KV6 lower inlet manifold gaskets. - Page 4

Typhoon190 · 31st January 2017, 20:52

Evening Simon.

Mayo under oil filler cap as before. Oil light does not extinguish immediately as it should. Oil level is slowly dropping, as it appears to be vaporising through the breather system and into the manifold.

All the issues I've had before, and thought I'd cured 6 months ago after yours and others assistance on this thread.

I clearly haven't managed to completely seal between the lower manifolds and the head.

SD1too · 1st February 2017, 22:32

Ben,

This is very puzzling isn't it. I have a persistent problem with leaking 'O' rings due to flattening, so I have replaced my inlet manifold gaskets many times (I don't use the keyhole method). I've used genuine MGR replacements and the manifold screws were tightened in sequence to the specified torque. They've been 100% reliable; no leaks, but my 'V' is constantly full of coolant!

There are other members who have no trouble at all. We have yet to crack this one.

Simon

kaiser · 2nd February 2017, 07:43

the mere fact that the gasket have been replaced so often is most likely the reason why you have not noticed a problem.
I will bet my bottom Dollar, (an American tautology again

) that you will have seepage in the seal. You just have not looked for it and not seen it.

I have however given a cure for the problem, after I have noticed it repeatedly.

And, strangely, I have sorted your other problem too. I have also explained to you why you continue to have these problems, but, as you know, not everyone rides the same day he saddles. (This time a Danish tautology! for a change!)

Let's end fittingly!!

https://www.youtube.com/watch?v=mYKWch_MNY0

Bolin · 5th February 2017, 23:11

Looking at those gaskets, I can't see any pink OAT going across them from the coolant hole to the inlet holes.

There is oiliness, maybe due to the breather set-up - my old gaskets had the oiliness and it seemed to be related to the grooves in the mating surface of the lower manifolds.

I reused an old inlet manifold gasket - it was fine until removed for other reasons, and lasted 4,000 miles/7 months after reuse. No issues.

Phil-T4 · 6th February 2017, 07:27

Quote:

Originally Posted by Typhoon190

Evening Simon.

Mayo under oil filler cap as before. Oil light does not extinguish immediately as it should. Oil level is slowly dropping, as it appears to be vaporising through the breather system and into the manifold.

All the issues I've had before, and thought I'd cured 6 months ago after yours and others assistance on this thread.

I clearly haven't managed to completely seal between the lower manifolds and the head.

So how can this be the inlet manifold gaskets?

If they were leaking it would be externally or into the combustion chamber which would be evident by the spark plug colour or a very clean piston crown.

If there is coolant in your oil is NOT getting there from the inlet manifold.

Typhoon190 · 6th February 2017, 20:20

Hi Phil.

The reason I feel that it's the inlet manifold gaskets is that I changed them again in July, after struggling over the past years with losing a small amount of coolant on a regular basis. Using Simon's advice on tightening sequence, the car's hardly lost any coolant until the last few weeks.

I'm thinking the coolant is getting into the engine, and contaminating the oil, hence the small amount of condensation / mayo under the oil filler.

genpk · 7th February 2017, 01:45

Quote:

Originally Posted by kaiser

the mere fact that the gasket have been replaced so often is most likely the reason why you have not noticed a problem.
I will bet my bottom Dollar, (an American tautology again

) that you will have seepage in the seal. You just have not looked for it and not seen it.

I have however given a cure for the problem, after I have noticed it repeatedly.

And, strangely, I have sorted your other problem too. I have also explained to you why you continue to have these problems, but, as you know, not everyone rides the same day he saddles. (This time a Danish tautology! for a change!)

Let's end fittingly!!

https://www.youtube.com/watch?v=mYKWch_MNY0

Hi Kaiser, you still doing those brilliant metal thermostat housings?
Put a bloke in a local Rover club in our southwest onto you as he is a new Rover 75 owner.
Re O ring failures,not had any leaks at all on both my cars fitted with your metal thermo housings since fitting.

