Water pump to block gasket - sealant or no?

[Poey50]

I'm going to fit a new raw water pump shortly. Should the gasket have sealant on or not? If so, what do you recommend? There is no manual that I know of to consult.

 

[Jcorstorphine]

I'm going to fit a new raw water pump shortly. Should the gasket have sealant on or not? If so, what do you recommend? There is no manual that I know of to consult.

If in doubt, I would use Hylomar Blue which is a thin non setting jointing compound. Smear thin layer on the gasket face and bolt up.

 

[RichardS]

If the joint faces are in good condition sealant should not be necessary and I would simply ensure that both sides of the gasket are well rubbed with engine grease before refitting.

If the joint faces are not good I would probably use an RTV silicone gasket sealant. This will seal perfectly on poor surfaces even without the proper gasket and is easy to remove if you ever need to access the pump again. However, Hylomar Blue will also do the trick in these circumstances.

Richard

 

[VicS]

I'm going to fit a new raw water pump shortly. Should the gasket have sealant on or not? If so, what do you recommend? There is no manual that I know of to consult.

Ensure both faces are clean and free of old gasket.

I'd then just us a smear of grease.

 

[VicS]

duplicate deelted

 

[Poey50]

Thanks to all.

 

[ex-Gladys]

I learnt a valuable lesson at the roadside with a petrol 2.25 Landy 90 that had just died on me. RAC man took carb apart to discover some muppet had rebuilt the carb with orange sealant as well as gaskets. When the carb was reassembled, excess sealant obviously squeezes out on the inside, and is available to block jets... Whilst a water pump is less critical than carb jets, I wouldn't want gobs of sealant trying to sneak through my heat exchanger...

 

[John the kiwi]

Plus 1 for Hylomar Blue - thin smear.
Less is more....

The original product was developed in conjunction with Rolls-Royce and was used for sealing aircraft engines. Hylomar continues to manufacture Rolls-Royce approved products for sealing aeronautical turbines.

Engine, compressor, electric motor, heavy industrial equipment, gearbox, defence industry component, turbine and many other original equipment manufacturers choose Hylomar non-setting compounds for their sealing and bonding applications.

Good enough for me!

RTV /silicones are the work of the devil and a sure sign of amateur intervention.
They cause as many problems as they fix in these applications.

 

[RichardS]

RTV /silicones are the work of the devil and a sure sign of amateur intervention.

Oh dear. That means that three of the production cars I have worked on this year must have been designed and built by amateurs as in four different classic gasket locations there is no gasket fitted at the factory. They use RTV Silicone and when you remove and refit the component you have to use RTV. There is no alternative. :encouragement:

Perhaps things are built differently down under?

Richard

 

[ghostlymoron]

Do what it says in the manual for your engine. I've never used anything apart from a bit of grease into hold it in place.

 

[Poey50]

Do what it says in the manual for your engine. I've never used anything apart from a bit of grease into hold it in place.

My (Nanni engine) manual is one of few words ... none of them about this. I've got enough to go on now thanks.

 

[PaulRainbow]

Ensure both faces are clean and free of old gasket.

I'd then just us a smear of grease.

+1

 

[Poey50]

+1

That's the plan.