Sierra 18-3556 Thermostat 130 Degree F for Chrysler/Force Outboards, Replaces F97068

The Sierra 18-3556 is a 130 degree F thermostat built for Chrysler/Force outboard cooling systems. It regulates coolant flow through the powerhead so the engine reaches and holds its correct operating temperature, which protects against overheating on one end and inefficient, overly cold running on the other. The thermostat measures 3/4 inch (19.1mm) and is constructed of metal for durability in a marine cooling environment.

Sierra manufactures this thermostat to meet or exceed the performance of the original equipment part it replaces, making it a straightforward drop-in replacement when a Chrysler/Force outboard thermostat has failed or is sticking open or closed. It fits a range of Chrysler/Force outboard horsepower ratings across multiple model years, and is also functionally interchangeable with several Chrysler/Force/US Marine, GLM, Mallory, and Mercury Marine part numbers, so it can be used as a cross-reference replacement regardless of which of those brands originally shipped on the engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3556
• Temperature Rating: 130 degrees F
• Size: 3/4 inch (19.1mm)
• Material: Metal
• Weight: 0.03 pounds
• UPC: 030999563002
• OEM Cross Reference: F97068, F97068-1, F97068-2, GLM 13200, Mallory 9-43025, Mercury Marine 895338

Fitment

• Chrysler/Force 25 HP, 1996-1998, Serial No. E127700-E344999
• Chrysler/Force 35 HP, 1976-1978
• Chrysler/Force 35 HP, 1983-1984
• Chrysler/Force 35 HP, 1986-1988
• Chrysler/Force 50 HP, 1984-91, 1992A

Replaces (OEM)

• F97068
• F97068-1
• F97068-2
• GLM 13200
• Mallory 9-43025
• Mercury Marine 895338

Frequently Asked Questions

What temperature is the Sierra 18-3556 thermostat rated for? The Sierra 18-3556 opens at 130 degrees F, which is the standard operating temperature setting for the Chrysler/Force outboard applications it fits.

What size is this thermostat? The 18-3556 measures 3/4 inch, also expressed as 19.1mm, which is the standard thermostat housing size for its listed Chrysler/Force outboard fitments.

Which Chrysler/Force outboards use the 18-3556 thermostat? It fits Chrysler/Force 25 HP outboards from 1996-1998 (serial range E127700-E344999), 35 HP outboards from 1976-1978, 1983-1984, and 1986-1988, and 50 HP outboards from 1984-91 and 1992A.

Is the 18-3556 a genuine OEM part or an aftermarket replacement? Sierra 18-3556 is manufactured by Sierra as a marine replacement part engineered to meet or exceed the performance of the original equipment thermostat it replaces.

What OEM part numbers does the 18-3556 cross-reference to? It is interchangeable with Chrysler/Force/US Marine F97068, F97068-1, and F97068-2, GLM 13200, Mallory 9-43025, and Mercury Marine 895338.

What material is the thermostat made from? The Sierra 18-3556 is constructed of metal, built to hold up to the heat cycling and marine environment of an outboard cooling system.

How much does the 18-3556 thermostat weigh? It weighs 0.03 pounds.

Will this thermostat work if my engine has an F97068 or Mercury Marine 895338 thermostat installed? Yes, the Sierra 18-3556 is functionally interchangeable with F97068, F97068-1, F97068-2, and Mercury Marine 895338, along with GLM 13200 and Mallory 9-43025.

Does the 18-3556 come with a gasket? The dossier for this listing covers the 18-3556 thermostat itself; no gasket or seal is specified as included.

What happens if I install a thermostat with the wrong temperature rating? Using a thermostat other than the specified 130 degree F rating for a Chrysler/Force outboard can cause the engine to run at an incorrect operating temperature, so the 18-3556's 130 degree F rating should be matched to the original spec for correct engine cooling.

Is the 18-3556 the correct thermostat for a 25 HP Chrysler/Force outboard? For a 25 HP Chrysler/Force outboard built in 1996-1998 within serial range E127700-E344999, the 18-3556 is the listed thermostat.

How do I know if the UPC matches this thermostat? The Sierra 18-3556 thermostat carries UPC 030999563002, which can be used to confirm it against the part in hand.