KV6 lower inlet manifold gaskets. - Page 3

Typhoon190 · 5th May 2016, 22:31

I did clean the mating faces carefully, but tightened all bolts gradually. I'll try the inner to outer this time. Thanks Simon.

Will keep this updated, with good news hopefully.

Typhoon190 · 6th May 2016, 08:01

I'm hoping to source a replacement O ring for the thermostat housing today.

Having encountered problems before with the clutch master cylinder o rings, I have been trying to find an answer as to which material to use.

The second paragraph under "avoid machine damage", states OAT will react with PVC, rubber, and Viton.

http://www.miller-bradford.com/serv_tips_oat.html

SD1too · 6th May 2016, 08:03

Please let us know how you get on. Inlet manifold gasket trouble is not very common on the KV6 so fingers crossed.

Simon

kaiser · 6th May 2016, 08:07

Viton (for O-rings) is a good choice. About 4 times the price of butyl. Butyl is resistant to normal engine chemicals, but seems to suffer from age related cracks.
Viton does not.

And, I would ditch the OAT in favour of conventional good quality anti freeze.

As for the gasket material, look at Valemoid and Klingerite.

Typhoon190 · 6th May 2016, 08:08

Link added above.

SD1too · 6th May 2016, 08:08

Quote:

Originally Posted by Typhoon190

I'm hoping to source a replacement O ring for the thermostat housing today ... I have been trying to find an answer as to which material to use.

I've been down that route Ben, without success. Last time I obtained EPDM 'O' rings from an independent supplier but the leakage occurred in exactly the same place.

The MGR 'O' rings are available separately.

Quote:

The second paragraph under "avoid machine damage", states OAT will react with PVC, rubber, and Viton.

Where did you find this, and what evidence is offered? None, I suspect.
There are many V6s around with OAT and no 'O' ring trouble which suggests that the antifreeze isn't the reason.
The MGR 'O' rings are made from none of those materials anyway.

Simon

Typhoon190 · 11th July 2016, 21:40

Just an update on this, and a thank you for all the advice.

Coolant level is stable, and has been since the replacement inlet manifold gaskets were fitted, using the method that Simon advised. I'm surprised that it appears to be the tightening sequence that may have caused me so many problems.

Simon's diagnosis on the thermostat o rings was also correct.

I think perhaps a quad ring would be the way forward, but haven't been able to source the correct size and material as yet.

Thanks again to all.

Ben.

Typhoon190 · 30th January 2017, 21:10

Losing coolant into the engine again.

Not happy. Really wish there was a better option for replacement gaskets.

There is not enough of a seal between the coolant ways and the cylinder ports. If I had to choose, I'd prefer the coolant leaked out rather than into the engine.

kaiser · 31st January 2017, 05:11

Bad design, bad materials.
I did the following. Took silver paint, like you use for normal gates.
Gave the gaskets two or three coats, let it dry for a day, bolted together.
No problems.

This is an old trick used when you had to re-use gaskets, and it has worked for many, including me.

So, just give the incompetent designers at Rover and BMW a helping hand, they need it!

SD1too · 31st January 2017, 20:47

Quote:

Originally Posted by Typhoon190

Losing coolant into the engine again.

What makes you so sure that it's into the engine?

Simon

6th May 2016, 08:01	#22
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	I'm hoping to source a replacement O ring for the thermostat housing today. Having encountered problems before with the clutch master cylinder o rings, I have been trying to find an answer as to which material to use. The second paragraph under "avoid machine damage", states OAT will react with PVC, rubber, and Viton. http://www.miller-bradford.com/serv_tips_oat.html Last edited by Typhoon190; 6th May 2016 at 08:07..

6th May 2016, 08:03	#23
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: 20,375 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Please let us know how you get on. Inlet manifold gasket trouble is not very common on the KV6 so fingers crossed. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

6th May 2016, 08:07	#24
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	Viton (for O-rings) is a good choice. About 4 times the price of butyl. Butyl is resistant to normal engine chemicals, but seems to suffer from age related cracks. Viton does not. And, I would ditch the OAT in favour of conventional good quality anti freeze. As for the gasket material, look at Valemoid and Klingerite. __________________ Worth his V8 in gold

31st January 2017, 05:11	#29
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	Bad design, bad materials. I did the following. Took silver paint, like you use for normal gates. Gave the gaskets two or three coats, let it dry for a day, bolted together. No problems. This is an old trick used when you had to re-use gaskets, and it has worked for many, including me. So, just give the incompetent designers at Rover and BMW a helping hand, they need it! __________________ Worth his V8 in gold

5th May 2016, 22:31	#21
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	I did clean the mating faces carefully, but tightened all bolts gradually. I'll try the inner to outer this time. Thanks Simon. Will keep this updated, with good news hopefully.

6th May 2016, 08:08	#25
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	Link added above.

11th July 2016, 21:40	#27
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	Just an update on this, and a thank you for all the advice. Coolant level is stable, and has been since the replacement inlet manifold gaskets were fitted, using the method that Simon advised. I'm surprised that it appears to be the tightening sequence that may have caused me so many problems. Simon's diagnosis on the thermostat o rings was also correct. I think perhaps a quad ring would be the way forward, but haven't been able to source the correct size and material as yet. Thanks again to all. Ben.

30th January 2017, 21:10	#28
Typhoon190 This is my second home MG ZT-T 190 Monogram Typhoon Join Date: Jan 2009 Location: Oxfordshire Posts: 4,707 Thanks: 328 Thanked 557 Times in 443 Posts	Losing coolant into the engine again. Not happy. Really wish there was a better option for replacement gaskets. There is not enough of a seal between the coolant ways and the cylinder ports. If I had to choose, I'd prefer the coolant leaked out rather than into the engine.