Liner Shims 2.5 KV6

[springeraust]

Re-assuring words, I shall look into that if I have to, thanks again.

[beinet1]

Originally Posted by springeraust

Thanks for the quick reply Fellas, Having checked and rechecked the protrusion on this motor, it appears to be .07mm (approx. .00275"). I understand it should be between .004 and .005" so if I put the shims in it will raise it too high particularly as a posting on this forum said the shims are actually .004" thick. I'm wondering if I should just try a new gasket with new head bolts and see how it goes. What are your thoughts?

Hi there,

My thoughts:

The factory specification for liner protrusion is 0-0,075mm. In your case, I would not do anything with them. Only refit with the best quality gasket available.

The rumors says the MLS gasket needs a liner protrusion of 0,075-0,1mm (0.003"-0.004"), but I have not seen any official MGR or LR documents stating this.

The KV6 is of a different design than the K4. It does not have the long through bolts for example and HGF is not common in the same way as for the K4`s, so not all of the same issues applies.

The KV6`s was factory fitted with a MLS gasket from the start, so these gaskets may look different than the typical K4 aftermarket MLS gasket.
Remember to replace the cylinder head bolts as these are of the stretch-to-yield type as commonly used on most engines.
I think the short head bolts gives a more stable clamping force of the cylinder head than the long bolts on the K4, making the KV6 more suitable for MLS gasket s than the K4.

[springeraust]

G,day Beinet1, I have started to put the heads back on today with new head gaskets and bolts, I must admit I have spent a considerable amount of time reading posts on the forum trying to find the figures you have provided during which I have read many of your in depth reports and those of others which I have found very helpful. It is obvious the 4K has more head gasket problems than the V6 just by the number of posts on the subject, (or maybe there were many more 4k than KV6 motors sold in the cars). Thank goodness for this web site which I regard as "The Living Rover 75 MGZT Encyclopedia.'

[minimutly]

There were more k4 sold than v6es, loads more. And the fact that the v6 never used an elastomer gasket that only lasts 7-10 years also has a huge bearing.
Myself I don't believe there was much wrong with the k4 1400, other than the gasket. The 1.6/1.8 should have been redesigned with a thicker liner, even with a flat on each side would have been an improvement IMHO.
When you can tune these things to 280 odd bhp there can't be much wrong with them.
Who won the manufacturers championship last yr, with a 30 year old engine design....

[Doc Evil]

Originally Posted by beinet1

Hi there,

My thoughts:

The factory specification for liner protrusion is 0-0,075mm. In your case, I would not do anything with them. Only refit with the best quality gasket available.

The rumors says the MLS gasket needs a liner protrusion of 0,075-0,1mm (0.003"-0.004"), but I have not seen any official MGR or LR documents stating this.

The KV6 is of a different design than the K4. It does not have the long through bolts for example and HGF is not common in the same way as for the K4`s, so not all of the same issues applies.

The KV6`s was factory fitted with a MLS gasket from the start, so these gaskets may look different than the typical K4 aftermarket MLS gasket.
Remember to replace the cylinder head bolts as these are of the stretch-to-yield type as commonly used on most engines.
I think the short head bolts gives a more stable clamping force of the cylinder head than the long bolts on the K4, making the KV6 more suitable for MLS gasket s than the K4.

I think you're right Einar the combination of a shorter head and block combined with the short head bolts give a vastly improved clamping force and less flexing therefore less gasket issues, however they can have issues with their liners but I have not come across this personally

Doc