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Old 29-04-2016, 18:35   #1
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Best grease for bronze seacocks?

Title says it all.. Looking for input and viewpoints on grease preferences for use in overhaul servicing and also for grease gun maintenance..

Fwiw I have Spartan marine seacocks.

Thx!
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Old 29-04-2016, 18:56   #2
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Re: Best grease for bronze seacocks?

I have used Volvo penta prop shaft grease on my bronze seacocks. 4 years and still moving easily.
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Old 29-04-2016, 18:59   #3
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Re: Best grease for bronze seacocks?

Spartan makes (and sells) their own grease and lapping compound. Maine Sail likes it. I used it on mine (after lapping) and a year later they are still smooth as butter. Can't go wrong.


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Old 29-04-2016, 19:06   #4
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Re: Best grease for bronze seacocks?

As to the best grease, I don't know but have been using Traveler Marine and Off Road grease for awhile on all four seacocks with no issues. Each seacock gets a couple of pumps when the boat is hauled in the fall (Upstate New York) and again about mid summer.
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Old 29-04-2016, 19:45   #5
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Re: Best grease for bronze seacocks?

Lanolin is waterproof and lasts a very long time. But in cold northern waters will make the seacock a bit harder to turn. I've use it for years.
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Old 29-04-2016, 19:55   #6
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Re: Best grease for bronze seacocks?

The internals of groco seacocks are a composite polymer like marelon (if not actual 'marelon'). Therefore we grease them with marelube on haul out and periodically work them while in the water.

Now, Groco through hulls come equipped with a drain plug. This drain plug can also be used to inject grease. So what you do is haul out (or not if you are fast!) and inject marelon into the through hull through the drain plug using a grease gun. Work the seacock open closed a few times, remove the grease gun and replug.
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Old 30-04-2016, 00:24   #7
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Re: Best grease for bronze seacocks?

I've been using whatever waterproof grease for about 50 years. I see the same seacocks, year after year, and it seems to do fine.
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Old 30-04-2016, 08:42   #8
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Re: Best grease for bronze seacocks?

Quote:
Originally Posted by Cheechako View Post
Lanolin is waterproof and lasts a very long time. But in cold northern waters will make the seacock a bit harder to turn. I've use it for years.
Cheekako nailed it. Specifically anhydrous lanolin. Lasts longer that any grease. I also use it on all stainless bolts and nuts as well as bronze. Removed some effortlessy last year after 10 years in place.
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Old 30-04-2016, 09:29   #9
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Re: Best grease for bronze seacocks?

Derailing this thread a little. Different recommendations for bronze turnbuckles?
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Old 30-04-2016, 09:45   #10
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Re: Best grease for bronze seacocks?

Anyone use White Lithium on their seacocks? As for many years, it was the go to item for winches, & most things bicycle, exposed to moisture.
And how about Never-Seize? Or is the Moly in it a no, no?


Regarding the turnbuckle question, Lancote should do the job for you.
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Old 30-04-2016, 09:50   #11
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Re: Best grease for bronze seacocks?

If they are Groco, with the rubber plug and T-handle lock, you don't want to use a petroleum based product, which destroys the rubber compound. For 20+ yrs I have used the silicone grease that divers use on their masks.
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Old 30-04-2016, 10:06   #12
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Re: Best grease for bronze seacocks?

Quote:
Originally Posted by UNCIVILIZED View Post
Anyone use White Lithium on their seacocks? As for many years, it was the go to item for winches, & most things bicycle, exposed to moisture.
And how about Never-Seize? Or is the Moly in it a no, no?


Regarding the turnbuckle question, Lancote should do the job for you.
I've used never seize in winches. Good stuff. It seems every time I tried White Lithium grease for something it just didn't hold up.
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Old 30-04-2016, 10:10   #13
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Re: Best grease for bronze seacocks?

I'm a believer in silicone grease, which you can get much cheaper at the plumbing department in Ace hardware.
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Old 30-04-2016, 10:56   #14
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Re: Best grease for bronze seacocks?

Quote:
Originally Posted by bailsout View Post
Derailing this thread a little. Different recommendations for bronze turnbuckles?
Lanolin for those as well. In my experimce is holds up better than grease in sun and salt spray
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Old 30-04-2016, 10:59   #15
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Re: Best grease for bronze seacocks?

I've used lanolin on the turnbuckle threads. If they are bronze on bronze they likely don't need much of anything IMO. I noticed that any excess lanolin extruded out after screwing together will get crusty and hard in the sun after months. But they came apart fine.
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