reco heads

[ARQ164 Shane]

Hi all,
I hope you all have a good christmas and an even better new years.
I have been waiting for my engine heads to be ready to go back on
the motor. After one of my number 1 valve guides broke a piece out the side.
The small piece went up into the plenem and down in to number 4.

So I have just got them back today and it has what looks like pinholes
on the face of the head, is this ok?

Cheers Shane

[ARQ164 Shane]

I also posted it on the bb forum .
http://www.alfabb.com/bb/forums/milano-75-1985-1993/277930-v6-head-work.html#post5084002

[Duk]

If the pin hole is clear of the head gaskets firing ring, which it looks like it will be, than that's fine.

[MD]

Agreed.

[ARQ164 Shane]

thank's guys
So im going ahead with put them back together .
wish me luck these are my first v6 heads im putting back together,I'm thinking of replacing the spring on the rocker
shaft with sold bushings eg cut alloy tube to fit .
what do you guys think ?

cheers all

[ARQ164 Shane]

hi guys,
I finaly got around to fitting my head to the motor, Went back together without a hitch or
so I thought.
I have done something wrong not sure what.
I put on the timing belt and all the right lines line up. Both cams, dizzy, tdc etc.
So I have no compression in 6 and 5 cyclinder, about 60psi in 1, 4 & 120 psi 2, 3??? and I have noticed that the timing belt goes tight when turned over then loose the next, then tight again.
Note that I have not fitted the spark plugs yet.

[colcol]

Make sure that you have the head gaskets in the right way, not upside down or 180 degrees out, the bolts will still go in, but the cylinder heads won't seal.
The timing belts go loose and tight as the valves open and close, sometimes all the valves will be open and the belts are under tension and tight, when the valves are closed, the belts will be under no tension and loose.
On a Alfa Boxer, you have to set the timing belt tension with all the valves closed, so that when you set the tension the cam is free to rotate, not sure on a V-6.
Also make sure that the banks are on the right stroke, ie on compression stroke, you can have the cams out 180 degrees and the motor won't have valves and pistons coliding, but it won't be building up compression, i don't quite know how to check this offhand, look on the internet somewhere and someone will explain it better than i can, Colin.

[ARQ164 Shane]

thank's colcol,
I spend 20mins put the head gaskets i will really kick my self if i put them on backwards.
thank for the heads up on the timing belt, i thought i may have had a bent cam.

I tight the head down to 98nm like the book said, Is that tight a enough ?
There is no water in the block only oil about 5lt.

[colcol]

Tighten the fasteners to what the book says, if it says 98 newton metres, then thats the final torque, make sure the bolts are done up in seqeunce, ie don't tighten the first one to 98 n.m. then the second one to 98 n.m., there is a tightening order and start off and say do them all to 30 n.m. then 60 n.m. and finally tighten them all to 98 n.m., make sure that if the fasteners are meant to be oiled or not oil, it will make a difference to the final torque, Colin.

[ARQ164 Shane]

Hi All,
So i have retighten the heads to 100nm each and while I was doing that I noticed that the motor had no gap on the left cam (inlet side) I tried to put a filer gauge but connot even get the thinest one between them.
Are all the shims height in the V6's?

Cheers

[shiny_car]

The shims may need to be different heights. Only two of mine were the same, the other four different.

[ARQ164 Shane]

Hi Richard,
What size filer gauge did you use to set your inlet valves too ?
So i have 2 cylinder at 120 psi 2 @ 60 psi & 2 @ zip psi .

[shiny_car]

What size filer gauge did you use to set your inlet valves too ?

I just followed the workshop manual: 0.475-0.500mm (0.018-0.0197").

I have a photo where I labelled the clearance on one valve as 0.018".

[Mick A]

It sounds like something is wrong mate. Take it to your mechanic if you don't know what you are doing.

It's a bit hard to diagnose when nobody here can actually see what you have done. 

[ARQ164 Shane]

gday
a small update. IT LIVES!!!!:P
I thought about the ideas that have been given to me off the forum and end using a fine stone to sand down the shims from 1.6 to 1.3 on number 6 cyc and got 50psi and all the others were about 65, 110, 120 etc
So I fired it up first pop and killed it(stop it with the key).
Started it once more for 1 min and killed again. All the cyc are now at the 100 mark so this weekend I
will be filling it with coolant.
Wish me luck
p.s. it's only been two bloody years since it broke.