MAD SAVINGS! on over 15,000 items.
Shop the 7th Annual Boating Madness Sale

Vernatherm - 18-1506 - Sierra

Save 22% Off.
Vernatherm - 18-1506 - Sierra
Madness Sale Price: $15.29
Save: $4.40
(22% Off $19.69)
Part # 18-1506 ValueShip™ Eligible
This item is found in the following Product Families
Evinrude Vernatherms
    Evinrude Vernatherms
      Johnson / Evinrude / OMC 394411 replacement parts
        • 10/15 (1993-95)
        • 60/125/185 (1989-90)
        • 65 (1987-89)
        • 70/200/225 (1986-90)
        • 120/140/300 (1985-90)
        • 275 (1985-88)
        Applies for Johnson/Evinrude engines

        Replaces OEM part #
        • OMC 394411
        Average Customer Review for Vernatherm - 18-1506 - Sierra
        Full StarFull StarFull StarFull StarFull Star Based On 2 Reviews | Write Review
        Full StarFull StarFull StarFull StarFull Starworks as intended
        by Chris from Sarasota, Florida on June 03, 2014
        rather than replace the whole thermostat assembly, 99% of the time th eissue is the vernatherm. While they rarely go bad, the metal can corrode making the piston unable to move. how it works: looking at the picture of the unit, you have a pin at the far left, that rests on top of a piston. The piston has a limited amount of travel, maybe 1/4 inch. When cold the pin is pushed against the piston by a spring that is part of the thermostat assembly. inside the vernatherm is probably paraffin, when cold it allows the piston to collapse. When hot, the paraffin expands which pushes out the piston , which in turn pushes out the pin. When the pin is pushed all the way out the big bulbous portion of the vernatherm is not longer sealing the water ports of the thermostate assembly allowing water to enter the cylinder head. I was able to fix my old ones by pulling the pin out with some force and wet sanding the pin so it moved freely. But I put these way as spares. Every season , pull the assemblies apart and test the pin and test the vernatherms in a pot of hot water.
        (0 of 1 people found this review helpful)
        Was this review helpful?
        Full StarFull StarFull StarFull StarFull Starworks as stated
        by Jeffrey from Charlotte, North Carolina on June 06, 2011
        uses original t-stat housing
        (3 of 6 people found this review helpful)
        Was this review helpful?
        Ask a question for
        Question & Answer Guidelines
        This product ships in 1 business day.

        Add to Cart and enter your Postal Code to determine the shipping charges and estimated delivery date.
        * Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
        Standard Shipping Policies
        Do you need Professional Installation? has teamed with a national network of independent installers that are ready to handle your installation needs.
        Find your local Amtech dealer:
        CRAZY SAVINGS! Now's the time to Grab New Gear - Pocket More Savings.