Typhoon190 · 18th February 2017, 15:17

Can anyone verify the o ring size fitted the bottom of the thermostat housing for me please?

Is it OD33.0mm x 2.0 cross section?

Thanks in advance.

Typhoon190 · 20th February 2017, 19:55

Quote:

Originally Posted by Typhoon190

Can anyone verify the o ring size fitted the bottom of the thermostat housing for me please?

Is it OD33.0mm x 2.0 cross section?

Thanks in advance.

Bump. Anyone know the answer to this please?

SD1too · 21st February 2017, 08:02

Quote:

Originally Posted by Typhoon190

Bump. Anyone know the answer to this please?

CDU 3858 is 32.5 mm ID and 2.9 - 3.1 mm cross section.

Simon

1st February 2017, 22:32	#32
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,338 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Ben, This is very puzzling isn't it. I have a persistent problem with leaking 'O' rings due to flattening, so I have replaced my inlet manifold gaskets many times (I don't use the keyhole method). I've used genuine MGR replacements and the manifold screws were tightened in sequence to the specified torque. They've been 100% reliable; no leaks, but my 'V' is constantly full of coolant! There are other members who have no trouble at all. We have yet to crack this one. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

2nd February 2017, 07:43	#33
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	the mere fact that the gasket have been replaced so often is most likely the reason why you have not noticed a problem. I will bet my bottom Dollar, (an American tautology again) that you will have seepage in the seal. You just have not looked for it and not seen it. I have however given a cure for the problem, after I have noticed it repeatedly. And, strangely, I have sorted your other problem too. I have also explained to you why you continue to have these problems, but, as you know, not everyone rides the same day he saddles. (This time a Danish tautology! for a change!) Let's end fittingly!! https://www.youtube.com/watch?v=mYKWch_MNY0 __________________ Worth his V8 in gold

5th February 2017, 23:11	#34
Bolin This is my second home Rover 75 2.5 V6 Connoisseur SE 4dr manual Wedgewood Blue 2 04-05/06/2001 Join Date: Nov 2006 Location: N.E. Hampshire Posts: 4,617 Thanks: 289 Thanked 308 Times in 243 Posts	Looking at those gaskets, I can't see any pink OAT going across them from the coolant hole to the inlet holes. There is oiliness, maybe due to the breather set-up - my old gaskets had the oiliness and it seemed to be related to the grooves in the mating surface of the lower manifolds. I reused an old inlet manifold gasket - it was fine until removed for other reasons, and lasted 4,000 miles/7 months after reuse. No issues. __________________ "...the new Rover 75, which is a fabulous car......I think it looks fabulous....It's like sitting in a Rolls Royce......For me, this is the star of the show.....it looks so good" - J. Clarkson, motoring journalist on the launch of the Rover 75 in 1998.

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31st January 2017, 20:52	#31
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,704 Thanks: 328 Thanked 557 Times in 443 Posts	Evening Simon. Mayo under oil filler cap as before. Oil light does not extinguish immediately as it should. Oil level is slowly dropping, as it appears to be vaporising through the breather system and into the manifold. All the issues I've had before, and thought I'd cured 6 months ago after yours and others assistance on this thread. I clearly haven't managed to completely seal between the lower manifolds and the head.

6th February 2017, 20:20	#36
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,704 Thanks: 328 Thanked 557 Times in 443 Posts	Hi Phil. The reason I feel that it's the inlet manifold gaskets is that I changed them again in July, after struggling over the past years with losing a small amount of coolant on a regular basis. Using Simon's advice on tightening sequence, the car's hardly lost any coolant until the last few weeks. I'm thinking the coolant is getting into the engine, and contaminating the oil, hence the small amount of condensation / mayo under the oil filler.

18th February 2017, 15:17	#38
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,704 Thanks: 328 Thanked 557 Times in 443 Posts	Can anyone verify the o ring size fitted the bottom of the thermostat housing for me please? Is it OD33.0mm x 2.0 cross section? Thanks in advance.