Lancia Beta Forum

Technical stuff => Heating/Cooling => Topic started by: mangocrazy on January 28, 2021, 07:39:08 PM

Title: Water pump to rear coolant rail interface
Post by: mangocrazy on January 28, 2021, 07:39:08 PM

Simple question - does the o-ring suffice or should one also use a gasket? If it's the latter I'll probably have to resort to making one, as I don't appear to have one in my full engine set...

Title: Re: Water pump to rear coolant rail interface
Post by: WestonE on January 29, 2021, 09:48:13 AM

Hi Graham

I made a gasket. I was not prepared to trust the o ring alone.

Eric

Title: Re: Water pump to rear coolant rail interface
Post by: mangocrazy on January 29, 2021, 01:59:12 PM

Thanks Eric. I'll do the same.

Title: Re: Water pump to rear coolant rail interface
Post by: squiglyzigly on January 29, 2021, 03:23:37 PM

It’s worth checking the flatness of the flange. They can bow a bit hence the leaks. I always run a flat stone over the flange to true it up.

Ian

Title: Re: Water pump to rear coolant rail interface
Post by: mangocrazy on January 29, 2021, 03:56:54 PM

Quote from: squiglyzigly on January 29, 2021, 03:23:37 PM

It’s worth checking the flatness of the flange. They can bow a bit hence the leaks. I always run a flat stone over the flange to true it up.

Ian

Good point. I'll do that when I'm next in the proximity of the part in question.

Cheers,

Graham

Title: Re: Water pump to rear coolant rail interface
Post by: Ferrit on January 24, 2026, 03:37:43 PM

I was wondering all this.  I did find what looks the same but a gasket on other twin-cam models

https://www.aecar.co.uk/products/gasket-water-pump-to-pipe-lancia-delta-integrale-evolution-5999294?variant=1776666945

I will check for flatness also.  do I use the o-ring and gasket, or is that silly?  Do I use other products like wellseal on the gasket?

M

Title: Re: Water pump to rear coolant rail interface
Post by: Ics19 on January 24, 2026, 11:54:00 PM

Quote from: Ferrit on January 24, 2026, 03:37:43 PM

I did find what looks the same but a gasket on other twin-cam models

The Delta is a different pump and symmetrical gasket - you need the stock Montecarlo gasket which is offset and never in the kits:
https://www.eurosport-uk.net/shop/index.php?main_page=product_info&cPath=24_26&products_id=959

The gasket works well on the monte with a spray coat of blue Hylomar, it didn't have the O-ring on its flange  (y)

Title: Re: Water pump to rear coolant rail interface
Post by: Nigel on January 25, 2026, 11:53:16 AM

Mine is holding up with just the O ring and a generous
dollop of blue Hylomar. I may have used a slightly fatter ring.

Mark, if this is a new after-market rail, check that the flange is orientated
correctly in relation to the mount at the other end. 

Nigel

Title: Re: Water pump to rear coolant rail interface
Post by: Ferrit on January 25, 2026, 06:10:20 PM

I am going to use the original I am pretty sure OEM bottom rail as the stainless one is not quite the right dims.  Top aftermarket stainless steel one looks good and has the mod for the coolant in and out from the back of the head.  I make a call on o-ring or gasket later this week.  It had a o-ring one fitted and wasnt leaking.  Mind you I now have a new pump fitted so that will sure make it leak  :P

Thanks for advice as per :-)