Discovery 2 Head Gasket

Farmer Fred · Jul 19, 2010

Hi Can anyone give me some advise.
I have just taken the heads off of my Discovery 2 the gasket on one side had a small hole in it from one cylinda. There were no water leeks and the engine has not boiled over. Had a good look round and other than a bit of carbon all looks OK. Discovery was run well even with the hole in the gasket letting pressure out.

My questions are.
Will I need to have the heads skimmed.
What else should I look at before bolting it back together.
The discovery has covered 104 thousand. Will it need piston rings.

Thanks

lookskyward1 · Jul 19, 2010

I have to ask, why did you take the heads off in the first place? Was there a problem?

If the engine has not overheated and you took the heads off in the right sequence I would not bother with getting the heads skimmed, although it would give you piece of mind if you do.

I have just opened up the engine I took out of my D2 suspecting a slipped liner only to find a failed head gasket. The engine has covered over 129,000 miles and I was amazed to find how good a condition the cylinder bores were, I could still see the original machining /honing marks on the bores. So my first thoughts is you will not need to change the piston rings.

AncientGeek · Jul 19, 2010

104K? Its hardly run in yet.

fett · Jul 19, 2010

check there flat and the liners have not slipped

guinness · Jul 20, 2010

hi i did 179000 in mine before i decided to rebuild from top to bottom.

thanks

demitrious1973 · Jul 20, 2010

when i took my heads off my v8 when i done some head work i had them skimmed and i bought new head gaskets and new bolts, better to be safe than sorry

Farmer Fred · Jul 21, 2010

Hi
Thanks all for the advice.
I took the heads off in the first place as there was a hole in the gasket on no.7 cylinda letting the pressure out and sounding like an old hit and miss engine.

The heads have not overheated as there were no water leeks and I took the bolts out in the correct order.

When I looked at the rest of the engine all seemed OK and I could also see the original honing / machine marks on the liners.

I got the full head gasket set which came with all the bolts. Already had a problem with a sheared bolt.

When I was removing the exhaust manifold a bolt sheared. I have sprayed it with everything I can think of and tried to get it out with some grips this didn't work. I cut a slot in it used mild heat and an impact driver this didn't either.

Not one to give in I have seen some extractors which look quite good and I am hoping they will do the job. Not the left handed thread things these have a spline on them a bit like torx, you drill a hole hammer them in and screw the bolt out or so I have been told.
Anyone ever used them.

Thanks

Farmer Fred · Jul 21, 2010

Can I use a steel ruler to check that the heads are flat.

Thanks

lookskyward1 · Jul 21, 2010

Farmer Fred said:
Can I use a steel ruler to check that the heads are flat.

You could but would not get a very accurate reading in two planes, try a sheet of glass.

Good luck with the broken stud:doh:

Farmer Fred · Jul 22, 2010

Thanks I didn't think of using glass

fett · Jul 22, 2010

Farmer Fred said:
Hi
Thanks all for the advice.
I took the heads off in the first place as there was a hole in the gasket on no.7 cylinda letting the pressure out and sounding like an old hit and miss engine.

The heads have not overheated as there were no water leeks and I took the bolts out in the correct order.

When I looked at the rest of the engine all seemed OK and I could also see the original honing / machine marks on the liners.

I got the full head gasket set which came with all the bolts. Already had a problem with a sheared bolt.

When I was removing the exhaust manifold a bolt sheared. I have sprayed it with everything I can think of and tried to get it out with some grips this didn't work. I cut a slot in it used mild heat and an impact driver this didn't either.

Not one to give in I have seen some extractors which look quite good and I am hoping they will do the job. Not the left handed thread things these have a spline on them a bit like torx, you drill a hole hammer them in and screw the bolt out or so I have been told.
Anyone ever used them.

Thanks

easy-outs, they are ****e ,normally break off inside leaving you something too hard to drill out.

Have you tried filing two flat sides on it and then using a spanner?

vougese39 · Jul 24, 2010

check the cam and followers for wear at that milage very coman have the heads checked turn engine check bores for rust points and water rings stained on the bore means block issues

Discovery 2 Head Gasket

Farmer Fred

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lookskyward1

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AncientGeek

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fett

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guinness

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demitrious1973

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Farmer Fred

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Farmer Fred

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lookskyward1

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Farmer Fred

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fett

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vougese39

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