Re: 1990 Yamaha 3.0 L4

K

kingriggins

Recruit
Joined
Sep 26, 2012
Messages
2
Re: 1990 Yamaha 3.0 L4

I was curious as to identifying the thermostat. I need to replace mine and I'm having trouble identifying. Is there a part number available?
 
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triman

Petty Officer 2nd Class
Joined
Sep 30, 2002
Messages
124
Re: 1990 Yamaha 3.0 L4

Re: 1990 Yamaha 3.0 L4

With my 5.7, it's a standard mercruiser model.
 
K

kingriggins

Recruit
Joined
Sep 26, 2012
Messages
2
Re: 1990 Yamaha 3.0 L4

Re: 1990 Yamaha 3.0 L4

The thermostat part number is Sierra 18-3550 or Mercruiser 59078. I bought it off of ebay for $13.25. It's a 140 degree thermostat. Also for those searching for impellers, it's Jabsco 1210-0001 and Jabsco's website has a cross reference list. This is for the 3.0 L4 motor and yes the impeller is indeed on the front side of the motor and not inside the lower unit.
 
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