pin into hole which already had pin in it.......my mistake and i took the cost of new rockers, only fair i thought. Add to nine rule is new to me and sounds great so I'll be trying that later today.......can't wait to get this car out of my garden and my mate back on the road. It's cost him £210 in total, inc head, gaskets, bolts and labour, oil etc.....not too bad i don't think? Just a thought, how will i know when each valve is open? Thx

[ABRecovery]

Right, set up all the valve clearances, thx for info on that, got her up and running, attempted to bleed up cooling system and the NUGGET (my mate) must have put a raw egg into the system at some point cos little bits of egg white were being forced out the bleed holes.....so gonna flush the system out totally.........got big job on tomorrow on another mates car and this pug supposed to be done for sunday night as he's workin nights next week!!! The car 'back-fired' a couple of times so i think timing nay be slightly out. Would that cause this?

[Brian UK]

Seems to me that if you have had the nerve to actually charge him for labour, even though you clearly don't know what you are doing, you owe us that money.