Head Gasket replacement

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Originally Posted by Pedro_The_Swift

What are you thinking Peter?

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G`day Pedro ,

mostly very little and only my opinion but from the carbon/gunk in the pic it looks like a spend a lot , do a lot or a spend a little do a little engine .

If the rocker gear are as such so will the rings and pistons be carboned and i would imagine the bigs and mains won`t be pretty ETC .

Sometimes ( if the pic is an indication of the rest of the engine condition ) it is better to leave the carbon be rather than loosen it and allow it to make its way around/through the engine , many a running engine has been killed by well intentioned cleaning .

Yea Pete,, I got some of that just by googling how to clean the gunk off. :(

oven cleaner?!? :confused:

Hi

I spoke to the guy who did my heads and he reckons because it is a gummy kind of deposit rather than hardened carbon then an engine flush will be fine

The entire top end is now very clean :cool:

Steve

Had exactly the same gunk in my engine, cheap oil and 20k services all its life in Melbourne.

I ran the nulon oil flush (after physically cleaning as much as could be), and have simply done 10k services and it's a golden brown colour now. That was 30k km ago.



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Quote:

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Originally Posted by benji

Had exactly the same gunk in my engine, cheap oil and 20k services all its life in Melbourne.

I ran the nulon oil flush (after physically cleaning as much as could be), and have simply done 10k services and it's a golden brown colour now. That was 30k km ago.

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Benji

That's a relief to know. I have been doing 10K oil changes since I fitted the motor but the buildup was obviously present at that point.

Heads go back on today :D

Steve

HI

In terms of sealant I have decided to

a) Use a spray of hylomar on the head gasket

b) Use Permatex black on the valley gasket

I note the permatex black says to put it on, hand tighten until some silicone oozes out, then leave for 24 hours before torquing. Has anyone else done this ?

c) Use a smear of Mani-seal on those pesky exhaust gaskets !

Hopefully that will keep things good for at least another 50K :angel:

Steve

just in case you havent already decided--
on stud torque,,
on the previous previous (using studs) build, composite gaskets and 70lb was used and failed, 18months. British Off Road used a comp gasket and "torque it down with OE bolts then replace with studs" method,, it too failed, 18months.
This time I used MLS and 100lbs.

Good O!:D
I have come to the conclusion everything that carries fluid needs to be glued.

Good Luck with the build;)

Well as Pete surmised and as I feared the rocker gear is none to healthy.

When I saw the muck under the rocker assemblies my first thought was oil starvation and sadly that looks to be the case.

There are grooves in the rocker shafts and of course corresponding wear in the rockers :(

So it's a set of rockers as well, I am not a happy camper :mad:

Lets hope the bottom end bearings are in better shape because their oil galleries are much bigger and less likely to get clogged up

Steve

Steve, I know its not a good time:angel:,, but any chance of some pics of the wear/grooves?