My findings after removing head! - Page 3

MG Tom · 22nd March 2014, 19:39

Quote:

Originally Posted by danbmx_69

how else are you ment to check if a liner is loose? to my mind theres no pont putting another gasket on there with out knowing first, otherwise it could rattle away and make it go agin?

Honestly, if they move (spin) then so what? Once clamped down between the head and block they aren't going anywhere! Liner protrusion is the most important thing.

If the liners or flush or low (fortunately none of the 3 I have done have been) then I'd either install shims below the liners or have the block skimmed, but removing the liners is no small job and costs start to escalate with new bearing shells, piston rings etc...

MG Tom · 22nd March 2014, 19:41

Quote:

Originally Posted by Darkxs

OMG that looks like a total engine failure with valves hitting the pistons

Must have been one hell of a thump when happened

Engine locked up. The missing *shattered* piston was my first concern. Conrod was snapped and wedged under the block. Liners cracked and allsorts.

Cambelt was intact too!

SideValve · 22nd March 2014, 19:43

Looking at the corner of the block and head where the leak was - it looks like the mark left by the seal round the rest of the edge disappears. I'd guess that is where the problem lies. Its a narrow area.
It were me I'd check that area to make sure the faces are ok.
Presuming its ok I'd then take a lot of care putting it back together to make sure you don't put any sideways motion on the gasket - its easy to damage the bead of sealant.

If you are happy the faces are flat just make sure they are very clean. There is no point in skimming just for the sake of it.

MG Tom · 22nd March 2014, 19:45

Quote:

Originally Posted by Simon.h

Going back to my question- is the block/liners going to be ok?

And whats the min height for the head?

Thanks.

118.3mm, sorry I thought I had posted earlier.

Yes if you definitely have some liner protrusion then you will be fine. Any less than 2 though then stick with the latest Payen elastomer gasket, and maybe a saver shim.

kaiser · 22nd March 2014, 19:50

I think the block is fine.
The head should be cleaned and checked/measured. And that should include the valves and seats.
I would give it a light skim if in any doubt.
Any good machinist can advice you better than me from your pictures.

marinabrian · 22nd March 2014, 19:57

Quote:

Originally Posted by danbmx_69

have you turned the engine over by hand with the head off to see if any of the liners are loose?

WHAT !! for god's sake don't under any circumstances do that

Brian

Simon.h · 22nd March 2014, 20:10

I will check the height of the head tomorrow as well as clean and measure etc..

Thanks everyone!

beinet1 · 22nd March 2014, 20:28

Your liner protrusions seems OK. From your pictures, it seems that you have had a MLS gasket that weeped coolant externally. Not uncommon with the MLS. New head height is 119mm, skim limit is 118.7mm. You can skim more if you add a head saver shim. Then the head height + skim thickness shall not be below 118,7mm. I don`t think this is to critical, so if you take off a few extra 0,1mm`s it should not be of any harm.
The saver shim supplied with the MLS is 0,3mm thick. 0,5mm and 1mm shim is available, and those need to be bonded to the cylinder head with stag wellseal.

Give the head a slight skim, fit an elastomer gasket and maybe a shim and I think you will be good

MG Tom · 22nd March 2014, 20:36

Quote:

Originally Posted by beinet1

Your liner protrusions seems OK. From your pictures, it seems that you have had a MLS gasket that weeped coolant externally. Not uncommon with the MLS. New head height is 119mm, skim limit is 118.7mm. You can skim more if you add a head saver shim. Then the head height + skim thickness shall not be below 118,7mm. I don`t think this is to critical, so if you take off a few extra 0,1mm`s it should not be of any harm.
The saver shim supplied with the MLS is 0,3mm thick. 0,5mm and 1mm shim is available, and those need to be bonded to the cylinder head with stag wellseal.

Give the head a slight skim, fit an elastomer gasket and maybe a shim and I think you will be good

Indeed.

I quoted 118.3mm which assumes you will be using the head saver shim, but Rover state 118.75mm after skimming as the minimum.

I agree the odd tenth here or there will make no real difference.

Simon.h · 24th March 2014, 10:36

Had a close look at the head.
I'm thinking does it need to be skimmed?

22nd March 2014, 19:43	#23
SideValve Gets stuck in Rover 75 Saloon Join Date: Apr 2012 Location: Oxford Posts: 767 Thanks: 141 Thanked 204 Times in 141 Posts	Looking at the corner of the block and head where the leak was - it looks like the mark left by the seal round the rest of the edge disappears. I'd guess that is where the problem lies. Its a narrow area. It were me I'd check that area to make sure the faces are ok. Presuming its ok I'd then take a lot of care putting it back together to make sure you don't put any sideways motion on the gasket - its easy to damage the bead of sealant. If you are happy the faces are flat just make sure they are very clean. There is no point in skimming just for the sake of it. __________________ The Story So Far: Austin A35, Morris Oxford, Triumph Herald, Mini 850, Mini 1000, Austin Allegro, MG Midget, MGB GT, Rover SD1 2600, Austin Maxi, Rover 200, Rover 825, Rover 800, Bedford TK, Range Rover 3.9 efi, Rover 400, Rover 100, MGF, Rover 25, Rover 75 1.8, Rover 75 Connoisseur SE 2.0 V6, MGF 1.8i, Rover 75 Connoisseur 2.0 V6 Auto, Morris Eight Series E, Morris Minor 1275.

22nd March 2014, 20:10	#27
Simon.h This is my second home Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG Join Date: Mar 2010 Location: Calne Posts: 4,531 Thanks: 8 Thanked 116 Times in 108 Posts	I will check the height of the head tomorrow as well as clean and measure etc.. Thanks everyone! __________________ Previously owned- MG ZT V6 160 Y plate Lpg, MG ZT 190 2003 In Rare Celestial Factory Ordered Lpg MG ZT 190 2004 lpg

22nd March 2014, 19:50	#25
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	I think the block is fine. The head should be cleaned and checked/measured. And that should include the valves and seats. I would give it a light skim if in any doubt. Any good machinist can advice you better than me from your pictures.

22nd March 2014, 20:28	#28
beinet1 Posted a thing or two Rover 75 2.0 V6 Auto Join Date: May 2011 Location: Sandnes - Norway Posts: 1,560 Thanks: 64 Thanked 283 Times in 174 Posts	Your liner protrusions seems OK. From your pictures, it seems that you have had a MLS gasket that weeped coolant externally. Not uncommon with the MLS. New head height is 119mm, skim limit is 118.7mm. You can skim more if you add a head saver shim. Then the head height + skim thickness shall not be below 118,7mm. I don`t think this is to critical, so if you take off a few extra 0,1mm`s it should not be of any harm. The saver shim supplied with the MLS is 0,3mm thick. 0,5mm and 1mm shim is available, and those need to be bonded to the cylinder head with stag wellseal. Give the head a slight skim, fit an elastomer gasket and maybe a shim and I think you will be good